YANCEES: Yet ANother Configurable Extensible Event Service |
| Concepts: | Principles | | Benefits
| |
Design | | Evaluation |
| System: | Implementation | | Documentation | |
In this project, we study the use of configurable and extensible architectures, and their ability to provide versatility to publish/subscribe infrastructures. Our goal is not only to support the development of application-specific publish/subscribe infrastructures, but also to identify design trade-offs and derive a set of software engineering principles to better support infrastructure producers and consumers in the process of building, evolving and (re)using versatile middleware. We evaluate our approach by comparing YANCEES with more traditional versatility strategies implemented by existing publish/subscribe infrastructures.
Current industrial and research infrastructures strive to support application domain variability and evolution by adopting different versatility strategies (see survey on versatility strategies). We define versatility as the ability of software to be used for different purposes in a usable and useful way. Examples of versatility strategies found in both the literature and industry include: (1) Specialization: Build new publish/subscribe infrastructures from scratch to support novel requirement sets; (2) Generalization: reuse minimal generalized publish/subscribe cores such as Siena, Elvin or Scribe; (3) Variation: reuse one-size-fits-all variable infrastructures as CORBA-NS or READY, or more recently, (4) Flexibility: adopting configurable and extensible compositional approaches, as the case with DREAM, FACET, GREEN and YANCEES itself.
In this context, YANCEES is a flexible component framework that allows the construction of application-specific publish/subscribe infrastructures. It supports the customization and extension of its feature set, along main publish/subscribe design dimensions (i.e. event, publication, subscription, routing, notification and protocol models), through the use of plug-ins and extensible languages. Examples of such extensions include advanced event subscriptions, including event correlation; alternate notification policies (push and pull); infrastructure protocols for mobile applications, and ad-hoc P2P protocols; end-user protocols such as event source location and browsing; event persistence services; fast routing cores, and many others.
YANCEES has been extended and configured to support different applications, in different domains, such as Impromptu (a project to study effective security through visualizatins), Vavoom (a visual java virtual machine), and the IC server, a test-bed for the study of contextual collaboration trade-offs. More recently, we are comparing YANCEES compositional approach with other versatility approaches in an empirical study of middleware versatility trade-offs.
Generality. One way to minimize the impact of dependencies, their configuration management costs, and incompatibility problems is to adopt general and fixed data representation. Central features such as the event format, which changes can virtually impact all other variability dimensions, need to be generalized. As such, In YANCEES, the default event model is represented by a tuple-based (attribute/value) abstraction, and the default subscription model is content-based. Generalization broadens reuse, requiring fewer adaptations of existing plug-ins (for the few cases where these models do not apply). As a rule, we use stability (the ratio between incoming and the total dependencies of a design dimension) as the criteria for selecting the dimension to generalize.
Abstraction. The ability to define domain-specific subscription and notification languages support application developers by reducing the cognitive distance involved in the development of event-driven applications. In other words, the ability to extend and configure the subscription and notification languages, as well as the event, routing and protocol models, frees the application developers from tasks associated to data format adaptation and the complexity of implementing domain-specific features.
Reuse. Finally, YANCEES not only supports the reuse of its many components, but can also the reuse of existing infrastructures such as Siena, Elvin and others as a way to achieve interoperability with existing publish/subscribe networks. Another goal of reuse is to leverage on the features provided by existing generalized infrastructures.
Usability. In order to be useful and fulfill its purpose, software must be usable. From the software consumers perspective, the usability in YANCEES is a consequence of the application of abstraction, separation of concerns and automation. Abstraction comes from the use of high-level subscription and notification languages, and a simple client-side API that hides from the users concerns related to: the runtime selection, initialization and configuration of components that implement the features required by end-users. The ability to hide these concerns from the end-users comes from the application of automation. Finally, separation of extension and usage concerns provide multiple interfaces to support both infrastructure developers and infrastructure users.
Simplicity. Complexity is the major source of problems in software development. Approaches that minimize complexity result in more efficient, evolvable, less prone to errors solution. In order to escape the one-size-fits-all syndom where the addition of many variables in the system increases its complexity, configuration costs and even affect its performance, YANCEES is built as a simple core around which different extensions and optional plug-ins are installed.
The application of these principles, while increasing the infrastructure versatility, come at the expense of extra complexity due to the following facts: 1) The different publish/subscribe concerns are not orthogonal. In other words, they participate in the process of publishing, routing and notifying events, which define implicit semantic data and control dependencies between these components. For example, the use of a global event representation, and assumptions about event frequency, creates oportunities for feature interaction. 2) Moreover, complex features are built from a combination of different components, that need to communicate, defining explicit dependencies between different parts (and components) of the system. 3) The dynamic characteristic of the publish/subscribe model require additional support for run-time allocation of components in response to client's needs. 4) Finally, the reuse of existing infrastructures require support for adaptation. In order to address requirements, the following strategies are adopted in YANCEES:
Automation of user interaction and infrastructure build process (static variability management). Even though the different concerns of publish/subscribe systems can be separated into different variability dimensions. It is usually the case that these concerns are not completely orthogonal. In other words, components are implemented in the context of a predefined configuration. As a result, changes in one dimension may affect other dimensions. For example, content-based subscription is directly dependent on the event format; advanced event processing (for e.g. sequence detection), is dependent on timing assumptions induced by different routing protocols, filters and subscription languages. If not properly enforced and documented, changes in apparently unrelated features may interfere with each order. As a consequence these fundamental problem dependencies must be adequately managed. Two main strategies are adopted to manage these issues: indirection, documentation and automation.
Dynamism (dynamic variability management). Publish/subscribe infrastructures are inherently interactive. Subscriptions are user-defined logical expressions on the order or content of events. As such, they are directly dependent on the features provided by the infrastructure. Subscriptions are also dynamic, being posted and removed at runtime by different users. Hence, In order to support the many possible combinations of features a server may have, and the intrinsic interactivity of the publish/subscribe model, YANCEES support runtime loading and assembling of features. A valid subscription is a word in the subscription language installed in YANCEES, and can be expressed in terms of different commands.Hence, subscriptions are used to orchestrate the composition of plug-ins at runtime. This strategy not only copes with configurability and customization, by also supports the co-existence of different feature sets in the same infrastructure, for example: content-based and fast topic-based subscriptions can be supported, at the same time in YANCEES. Finally, this strategy promotes a more rational allocation of resources: features are loaded on demand, copying with more restricted environments such as PDAs.
Reflexive Architecture. A consequence of the different data and control dependencies between the publish/subscribe variability dimensions is that complex features are usually implemented by the combination of different plug-ins. For example, event persistence, mobility protocols and others. Since most of these plug-ins are dynamically allocated, they need to locate each other, at runtime, in order to communicate. As a consequence, YANCEES supports runtime plug-in location through the use of a plug-in registry. A plug-in registry provides a single point of access to all the active components in the infrastructure. It supports name-based access to active plug-ins, at any given moment in time.
Support for Adaptation. The optional reuse of existing infrastructures such as Siena and Elvin as a way to achieve interoperability or to reduce the development costs associated to the routing model, requires means to convert YANCEES internal model (event representation, subscription and notification languages) to existing infrastructures. In YANCEES this is achieved by the use of adapters in the dispatcher model.
Support for Different Interfaces. Infrastructure users and infrastructure developers have different needs with respect to the way they must interact with the infrastructure. While the users are interested in selecting and utilizing the features provided by the infrastructure. Developers are interested in extending and configuring the infrastructure to meet different user needs. In the support for these different roles, YANCEES provides different interfaces. The goal is to simplify the interaction with the system exposing only the necessary API to each king of user. The supported APIs are: Publication and Subscription API, used by application developers; and the Extension and Configuratoin API used by the develpers. Strategy selection is implicitly supported by the subscription language, at runtime, which allows subscribers to select different commands according to their need. For example: content-based or topic-based filtering.
Internally, YANCEES is provide a set of component frameworks that combine:
A component framework defines standard interfaces, composition mechamisns and common data representations. YANCEES has specific component models for each one of its variability dimensions. Threee major composition mechanisms and interfaces are defined. The communication between plug-ins in the subscription, notification and routing models is achieved by the use of the listener design pattern; by the pipe-and-filter design pattern in the case of input and output filters; and by standard interfaces in the case of services and dispatchers. Subscription and Notification plug-ins are therefore composed with one another by registering themselves as each other's listeners; whereas filters are composed by connecting their standard input with a standar output of other filter. Services do not prescribe any particular interface. Their integration with other components is mediated by the plug-in registry component, that permits different pllug-ins to locate each other by name references. In most of the cases, however, the composition process is automated. For example, subscription and notification plug-ins are composed, at runtime, through a subscription parsing engine, according to the provided subscription/notification expression which is defined according to the grammar rules of subscription and notification languages. Finally, the event model is extensible. Events are generic objects, which methods and/or content must be especialized by YANCEES users.1. Dynamic parsers that allocate plug-ins according to user-provided subscriptions subscription and notification commands.
2. Input and output publication filters as a way to intercept event publication and implement global policies and filters.
3. Special static plug-ins that implement services, for example: mDNS and persistence
4. Configuration managers, dynamic parsers and builders that orchestrate the integration of different components at load time and runtime.
5. Adapters that can support existing publish/subscribe infrastructures, for ex: Siena, Elvin and custom-made cores
6. A set of component frameworks that provides interfaces and composition rules on the different variation points.
In sum, the unifying composition approach adopted by YANCEES component model is the listener pattern. Components are both producers and consumers of event, allowing multiple consumers to listen to existing components. Components also have a management interface that allow their runtime composition into listener hierarchies.
Figure2. General YANCEES architecture with plug-ins (in red) and main extension/variation points and APIs (in blue)
The
YANCEES prototype was
implemented and tested with Java (J2SDK1.4.2 and WSDP1.2 - which
provides XMLSchema validation support for the DOM parser). Currently,
the framework supports
the core mechanisms presented in the previous sections: input and
output filters, subscription, notification and protocol plug-ins, and
shared services, which can be configured at boot time with the use of
configuration description files. The system was ported to work using
Siena and
Elvin. It also supports our own fast topic-based dispatcher. The
communication between client stubs and the
server
is implemented using Java RMI protocol.
The
following plug-ins are
implemented: event sequence
detection, pull and push notification policies, polling protocol, a
simple
persistence service (in memory), a fast multiplexer dispatcher
(topic-based), and many other features.
The
service is multi threaded and
supports many simultaneous subscriptions and publications as
non-blocking operations. Input and output buffers were implemented to
improve overall throughput and performance.
More current source code is available
in the CVS
repository.
Examples,
installation
instructions, user
manual and configurations are under construction at the YANCEES
manual page (under construction).
This
software is distributed
according to the following LICENSE.TXT.
This software was tested with J2SDK1.4.2
and
Java API for XML processing available at SUN
WSDP1.2 (web services pack) or higher.
For your
convenience, we provide some examples of YANCEES bundled in different
configurations. Those bundles include only a YANCEES-SNAPSHOT.jar file
with the publisher and subscriber source codes. windows and
Unix shell
scripts are provided as well as the configuration file used to
customize YANCEES.
Minimal YANCEES:
(August 2006 snapshot)
Configured with a fast switch core, the subscription language has only
one command, <require>,
which filters messages with the specified attribute name.
Siena YANCEES:
(August 2006 snapshot)
Configured with Siena as the routing core, it provides Siena
configuration language with an extra sequence detector plug-in. This is
the version used in our example above.
August 2009 - The fourth stable public release of the YANCEES prototype is available. Previous releases can be downloaded here. The Java implementation of the prototype can be downloaded as follows:
This version supports:
Roberto
Silveira Silva Filho
Irvine, CA. August 15th, 2009.
| 2007 - Silva Filho, R. S. and D. F. Redmiles. Managing Feature Interaction by Documenting and Enforcing Dependencies in Software Product Lines. in proceedings of the 9th International Conference on Feature Interactions in Software and Communication Systems. pp.39-54, Grenoble, France, September 3-5, 2007. |
| 2005 - Silva Filho
R. S., |
| 2005 - Silva Filho R. S., Redmiles D. F. A Survey of Versatility for Publish/Subscribe Infrastructures. Technical Report UCI-ISR-05-8. University of California, Irvine, May 2005. |
| 2004 - Silva Filho R. S., Redmiles D. F. Preserving Versatility in Event-based Middleware. Technical Report UCI-ISR-04-7. University of California, Irvine, October 2004. |
| 2004 - Silva Filho R. S., De Souza C. R. B., Redmiles D. F. Design and Experiments with YANCEES, a Versatile Publish-Subscribe Service. Technical Report UCI-ISR-04-1. University of California, Irvine, April 2004. |
| 2003 - Silva Filho R. S., De Souza C. R. B., Redmiles D. F. The Design of a Configurable, Extensible and Dynamic Notification Service. in Proc. Second International Workshop on Distributed Event-Based Systems (DEBS'03), In conjunction with The ACM SIGMOD/PODS Conference, San Diego, CA, USA, June 8th, 2003. |
Additional materials |
| Slides from the ICFI 2007 conference are available here. |
| |
| Slides from the SEM 2005 workshop are available here. |
| Slides from the DEBS 2003 workshop are available here. |
| |
| Current YANCEES
Brochure is available here. |
| |
| YANCEES Poster presented in the ISR Internal Workshop, June 2004 is available here. |
This research has been sponsored by NSF (grants 0133749, 0205724, 0326105, 0527729,0524033), an IBM Eclipse technology exchange grant, and the Intel Corporation.


Persisto Learn is born out of gratitude for those who came before us, who gave freely of their time and knowledge to empower and enrich the lives of young people. It is with this gratitude we work to provide opportunities for youth in places less visited, where passion and creativity shine bright regardless of resources.
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When using layout grids for building full-level layouts, it may make sense to apply responsive web design (RWD) principles to ensure that the layout adapts to a wide range screen widths.
The simplest form of responsive behavior swaps from a stacked layout on narrow screens like a smartphone to the multi-column grid layouts at wider screens. This can be done by targeting styles to specific screen widths by using CSS media queries.
By default, the grid classes will result in a multi column layout across all screen widths. The styles to make the grids responsive are added by applying a media query with rules to switch to the stacked style presentation below a specific screen width.
We normally recommend starting with mobile-first approach for media queries: starting with the styles that apply to the smallest screen sizes in the core widget styles, then progressively layering breakpoints up to larger screens by using min-width
media queries.
However, in the case of grids we can use a max-width
media query to only apply the stacked grid styles below a width breakpoint. This allows us to leverage all the default grid styles but just tweak them at narrow widths.
Without the custom styles, our grid will be a 3 column layout across all screen widths:
In our custom styles, we want this grid to stack at narrow widths, then switch to a standard 3 column layout. At very wide screen widths, we want first column to take up 50% of the width, like this:
To make this responsive, start by adding the my-breakpoint
class to the grid container that references the custom breakpoint in your custom stylesheet:

Block A

Block B

Block C

This class is used to scope the styles within the custom media query so they will only apply when this class is added to the grid container. The media query wraps the conditional styles we only want applied below 50em.
In your media queries, use em units instead of pixels to ensure that the media query will take font size into account in addition to just screen width. To calculate a screen widths in ems, divide the target width in pixels by 16 which is the default font size of the body.
@media all and (max-width: 50em) {
.my-breakpoint .ui-block-a,
.my-breakpoint .ui-block-b,
.my-breakpoint .ui-block-c,
.my-breakpoint .ui-block-d,
.my-breakpoint .ui-block-e {
width: 100%;
float:none;
}
}
Within this media query, we set the width to 100% and negate the float property to make the grid blocks stack below 50em screen widths. These rules are applied to every grid type by stacking up selectors for all the grid classes from ui-block-a
to ui-block-e
on the styles.
That is all it takes to make grids responsive and it's easy to add additional styling rules to each breakpoint to change it up even more. We encourage you to create as many custom breakpoints as you need based on your unique content and layout needs.
Building on the example above, we can add an additional breakpoint to shift the widths to make the first column 50% width and the other two 25% above 75em (1,200 pixels) by layering an additional min-width
media query to tweak widths in our custom style like this:
@media all and (min-width: 75em) {
.my-breakpoint.ui-grid-b .ui-block-a { width: 49.95%; }
.my-breakpoint.ui-grid-b .ui-block-b,
.my-breakpoint.ui-grid-b .ui-block-c { width: 24.925%; }
.my-breakpoint.ui-grid-b .ui-block-a { clear: left; }
}
}
Note the slightly narrower widths set to work around rounding issues across platforms.
Even though we strongly encourage you to write custom breakpoints yourself, the framework includes a single pre-configured breakpoint that targets the stacked style to smaller phones and swaps to the multi-column presentation on larger phones, tablet and desktop devices.
To use this preset breakpoint, add the ui-responsive
class to the grid container to apply the stacked presentation below 560px (35em). If this breakpoint doesn't work for your content, we encourage you to write a custom breakpoint as described above.

These are standard grids that are made responsive by ui-responsive
class to the grid container:


Did you know that the city-build map will show you what each city is building, and how many turns until it is completed?
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Upgrading from DWR version 2.0 to DWR version 3.0
If you are upgrading from a version prior to 2.0, see the full upgrade notes.
DWR 3.0.0 is a major release containing hundreds of bug fixes. The list below may not be exhaustive. If you run into issues not reported here please let us know on the dwr-users mailing list.
These are the changes that you must make to upgrade from version 2.0 to version 3.0:
- Starting with DWR 3.0 RC2 engine.js must be included before the DWR interface JavaScript files.
- For DWR 1.x the Javascript libraries had the prefixes DWREngine and DWRUtil. These were deprecated in version 2.0 in favor of dwr.engine and dwr.util. In version 3.0, the prefixes DWREngine and DWRUtil have been removed. The best way to upgrade is to change all code to use the new method. Alternatively you can use the two-liner:
DWREngine = dwr.engine; DWRUtil = dwr.util;
to re-enable the old behavior.
- Starting with DWR 3.0 RC2 if you are using Jetty 6 with reverse AJAX you will need to either upgrade to Jetty 7+ or follow the directions here: http://www.butterdev.com/dwr/2010/01/dwr-3-x-and-jetty-continuations-on-jetty-6-x/. Due to changes in the Jetty Continuation API.
- Starting with DWR 3.0 RC3 full streaming is now the default for browsers that support it. Use the maxWaitAfterWrite setting if desired to go back to Early Close Mode for all connections.
- DOMConverters - If you are using a DOMConverter (DOM4JConverter.java, DOMConverter.java, JDOMConverter.java or XOMConverter.java) it will now return either an Element or a Document based on the type of data. Prior to 3.x a DOMConverter always returned a Document.
- Spring Schema Change - Creator configuration is no longer allowed inside the dwr:configuration element. Please see this discussion on the mailing list for more information.


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|
libode
Easy to compile, fast ODE integrators as C++ classes
|
Base class for Rosenbrock methods. More...
#include <ode_rosenbrock.h>
Public Member Functions | |
| OdeRosenbrock (unsigned long neq, int nk) | |
| constructs More... | |
| ~OdeRosenbrock () | |
| destructs | |
Protected Member Functions | |
| void | prep_jac (double **Jac, unsigned long n, double dt, int *p) |
| do necessary arithmetic with the Jacobian then lu factor it More... | |
Protected Attributes | |
| double | gam |
| parameter multipying Jacobian or single diagonal gamma | |
| int * | p_ |
| permutation array for LU factorization | |
| double * | rhs_ |
| right hand side of matrix equations | |
| double * | soltemp_ |
| temporary sol vector | |
| double ** | k_ |
| stage derivatives | |
Base class for Rosenbrock methods.
Definition at line 9 of file ode_rosenbrock.h.
| OdeRosenbrock::OdeRosenbrock | ( | unsigned long | neq, |
| int | nk | ||
| ) |
constructs
| [in] | neq | size of ODE sytem |
| [in] | nk | number of stages |
Definition at line 5 of file ode_rosenbrock.cc.
|
protected |
do necessary arithmetic with the Jacobian then lu factor it
| [in] | n | size of Jacobian |
| [in] | Jac | Jacobian matrix then LU decomposed Jacobian with modifications for Rosembrock stages |
| [in] | dt | time step size |
| [out] | p | permutation array for LU decomposition |
Definition at line 28 of file ode_rosenbrock.cc.


Student Name :
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I think it's a good way of looking at the design side of this at the moment. You could sepnd sooo many hours on this changing the layout, fonts, colours, images etc so its good to be able to just go ok this is functional i can leave it for now
I liked the idea of meditation to clear your mind. I have used it in the past to help get to sleep and have found it works really well.
That its not just about being relaxed it has an ephasis on you also being alert. I liked the analogy with physical activity and how its training your mind.
The extended mindfulness seems like my preferred option.


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The different watch colors.
| Enumerator |
|---|
| WATCH_INFO_COLOR_UNKNOWN | Unknown color.
|
| WATCH_INFO_COLOR_BLACK | Black.
|
| WATCH_INFO_COLOR_WHITE | White.
|
| WATCH_INFO_COLOR_RED | Red.
|
| WATCH_INFO_COLOR_ORANGE | Orange.
|
| WATCH_INFO_COLOR_GRAY | Gray.
|
| WATCH_INFO_COLOR_STAINLESS_STEEL | Stainless Steel.
|
| WATCH_INFO_COLOR_MATTE_BLACK | Matte Black.
|
| WATCH_INFO_COLOR_BLUE | Blue.
|
| WATCH_INFO_COLOR_GREEN | Green.
|
| WATCH_INFO_COLOR_PINK | Pink.
|
| WATCH_INFO_COLOR_TIME_WHITE | Time White.
|
| WATCH_INFO_COLOR_TIME_BLACK | Time Black.
|
| WATCH_INFO_COLOR_TIME_RED | Time Red.
|
| WATCH_INFO_COLOR_TIME_STEEL_SILVER | Time Steel Silver.
|
| WATCH_INFO_COLOR_TIME_STEEL_BLACK | Time Steel Black.
|
| WATCH_INFO_COLOR_TIME_STEEL_GOLD | Time Steel Gold.
|
| WATCH_INFO_COLOR_TIME_ROUND_SILVER_14 | Time Round 14mm lug size, Silver.
|
| WATCH_INFO_COLOR_TIME_ROUND_BLACK_14 | Time Round 14mm lug size, Black.
|
| WATCH_INFO_COLOR_TIME_ROUND_SILVER_20 | Time Round 20mm lug size, Silver.
|
| WATCH_INFO_COLOR_TIME_ROUND_BLACK_20 | Time Round 20mm lug size, Black.
|
| WATCH_INFO_COLOR_TIME_ROUND_ROSE_GOLD_14 | Time Round 14mm lug size, Rose Gold.
|
| WATCH_INFO_COLOR_PEBBLE_2_HR_BLACK | Pebble 2 HR, Black / Charcoal.
|
| WATCH_INFO_COLOR_PEBBLE_2_HR_LIME | Pebble 2 HR, Charcoal / Sorbet Green.
|
| WATCH_INFO_COLOR_PEBBLE_2_HR_FLAME | Pebble 2 HR, Charcoal / Red.
|
| WATCH_INFO_COLOR_PEBBLE_2_HR_WHITE | Pebble 2 HR, White / Gray.
|
| WATCH_INFO_COLOR_PEBBLE_2_HR_AQUA | Pebble 2 HR, White / Turquoise.
|
| WATCH_INFO_COLOR_PEBBLE_2_SE_BLACK | Pebble 2 SE, Black / Charcoal.
|
| WATCH_INFO_COLOR_PEBBLE_2_SE_WHITE | Pebble 2 SE, White / Gray.
|
| WATCH_INFO_COLOR_PEBBLE_TIME_2_BLACK | Pebble Time 2, Black.
|
| WATCH_INFO_COLOR_PEBBLE_TIME_2_SILVER | Pebble Time 2, Silver.
|
| WATCH_INFO_COLOR_PEBBLE_TIME_2_GOLD | Pebble Time 2, Gold.
|
| WATCH_INFO_COLOR_UNKNOWN | Unknown color.
|
| WATCH_INFO_COLOR_BLACK | Black.
|
| WATCH_INFO_COLOR_WHITE | White.
|
| WATCH_INFO_COLOR_RED | Red.
|
| WATCH_INFO_COLOR_ORANGE | Orange.
|
| WATCH_INFO_COLOR_GRAY | Gray.
|
| WATCH_INFO_COLOR_STAINLESS_STEEL | Stainless Steel.
|
| WATCH_INFO_COLOR_MATTE_BLACK | Matte Black.
|
| WATCH_INFO_COLOR_BLUE | Blue.
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| WATCH_INFO_COLOR_GREEN | Green.
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| WATCH_INFO_COLOR_PINK | Pink.
|
| WATCH_INFO_COLOR_TIME_WHITE | Time White.
|
| WATCH_INFO_COLOR_TIME_BLACK | Time Black.
|
| WATCH_INFO_COLOR_TIME_RED | Time Red.
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| WATCH_INFO_COLOR_TIME_STEEL_SILVER | Time Steel Silver.
|
| WATCH_INFO_COLOR_TIME_STEEL_BLACK | Time Steel Black.
|
| WATCH_INFO_COLOR_TIME_STEEL_GOLD | Time Steel Gold.
|
| WATCH_INFO_COLOR_TIME_ROUND_SILVER_14 | Time Round 14mm lug size, Silver.
|
| WATCH_INFO_COLOR_TIME_ROUND_BLACK_14 | Time Round 14mm lug size, Black.
|
| WATCH_INFO_COLOR_TIME_ROUND_SILVER_20 | Time Round 20mm lug size, Silver.
|
| WATCH_INFO_COLOR_TIME_ROUND_BLACK_20 | Time Round 20mm lug size, Black.
|
| WATCH_INFO_COLOR_TIME_ROUND_ROSE_GOLD_14 | Time Round 14mm lug size, Rose Gold.
|
| WATCH_INFO_COLOR_PEBBLE_2_HR_BLACK | Pebble 2 HR, Black / Charcoal.
|
| WATCH_INFO_COLOR_PEBBLE_2_HR_LIME | Pebble 2 HR, Charcoal / Sorbet Green.
|
| WATCH_INFO_COLOR_PEBBLE_2_HR_FLAME | Pebble 2 HR, Charcoal / Red.
|
| WATCH_INFO_COLOR_PEBBLE_2_HR_WHITE | Pebble 2 HR, White / Gray.
|
| WATCH_INFO_COLOR_PEBBLE_2_HR_AQUA | Pebble 2 HR, White / Turquoise.
|
| WATCH_INFO_COLOR_PEBBLE_2_SE_BLACK | Pebble 2 SE, Black / Charcoal.
|
| WATCH_INFO_COLOR_PEBBLE_2_SE_WHITE | Pebble 2 SE, White / Gray.
|
| WATCH_INFO_COLOR_PEBBLE_TIME_2_BLACK | Pebble Time 2, Black.
|
| WATCH_INFO_COLOR_PEBBLE_TIME_2_SILVER | Pebble Time 2, Silver.
|
| WATCH_INFO_COLOR_PEBBLE_TIME_2_GOLD | Pebble Time 2, Gold.
|


--- layout: archive title: Zulip Chat Archive permalink: /stream/187724-concrete-semantics/topic/Status.20report.html ---
How far have people come? I'm done with chapter 3
@Harrison Grodin Hi! Here is the stream I was telling you about earlier
BTW the parts on operational semantics, Hoare logic, and denotational semantics were the inspiration for the corresponding parts in our Lean course. The porting was done by Johannes Hölzl. You'll find our files here, in "lean/love{08,09,10}*.lean":
https://github.com/blanchette/logical_verification_2019
And our still rapidly evolving lecture notes at
https://github.com/blanchette/logical_verification_2019/blob/master/logical_verification_in_lean.pdf
Thanks!
{% endraw %}Last updated: Apr 24 2020 at 19:02 UTC


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( a) Schematic of a piece of silicene of N atoms (red balls) lying on the surface of a Ag(111) substrate of M atoms (blue balls) at temperature T and ( b) the potential energy felt by a Si atom (shown in the black box) moving along the X-, Y-, or Z-axis.


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HTML Color Groups
Color Names Sorted by Color Groups
All modern browsers support the following 140 color names (click on a color name, or a hex value, to view the color as the background-color along with different text colors):
Click here to see the 140 colors sorted by Name
Click here to see the 140 colors sorted by HEX Value


I worked at Gusto in San Francisco, CA, from October 2019 until October 2021.
(That's Vincent, sitting at my desk.)
Gusto's San Francisco office is on historic Pier 70, in the old machine shop of Bethlehem Shipbuilding's Union Iron Works shipyard.  The Historical Society wouldn't let us play with it, though. :-(
I only got to enjoy this office for a few months before the COVID-19 pandemic forced us all to work from home, starting in March 2020.


--- layout: default ---
The MEOM team contributes to the organisation of various scientific events:
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En savoir plus


I am a paragraph with a tooltip. ⓘ Good News, I'm inside a paragraph! I have a link and you can tab to me without closing me!
The tooltip is inside the heading element and does not take the base style within the slot.
You can pretty much put anything you want into the default slot so much as it is not an interactive component.


We provide a professional renovation and installation services with a real focus on customer satisfaction. Our installations are carried out by fully trained staff to the highest professional standards.
You can hire us for 24 x 7 housekeeping and cleaning services. We charge affordable prices for our services and guarantees 100% customer satisfaction. We are well-equipped with all the tools that we bring with us whenever we go to any space for housekeeping services.
Housekeeping, Facility Management, Building Maintenance, Horticulture
Mr. Bijay Kumar Sahoo
Applauds our hard working lab supporting staff members and shares a good feedback.
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In addition to the ioctl(2) requests supported by the device that tty refers to, the ioctl(2) request TIOCNOTTY is supported.
If the process is the session leader, then SIGHUP and SIGCONT signals are sent to the foreground process group and all processes in the current session lose their controlling tty.
This ioctl(2) call works only on file descriptors connected to /dev/tty. It is used by daemon processes when they are invoked by a user at a terminal. The process attempts to open /dev/tty. If the open succeeds, it detaches itself from the terminal by using TIOCNOTTY, while if the open fails, it is obviously not attached to a terminal and does not need to detach itself.


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The faster windmills are observed to rotate, the more wind is observed to be.Therefore wind is caused by the rotation of windmills.
Using causal inference requires
caution
We want to gather evidence for a causal link between a change and behaviour
Correlation is not sufficient for supporting decision making
Direction of effect is as important as showing there is a relation at all
What we want to know (Rubin Causal Model)
The fundamental problem of
causal inference
We cannot sample the entire population
We cannot expose units to both treatments exclusively
We cannot directly observe underlying probabilities
What we can measure (Rubin Causal Model)
We will try to answer two
key questions
Is there any causal effect?
What is the size of the causal effect?
(If the size is non-zero, there is an effect.)
What randomization gives us (Rubin Causal Model)
Repeating the same experiment (Expectation)
Our answers will be correct
in expectation
If we show A and B to random samples of the population,then on average the fraction of yes in both groups will be equal to the true underlying means,and on average the difference between the means will be equal to the average treatment effect
Up, down or neither?(I don't know either)
Randomization ensures only three things can
explain a difference
Causation resulted in people behaving differently when treatment was applied
Pure chance resulted in a difference between the two groups unrelated to the treatment
Measurement error resulted in an unintended difference in results unrelated to user behaviour
We want to reject the
null hypothesis
The null hypothesis assumes no difference between treatment and control; any difference we observe is simply due to chance.
If we could reasonably rule out chance and measurement error, we might reject the null and consider this to be evidence for the alternative hypothesis.
We compute a
p-value
We assume the null hypothesis is true and compute the p-value.
Assuming there is no effect, the p-value is the probability of seeing a particular result or more extreme by chance.
How likely is this result assuming the null is true?
Are these dice
Fair?
⚅⚅⚅
p = 0.00462962(Not fair; I cheated)
We need to pick a
threshold
How many 6's are we willing to accept before questioning the dice fairness?
Scientific standard for significance: p < 0.05
p-values are
tricky
Assuming there is no difference between two groups that you have tested, which p-value do you think is more likely:p=.009 or p=.900?They are equally likely!
under the null hypothesis, p-values are
uniformly distributed
P-values indicates how likely that result should be observed assuming the null hypothesisTherefore 5% of the experiments should fall below p=.05And 0.1% will have p=.009 and p=.900
Null hypothesis simulated
Normal scenario simulated
some have an effect, others don't
Low to High % alternatives
what is going on here?
p-values are often[2]
misinterpreted
Some examples of incorrect interpretations
p = .05 means the null hypothesis has only a 5% chance of being true
A non-significant difference (e.g. p > .05) means there is no difference between groups
p = .05 means that we have observed data that would occur only 5% of the time under the null
p = .05 means that if you reject the null, the probability of a type I error (false positive) is 5%
[2] Goodman, Steve 2008. “A dirty dozen: twelve P-value misconceptions.” Seminars in Hematology, 45 (2008), pp. 135-140.
Two types of
errors
Type-I is the incorrect rejection of a true null hypothesis; we detected an effect when there was none
Type-II is the failure to reject a false null hypothesis; we failed to detect a real effect
Repeating the same experiment (No effect)
Repeating the same experiment (No effect)
Repeating the same experiment (Small effect)
The importance of
Statistical power
Statistical power is the probability that the test correctly rejects the null hypothesis when the alternative hypothesis is true
Two main things affect statistical power:
Sample size (more is better)
Effect size (more is better)
Repeating the same experiment (More power)
Repeating the same experiment (Even more power)
Repeating the same experiment (MOAR POWER!!11)
The importance of sticking to
Protocol
The methods described assume strict adherence to protocol;violations of protocol such as peeking and multiple testing increase the type-I error rate
Can these dice be influenced by
telekinesis?
p = 1(Fair dice; I still cheated)
Repeating the same experiment (Peeking twice)
Repeating the same experiment (Peeking 100x)
Reasons for violating
Protocol
More flexible protocols may be desirable
early stopping rules to mitigate damage
early shipping to minimize opportunity cost
multiple variants to test several alternatives
multiple metrics to guard business KPIs
All these are possible[4], but require protocol adjustments
[4] Alex Deng, Tianxi Li, Yu Guo 2014 “Statistical Inference in Two-Stage Online Controlled Experiments with Treatment Selection and Validation” WWW '14. 609–618.
Design of experiments
Statistical foundations for causal inference
Credits to Lukas Vermeer is Senior Product Owner for Experimentation at Booking.com
Rubin, Donald B. 1974. “Estimating Causal Effects of Treatments in Randomized and Nonrandomized Studies.” Journal of Educational Psychology 66 (5): 688–701. (link)
Goodman, Steve 2008. “A dirty dozen: twelve P-value misconceptions.” Seminars in Hematology, 45 (2008), pp. 135-140. (link)
Kohavi, R., Longbotham, R., Sommerfield, D. et al. 2009 “Controlled experiments on the web: survey and practical guide” Data Min Knowl Disc (2009) 18: 140. (link)
Alex Deng, Tianxi Li, Yu Guo 2014 “Statistical Inference in Two-Stage Online Controlled Experiments with Treatment Selection and Validation” WWW '14. 609–618.(link)
Robinson, Davis "Interpreting p-value Histograms"(link)


If you wait a bit longer you can claim from ledger #dex-hyperdex is working on support to claim from ledger
Danny__05-Nov-18 08:58 PM
Would be great
peritonlogon05-Nov-18 11:48 PM
I have a modest amount of different coins that work with barterdex/hyperdex. I would like do some 24/7 liquidity providing . What would be the easiest way? I have a server at home that can run 24/7.
Komodo (KMD) is a decentralised, open-source cryptocurrency. It was launched in September 2016 and has evolved from BitcoinDark (BTCD) and is developed by th...
2
Multi2106-Nov-18 10:37 AM
o/
DLT Novice06-Nov-18 02:04 PM
is there still any attention to CHIPS?
jl777c06-Nov-18 02:06 PM
sg777 has had some personal issues, so it has slowed down but he is eager to get back in gear
@SatoriNakamoto if you hadnt happened to sign up yet, this is the referral from the team, any profits go to the project funds :
https://digitalprice.io/?inviter=4fdaf7
1
Torankoku07-Nov-18 12:39 AM
excellent job with erc-20 integration to agama guys! Keep up the good work
4
7
nille07-Nov-18 08:39 AM
good day everyone
CryptoNinjaa07-Nov-18 08:46 AM
!👽▂▅▆▇ Thorth ▇▆▅▂👽07-Nov-18 09:10 AM
since i'm desperate... anyone here know some JAVA ?????
Whoever makes the first real, usable, simple DEX will be a legend.
Some of them are alright, but nothing that I am beyond impressed with yet. Love IDEX, but now they are implementing KYC. ♂
Any coming out that you are aware of?
Whoever makes the first real, usable, simple DEX will be a legend.
Some of them are alright, but nothing that I am beyond impressed with yet. Love IDEX, but now they are implementing KYC. ♂
Any coming out that you are aware of?
Likes
107
Masterroshi07-Nov-18 05:47 PM
please anyone share with me your knowledge of how to use barterdex. Reliable links etc
Still there are some other guides after this one that you can find in our knowledgebase... but still if this is your first time doing atomic swaps you can also use Hyperdex
it's more user friendly
it uses the same engine as Barterdex but has a simplier User interface
Komodo OKEx or Huobi ? Or even there are no such plans ?
TCA08-Nov-18 12:46 AM
hi guys
I was wondering how your coin compares to say raven coin
with it's asset creation
Zoroaster08-Nov-18 01:54 AM
I'm excited for V44 of Agama. However going through the list of included ERC20 tokens, I don't see PayPie (PPP). Does anyone know how the ERC20 list was chosen and if so, why PPP isn't included?
Alright08-Nov-18 02:22 AM
the list is based off of which ERC20s were already in barterdex
LarryBird08-Nov-18 06:16 AM
@Zoroaster because it's called paypie
twistedmind08-Nov-18 06:52 AM
why no rewards in agama wallet?
modereck08-Nov-18 07:34 AM
@twistedmind minimun 10 kmd and wait 1 hour to see the reward
jon00808-Nov-18 09:08 AM
is the bot available for withdrawal? thank you
Cryptoon08-Nov-18 09:27 AM
#tip-bot
twistedmind08-Nov-18 10:27 AM
@modereck i have well over that amount. havent received rewards since sept 12
snowdamn08-Nov-18 10:46 AM
is rebranding/new marketing waiting for scaling test or another milestone to be completed?
timing can be very tricky in crypto, so concerned
Daniel CP08-Nov-18 11:15 AM
@snowdamn the rebrand is well under way and we're currently working with Ideas By Nature on a new logo, new typeface, new color palette. We're also getting ready to update the website while also working on a brand new website with mew messaging, the new visual identity and logo, and a new layout. It's not really dependent on the scaling test, the process just takes time.
twistedmind08-Nov-18 11:15 AM
why rebranding? how about finishing what you started
Daniel CP08-Nov-18 11:15 AM
The Dev team is working with AWS to prepare and schedule the big scaling test
So that is also under way but not related to the rebrand
@twistedmind what do you mean?
We're rebranding to improve the messaging, the logo and visual identity, build a new website, create a new GUI for Agama, and generally improve our presence and perception in the crypto space
twistedmind08-Nov-18 11:17 AM
it just seems that jl777 projects are always on the "next" thing without completing anything
Daniel CP08-Nov-18 11:17 AM
In the past, Komodo's brand has been very convoluted and hard to understand-- is Komodo a privacy coin? an atomic swap DEX? a dICO platform? or what?
twistedmind08-Nov-18 11:17 AM
nxt-btcdark-komodo-iguana-all the failed icos-arrr
2
4
1
1
Daniel CP08-Nov-18 11:17 AM
We're trying to create powerful messaging that helps people easily understand Komodo


Stack Chart
Theft data from 2001 - 2018, THEFT OVER $500 and THEFT $500 AND UNDER
Line chart
Assault cases over 2001 - 2018, aggregated on whether the crime resulted in an arrest or not


About me
Biography
Sahar Zahran a telecommunication engineer graduated form Al Balqa'a Applied university
also a mathematichs teacher for
a year in a private school, before couple of years,
I had my first online business in digital marketing.
I have a desire and passion to learn programming, I have learnt java the last year,
and I am on my way to be a web developer.
Hometown
Zarqa/Jordan.
Education
- Telecommunication Engineering / Al Balqa'a Applied university.
- Up skilling program / Al Hussien Technical University
- Java programing language
- English language
- Soft Skills
Experiment
- Digital Marketing: Private Business.
- Teaching : Private School.
Goals
I am working to be a proficient web developer.
Top ten
The most dangerous places in the world:
- Death Valley, USA.
- The Danakil Desert, Eritrea.
- Mount Washington, USA.
- Sinabung Volcano, Indonesia.
- (Snake Island), Brazil.
- Madidi National Park, Bolivia.
- Valley of Death, Kamchatka, Russia.
- Bikini Atoll, The Marshall Islands.
- Elephant Kingdom in Chonburi, Thailand.
- Afar Depression, Ethiopia.


Owner of
this site,
currently working for
this company,
former Senior Software Engineer at
this company,
look what
I can do,
contact me
here
or read stuff I write
here.


First time here? Learn more about semtag.
Semtag is a site that stores bookmarks as entities. Each entity must have a type, similar to a category. Unlike a category, a type is meant to specifically model how we view the world and answer "What is this thing? Is it an article, app, song, clip, etc. ?". For example, here is my bookmark for google which is a company type. The types can be any value and thus allows you to model your knowledge. For example, these are my types.
Semtag uses tagging as a means of organizing bookmarks, much like previous bookmarking sites e.g. delicious.com. With these older sites, tags mainly served to create a list of things e.g. google things and little importance was given to the tag itself. In semtag, tags are as important as the entities they are tagging; they are entities themselves. This means that tags are not just creating lists, they are creating relationships between entities. For example, google is an entity that has this related (tagged) list of articles, products, libraries, etc.
By treating bookmarks as entities, letting you create any types for them and freely associate between them, semtag provides a powerful way to organize and grow your taxonomy.


The theme offers 14 additional colour schemes (15 in total including the default green):
- Green:
#55A79A;
- Red:
#BE3E1D;
- Purple:
#b771b0;
- Pink:
#CC164D;
- Orange:
#e67e22;
- Blue:
#00ADBB;
- Pink:
#c71c77;
- Lime:
#b1dc44;
- BlueDark:
#34495e;
- RedDark:
#a10f2b;
- Brown:
#91633c;
- CyanDark:
#008b8b;
- Yellow:
#D4AC0D;
- Slate:
#5D6D7E;
- Olive:
#808000;
- Teal:
#008080;
- GreenBright:
#2ECC71;
Each additional one has a separate .css file within the /css directory: ie. colour-COLOURNAME.css
These files can be used as an example of how to implement your own colour schemes.
Example - Add the following to your <head> tags below the
NOTE: You will need to do this on all pages to implement site wide. The “colour-scheme” ID tag is only required if you want the jQuery colour switcher to be functionality. Quickest way to hide the colour switcher is to add
.colour-switcher { display: none; }
to your CSS.
If you are comfortable with using Sass it’s recommended to override the colour scheme by altering the $primary_colour variables and then recompiling the CSS, see the assets/scss/example-custom-colour.scss file for an example.


Welcome to GoBusiness
What would you like to do today?
Grants
Gebiz Alerts
Licences
Business
Grants Portal
Apply for and manage grants on Business Grants Portal.
{% include secondary-btn.html href="https://www.businessgrants.gov.sg/?src=login_bgp" target="_blank" rel='noopener' text="Log In" %}GeBIZ Alerts
Subscribe to GeBIZ alerts via email.
{% include secondary-btn.html href="/gebiz-alerts/?src=login_gebizalerts" text="Log In" %}Licences for Food Services
Apply for and manage licences for food service businesses.
{% include secondary-btn.html href="https://foodservices.gobusiness.gov.sg/licences/foodservices?src=login_fs" target="_blank" rel='noopener' text="Log In" %}Licences
from SFA/AVS/
NParks
Apply for, renew and manage licences from Singapore Food Agency, Animal & Veterinary Service, and NParks
{% include secondary-btn.html href="https://licence1.business.gov.sg/licence1/authentication/mainLogin.action?src=login_sfavsnparks" target="_blank" rel='noopener' text="Log In" %}Licences for Other Sectors
* Apply and renew licences
* Manage licences


Welcome to the web's most successful dating website. At My Dating Website you'll meet another like minded individuals. We have the highest success rate of couples on the web. User's are matched by interest and location. Find out why so many others have found love on our site!
"I met the love of my life after only a month!" -Andrea
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Visit this page every week to hear the hottest tunes, or at least the ones we're rocking out to right now!
This week our huge tune is Tompkins Square Park by Mumford and Sons.
You might know them as a silly folky band, but they've tightened things up in this last album and gone just a little bit rock. Check it out.


X019 gameplay: Halo Reach, Bleeding Edge, Project Resistance, more
by Steve WrightWhen given the opportunity to capture gameplay, you capture gameplay.
Stevivor attended X019 in London last week, and as a result, we’ve a ton of new gameplay to show off to you. Titles include Bleeding Edge, Halo Reach, KartRacer Drift, Tunic, Carrion and Project Resistance.
Without further adieu, you can find it all below. Expect proper previews in the days to come.
Bleeding Edge X019 gameplay
Of note here is the newly announced character Cass. We were also able to spend a large chunk of time in the in-game Dojo ahead of the actual match, useful for testing out characters and their abilities.
Bleeding Edge heads to both Windows PC and Xbox One on 24 March 2020.
Halo Reach PC X019 gameplay
Stevivor was able to go hands-on with Halo: Reach on PC at X019. Check out action from the Winter Contingency level below.
Halo Reach will be added to Halo The Master Chief Collection on 3 December across both Windows PC via the Microsoft Store & Steam and Xbox One.
KartRacer Drift X019 gameplay
Developed by Nexon, KartRacer Drift is a westernised version of a popular Korean karting game named Crazyracing Kartrider, a title that’s been available in various forms since 2004.
KartRacer Drift will heads to Windows PC and Xbox One in 2020; a closed beta takes place between 5-8 December.
Tunic X019 gameplay
The ever-charming Tunic featured at X019, and Stevivor jumped at the chance to capture gameplay from it. If you’re not picking up on the massive Zelda vibes coming from this title, largely developed by the singular Andrew Shouldice, we don’t know what to tell you.
Tunic doesn’t have a release date as yet but it planned for release on Windows PC, Mac and Xbox One.
Carrion X019 gameplay
We delighted at the chance to play Phobia Game Studio’s Carrion, a title in which you play as the same type of biohazardous blob that usually ends up the final boss battle of a Resident Evil-style game. Check out the carnage below.
Carrion will head to Windows PC and Xbox One in 2020.
Project Resistance X019 gameplay
Stevivor was lucky enough to capture Project Resistance gameplay as both a survivor and a Mastermind; both are below.
Project Resistance is a 4v1 experience announced by Capcom at Tokyo Game Show 2019. It’s planned for Windows PC, Xbox One and PS4.
Steve Wright attended X019 in London, England as a guest of Microsoft. Travel and accomodation were supplied by Microsoft.


Our favorite things
These are a few of our favorite things.
People
Here are some of our favorite people!
My mom and dad:
My friend Jessica
My friend Candy
Flavors of ice cream
These are our three favorites, in order:
- Pistachio
- Malted milk chocolate
- Black licorice (really!)
This is a link to Google
Thanks for reading about us!


Change-streams
change-stream support is provided via the DB.Watcher<T>
registry. you can use a watcher to receive notifications when a given entity type gets either created, updated or deleted. only monitoring at the collection level is supported.
1. Retrieve a watcher instance
var watcher = DB.Watcher<Author>("some-unique-name-for-the-watcher");
pass a unique string to get a watcher instance. if a watcher by that name already exists in the registry, that instance will be returned. if no such watcher exists, a fresh watcher will be returned.
2. Configure and start the watcher
watcher.Start(
eventTypes: EventType.Created | EventType.Updated | EventType.Deleted,
filter: null,
batchSize: 25,
onlyGetIDs: false,
autoResume: true,
cancellation: default);
Note
all except the eventTypes parameter are optional and the default values are shown above.
eventTypes: specify what kind of change event you'd like to watch for. multiple types can be specified as shown.
filter: if you'd like to receive only a subset of change events, you can do so by supplying a lambda expression to this parameter. for example, if you're interesed in being notified about changes to Authors who are aged 25 and above, set the filter to the following:
x => x.FullDocument.Age >= 25
Note
filtering cannot be done if the types of change you're interested in includes deletions. because the entity data no longer exists in the database when a deletion occurs and mongodb only returns the entity ID with the change event.
batchSize: specify the maximum number of entities you'd like to receive per change notification/ a single event firing. the default is 25.
onlyGetIDs: set to true if you don't want the complete entity details. in which case all properties except the ID will be null on the received entities.
autoResume: change-streams will be auto-resumed by default unless you set this parameter to false. what that means is, say for example you start a watcher and after a while the watcher stops due to an error or an invalidate event. you can then re-start the watcher and it will start receiving notifications from where it left off and you won't lose any changes that occurred while the watcher was stopped. if you set this to false, then those changes are skipped and only new changes are received. the resume tokens are not automatically stored on disk by the library. see here about resuming across app restarts.
cancellation: if you'd like to cancel/abort a watcher and close the change-stream permanently at a future time, pass a cancellation token to this parameter.
3. Subscribe to the events
OnChanges
watcher.OnChanges += authors =>
{
foreach (var author in authors)
{
Console.WriteLine("received: " + author.Name);
}
};
this event is fired when desired change events have been received from mongodb. for the above example, when author entities have been either created, updated or deleted, this event/action will receive those entities in batches. you can access the received entities via the input action parameter called authors
.
Receiving ChangeStreamDocuments:
if you'd like to receive the complete ChangeStreamDocuments
instead of just the entities, you can subscribe to the OnChangesCSD
method like so:
watcher.OnChangesCSD += changes =>
{
foreach (var csd in changes)
{
Console.WriteLine(
"Removed Fields: " +
string.Join(", ", csd.UpdateDescription.RemovedFields));
}
};
Async event handlers:
there's also the async variants of these events called OnChangesAsync
and OnChangesCSDAsync
for when you need to do IO bound work inside the handler in the correct batch order.
what that means is, if you do watcher.OnChanges += async authors => {...}
the handler function will be called in parallel for each batch of change events. it is ok to use it when the order of the batches are not important to you or when you don't need precise resume token retrieval.
as a rule of thumb, always do watcher.OnChangesAsync += async authors => {...}
when you need to use the await
keyword inside the event handler.
see here for a full example.
OnError
watcher.OnError += exception =>
{
Console.WriteLine("error: " + exception.Message);
if (watcher.CanRestart)
{
watcher.ReStart();
Console.WriteLine("Watching restarted!");
}
};
in case the change-stream ends due to an error, the OnError
event will be fired with the exception. you can try to restart the watcher as shown above.
OnStop
watcher.OnStop += () =>
{
Console.WriteLine("Watching stopped!");
if (watcher.CanRestart)
{
watcher.ReStart();
Console.WriteLine("Watching restarted!");
}
else
{
Console.WriteLine("This watcher is dead!");
}
};
this event will be fired when the internal cursor gets closed due to either you requesting cancellation or an invalidate
event occurring such as renaming or dropping of the watched collection.
if the cause of stopping is due to aborting via cancellation-token, the watcher has already purged all the event subscribers and no longer can be restarted.
if the cause was an invalidate
event, you can restart watching as shown above. the existing event subscribers will continue to receive change events.
Limiting properties of returned entities
you can apply a projection in order to specify which properties of your entity type you'd like returned when the change events are triggered like so:
watcher.Start(
eventTypes: EventType.Created | EventType.Updated,
projection: a => new Author
{
Name = a.Name,
Address = a.Address
});
with the above example, only the author name and address properties will have their values populated. the rest of the properties will be null.
Note
projections cannot be done if the types of change you're interested in includes deletions. because the entity data no longer exists in the database when a deletion occurs and mongodb only returns the entity ID with the change event.
Resuming across app restarts
you can retrieve a resume token from the ResumeToken
property of the watcher like so:
var token = watcher.ResumeToken;
persist this token to a non-volatile medium and use it upon app startup to initiate a watcher to continue/resume from where the app left off last time it was running.
watcher.StartWithToken(token, ...);
see here for a full example of how to use resume tokens.
Precise resume token retrieval
the resume token returned by the watcher.ResumeToken
property is the last token of the current batch of change events. if your app/server is prone to frequent crashes or your app tends to get shut down abruptly (without letting all the OnChanges*
event handlers complete their work), you may lose some change events when you resume watching with the last token retrieved from watcher.ResumeToken
.
to prevent that from happening and have fine-grain control of the token storage and resumption, you must subscribe to a OnChangesCSD*
event and retrieve + store the token from each ChangeStreamDocument
like so:
watcher.OnChangesCSDAsync += async csDocs =>
{
foreach (var csd in csDocs)
{
if (csd.OperationType == ChangeStreamOperationType.Insert)
{
Console.WriteLine("created: " + csd.FullDocument.Title);
}
await StoreResumeTokenAsync(csd.ResumeToken);
}
};
if you're re-starting a stopped/errored watcher, you can provide the latest resume token you have like so:
watcher.OnError += exception =>
{
Console.WriteLine("error: " + exception.Message);
if (watcher.CanRestart)
{
watcher.ReStart(lastResumeToken);
}
};
Access all watchers in the registry
var watchers = DB.Watchers<Author>();
foreach (var w in watchers)
{
Console.WriteLine("watcher: " + w.Name);
}
Note
there's a watcher registry per entity type and the watcher names need only be unique to each registry.
Notes on resource usage
each watcher/change-stream you create opens a long-running cursor on the database server, which also means a persistent network connection between your application and the database. if you create more than a handful of watchers in your application, you should consider increasing the size of the mongodb driver thread-pool size as shown below:
await DB.InitAsync("DatabaseName", new MongoClientSettings()
{
...
MaxConnectionPoolSize = 100 + NumberOfWatchers,
...
});
in addition to persistent network connections/cursors, each watcher will use a small amount of memory for an async/await state machine that does the actual work of iterating the change-stream cursor and emitting events without blocking threads during IO.
the bottom line is, change-streams can be a double-edged sword if not used sparingly. the beefier the machine that runs your app, the more change-streams you can create without affecting the performance of the rest of your application.


Basics of Storm
- Javadoc
- Concepts
- Configuration
- Guaranteeing message processing
- Fault-tolerance
- Command line client
- Understanding the parallelism of a Storm topology
- FAQ
Trident
Trident is an alternative interface to Storm. It provides exactly-once processing, “transactional” datastore persistence, and a set of common stream analytics operations.
- Trident Tutorial – basic concepts and walkthrough
- Trident API Overview – operations for transforming and orchestrating data
- Trident State – exactly-once processing and fast, persistent aggregation
- Trident spouts – transactional and non-transactional data intake
Setup and deploying
- Setting up a Storm cluster
- Local mode
- Troubleshooting
- Running topologies on a production cluster
- Building Storm with Maven
Intermediate
- Serialization
- Common patterns
- Clojure DSL
- Using non-JVM languages with Storm
- Distributed RPC
- Transactional topologies
- Kestrel and Storm
- Direct groupings
- Hooks
- Metrics
- Lifecycle of a trident tuple
Advanced
- Defining a non-JVM language DSL for Storm
- Multilang protocol (how to provide support for another language)
- Implementation docs


Simple Example
Cubes 1
Cubes 2
Cubes 3
Cubes 4
Noise
Airlines
Migrations
Airtraffic
Bundle all
Reset
Distortion factor:
Weight factor:
Bundle strength:
Interactive
Animated


The diagram below represents the workflow and available operations for each development environment:
| Action/Environment | Save test data (sql or zip) | Drop/Create DB | Apply Baseline | Run Change Scripts | Import Test Data (sql or zip) | Run Data Change Scripts |
| DEV | optional | x | x | x | x | x |
| STG | x | x | ||||
| PROD | x | x |


This is when the mentor and the student schedule a time every week to meet and go over material relating to the student's life.
This is when the mentor and the student schedule a time every week to meet and go over material relating to the student's life.
This is when the mentor and the student schedule a time every week to meet and go over material relating to the student's life.
This is when the mentor and the student schedule a time every week to meet and go over material relating to the student's life.
This is when the mentor and the student schedule a time every week to meet and go over material relating to the student's life.


Where to get help
If you think you’ve found a bug in the Cayman theme, please check the existing issues, and if no one has reported the problem, open a new issue.
If you have a general question about the theme, how to implement it, or how to customize it for your site you have two options:
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support.github.com
, which will also look for similar topics ongithub.community
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About Me
- New to Web-development & Web-design, I now have the full complement of Sales & Marketing skills!
- A successful Business manager, I aim to achieve win : win solutions for both employer & customer by building lasting partnerships based on fantastic service & quality locally-made product.
- I am equally comfortable working on creative solutions & on numerical trackers & data analysis.
- I thrive on variety & challenge, used to juggling many customers & projects simultaneously.
- I have diverse skills & experience in both business development & product development.
- My passion is making everyday products more sustainable for the planet & healthier for the consumer.
- A Community Engagement aspect in my role is vital as “giving back” is important to me.
My Work
Contact Me
- Mobile: +61 432 297 755
- E-mail<EMAIL_ADDRESS>- LinkedIn: www.linkedin.com/in/rachel-brain
- GitHub: github.com/rachel-brain


Jorja Mederick qualifies for U16 Masters Final
by St Lucia National Tennis Centre(PRESS RELEASE) – Jorja Mederick who is the current number one Nationally ranked girls U14 & u16 player has qualified to compete in the Masters Final of the SR4 U16 Transitional Series in Trinidad & Tobago scheduled for 22nd-24th November, 2019. She will be competing against counterparts from Trinidad, Suriname, Barbados and Antigua & Barbuda.
Mederick is a form four student of the Leon Hess Comprehensive Secondary School. She is coached by Davis Cup icon Vernon Lewis.
Her qualification into this tournament was secured by her participation and performance in the COTECC regional tournaments for this year.
She recently represented St. Lucia at the U16 SR4 Team Championship where she partnered with Maxx William on the A team. She also competed in the St. Lucia leg of the U16 series placing 4th overall in the tournament. Earlier this year Mederick was the finalist at the Annual National independence Tennis Tournament making her the youngest finalist at this level and age category.
This tournament is a great initiative taken by SR4 to assist our juniors’ transition from under 14s to under 18s which is absolutely a big jump for the athletes. There are many incentives for the players who participate, ranking points, opportunity to win passes to tennis academies and educational forums.
The boy and girl with the most points accumulated as a result of their performance in their singles, doubles and mixed doubles events will receive a 1 week (non-live in) training scholarship to the Inspiration Academy located in Florida, USA.
The St. Lucia Tennis Association wishes to congratulate Miss Mederick on making the Masters Final and wish her every success at this tournament.
More Sports Stories
-
Much work to be done ahead of World Cup, says Windies coach November 20, 2019
-
Qiana Joseph to participate in Women’s T20 Grand Slam Franchise Tournament November 20, 2019
-
Saint Lucia misses Gold Cup playoffs after falling to Montserrat November 20, 2019
-
St. Lucia Aquatics Federation awards team Sandals with the trophy for the 2nd Annual Inter Commercial Swim Championship November 19, 2019
-
A decade of support for CFC youth football November 18, 2019
-
ARC 2019 officially opens with lively national flag parade November 18, 2019
-
Saint Lucia calls up UK-based goalkeeper Lamar Johnson November 12, 2019
-
India win game one of five-match T20 international series against West Indies women November 9, 2019
-
Nisso Etienne representing Saint Lucia at World Sambo Championships in South Korea November 9, 2019


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--- layout: base title: Tha-Phuong Vo subtitle: Languages & Code use-site-title: true css: "/css/custom.css" ---
Hello, my name is Tha-Phuong and I write about languages and programming.
The site is currently under construction; I expect the site to be finished by the end of August 2021.
If you have any questions, please get in touch by emailing me at tom_vo
at outlook.com
.


xxxx
Bootstrap is the most popular HTML, CSS, and JS framework for developing responsive, mobile-first projects on the web.
This is some text.
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The .table-hover class enables a hover state on table rows:
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|---|---|---|
| John | Doe |<EMAIL_ADDRESS>|
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| July | Dooley |<EMAIL_ADDRESS>|


Fast & Furious Is About To Get Even Less Realistic
A new Fast & Furious spin-off is racing onto Netflix next month.
by Martin BiggThe Fast & Furious series prides itself on defying the laws of physics. Throughout the nine movies that have been released so far, we've seen a Lykan Hypersport smash through multiple skyscrapers, cars parachute from the sky, and two Dodge Chargers drag a ten-ton bank vault down city streets.
And yet, somehow, the series is about to get even less realistic, as new animated spin-off show called 'Fast & Furious: Spy Racers' is airing on Netflix next month. Switching to animation means we can expect the car stunts to be even crazier than the live-action films.
After releasing a short teaser trailer giving us a sneak peek at the show's racing action back in July, Netflix has released new photos and announced the cast list for the new animated series. Produced by DreamWorks Animation, 'Fast & Furious: Spy Racers' centers on teenager Tony Toretto, the cousin of Dominic Toretto played by Vin Diesel, and his friends who are recruited by a government agency to "infiltrate an elite racing league serving as a front for a nefarious crime organization called SH1FT3R bent on world domination." Tony Toretto will be played by 'Teen Wolf' star Tyler Posey.
Other cast members include Camille Ramsey (American Vandal) as underground racer Layla Gray, Luke Youngblood (Harry Potter) as 13-year old tech genius Frostee Benson, Charlet Chung (Overwatch) as talented artist Echo, and Jorge Diaz (Jane the Virgin) as Cisco Renaldo, who acts as "the muscle and the sweetheart of the crew."
You'll notice that none of the characters from the main Fast & Furious films are returning, but Vin Diesel acts as Executive Producer with Neal H. Moritz and Chris Morgan, who have all served as producers on the live-action Fast & Furious film franchise. Sticking with the franchise's "family" theme, Vin Diesel's daughter, Similce Diesel, will guest star in the series as Frostee's younger sister Sissy.
While the show will no doubt feature lots of automotive action, none of the cars shown in photos or the teaser trailer appear to be licensed, sadly, although the muscle car featured in the show's main art is clearly inspired by the Dodge Challenger. 'Fast & Furious: Spy Racers' is racing onto Netflix on December 26.