Lehnberg
Transcript By: Bryan Bishop
Category: Conference
daniel/lehberg
Mimblewimble pros and cons
There are no amounts, no addresses, and improved scaling. But one of hte problems is that it requires interactive transactions. But this is a pro because of this you have to participate in mining. You can send money to addresses without having to accept the money. Just as you saw here, you can identify the blue box as an output or an input. You could build up a transaction graph. There are some attacks that are possible.
I think Andrew is going tobe talking about scriptless scripts later today.
Project history
- Announced 2016-10-20 by “Ignotus Peverell”. It was the first mimblewimble implementation. It’s written in rust. It’s open-source, community driven, funded by donations. There’s no ICO, CEO, advisors, investors, founders, premines, pre-ASICs, no pre-anything. The goal was to make something fair.
Why bother?
We felt that mimblewimble’s technology was worth experimenting with. It wasn’t possible to do it as well with bitcoin or a sidechain. Sidechains were still a theoretical or mythical beast.
Some mimblewimble-native concepts are impossible in bitcoin. And mimblewimble can move faster and implement state-of-the-art techniques that bitcoin can’t push as quickly.
Whether it works or not or whether it proves to be good, that remains to be seen.
Words I use to describe the project
I describe the grin project as open, fair in the sense of how it was launched and how it is run. It’s honest because you can be honest because you have no incentives to not be honest. It’s minimal, we tried to do absolutely the– keep the protocol level as small as possible which is quite tricky. It’s rational in that we try to rely on scientific principles for the way wre work… and it’s transparent.
Governance
What counts as a governance model?
One way to summarize our thoughts on this is that governance is really hard. It’s definitely a human problem. It’s a political problem. There is no grin foundation. There’s a technocratic council. We try to do the least harm as possible. We try to keep it as simple as possible. Decisions are taken in the open bi-weekly development and governance meetings where possible.
We still encourage anyone to create a new foundation if they want. There’s no “grin” foundation though.
We are constantly second guessing ourselves about the council and its role. We try to take all of the meetings in the open. We do it every Tuesday. Anyone can join and participate in that. It’s working right now. We don’t know how long it will continue to work.
Technologies used
- Schnorr signatures give us smaller signatures and scriptless scripts.
Bulletproofs give us smaller range proofs, required for confidential transactions. We use rangeproofs to prove there’s not a negative amount.
Scriptless scripts- Andrew is going to talk about this later today. It enables atomic swaps in grin and some other scripting behavior.
Dandelion too, it’s a privacy-preserivng transaction propogation and aggregation. It helps obfuscate where transactions came from.
Future areas of research (maybe)
Flyclient- a lite client for grin.
Lightning network is possible.
Confidential assets is possible.
We’ve been thinking about universal accumulators.
We’ve been thinking about BLS signatures.
Emission schedule
It’s 1 grin/second, forever. It’s realized through proof-of-work. It has one-minute bock time. It’s 60 grin constant coinbase reward. It’s simple, and it’s fair. It douscrages an unfair advantage for early adopters. There’s nothing for us to gain from that. Anybody can join, they don’t need to be there first to get a headstart advantage, since they can get the headstart advantage later.
Cuckoo cycle family
We start with a hash table with a lot of nodes, in the billions. You want to clear those up so that you can end up with a cycle or a loop. This is the high-level summaryz of John Tromp’s cuckoo cycle proof-of-work.
We have two variants. One is for GPUs and the other is for ASICs. The GPU one is CuckARoo29 and the ASIC algorithm is CuckAToo31+. We’re looking to migrate away from the GPU proof-of-work and to an ASIC-hardened proof-of-work.
It’s quite hard to bootstrap a fair network in 2019. We don’t want ASIC manufacturers to have an early advantage. So it starts off at 10% at first and then linearly increases over time.
Current status
Grin launched 10 days ago. Fairly smooth. Yeah. Business as usual after that.
What’s in the box?
There’s a node, a mining protocol, a wallet with basic commands. You can use keybase. There’s minin gsoftware for nvidia and AMD GPUs for both algorithms.
What’s next?
A lot of this depends on quality of life, security, stability, performance, improving documentation and nurturing the ecosystem. The design being minimal means we expect a lot of the end user solutions to come from other people rather than the core project. The project is very minimal.
Exchange integrations
We don’t do applications. We don’t do NDAs. There’s no legal entity. We don’t pay listing fees, we’re broke. We do try to be helpful, and we do welcome integrations, and contributions to the dev fund.
Exchanges have begun to show interest and every once in a while they announce support. It seems to be working okay.
Selected community projects
https://github.com/grinplusplus/grinplusplus
grin-pool.org
grinscan.net and grinexplorer
https://tmgox.com/ sells swag and all the profits from this go directly to the developer fund.d
grinnews.substack.com is a weekly newsletter. It summarizes development news each week.
Contributing
If you want to contribute, as hashmap says, “just do it”. We need rust developers, researchers, frontend developers, grpahic designers, UI/UX specialists, technical writers, and community memnbers in general to help us test and improve our governance.
Get involved
Don’t ask for permission, just do it. Be excessively police and nice. I think that’s a good rule when we try to apply this in general in the public.
Fund yeastplume
He would like to work full time on Grin from March - Aug 2019. His goal is to raise about $55,000 euros. This is a good way to protect your grin investment. The best way to do this is to help fund developers.
Take a technical crash course
There was a last conference in Berlin. There’s some slides available on grincon.org look it up.
Value proposition
Grin is not perfectly private, yet. But it does the job quite well. Privacy is turned on by default, and can only selectively be turned off. Being community driven is a core strength, not a weakness. We really want the community to protect the council. People expect there’s a developer company building this. But me as a community member are just a consumer, a user. We want everyone to contribute and help grow the community. And the fact that we had a fair launch and emission schedule aligns our interests and protect integrity. It’s easy for us to stand up and say we’re not perfectly private. It keeps us all honest and self-selects people who want to get involved because it’s not an immediate way to have a financial gain from this.
Q&A
Q: Will the presentation be posted?
A: There’s a place we keep our meeting notes and presentations.
Thank you daniel.


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SysPropertiesThe constants defined in this class are initialized from system properties. Some system properties are per machine settings, and others are as a last resort and temporary solution to work around a problem in the application or database engine. Also, there are system properties to enable features that are not yet fully tested or that are not backward compatible.System properties can be set when starting the virtual machine: java -Dh2.baseDir=/tempThey can be set within the application, but this must be done before loading any classes of this database (before loading the JDBC driver): System.setProperty("h2.baseDir", "/temp");
ALIAS_COLUMN_NAMESystem property
h2.aliasColumnName (default: false).When enabled, aliased columns (as in SELECT ID AS I FROM TEST) return the alias (I in this case) in ResultSetMetaData.getColumnName() and 'null' in getTableName(). If disabled, the real column name (ID in this case) and table name is returned. This setting only affects the default mode. When using different modes, this feature is disabled for compatibility for all databases except MySQL. For MySQL, it is always enabled. ALLOWED_CLASSESSystem property
h2.allowedClasses (default: *).Comma separated list of class names or prefixes. ALLOW_BIG_DECIMAL_EXTENSIONSSystem property
h2.allowBigDecimalExtensions (default:
false).When enabled, classes that extend BigDecimal are supported in PreparedStatement.setBigDecimal. ANALYZE_AUTOSystem property
h2.analyzeAuto (default: 0).After changing this many rows, ANALYZE is automatically run for a table. Automatically running ANALYZE is disabled if set to 0. If set to 1000, then ANALYZE will run against each user table after about 1000 changes to that table. The time between running ANALYZE doubles each time since starting the database. It is not run on local temporary tables, and tables that have a trigger on SELECT. ANALYZE_SAMPLESystem property
h2.analyzeSample (default: 10000).The default sample size when analyzing a table. BIND_ADDRESSSystem property
h2.bindAddress (default: null).Comma separated list of class names or prefixes. BROWSERSystem property
h2.browser (default: null).The preferred browser to use. If not set, the default browser is used. For Windows, to use the Internet Explorer, set this property to 'explorer'. For Mac OS, if the default browser is not Safari and you want to use Safari, use: java -Dh2.browser="open,-a,Safari,%url" ... .CACHE_SIZE_DEFAULTSystem property
h2.cacheSizeDefault (default: 16384).The default cache size in KB. CACHE_TYPE_DEFAULTSystem property
h2.cacheTypeDefault (default: LRU).How many time the cache size value is divided by two to get the index cache size. The index cache size is calculated like this: cacheSize >> cacheSizeIndexShift. CHECKSystem property
h2.check (default: true).Assertions in the database engine. CHECK2System property
h2.check2 (default: true).Additional assertions in the database engine. CLIENT_TRACE_DIRECTORYSystem property
h2.clientTraceDirectory (default:
trace.db/).Directory where the trace files of the JDBC client are stored (only for client / server). CONSOLE_STREAMSystem property
h2.consoleStream (default: true).H2 Console: stream query results. DATASOURCE_TRACE_LEVELSystem property
h2.dataSourceTraceLevel (default: 1).The trace level of the data source implementation. Default is 1 for error. DEFAULT_ESCAPESystem property
h2.defaultEscape (default: \).The default escape character for LIKE comparisons. To select no escape character, use an empty string. DEFAULT_LOCK_MODESystem property
h2.defaultLockMode (default: 3).The default value for the LOCK_MODE setting. DEFAULT_MAX_LENGTH_INPLACE_LOBSystem property
h2.defaultMaxLengthInplaceLob
(default: 4096).The default maximum length of an LOB that is stored in the database file. DEFAULT_MAX_LENGTH_INPLACE_LOB2System property
h2.defaultMaxLengthInplaceLob2
(default: 128).The default maximum length of an LOB that is stored with the record itself. Only used if h2.lobInDatabase is enabled. DEFAULT_MAX_MEMORY_UNDOSystem property
h2.defaultMaxMemoryUndo (default: 50000).The default value for the MAX_MEMORY_UNDO setting. DEFAULT_MAX_OPERATION_MEMORYSystem property
h2.defaultMaxOperationMemory (default:
100000).The default for the setting MAX_OPERATION_MEMORY. DEFAULT_RESULT_SET_CONCURRENCYSystem property
h2.defaultResultSetConcurrency (default:
ResultSet.CONCUR_READ_ONLY).The default result set concurrency for statements created with Connection.createStatement() or prepareStatement(String sql). DELAY_WRONG_PASSWORD_MAXSystem property
h2.delayWrongPasswordMax (default: 4000).The maximum delay in milliseconds before an exception is thrown for using the wrong user name or password. This slows down brute force attacks. The delay is reset after a successful login. The value 0 means there is no maximum delay. DELAY_WRONG_PASSWORD_MINSystem property
h2.delayWrongPasswordMin (default: 250).The minimum delay in milliseconds before an exception is thrown for using the wrong user name or password. This slows down brute force attacks. The delay is reset to this value after a successful login. Unsuccessful logins will double the time until DELAY_WRONG_PASSWORD_MAX. To disable the delay, set this system property to 0. ENABLE_ANONYMOUS_SSLSystem property
h2.enableAnonymousSSL (default: true).When using SSL connection, the anonymous cipher suite SSL_DH_anon_WITH_RC4_128_MD5 should be enabled. ESTIMATED_FUNCTION_TABLE_ROWSSystem property
h2.estimatedFunctionTableRows (default:
1000).The estimated number of rows in a function table (for example, CSVREAD or FTL_SEARCH). This value is used by the optimizer. FILE_ENCODINGSystem property
file.encoding (default: Cp1252).It is usually set by the system and is the default encoding used for the RunScript and CSV tool. FILE_SEPARATORSystem property
file.separator (default: /).It is usually set by the system, and used to build absolute file names. FUNCTIONS_IN_SCHEMASystem property
h2.functionsInSchema (default:
false).If set, all functions are stored in a schema. Specially, the SCRIPT statement will always include the schema name in the CREATE ALIAS statement. This is not backward compatible with H2 versions 1.2.134 and older. IDENTIFIERS_TO_UPPERSystem property
h2.identifiersToUpper (default: true).Unquoted identifiers in SQL statements are case insensitive and converted to uppercase. JAVA_SPECIFICATION_VERSIONSystem property
java.specification.version .It is set by the system. Examples: 1.4, 1.5, 1.6. LARGE_RESULT_BUFFER_SIZESystem property
h2.largeResultBufferSize (default: 4096).Buffer size for large result sets. Set this value to 0 to disable the buffer. LARGE_TRANSACTIONSSystem property
h2.largeTransactions (default: false).Support very large transactions LINE_SEPARATORSystem property
line.separator (default: \n).It is usually set by the system, and used by the script and trace tools. LOB_FILES_PER_DIRECTORYSystem property
h2.lobFilesPerDirectory (default: 256).Maximum number of LOB files per directory. LOB_IN_DATABASESystem property
h2.lobInDatabase (default: false).Store LOB files in the database. LOG_ALL_ERRORSSystem property
h2.logAllErrors (default: false).Write stack traces of any kind of error to a file. LOG_ALL_ERRORS_FILESystem property
h2.logAllErrorsFile (default:
h2errors.txt).File name to log errors. MAX_COMPACT_COUNTSystem property
h2.maxCompactCount
(default: Integer.MAX_VALUE).The maximum number of pages to move when closing a database. MAX_COMPACT_TIMESystem property
h2.maxCompactTime (default: 1000).The maximum time in milliseconds used to compact a database when closing. MAX_FILE_RETRYSystem property
h2.maxFileRetry (default: 16).Number of times to retry file delete and rename. in Windows, files can't be deleted if they are open. Waiting a bit can help (sometimes the Windows Explorer opens the files for a short time) may help. Sometimes, running garbage collection may close files if the user forgot to call Connection.close() or InputStream.close(). MAX_MEMORY_ROWS_DISTINCTSystem property
h2.maxMemoryRowsDistinct (default:
Integer.MAX_VALUE).The maximum number of rows kept in-memory for SELECT DISTINCT queries. If more than this number of rows are in a result set, a temporary table is used. MAX_RECONNECTSystem property
h2.maxReconnect (default: 3).The maximum number of tries to reconnect in a row. MAX_TRACE_DATA_LENGTHSystem property
h2.maxTraceDataLength (default: 65535).The maximum size of a LOB value that is written as data to the trace system. MIN_COLUMN_NAME_MAPSystem property
h2.minColumnNameMap (default: 3).The minimum number of columns where a hash table is created when result set methods with column name (instead of column index) parameter are called. MIN_WRITE_DELAYSystem property
h2.minWriteDelay (default: 5).The minimum write delay that causes commits to be delayed. NIO_CLEANER_HACKSystem property
h2.nioCleanerHack (default: true).If possible, use a hack to un-map the mapped file. See also http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=4724038 NIO_LOAD_MAPPEDSystem property
h2.nioLoadMapped (default: false).If the mapped buffer should be loaded when the file is opened. This can improve performance. OBJECT_CACHESystem property
h2.objectCache (default: true).Cache commonly used objects (integers, strings). OBJECT_CACHE_MAX_PER_ELEMENT_SIZESystem property
h2.objectCacheMaxPerElementSize (default:
4096).Maximum size of an object in the cache. OBJECT_CACHE_SIZESystem property
h2.objectCacheSize (default: 1024).Maximum size of an object in the cache. This value must be a power of 2. OPTIMIZE_DISTINCTSystem property
h2.optimizeDistinct (default: true).Improve the performance of simple DISTINCT queries if an index is available for the given column. The optimization is used if:
OPTIMIZE_EVALUATABLE_SUBQUERIESSystem property
h2.optimizeEvaluatableSubqueries (default:
true).Optimize subqueries that are not dependent on the outer query. OPTIMIZE_IN_LISTSystem property
h2.optimizeInList (default: true).Optimize IN(...) and IN(SELECT ...) comparisons. This includes optimization for SELECT, DELETE, and UPDATE. OPTIMIZE_IS_NULLSystem property
h2.optimizeIsNull (default: false).Use an index for condition of the form columnName IS NULL. OPTIMIZE_ORSystem property
h2.optimizeOr (default: false).Convert (C=? OR C=?) to (C IN(?, ?)). OPTIMIZE_SUBQUERY_CACHESystem property
h2.optimizeSubqueryCache (default: true).Cache subquery results. OPTIMIZE_TWO_EQUALSSystem property
h2.optimizeTwoEquals (default: true).Optimize expressions of the form A=B AND B=1. In this case, AND A=1 is added so an index on A can be used. PAGE_SIZESystem property
h2.pageSize (default: 2048).The page size to use for new databases. PAGE_STORE_INTERNAL_COUNTSystem property
h2.pageStoreInternalCount (default: false).Update the row counts on a node level. PAGE_STORE_TRIMSystem property
h2.pageStoreTrim (default: true).Trim the database size when closing. PG_DEFAULT_CLIENT_ENCODINGSystem property
h2.pgClientEncoding (default: UTF-8).Default client encoding for PG server. It is used if the client does not sends his encoding. PREFIX_TEMP_FILESystem property
h2.prefixTempFile (default: h2.temp).The prefix for temporary files in the temp directory. RECOMPILE_ALWAYSSystem property
h2.recompileAlways (default: false).Always recompile prepared statements. RECONNECT_CHECK_DELAYSystem property
h2.reconnectCheckDelay (default: 200).Check the .lock.db file every this many milliseconds to detect that the database was changed. The process writing to the database must first notify a change in the .lock.db file, then wait twice this many milliseconds before updating the database. REDO_BUFFER_SIZESystem property
h2.redoBufferSize (default: 262144).Size of the redo buffer (used at startup when recovering). RESERVE_MEMORYSystem property
h2.reserveMemory (default: 524288).This many bytes in main memory are allocated as a reserve. This reserve is freed up when if no memory is available, so that rolling back a large transaction is easier. RETURN_LOB_OBJECTSSystem property
h2.returnLobObjects (default: true).When true, ResultSet.getObject for CLOB or BLOB will return a java.sql.Clob / java.sql.Blob object. When set to false, it will return a java.io.Reader / java.io.InputStream. SELECT_FOR_UPDATE_MVCCSystem property
h2.selectForUpdateMvcc (default: false).If set, SELECT .. FOR UPDATE queries lock the rows when using MVCC. SERVER_CACHED_OBJECTSSystem property
h2.serverCachedObjects (default: 64).TCP Server: number of cached objects per session. SERVER_RESULT_SET_FETCH_SIZESystem property
h2.serverResultSetFetchSize
(default: 100).The default result set fetch size when using the server mode. SHARE_LINKED_CONNECTIONSSystem property
h2.shareLinkedConnections
(default: true).Linked connections should be shared, that means connections to the same database should be used for all linked tables that connect to the same database. SOCKET_CONNECT_RETRYSystem property
h2.socketConnectRetry (default: 16).The number of times to retry opening a socket. Windows sometimes fails to open a socket, see bug http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=6213296 SOCKET_CONNECT_TIMEOUTSystem property
h2.socketConnectTimeout (default: 2000).The timeout in milliseconds to connect to a server. SORT_NULLS_HIGHSystem property
h2.sortNullsHigh (default: false).Invert the default sorting behavior for NULL values, such that NULL values are sorted to the end of a result set in an ascending sort and to the beginning of a result set in a descending sort. SPLIT_FILE_SIZE_SHIFTSystem property
h2.splitFileSizeShift (default: 30).The maximum file size of a split file is 1L << x. SYNC_METHODSystem property
h2.syncMethod (default: sync).What method to call when closing the database, on checkpoint, and on CHECKPOINT SYNC. The following options are supported: "sync" (default): RandomAccessFile.getFD().sync(); "force": RandomAccessFile.getChannel().force(true); "forceFalse": RandomAccessFile.getChannel().force(false); "": do not call a method (fast but there is a risk of data loss on power failure). TRACE_IOSystem property
h2.traceIO (default: false).Trace all I/O operations. USER_HOMESystem property
user.home (empty string if not set).It is usually set by the system, and used as a replacement for ~ in file names. WEB_MAX_VALUE_LENGTHSystem property
h2.webMaxValueLength (default: 100000).The H2 Console will abbreviate (truncate) result values larger than this size. The data in the database is not truncated, it is only to avoid out of memory in the H2 Console application. lobCloseBetweenReadsSystem property
h2.lobCloseBetweenReads (default: false).Close LOB files between read operations. runFinalizeSystem property
h2.runFinalize (default: true).Run finalizers to detect unclosed connections. |


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Uses of Class
net.sf.jasperreports.engine.base.JRBaseObjectFactory
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Packages that use JRBaseObjectFactory Package Description net.sf.jasperreports.charts.base Contains base implementations for chart related interfaces.net.sf.jasperreports.charts.util Contains utility classes for complex chart customization.net.sf.jasperreports.components.barbecue Contains classes for the built-in Barbecue component.net.sf.jasperreports.components.barcode4j Contains classes for the built-in Barcode4J component.net.sf.jasperreports.components.iconlabel Contains classes for the built-in Icon Label component.net.sf.jasperreports.components.items Contains classes and interfaces for the item based components.net.sf.jasperreports.components.list Contains classes for the built-in List component.net.sf.jasperreports.components.map Contains classes for the built-in Google Map component.net.sf.jasperreports.components.sort Contains classes for the built-in Sort component.net.sf.jasperreports.components.spiderchart Contains classes for the built-in Spider Chart component.net.sf.jasperreports.components.table Contains classes for the built-in Table component.net.sf.jasperreports.components.table.fill Contains fill time implementations for Table component related interfaces.net.sf.jasperreports.crosstabs.base Contains base classes for the Crosstab report element.net.sf.jasperreports.engine Provides access to the library's main functionality through facade classes for compiling, filling and exporting reports and also publishes the library's main interfaces and classes.net.sf.jasperreports.engine.analytics.dataset net.sf.jasperreports.engine.base Contains base implementations for the library's main interfaces.net.sf.jasperreports.engine.component Provides interfaces and base classes for the built-in JasperReports component functionality.net.sf.jasperreports.engine.design Contains design time implementations for the library's main interfaces as well as report compiling tools.net.sf.jasperreports.engine.part net.sf.jasperreports.parts.subreport -
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Uses of JRBaseObjectFactory in net.sf.jasperreports.charts.base
Constructors in net.sf.jasperreports.charts.base with parameters of type JRBaseObjectFactory Constructor Description JRBaseAreaPlot(JRAreaPlot areaPlot, JRBaseObjectFactory factory)
JRBaseBar3DPlot(JRBar3DPlot barPlot, JRBaseObjectFactory factory)
JRBaseBarPlot(JRBarPlot barPlot, JRBaseObjectFactory factory)
JRBaseBubblePlot(JRBubblePlot bubblePlot, JRBaseObjectFactory factory)
JRBaseCandlestickPlot(JRCandlestickPlot candlestickPlot, JRBaseObjectFactory factory)
JRBaseCategoryDataset(JRCategoryDataset dataset, JRBaseObjectFactory factory)
JRBaseCategorySeries(JRCategorySeries categorySeries, JRBaseObjectFactory factory)
JRBaseChartAxis(JRChartAxis axis, JRBaseObjectFactory factory)
JRBaseDataRange(JRDataRange dataRange, JRBaseObjectFactory factory)
Creates a copy of an existing range and registers all of the expressions with a factory object.JRBaseGanttDataset(JRGanttDataset dataset, JRBaseObjectFactory factory)
JRBaseGanttSeries(JRGanttSeries ganttSeries, JRBaseObjectFactory factory)
JRBaseHighLowDataset(JRHighLowDataset dataset, JRBaseObjectFactory factory)
JRBaseHighLowPlot(JRHighLowPlot highLowPlot, JRBaseObjectFactory factory)
JRBaseItemLabel(JRItemLabel itemLabel, JRBaseObjectFactory factory)
Constructs a copy of an existing item label specification and registers any expression in the new copy with the specified factory.JRBaseLinePlot(JRLinePlot linePlot, JRBaseObjectFactory factory)
JRBaseMeterPlot(JRMeterPlot meterPlot, JRBaseObjectFactory factory)
Constructs a copy of an existing meter and registers all expressions maintained by the meter plot with a factory.JRBaseMultiAxisPlot(JRMultiAxisPlot multiAxisPlot, JRBaseObjectFactory factory)
Creates a copy of an existing multiple axis chart plot and registers any expression contained in the plot with the specified factory.JRBasePie3DPlot(JRPie3DPlot pie3DPlot, JRBaseObjectFactory factory)
JRBasePieDataset(JRPieDataset dataset, JRBaseObjectFactory factory)
JRBasePiePlot(JRPiePlot piePlot, JRBaseObjectFactory factory)
JRBasePieSeries(JRPieSeries pieSeries, JRBaseObjectFactory factory)
JRBaseScatterPlot(JRScatterPlot scatterPlot, JRBaseObjectFactory factory)
JRBaseThermometerPlot(JRThermometerPlot thermoPlot, JRBaseObjectFactory factory)
Constructs a new plot that is a copy of an existing one, and registers all expression used by the plot with the specified factory.JRBaseTimePeriodDataset(JRTimePeriodDataset dataset, JRBaseObjectFactory factory)
JRBaseTimePeriodSeries(JRTimePeriodSeries timePeriodSeries, JRBaseObjectFactory factory)
JRBaseTimeSeries(JRTimeSeries timeSeries, JRBaseObjectFactory factory)
JRBaseTimeSeriesDataset(JRTimeSeriesDataset dataset, JRBaseObjectFactory factory)
JRBaseTimeSeriesPlot(JRTimeSeriesPlot plot, JRBaseObjectFactory factory)
JRBaseValueDataset(JRValueDataset dataset, JRBaseObjectFactory factory)
Constructs a new dataset that is a copy of an existing one, and register all of the new dataset's expressions with the specified factory.JRBaseValueDisplay(JRValueDisplay valueDisplay, JRBaseObjectFactory factory)
Constructs a copy of an existing value format specification and registers any expression in the new copy with the specified factory.JRBaseXyDataset(JRXyDataset dataset, JRBaseObjectFactory factory)
JRBaseXySeries(JRXySeries xySeries, JRBaseObjectFactory factory)
JRBaseXyzDataset(JRXyzDataset dataset, JRBaseObjectFactory factory)
JRBaseXyzSeries(JRXyzSeries xyzSeries, JRBaseObjectFactory factory)
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Uses of JRBaseObjectFactory in net.sf.jasperreports.charts.util
Constructors in net.sf.jasperreports.charts.util with parameters of type JRBaseObjectFactory Constructor Description JRMeterInterval(JRMeterInterval meterInterval, JRBaseObjectFactory factory)
Construct a new interval by copying an existing one. -
Uses of JRBaseObjectFactory in net.sf.jasperreports.components.barbecue
Methods in net.sf.jasperreports.components.barbecue with parameters of type JRBaseObjectFactory Modifier and Type Method Description Component
BarbecueCompiler. toCompiledComponent(Component component, JRBaseObjectFactory baseFactory)
Constructors in net.sf.jasperreports.components.barbecue with parameters of type JRBaseObjectFactory Constructor Description StandardBarbecueComponent(BarbecueComponent barcode, JRBaseObjectFactory objectFactory)
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Uses of JRBaseObjectFactory in net.sf.jasperreports.components.barcode4j
Methods in net.sf.jasperreports.components.barcode4j with parameters of type JRBaseObjectFactory Modifier and Type Method Description Component
BarcodeCompiler. toCompiledComponent(Component component, JRBaseObjectFactory baseFactory)
Constructors in net.sf.jasperreports.components.barcode4j with parameters of type JRBaseObjectFactory Constructor Description CompiledBarcodeFactory(JRBaseObjectFactory baseFactory)
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Uses of JRBaseObjectFactory in net.sf.jasperreports.components.iconlabel
Methods in net.sf.jasperreports.components.iconlabel with parameters of type JRBaseObjectFactory Modifier and Type Method Description Component
IconLabelComponentCompiler. toCompiledComponent(Component component, JRBaseObjectFactory baseFactory)
Constructors in net.sf.jasperreports.components.iconlabel with parameters of type JRBaseObjectFactory Constructor Description IconLabelComponent(IconLabelComponent component, JRBaseObjectFactory objectFactory)
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Uses of JRBaseObjectFactory in net.sf.jasperreports.components.items
Constructors in net.sf.jasperreports.components.items with parameters of type JRBaseObjectFactory Constructor Description StandardItemData(ItemData data, JRBaseObjectFactory factory)
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Uses of JRBaseObjectFactory in net.sf.jasperreports.components.list
Methods in net.sf.jasperreports.components.list with parameters of type JRBaseObjectFactory Modifier and Type Method Description Component
ListComponentCompiler. toCompiledComponent(Component component, JRBaseObjectFactory baseFactory)
Constructors in net.sf.jasperreports.components.list with parameters of type JRBaseObjectFactory Constructor Description BaseListContents(ListContents listContents, JRBaseObjectFactory factory)
StandardListComponent(ListComponent list, JRBaseObjectFactory baseFactory)
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Uses of JRBaseObjectFactory in net.sf.jasperreports.components.map
Methods in net.sf.jasperreports.components.map with parameters of type JRBaseObjectFactory Modifier and Type Method Description Component
MapCompiler. toCompiledComponent(Component component, JRBaseObjectFactory baseFactory)
Constructors in net.sf.jasperreports.components.map with parameters of type JRBaseObjectFactory Constructor Description StandardItemData(ItemData data, JRBaseObjectFactory factory)
Deprecated.StandardMapComponent(MapComponent map, JRBaseObjectFactory objectFactory)
StandardMarkerDataset(MarkerDataset dataset, JRBaseObjectFactory factory)
Deprecated. -
Uses of JRBaseObjectFactory in net.sf.jasperreports.components.sort
Methods in net.sf.jasperreports.components.sort with parameters of type JRBaseObjectFactory Modifier and Type Method Description Component
SortComponentCompiler. toCompiledComponent(Component component, JRBaseObjectFactory baseFactory)
Constructors in net.sf.jasperreports.components.sort with parameters of type JRBaseObjectFactory Constructor Description SortComponent(SortComponent component, JRBaseObjectFactory objectFactory)
-
Uses of JRBaseObjectFactory in net.sf.jasperreports.components.spiderchart
Methods in net.sf.jasperreports.components.spiderchart with parameters of type JRBaseObjectFactory Modifier and Type Method Description Component
SpiderChartCompiler. toCompiledComponent(Component component, JRBaseObjectFactory baseFactory)
Constructors in net.sf.jasperreports.components.spiderchart with parameters of type JRBaseObjectFactory Constructor Description SpiderChartComponent(SpiderChartComponent chartComponent, JRBaseObjectFactory baseFactory)
StandardChartSettings(ChartSettings chart, JRBaseObjectFactory factory)
StandardSpiderDataset(SpiderDataset dataset, JRBaseObjectFactory factory)
StandardSpiderPlot(SpiderPlot spiderPlot, JRBaseObjectFactory factory)
-
Uses of JRBaseObjectFactory in net.sf.jasperreports.components.table
Methods in net.sf.jasperreports.components.table that return JRBaseObjectFactory Modifier and Type Method Description JRBaseObjectFactory
ColumnFactory. getBaseObjectFactory()
JRBaseObjectFactory
RowFactory. getBaseObjectFactory()
Methods in net.sf.jasperreports.components.table with parameters of type JRBaseObjectFactory Modifier and Type Method Description Component
TableCompiler. toCompiledComponent(Component component, JRBaseObjectFactory baseFactory)
Constructors in net.sf.jasperreports.components.table with parameters of type JRBaseObjectFactory Constructor Description ColumnFactory(JRBaseObjectFactory factory)
CompiledBaseCell(BaseCell cell, JRBaseObjectFactory factory)
CompiledCell(Cell cell, JRBaseObjectFactory factory)
CompiledRow(Row row, JRBaseObjectFactory factory)
RowFactory(JRBaseObjectFactory factory)
StandardTable(TableComponent table, JRBaseObjectFactory factory)
-
Uses of JRBaseObjectFactory in net.sf.jasperreports.components.table.fill
Subclasses of JRBaseObjectFactory in net.sf.jasperreports.components.table.fill Modifier and Type Class Description class
DatasetCloneObjectFactory
Object factory used to clone a report dataset.class
TableReportBaseObjectFactory
Constructors in net.sf.jasperreports.components.table.fill with parameters of type JRBaseObjectFactory Constructor Description TableJasperReport(JasperReport parentReport, TableReport baseReport, java.io.Serializable compileData, JRBaseObjectFactory factory, java.lang.String compileNameSuffix)
-
Uses of JRBaseObjectFactory in net.sf.jasperreports.crosstabs.base
Constructors in net.sf.jasperreports.crosstabs.base with parameters of type JRBaseObjectFactory Constructor Description BaseCrosstabColumnCell(CrosstabColumnCell cell, JRBaseObjectFactory factory)
JRBaseCellContents(JRCellContents cell, JRBaseObjectFactory factory)
JRBaseCrosstab(JRCrosstab crosstab, JRBaseObjectFactory factory, int id)
JRBaseCrosstabBucket(JRCrosstabBucket bucket, JRBaseObjectFactory factory)
JRBaseCrosstabCell(JRCrosstabCell crosstabCell, JRBaseObjectFactory factory)
JRBaseCrosstabColumnGroup(JRCrosstabColumnGroup group, JRBaseObjectFactory factory)
JRBaseCrosstabDataset(JRCrosstabDataset dataset, JRBaseObjectFactory factory)
JRBaseCrosstabGroup(JRCrosstabGroup group, JRBaseObjectFactory factory)
JRBaseCrosstabMeasure(JRCrosstabMeasure measure, JRBaseObjectFactory factory)
JRBaseCrosstabParameter(JRCrosstabParameter parameter, JRBaseObjectFactory factory)
JRBaseCrosstabRowGroup(JRCrosstabRowGroup group, JRBaseObjectFactory factory)
-
Uses of JRBaseObjectFactory in net.sf.jasperreports.engine
Constructors in net.sf.jasperreports.engine with parameters of type JRBaseObjectFactory Constructor Description JasperReport(JRReport report, java.lang.String compilerClass, java.io.Serializable compileData, JRBaseObjectFactory factory, java.lang.String compileNameSuffix)
-
Uses of JRBaseObjectFactory in net.sf.jasperreports.engine.analytics.dataset
Constructors in net.sf.jasperreports.engine.analytics.dataset with parameters of type JRBaseObjectFactory Constructor Description BaseDataAxis(DataAxis dataAxis, JRBaseObjectFactory factory)
BaseDataAxisLevel(DataAxisLevel level, JRBaseObjectFactory factory)
BaseDataLevelBucket(DataLevelBucket bucket, JRBaseObjectFactory factory)
BaseDataLevelBucketProperty(DataLevelBucketProperty property, JRBaseObjectFactory factory)
BaseDataMeasure(DataMeasure measure, JRBaseObjectFactory factory)
BaseMultiAxisData(MultiAxisData data, JRBaseObjectFactory factory)
BaseMultiAxisDataset(MultiAxisDataset dataset, JRBaseObjectFactory factory)
-
Uses of JRBaseObjectFactory in net.sf.jasperreports.engine.base
Methods in net.sf.jasperreports.engine.base with parameters of type JRBaseObjectFactory Modifier and Type Method Description static JRHyperlinkParameter[]
JRBaseHyperlink. copyHyperlinkParameters(JRHyperlink link, JRBaseObjectFactory factory)
protected void
JRBaseReport. copyTemplates(JRReport report, JRBaseObjectFactory factory)
-
Uses of JRBaseObjectFactory in net.sf.jasperreports.engine.component
Methods in net.sf.jasperreports.engine.component with parameters of type JRBaseObjectFactory Modifier and Type Method Description Component
ComponentCompiler. toCompiledComponent(Component component, JRBaseObjectFactory baseFactory)
Provides a "compiled" component instance that will be included in the compiled report.Constructors in net.sf.jasperreports.engine.component with parameters of type JRBaseObjectFactory Constructor Description BaseComponentContext(ComponentContext context, JRBaseObjectFactory objectFactory)
-
Uses of JRBaseObjectFactory in net.sf.jasperreports.engine.design
Constructors in net.sf.jasperreports.engine.design with parameters of type JRBaseObjectFactory Constructor Description JRDesignChartDataset(JRChartDataset dataset, JRBaseObjectFactory factory)
JRDesignElementDataset(JRElementDataset dataset, JRBaseObjectFactory factory)
-
Uses of JRBaseObjectFactory in net.sf.jasperreports.engine.part
Methods in net.sf.jasperreports.engine.part with parameters of type JRBaseObjectFactory Modifier and Type Method Description PartComponent
PartComponentCompiler. toCompiledComponent(PartComponent component, JRBaseObjectFactory baseFactory)
Provides a "compiled" component instance that will be included in the compiled report. -
Uses of JRBaseObjectFactory in net.sf.jasperreports.parts.subreport
Methods in net.sf.jasperreports.parts.subreport with parameters of type JRBaseObjectFactory Modifier and Type Method Description PartComponent
SubreportPartComponentCompiler. toCompiledComponent(PartComponent component, JRBaseObjectFactory baseFactory)
Constructors in net.sf.jasperreports.parts.subreport with parameters of type JRBaseObjectFactory Constructor Description StandardSubreportPartComponent(SubreportPartComponent subreport, JRBaseObjectFactory factory)
-


Sairam PL
Hyderabad,India
4 years of relevant experience in IT industry using Various BigData Tech Stack.
4 years of relevant experience in IT industry using Various BigData Tech Stack.
A Machine Learning Algorithms include Linear Regression,SVM, Logistic Regression, Decision Trees, Random Forest, KNN, Naive Bayes, Kmeans Clustering , Natural Language Processing and many more.Skilled in libraries such as Sklearn, Numpy, Pandas, Matplotlib and Seaborn for Data Visualization.
I spend a large amount of my free time exploring the latest technology advancements in the Data science world.


| 1 |
Opiyo_2015 |
In-service training for health professionals to improve care of seriously ill newborns and children in low-income countries |
Opiyo, Newton; English, Mike |
2015 |
2015-05-13 |
NONCOMM |
N |
PMC4463987 |
25968066.0 |
10.1002/14651858.cd007071.pub3 |
16b8drw2 |
0.786782 |
|
|
| 2 |
Golding_2017 |
Exploring the psychological health of emergency dispatch centre operatives: a systematic review and narrative synthesis |
Golding, Sarah E.; Horsfield, Claire; Davies, Annette; Egan, Bernadette; Jones, Martyn; Raleigh, Mary; Schofield, Patricia; Squires, Allison; Start, Kath; Quinn, Tom; Cropley, Mark |
2017 |
2017-10-17 |
COMM-USE |
N |
PMC5649589 |
29062596.0 |
10.7717/peerj.3735 |
yrpkfhe8 |
0.527338 |
Lipsitch_2014 |
|
| 3 |
Chan_2010 |
Post-traumatic stress disorder among Chinese women survivors of intimate partner violence: A review of the literature |
Chan, C.H.; Tiwari, A.; Fong, D.Y.T.; Ho, P.C. |
2010 |
2010-07-31 |
PMC |
N |
PMC7125845 |
20303490.0 |
10.1016/j.ijnurstu.2010.01.003 |
iwueedmm |
0.499606 |
Lipsitch_2014 |
|
| 4 |
Miller_2019 |
Mental well-being of international migrants to Japan: a systematic review |
Miller, Russell; Tomita, Yuri; Ong, Ken Ing Cherng; Shibanuma, Akira; Jimba, Masamine |
2019 |
2019-11-03 |
None |
N |
PMC6858191 |
31685498.0 |
10.1136/bmjopen-2019-029988 |
1nkpd0yv |
0.481874 |
|
Golding_2017 |
| 5 |
Lu_S_2019 |
Population-based surveys and interventions for mental health literacy in China during 1997–2018: a scoping review |
Lu, Shurong; Oldenburg, Brian; Li, Wenjing; He, Yanling; Reavley, Nicola |
2019 |
2019-10-26 |
COMM-USE |
N |
PMC6815452 |
31655552.0 |
10.1186/s12888-019-2307-0 |
pvfhn1wr |
0.349741 |
|
Miller_2019 |
| 6 |
Wang_2019 |
Evaluation of Public Health Emergency Management in China: A Systematic Review |
Wang, Jia; Yuan, Beibei; Li, Zhengmao; Wang, Zhifeng |
2019 |
2019-09-18 |
COMM-USE |
N |
PMC6766041 |
31540510.0 |
10.3390/ijerph16183478 |
0dygete9 |
0.303932 |
|
|


Allowing teachers to keep on teaching and making sure students are learning
Check out what you can do with this app theme!
Simple and easy to use interface across all devices
Easily intigrates with exiting software and use add-on features
Does not require any training to use and accessable to all
End to end encryption makes sure student and teacher data is safe
Quickly and easily reward outstanding students with points
Keep track of all the students progress and data


--- layout: post title: Using the Google Analytics Javascript API to show pageviews from Atlassian Confluence date: 2009-09-11 23:48:09.000000000 +01:00 type: post published: true status: publish categories: - Uncategorised tags: [] meta: aktt_notify_twitter: 'no' syntaxhighlighter_encoded: '1' _topsy_cache_timestamp: '1299685381' tmac_last_id: '618797407556517888' author: David Simpson excerpt_separator: ---
Here's a quick demo I wrote to test out the Google Analytics API.
It shows pageviews for an Atlassian Confluence wiki on a space by space basis.
You'll need your own copy of Confluence hooked up to Google Analytics for the demo to work, so I've done a video demo too - no sound, sorry.
Confluence & Google Analytics Javascript API from David Simpson on Vimeo.
The main problem for listing data on a space by space basis with the Google Analytics API is that there isn't an equivalent to the Content Drilldown report. My workaround was to get the 500 most popular pages, then using regular expressions, get the spacekeys, remove duplicates and sort alphabetically. Not particularly elegant, but hey.
It's a nice proof of concept, but I'd like to display this information - without the authentication and authorisation step - to users without access to Google Analytics.
e.g. To the owners/administrators of Confluence spaces.
The next step will be to rewrite in Java and embed the data and some charts directly into Confluence with a custom written macro.


[gecode-users] Rounding behavior of relational constraints
Joost van Twist
joost.van.twist at quintiq.com
Tue Nov 12 12:50:34 CET 2013
Dear all,
When using a relational constraint between two or more floating variables the bounds might not be always updated as you would expect during propagation. This happens only when being close to the maximum limits of floats. Why does this happen?
I have attached an example program. It has two variables and adds a constraint stating that the second variable should be bigger than the first plus some small constant. The lower bound of the second variable remains zero however under some conditions.
First I thought is was some kind of bug, but after posting a report, it appeared to be because of some rounding side effects and it is not an issue when the bounds shrink. Christian suggested to repost it as question. I have also attached the initial answer Vincent gave who worked on the floating module.
Kind regards,
Joost van Twist
Software Engineer
R&D Optimization Team
Quintiq
T +31 73 691 0739
M +31 63 179 1690
E joost.van.twist at quintiq.com
www.quintiq.com
Please consider the environment before printing this email.
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From: "Vincent Barichard" <Vincent.Barichard at univ-angers.fr>
Subject: Re: FW: [Gecode-bugs] New bug: Relational constraint gives inconsistent lowerbound for floating variables
Date: 10 Nov 2013 22:17:11 +0100
Size: 14147
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#include "gecode/float.hh"
#include "gecode/minimodel.hh"
using namespace Gecode;
class TestModel : public Gecode::Space
{
public:
FloatVar a;
FloatVar b;
TestModel()
: a(*this,0, 0),
b(*this,0, Gecode::Float::Limits::max) //using an upper bound significantly smaller is also a workaround
{
rel(*this, b >= a + 2.0); //lower bound of b will stay 0, when changing to ">" works fine
//rel(*this, b == 0); //will still make the space correctly infeasible
}
TestModel(bool share, TestModel& testmodel)
: Space(share, testmodel)
{
a.update(*this, share, testmodel.a);
b.update(*this, share, testmodel.b);
}
virtual Gecode::Space* copy(bool share)
{
return new TestModel(share, *this);
}
virtual void print(std::ostream& os) const
{
os << "a: " << a << " b: " << b << std::endl;
}
};
int main(int argc, char* argv[])
{
TestModel model;
if ( model.status() == SS_FAILED )
{
std::cout << "infeasible" << std::endl;
} else
{
std::cout << "feasible" << std::endl;
}
model.print(std::cout);
return 0;
}
More information about the users
mailing list


|
aws-crt-cpp
C++ wrapper around the aws-c-* libraries. Provides Cross-Platform Transport Protocols and SSL/TLS implementations for C++.
|
#include <HttpRequestResponse.h>
Public Member Functions | |
| HttpResponse (Allocator *allocator=g_allocator) | |
| Optional< int > | GetResponseCode () const noexcept |
| bool | SetResponseCode (int response) noexcept |
Additional Inherited Members |
Class representing a mutable http response.
| Aws::Crt::Http::HttpResponse::HttpResponse | ( | Allocator * | allocator = g_allocator | ) |
|
noexcept |
Gets the integral Http response code associated with this response
|
noexcept |
Sets the integral Http response code associated with this response


| Struts 2 > Home > Tutorials > Step by Step > Understanding Actions |
In the Hello World lesson, we implemented a use case that displayed a message with a dynamic timestamp. In this lesson, we create a workflow that displays input from a data-entry form.
The form will ask for your name. If you enter "Zaphod" and click the submit button, the page will display "Hello, Zaphod!". If you don't enter a name, the page will display: "Hmmm, you did not enter a name. Please try again!"
In the Hello World lesson, there were three components: the Action class, the result page, and the action mapping. In this lesson, we will add a fourth component: an input form.
The framework includes a library of special tags that you can use to write dynamic forms, but "plain old HTML" forms work just fine too.
  <title>A simple HTML form with data</title>
What is your name?
 <form action="HelloName.action" method="post">
<input type="text" name="name">

<input type="submit" value="Submit your name." />
 </form>
The HTML form submits an attribute called "name", and the Action class provides a corresponding JavaBean property.
package tutorial; import com.opensymphony.xwork2.ActionSupport; public class HelloName extends ActionSupport { public String execute() throws Exception { if (getName() == null || getName().length() == 0) return ERROR; else return SUCCESS; } private String name; public String getName() { return name; } public void setName(String name) { this.name = name; } }
We can just add a new action mapping to the file we started in the Hello World lesson.
<!DOCTYPE struts PUBLIC "-//Apache Software Foundation//DTD Struts Configuration 2.0//EN" "http://struts.apache.org/dtds/struts-2.0.dtd"> <struts> <include file="struts-default.xml" /> <package name="actions" extends="struts-default"> <action name="HelloName" class="tutorial.HelloName"> <result name="success">HelloName-success.jsp</result> <result name="error">HelloName-error.html</result> </action> </package> </struts>
The Action can select between two outcomes, "success" and "failure".
<%@ taglib prefix="s" uri="/struts-tags" %>   <title>Success Page</title>
 Hello, <s:property value="name" />!

  <title>Error Page</title>
 Hmmm, you did not enter a name. Please try again!

If you are coding along, go ahead and try your form now. Open the input page (http://localhost:8080/tutorial/HelloName.html), and click the submit button to see what happens. Try it with and without entering a name.
| Don't forget! Compile your Action to WEB-INF/classes and restart your container if necessary. |
There are two differences between this example and the previous Hello World lesson.
Let's try a slightly different approach to solve the same use case.
In our first form, we needed to capture the field name. To do that, we added the getters and setters getName and setName to the Action class, as well as the private variable name. A larger application with dozens of forms and hundreds of form fields could need several hundred getters and setters. Let's try that same use case again, but without the JavaBean methods.
Let's use the same HTML form, but change the form Action to HelloName2.action:
  <title>A simple form with data</title>
What is your name?
 <form action="HelloName2.action" method="post">
<input type="text" name="name">

<input type="submit" value="Submit your name." />
 </form>
package tutorial; import com.opensymphony.xwork2.ActionSupport; import org.apache.struts2.interceptor.ParameterAware; import java.util.Map; public class HelloName2 extends ActionSupport implements ParameterAware { public static String NAME = "name"; public String execute() { String[] name = (String[]) parameters.get(NAME); if (name == null || name[0] == null || name[0].length() == 0) return ERROR; else return SUCCESS; } Map parameters; public Map getParameters() { return parameters; } public void setParameters(Map parameters) { this.parameters = parameters; } }
<?xml version="1.0" encoding="UTF-8" ?> <!DOCTYPE struts PUBLIC "-//Apache Software Foundation//DTD Struts Configuration 2.0//EN" "http://struts.apache.org/dtds/struts-2.0.dtd"> <struts> <include file="struts-default.xml"/> <package name="actions" extends="struts-default"> <action name="HelloName" class="tutorial.HelloName"> <result name="success">/HelloName-success.jsp</result> <result name="error">HelloName-error.html</result> </action> <action name="HelloName2" class="tutorial.HelloName2"> <result name="success">HelloName2-success.jsp</result> <result name="error">HelloName-error.html</result> </action> </package> </struts>
We can use the same error page, but we'll need a slightly different success page HelloName2-success.jsp. The only difference is the <s:property> tag.
<%@ taglib prefix="s" uri="/tags" %>   <title>Success Page - Without Using Getters and Setters</title>
 Hello, <s:property value="parameters.name"/>!

Go ahead and try it now. Load (http://localhost:8080/tutorial/HelloName2.html), enter "Zaphod" in the text field, and click the form submit button. You should see HelloName2-success.jsp saying "Hello, Zaphod!"
| Don't forget! Compile your Action to WEB-INF/classes and restart your container if necessary. |
Instead of a setter setName accessing a private variable name in the Action class, setParameters magically extracts everything from the request object and puts the attributes into a private local Map, parameters. In the execute method, we can get the value from the parameters Map instead of looking for a name property. So far so good.
Back on the HelloName2-success.jsp page, <s:property value="name" /> isn't going to work any more, because there is no getName() method in the Action. Instead, <s:property value="parameters.name" /> calls the getParameters method, and is able to get the value of the "name" field. Pretty neat!
Before processing an Action, the framework matches any Action properties with request attributes. If a match is found, the attribute value is set to the Action property. The Action can process the value, and the Struts tags can present the value too. Rather than define a separate property for each attribute, you can define a single Map property instead. In that case, all the request attributes will be set to the Map automatically.
| Next | Onward to Understanding Results |
|---|---|
| Prev | Return to Hello World |


Programming Languages
-
{{#each item in languages}}
- {{item.name}} ({{item.date}}) {{/each}}
Database-Related
- MongoDB
- MySQL
- PostgreSQL
Web Frameworks and Libraries
- Bootstrap
- jQuery
- Meteor
- Node.js
{{item.major}} - Graduated: {{renderYear item.endDate}}
{{{item.description}}}
{{item.position}} / {{item.location}} / {{renderDate item.startDate}} - {{renderDate item.endDate}}
{{{item.description}}}
{{item.category}} / {{renderLanguage item.languages}} / {{renderDate item.startDate}} - {{renderDate item.endDate}}
{{{item.description}}}
Student Gold for Interactive Website - Mar 2012
What happens when you're 17 years-old, your teacher recommends you to enter your senior project into a contest, and you learn after entering that it was only for college students?
You win gold. Weird.
Eagle Scout with 3 Palms - Sept 2011
Best Website within SR-5 - Apr 2010, Apr 2011
I look back at my past-self who wanted to quit Boy Scouts in 2009 and ask my current-self, "Why did I want to do that?"


SHARAN SRJ
Brief About Me
A Student,influencer,singer,dancer,actor and a lot more.
Education
- Done my School Education from Dnyan Prabodhan Mandir.(Scored 92% in 10th)
- Done my College Education from KLE IPC College.(Scored 94% in 12th)
- Doing my Engineering in KLS Gogte Institute Of Technology.(Scored 9.4 Cgpa in 1st Year)


Simulation of a two dimensional cylinder heaving over surface of a water.
How the law of conservation of heat transforms into a partial differential equation.
Hyde is a brazen two-column Jekyll theme that pairs a prominent sidebar with uncomplicated content. It’s based on Poole, the Jekyll butler.


I find it nice to have role models. People around me who make my life nicer, and other people's lives nicer, and then I try to think: how can I be more like them? And what would make them think I am a good person?
Then I do nice things like:
Smile kindly at mistakes
Forgive more easily
Use diplomatic language
Help others
Be positive and curious
❤
So, if you are my role model, keep being great 😃
Do you have role models, dear reader?


After analyzing all the positions of the Kinect on the robot, I selected the most adequate one which I believe is the position in which it as 4 degrees of freedom and its located on the side of the robot's arm. To install the Kinect in the robot it was necessary to design a support. To do so, this week I started by modeling a structure that could be screwed to one of the arms, represented below.
While opening the arm of the robot I noticed that there was not enough space to safely drill two holes to secure the support.
Therefore, another support was designed to avoid drilling the robot. The final model is represented in the pictures below.
After the manufacture of the support the Kinect was correctly installed.
Now, with the Kinect properly installed, it is fundamental to calibrate its extrinsic parameters, task which I will continue to do next week.
Robot FanucIn order to know all the transformations between the coordinate systems of the Kinect, the laser sensor, the robot and the gripper, I started by including the urdf files of the Fanuc LR mate200iD to have all the coordinate frames of the joints. The referential of the base of the robot was defined as the global coordinate system. Knowing that the urdf files of the Fanuc robot dose not incorporate the coordinate frame of the tool center point (TCP), I had to determine the exact length of the gripper. To do so, I visualized the values of the joints, and its coordinate systems, of the real robot in Rviz with the following command.
roslaunch bin_picking robot_state_visualize.launch
By moving the end effector closer to the table I was able to determine the difference in the Z axis between the referencial of the the tip of the gripper and the end of the robot. This process is represented in the pictures below.
This way the origin of the referencial of the end of the gripper was represented with an offset of 166mm. Knowing this I was now able to design a simple gripper to represent the real one. By incorporating it in the urdf files and the description of the last coordinate system, I could visualize the robot, the gipper in the respective position and all the coordinate systems so far, using the next command.
roslaunch bin_picking globalvisualization.launch
Given the fact that it is necessary to move the robot to positions with accuracy in oder to calibrate the sensor laser and to move to the exact centroid of an object, detected by the Kinect, I implemented a library developed by an ex-student. João Peixoto developed a library that allows you to communicate with Fanuc robot using a TCP/IP connection and send and receive commands in the robCOMM language. By running the next command I am able to run a program that moves the robot to a desired joint or cartesian position.
rosrun fanuc_control fanuc_control
Laser Sensor
This week I also changed the circuit used to convert the output signal of the laser sensor with the purpose of decreasing the cut-off frequency (ƒc). I used a ƒc of 99.5Hz to filter the readings of the sensor and eliminate undesired higher frequencies. Additionally, I altered the maximum reading of the sensor to 500mm, thus forcing the readings to cover only a range of 400mm, this way having a better accuracy in the measurements outputted by the device. The circuit implemented and the respective schematics represented bellow.
After redoing the entire process of gathering some analyses I obtained the next curve with the respective equation.
This equation was implemented in the code of the Arduino and the readings obtained with it were considerably more satisfactory. For example in a reading of 296mm the readings changed between the values of 295.87mm and 296.44mm.
Now it is necessary to implement the coordinate system of the sensor in the global one, to do so I have to determine the transformation from the base of the the robot to the exact position where it has been installed. To verify if the angle of the laser is 90 degrees from the table I used the robCOMM library to ensure the 5th joint was exactly 90 degrees from the table and moved the robot in the Z direction. I started the movement in the position represented bellow which is 70mm from the base of the robot, where I marked the center of the laser.
The movement ended in the following position which is 528mm from the base. It is possible to notice that the laser moved more os less 4mm.
Next I have to correctly determine the transformation from the point of the gripper to laser in the X, Y and Z dirrections.


Handles file paths.
The path library provides functions that handle file paths.
Cleans up a file path.
The clean function returns the shortest path equivalent to path. Separators are replaced with the OS-specific path separator.
Expands predefined file path variables.
The expand function scans path for certain variables of the
form $var
or ${var}
an expands them. The following
variables are expanded:
| Variable | Description |
|---|---|
$script_name , $sn |
The base name of the currently running script. Empty for stdin. |
$script_directory , $script_dir , $sd |
The directory of the currently running script. Expands to the working directory for stdin. Causes an error if the working directory could not be located. |
$root_script_directory , $root_script_dir , $rsd |
The directory of the first running script. Expands to the working directory for stdin. Causes an error if the working directory could not be located. |
$working_directory , $working_dir , $wd |
The current working directory. Causes an error if the working directory could not be located. |
$temp_directory , $temp_dir , $tmp |
The directory for temporary files. Causes an error if a temporary directory could not be located. |
Other variables cause an error to be thrown.
Joins a number of file paths together.
The join function joins each path element into a single path, separating them using the operating system's path separator. This also cleans up the path.
Produces a relative path.
The rel function returns a relative path that is equivalent to targetPath when joined with basePath, such that following equivalence is true:
path.clean(targetPath) == path.join(basePath, path.rel(basePath, targetPath))
path.clean is called on the result. Returns nil if targetPath cannot be made relative to basePath.
Splits a file path into its components.
The split function returns the components of a file path.
| Component | project/scripts/main.script.lua |
Description |
|---|---|---|
base |
main.script.lua |
The file name; the last element of the path. |
dir |
project/scripts |
The directory; all but the last element of the path. |
ext |
.lua |
The extension; the suffix starting at the last dot of the last element of the path. |
fext |
.script.lua |
The format extension, as determined by registered formats. |
fstem |
main |
The base without the format extension. |
stem |
main.script |
The base without the extension. |
A format extension depends on the available formats. See Formats for more information.


A classic navigation.
This is an example of a form submission that mimicks the classic POST/redirect cycle on regular HTML forms, thus not allowing the user to re-issue the POST by navigating via the back button. You can navigate back and forward between the previously displayed page and the one after the redirect.
This is an example of a form which updates a resource, without redirecting the user after completion: it mimicks the classic POST/print response cycle. The server response simply updates the container.
This is the container. Use the examples to make it change :-).


{% extends 'emails/email_root.html' %} {% block title %} test {% endblock %} {% block body %} {% if context.rls == None %} {% if context.legislators['contactable'] %}
Your message is schedule to be sent to the following legislators:
We unfortunately could not send your message to the following legislators because our records indicate that you do not reside in their district. If your address has changed then please click here to enter in your new address.
The following legislators exist but we unfortunately can not currently send messages to them. Possible reasons include the legislator has taken down their webform, technical limitations, or an error in our system.
The following emails are unrecognizable by our system. Check out the legislator index to find emails for particular legislators. You can also contact all of your representatives by sending your message to myreps@emailcongress.us.


MXQuery :: Getting Started with the command line
Introduction
Executing
This tutorial will introduce you to the usage of the MXQuery Command Line Interface.
In the following it's assumed that the user has already opened the command line interface with the current directory set to the path where the mxquery.jar file is located.
You can execute the MXQuery engine in the command line interface using
java –jar mxquery.jar
Executing this command without any parameters will output the usage text with a list of all possible options and its description.
MXQuery 0.6.0
usage: java -jar mxquery.jar
...
Now let's look at some basic options and their usage.
Basics
Input / Output
The input option is required for every query. The MXQuery engine provides three different options for input
- inline query -i
- query file -f <file>
- query plan -p <file>
and three different options for output
- discard result (no output) -d
- standard out -o -
- output file -o <file>
The standard out is set by default, meaning that if no output option is provided, the MXQuery engine will automatically write the result to the standard output stream.
Here are some examples:
1) inline query, standard out
java –jar mxquery.jar –i 1+1 –o –
will return the following in the standard output stream
MXQuery 0.6.0
<?xml version='1.0' encoding='UTF-8' ?>
2
The same would have been achieved with
java –jar mxquery.jar –i 1+1
will return the following in the standard out, since the standard output stream is set by default.
2) query file, output file
For this second example let's write a little query file myInput.xq containing an arbitrary XQuery expression, say "hello world" for simplicity, and save the file in the same directory as mxquery.jar is located.
java –jar mxquery.jar –f myInput.xq –o myOutput.xml
will execute the query from the myInput.xq file and print the output
<?xml version='1.0' encoding='UTF-8' ?>
hello world
in myOutput.xml by either creating a new file or overwriting the existing one.
3) query plan
TO DO
Print Options
Now that we have understand the input/output behavior of the MXQuery engine. We continue with some options providing additional information to the XQuery:
- explain
- printStores
- timing
- verbose
Advanced
Serializer
The MXQuery Command Line Interface allows you to set the serializer parameters according to your preferences. We present you only a few parameter settings in order to keep the tutorial compact. You may want to refer to the MXQuery CLI Specification to get a full list of parameter options.
java –jar mxquery.jar –i "for $i in <person><name>John</name><surname>smith</surname></person>
return $i" –s indent=true
Will add whitespaces to the result for readability, and return
MXQuery 0.6.0
<?xml version='1.0' encoding='UTF-8' ?>
<person>
<name>
John
</name>
<surname>
smith
</surname>
</person>
Instead of the result we would have received without setting the indent parameter of the serializer
MXQuery 0.6.0
<?xml version='1.0' encoding='UTF-8' ?>
<person><name>John</name><surname>smith</surname></person>
To set several parameters of the serializer simply write several –s in your command, like
java –jar mxquery.jar –i "for $i in <person><name>John</name><surname>smith</surname></person>
return $i" -s indent=true –s omit-xml-declaration=true
Context
The MXQuery Command Line Interface also allows you to set the static context in which the XQuery will be executed. As with the serializer we only present a few context components and let you consult the MXQuery CLI Specification for a full list of context components.
By default MXQuery will preserve the node ordering, which might not be as efficient as if MXQuery could decide by himself in which order it want to process the document nodes. In these cases you can set the context parameter ordering to unordered.
-i "for $i in <parent><child>alice</child><child>bob</child>charlie<child> </child></parent> return $i/child" -c ordering=unordered
The result is now not deterministic and might be of any ordering
MXQuery 0.6.0
<?xml version='1.0' encoding='UTF-8' ?>
<child>alice</child><child>bob</child><child>charlie</child>
You can also bind external variables and execute a command like
-i "declare variable $a external;<result>{$a}</result>" -e a:="<node>this node is bound externally</node>"
Which will return
MXQuery 0.6.0
<?xml version='1.0' encoding='UTF-8' ?>
<result><node>this node is bound externally</node></result>


At least one of your lines is not properly filled in. Do you want to proceed without incorrect lines?
You have chosen too few lines. The minimal amount for this lottery is %1s lines! Do you want to quick pick the lines for you?
You have chosen a wrong amount of lines. The chosen lines count should be a multiple of %1s. Do you want to quick pick the rest of the lines for you?
You need to choose at least 0 lines for every 0-lines ticket!


{% extends "base.html" %} {% block title %}Dashboard - Toolshare{% endblock %} {% block content %} {% load inbox %} {% unread_inbox_count as unread_inbox_num %} {% unread_checkout_count as unread_checkout_num %} {% include "navigation.html" %}
We missed you! You last logged in on {{ user.last_login }}
{{ My_Out_Tools |length }} of your tools are currently out.
{% else %} {{ My_Out_Tools |length }} of your tools are currently out. {% endif %} {% else %}You currently own 0 tools.
0 of your tools are currently out.
{% endif %}You currently have 0 unread messages.
{% endif %} {% if unread_checkout_num == 1 %} You currently have {{ unread_checkout_num }} unread requests. {% elif unread_inbox_num > 1 %} You currently have {{ unread_checkout_num }} unread requests. {% else %}You currently have 0 unread requests.
{% endif %}


Town
Kingdom Status
Good/Evil:
0
Fame:
0
Fortune:
0
Leave Town
Adventures
Adventure 1: The Sickness
Adventure 2: The Grand Tournament
Adventure 3: The Maze
Adventure 4: Rise of the Rats
Adventure 5: The Golden Sword
Adventure 6: The Dark Throne
Adventure 7: The Dragon of Ice
Adventure 8: The City of Death
Adventure 9: Thieves of Honor
Adventure 10: The Key and Shield
Tavern
Enter a display name to begin messaging:
Submit
Message:
Submit


User Policy & Privacy Policy
Terms of Use
These Terms of Use govern your use of “Dump Trump” (Otherwise referred to as the service) and provide information about the app, outlined below. When you create a Dump Trump account or use Dump Trump, you agree to these terms.
The Dump Trump is a Rumble Capital product, provided to you by Rumble Capital Inc.
The Dump Trump App
Dump Trump is a social game app designed to help secure votes to beat Donald Trump in 2020. On this app, users are able to do the following and get points:
- Post reasons to vote out Donald Trump on November 4, 2020.
- Share the app with friends.
The username’s of most active members are ranked to encourage competition.
Your Commitments
- In return for our commitment to provide the Service, we need you to commit to the following restrictions in order to use the service.
- You can't do anything unlawful, misleading, or fraudulent or for an illegal or unauthorized purpose.
- You can't post content that violates (or help or encourage others to violate) these Terms or our policies, including in particular the Google Play Store or IOS App store policies governing objectionable content, our own.
This includes any content that includes profanity or encourages violence, obscenities, or any other unlawful behavior.
- You can't do anything to interfere with or impair the intended operation of the Service.
- You can't attempt to buy, sell, or transfer any aspect of your account (including your username) or solicit, collect, or use login credentials or badges of other users.
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Learn more, including how to report content that you think infringes your intellectual property rights, here.
- You can't use a domain name or URL in your username without our prior written consent.
Permissions You Give to Us.
As part of our agreement, you also give us permissions that we need to provide the Service.
We do not claim ownership of your content, but you grant us a license to use it. You are free to delete account at any time in menu.
Additional Rights We Retain
If you select a username or similar identifier for your account, we may change it if we believe it is appropriate or necessary (for example, if it infringes someone's intellectual property or impersonates another user).
If you use content covered by intellectual property rights that we have and make available in our Service (for example, images, designs, videos, or sounds we provide that you add to content you create or share), we retain all rights to our content (but not yours).
You can only use our intellectual property and trademarks or similar marks as expressly permitted by our Brand Guidelines or with our prior written permission.
You must obtain written permission from us or under an open source license to modify, create derivative works of, decompile, or otherwise attempt to extract source code from us.
Content Removal and Disabling or Terminating Your Account
We can remove any content or information you share on the Service if we believe that it violates the terms listed in the “Your Commitments” section of this agreement.
Repeated offenders will have their account terminated.
Our Agreement and What Happens if We Disagree
Who Has Rights Under this Agreement.
This agreement does not give rights to any third parties except for parties we chose to aid us in any potential litigation.
You cannot transfer your rights or obligations under this agreement without our consent.
Our rights and obligations can be assigned to others. For example, this could occur if our ownership changes (as in a merger, acquisition, or sale of assets) or by law.
Who Is Responsible if Something Happens.
Our Service is provided "as is," and we can't guarantee it will be safe and secure or will work perfectly all the time.
We also don’t control what people and others do or say, and we aren’t responsible for their (or your) actions or conduct (whether online or offline) or content (including unlawful or objectionable content). We also aren’t responsible for services and features offered by other people or companies, even if you access them through our Service.
Our responsibility for anything that happens on the Service (also called "liability") is limited as much as the law will allow. If there is an issue with our Service, we can't know what all the possible impacts might be. You agree that we won't be responsible ("liable") for any lost profits, revenues, information, or data, or consequential, special, indirect, exemplary, punitive, or incidental damages arising out of or related to these Terms, even if we know they are possible. This includes when we delete your content, information, or account. Our aggregate liability arising out of or relating to these Terms will not exceed the greater of $100 or the amount you have paid us in the past twelve months.
You agree to defend (at our request), indemnify and hold us harmless from and against any claims, liabilities, damages, losses, and expenses, including without limitation, reasonable attorney's fees and costs, arising out of or in any way connected with these Terms or your use of the Service. You will cooperate as required by us in the defense of any claim. We reserve the right to assume the exclusive defense and control of any matter subject to indemnification by you, and you will not in any event settle any claim without our prior written consent.
How We Will Handle Disputes.
You and we agree that any cause of action, legal claim, or dispute between you and us arising out of or related to these Terms or Instagram ("claim(s)") must be resolved by arbitration on an individual basis. Class actions and class arbitrations are not permitted; you and we may bring a claim only on your own behalf and cannot seek relief that would affect other Instagram users. If there is a final judicial determination that any particular claim (or a request for particular relief) cannot be arbitrated in accordance with this provision's limitations, then only that claim (or only that request for relief) may be brought in court. All other claims (or requests for relief) remain subject to this provision.
Updating These Terms
We may change our Service and policies, and we may need to make changes to these Terms so that they accurately reflect our Service and policies. Unless otherwise required by law, we will notify you (for example, through our Service) before we make changes to these Terms and give you an opportunity to review them before they go into effect. Then, if you continue to use the Service, you will be bound by the updated Terms. If you do not want to agree to these or any updated Terms, you can delete your account in side menu of application.
Revised: April 19, 2018
Information gathering and usage
>Dump Trump promotes anonymity for all users with anonymous login and universal use of usernames. We're not really into gathering info just beating Donald Trump.
Changes
If our information practices change at some time in the future we will post the policy changes to our Web site to notify you of these changes and we will use for these new purposes only data collected from the time of the policy change forward. If you are concerned about how your information is used, you should check back at our Web site periodically.
If you feel that this site is not following its stated information policy, you may contact us at<EMAIL_ADDRESS>These Terms of Use govern your use of “Dump Trump” (Otherwise referred to as the service) and provide information about the app, outlined below. When you create a Dump Trump account or use Dump Trump, you agree to these terms.
The Dump Trump is a Rumble Capital product, provided to you by Rumble Capital Inc.
The Dump Trump App
Dump Trump is a social game app designed to help secure votes to beat Donald Trump in 2020. On this app, users are able to do the following and get points:
- Post reasons to vote out Donald Trump on November 4, 2020.
- Share the app with friends.
Your Commitments
- In return for our commitment to provide the Service, we need you to commit to the following restrictions in order to use the service.
- You can't do anything unlawful, misleading, or fraudulent or for an illegal or unauthorized purpose.
- You can't post content that violates (or help or encourage others to violate) these Terms or our policies, including in particular the Google Play Store or IOS App store policies governing objectionable content, our own. This includes any content that includes profanity or encourages violence, obscenities, or any other unlawful behavior.
- You can't do anything to interfere with or impair the intended operation of the Service.
- You can't attempt to buy, sell, or transfer any aspect of your account (including your username) or solicit, collect, or use login credentials or badges of other users.
- You can't post private or confidential information or do anything that violates someone else's rights, including intellectual property. Learn more, including how to report content that you think infringes your intellectual property rights, here.
- You can't use a domain name or URL in your username without our prior written consent.
Permissions You Give to Us.
As part of our agreement, you also give us permissions that we need to provide the Service.
We do not claim ownership of your content, but you grant us a license to use it. You are free to delete account at any time in menu.
Additional Rights We Retain
If you select a username or similar identifier for your account, we may change it if we believe it is appropriate or necessary (for example, if it infringes someone's intellectual property or impersonates another user).
If you use content covered by intellectual property rights that we have and make available in our Service (for example, images, designs, videos, or sounds we provide that you add to content you create or share), we retain all rights to our content (but not yours).
You can only use our intellectual property and trademarks or similar marks as expressly permitted by our Brand Guidelines or with our prior written permission.
You must obtain written permission from us or under an open source license to modify, create derivative works of, decompile, or otherwise attempt to extract source code from us.
Content Removal and Disabling or Terminating Your Account
We can remove any content or information you share on the Service if we believe that it violates the terms listed in the “Your Commitments” section of this agreement.
Repeated offenders will have their account terminated.
Our Agreement and What Happens if We Disagree
Who Has Rights Under this Agreement.
This agreement does not give rights to any third parties except for parties we chose to aid us in any potential litigation.
You cannot transfer your rights or obligations under this agreement without our consent.
Our rights and obligations can be assigned to others. For example, this could occur if our ownership changes (as in a merger, acquisition, or sale of assets) or by law.
Who Is Responsible if Something Happens.
Our Service is provided "as is," and we can't guarantee it will be safe and secure or will work perfectly all the time.
We also don’t control what people and others do or say, and we aren’t responsible for their (or your) actions or conduct (whether online or offline) or content (including unlawful or objectionable content). We also aren’t responsible for services and features offered by other people or companies, even if you access them through our Service.
Our responsibility for anything that happens on the Service (also called "liability") is limited as much as the law will allow. If there is an issue with our Service, we can't know what all the possible impacts might be. You agree that we won't be responsible ("liable") for any lost profits, revenues, information, or data, or consequential, special, indirect, exemplary, punitive, or incidental damages arising out of or related to these Terms, even if we know they are possible. This includes when we delete your content, information, or account. Our aggregate liability arising out of or relating to these Terms will not exceed the greater of $100 or the amount you have paid us in the past twelve months.
You agree to defend (at our request), indemnify and hold us harmless from and against any claims, liabilities, damages, losses, and expenses, including without limitation, reasonable attorney's fees and costs, arising out of or in any way connected with these Terms or your use of the Service. You will cooperate as required by us in the defense of any claim. We reserve the right to assume the exclusive defense and control of any matter subject to indemnification by you, and you will not in any event settle any claim without our prior written consent.
How We Will Handle Disputes.
You and we agree that any cause of action, legal claim, or dispute between you and us arising out of or related to these Terms or Instagram ("claim(s)") must be resolved by arbitration on an individual basis. Class actions and class arbitrations are not permitted; you and we may bring a claim only on your own behalf and cannot seek relief that would affect other Instagram users. If there is a final judicial determination that any particular claim (or a request for particular relief) cannot be arbitrated in accordance with this provision's limitations, then only that claim (or only that request for relief) may be brought in court. All other claims (or requests for relief) remain subject to this provision.
Updating These Terms
We may change our Service and policies, and we may need to make changes to these Terms so that they accurately reflect our Service and policies. Unless otherwise required by law, we will notify you (for example, through our Service) before we make changes to these Terms and give you an opportunity to review them before they go into effect. Then, if you continue to use the Service, you will be bound by the updated Terms. If you do not want to agree to these or any updated Terms, you can delete your account in side menu of application.
Revised: April 19, 2018
Information gathering and usage
>Dump Trump promotes anonymity for all users with anonymous login and universal use of usernames. We're not really into gathering info just beating Donald Trump.
Changes
If our information practices change at some time in the future we will post the policy changes to our Web site to notify you of these changes and we will use for these new purposes only data collected from the time of the policy change forward. If you are concerned about how your information is used, you should check back at our Web site periodically.
If you feel that this site is not following its stated information policy, you may contact us at cfr2116@columbia.edu.


--- title: "Days 23-27: Using jmDNS for service discovery" created: !!timestamp '2019-02-13 12:00:00' --- {% mark excerpt -%} Continuing with my distributed systems [skeleton project](distributed-systems-getting-started-2.html), I've been playing around with [service discovery](https://en.wikipedia.org/wiki/Service_discovery) with [jmDNS](https://github.com/jmdns/jmdns). jmDNS is a pure Java implementation of [Zeroconf](https://en.wikipedia.org/wiki/Zero-configuration_networking), better known as [Apple Bonjour](https://en.wikipedia.org/wiki/Bonjour_(software)). I'm using multicast service discovery to announce instances of my skeleton project to the network, and to discover other instances of the service. {%- endmark %} Multicast simply means sending data to multiple destination computers simultaneously. {% mark image -%} ![Circles and arrows showing one node sending to multiple nodes)]([[!!img/multicast.png]]) {%- endmark %} In Java, you can do that with the [java.net.MulticastSocket](https://docs.oracle.com/javase/7/docs/api/java/net/MulticastSocket.html) class:
byte[] message = ... InetAddress addr = InetAddress.getByName(DNSConstants.MDNS_GROUP); // <IP_ADDRESS> int port = DNSConstants.MDNS_PORT; // 5353 MulticastSocket ms = new MulticastSocket(port); DatagramPacket packet = new DatagramPacket(message, message.length, addr, port); ms.send(packet);The messages themselves can be [questions or replies](https://en.wikipedia.org/wiki/Domain_Name_System#DNS_message_format), and both can contain DNS [A](https://www.cloudflare.com/learning/dns/dns-records/dns-a-record/), [PTR](https://www.cloudflare.com/learning/dns/dns-records/dns-ptr-record/), [SRV](https://en.wikipedia.org/wiki/SRV_record) and/or [TXT](https://en.wikipedia.org/wiki/TXT_record) records. With a debugger attached to my application, I can see a conversation that goes something like this:
Query PTR _hello-distributed-systems._tcp.local.
Query PTR _hello-distributed-systems._tcp.local.
Answer A localhost.local. <IP_ADDRESS> 3600
Query ANY localhost.local.
Answer A localhost.local. <IP_ADDRESS> 3600
Answer TXT 12b84326-467a-4ae4-bd6e-0ac566ba7811._hello-distributed-systems._tcp.local. "".
Query ANY 46ff1ae4-1b48-4ea7-8cb1-1b0ca936f60f._hello-distributed-systems._tcp.local.?
Answer SRV 46ff1ae4-1b48-4ea7-8cb1-1b0ca936f60f._hello-distributed-systems._tcp.local. localhost.local.:5003 3600
Answer TXT 46ff1ae4-1b48-4ea7-8cb1-1b0ca936f60f._hello-distributed-systems._tcp.local. "" 3600
...
Hello. What does _hello-distributed-systems._tcp.local. point to?
Hi! What does _hello-distributed-systems._tcp.local. point to?
I can't tell you about that, but I can tell you that localhost.local. has IP <IP_ADDRESS>.
Can you tell me anything about localhost.local.?
Yes I can! localhost.local. has IP <IP_ADDRESS>.
Also, 12b84326-467a-4ae4-bd6e-0ac566ba7811._hello-distributed-systems._tcp.local. has text "".
That's really helpful! What do you know about 46ff1ae4-1b48-4ea7-8cb1-1b0ca936f60f._hello-distributed-systems._tcp.local.?
46ff1ae4-1b48-4ea7-8cb1-1b0ca936f60f._hello-distributed-systems._tcp.local. provides the service localhost.local.:5003
Also, it has text "".
...


1466_gzzll.py
from collections import Counter
# Definition for a binary tree node.
# class TreeNode:
# def __init__(self, val=0, left=None, right=None):
# self.val = val
# self.left = left
# self.right = right
class Solution:
def pseudoPalindromicPaths (self, root: TreeNode) -> int:
if root is None:
return 0
counters = Counter()
result = 0
def dfs(node):
nonlocal result
if node is None:
return
counters[node.val] += 1
if node.left is None and node.right is None:
odd_count = 0
for val, count in counters.items():
if count % 2 != 0:
odd_count += 1
if odd_count > 1:
break
if odd_count <= 1:
result += 1
dfs(node.left)
dfs(node.right)
counters[node.val] -= 1
dfs(root)
return result


Walsall 2-1 Cambridge - Player ratings
Liam Keen rates Walsall's players after an impressive victory over Cambridge United.
by Liam KeenLIAM ROBERTS
Liam Roberts had little to do for most of the game, but when called upon he did pull off impressive saves. His distribution was also positive, resulting in an overall solid performance. He did drop the ball from a cross in the second half, but the defenders cleared it. 6
SHAY FACEY
Now getting his run in the team, Facey is impressing at both ends of the pitch. He has energy, work-rate and a desire that lasts the full 90 minutes. Defensively he was solid but in attack is where he excelled, creating the first goal with excellent skill. 7
JAMES CLARKE
The captain's return from injury was a welcome one, with the centre-back putting in a composed performance. He brings a calmness and leadership to the side and didn't put a foot wrong against a very tall, strong and physical Cambridge side. 7
MAT SADLER
One of Sadler's best games this season, where he stood up and was counted when it mattered. His impressive performance on Tuesday night was carried into this game and he was vocal from the start, instructing younger players around him. He took his goal well too. 8
CALLUM COCKERILL-MOLLETT
The young defender thoroughly deserved to keep his place in the side after an outstanding showing on Tuesday night. Whether in left-back or in a back three, Cockerill-Mollett seems composed wherever you put him. Another mature display here. 7
RORY HOLDEN
Holden has come under a lot of criticism throughout Walsall's bad run, but his excellent showing in the EFL Trophy was made even sweeter by an equally impressive display in the league. His confidence is visibly growing and when he's playing well, he creates chances. 7
LIAM KINSELLA
Despite only being 23-years-old, Kinsella finds himself as one of the more senior players in a young midfield. Despite that, he's showing the maturity and experience that the team needs. Against Cambridge he was a terrier in midfield and often won the ball back. 8
ALFIE BATES
The teenager is proving himself to be a real player. It's hard to believe this is his first season in men's football, but he has some serious talent. He simply pivots in midfield, effortlessly distributing the ball. But when needed, he's not afraid to get stuck into physical challenges. 7
WES MCDONALD
On Tuesday McDonald was electric for 90 minutes. In this game, he was only that in the second half but it was a stupendous display for 45 minutes. His speed, trickery and skill on the ball is essential to this team. His performance deserved a goal. 8
CAOLAN LAVERY
Walsall desperately missed Lavery during his time on the treatment table, but they're now benefitting from his return. He's the gel that holds together this attack, making forward runs, linking up his team-mates and proving an excellent goal threat. 8
JOSH GORDON
Despite scoring a hat-trick on Tuesday, this was perhaps Gordon's best all-round performance of the season. He's only 5ft 8ins tall but somehow won every header against giant defenders. His strength and hold-up play is deceiving and he ran himself into the ground. There was some luck about his goal, but players create their own luck. 9
Subs: Gaffney (for Lavery 82) 4, Adebayo (for Gordon 87) 5.
Subs not used: Rose, Norman, Jules, Liddle, Hardy.


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