Issue 83
Welcome to another issue of Haskell Weekly!  This is a weekly summary of what’s going on in its community.
Featured
-
To complete the
Monad
-hierarchy refactoring started with AMP (& MFP) and unifyreturn
/pure
&>>
/*>
, moveMonad(return)
andMonad((>>))
methods out of theMonad
class into top-level bindings aliasingApplicative(pure)
andApplicative((*>))
respectively. -
Hamiltonian dynamics in Haskell
At the end of this, we should be able to have Haskell automatically generate equations of motions for any arbitrary system described in arbitrary coordinate systems, and simulate that system.
-
Haskell exceptions and FFI wrappers
The Haskell FFI is incredibly powerful, allowing you to convert Haskell functions into C function pointers. In this post I’ll give a quick example, then go into what happens if the Haskell function throws an exception.
-
Exception handling in Haskell jobs
I am using yesod-job-queue to define the
job
. The use-case was, that this was a scheduled job and we needed to log the failures. But on running this; there was an error, sincerunJob
in yesod-job-queue does not have theMonadCatch
constraint. -
Bracket: A tale of partially applied functions
In this post, we describe how we can use partially applied functions as a design building block though the study of a practical example: the
bracket
function. -
Deciphering Haskell’s applicative and monadic parsers
This post follows the construction of parsers described in Graham Hutton’s “Programming in Haskell”. It’s my attempt to work through chapter 13 in this book and understand the details of applicative and monadic combination of parsers presented therein.
-
WebAssembly call to action: Syscalls needed!
In the effort to port GHC to WebAssembly, the biggest challenge has been the C toolchain. We have a compiler, a static linker, a libc, and Nix glue for all of this. But we don’t have many syscalls.
-
How to unit test code that uses polymorphic interfaces?
I’ve been largely happy with a lot of the solutions I’ve come up with, but there’s one sort of problem I’ve always been unsatisfied with. It’s quite easy to unit test code that uses plain old monomorphic functions, but it’s comparatively difficult as soon as polymorphism is involved.
-
GHC: Warn on recursive bindings
When you accidentally write something like
let x = .. x ...
it can take hours to realize where you made your mistake. This hits me once in a while, and my colleagues often. -
Total Haskell is reasonable Coq
We would like to use the Coq proof assistant to mechanically verify properties of Haskell programs. To that end, we present a tool, named hs-to-coq, that translates total Haskell programs into Coq programs via a shallow embedding.
Jobs
-
Capital Match is seeking a Software Engineer in Singapore
We are looking for experienced developers to lead our tech growth in the Fintech space, expand into surrounding countries and develop new products on the platform.
In brief
- Building slim Docker images for Haskell applications
- Computerphile: What is a monad?
- Haskell University: A portfolio-based approach to learning Haskell
- ICFP 2017 videos
- Stackage nightly 2017-11-25 uses GHC 8.2.2
Package of the week
This week’s package of the week is Validity, a library that makes invariants explicit by providing a function to check whether the invariants hold.
Call for participation
- dejafu: Add a testPropertyFor to {hunit,tasty}-dejafu
- persistent: Provide scripts to reproduce errors for each backend
Check out 24 Pull Requests for some additional Haskell projects to work on!
Events
- November 30: HaskellerZ: Tom Sydney Kerckhove: An overview of validity based testing
- December 1: Austin Types, Theorems, and Programming Languages: Going through Software Foundations by Benjamin Pierce et al
- December 2: FPConf 2017
- December 4: YOW 2017
- December 5: LA PureScript: Nathan Faubion on Async Programming in PureScript
- December 6: Berlin Functional Programming Group: FP Forum: Learn, Teach, Share, Grow
- December 7: Haskell.SG: December Meetup


| 1 | /* | |
| 2 | * Licensed to the Apache Software Foundation (ASF) under one or more | |
| 3 | * contributor license agreements. See the NOTICE file distributed with | |
| 4 | * this work for additional information regarding copyright ownership. | |
| 5 | * The ASF licenses this file to You under the Apache License, Version 2.0 | |
| 6 | * (the "License"); you may not use this file except in compliance with | |
| 7 | * the License. You may obtain a copy of the License at | |
| 8 | * | |
| 9 | * http://www.apache.org/licenses/LICENSE-2.0 | |
| 10 | * | |
| 11 | * Unless required by applicable law or agreed to in writing, software | |
| 12 | * distributed under the License is distributed on an "AS IS" BASIS, | |
| 13 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | |
| 14 | * See the License for the specific language governing permissions and | |
| 15 | * limitations under the License. | |
| 16 | */ | |
| 17 | ||
| 18 | package org.apache.commons.math3.analysis.solvers; | |
| 19 | ||
| 20 | import org.apache.commons.math3.analysis.differentiation.DerivativeStructure; | |
| 21 | import org.apache.commons.math3.analysis.differentiation.UnivariateDifferentiableFunction; | |
| 22 | import org.apache.commons.math3.exception.TooManyEvaluationsException; | |
| 23 | ||
| 24 | /** | |
| 25 | * Provide a default implementation for several functions useful to generic | |
| 26 | * solvers. | |
| 27 | * | |
| 28 | * @since 3.1 | |
| 29 | * @version $Id: AbstractUnivariateDifferentiableSolver.java 1455194 2013-03-11 15:45:54Z luc $ | |
| 30 | */ | |
| 31 | public abstract class AbstractUnivariateDifferentiableSolver | |
| 32 | extends BaseAbstractUnivariateSolver<UnivariateDifferentiableFunction> | |
| 33 | implements UnivariateDifferentiableSolver { | |
| 34 | ||
| 35 | /** Function to solve. */ | |
| 36 | private UnivariateDifferentiableFunction function; | |
| 37 | ||
| 38 | /** | |
| 39 | * Construct a solver with given absolute accuracy. | |
| 40 | * | |
| 41 | * @param absoluteAccuracy Maximum absolute error. | |
| 42 | */ | |
| 43 | protected AbstractUnivariateDifferentiableSolver(final double absoluteAccuracy) { | |
| 44 | super(absoluteAccuracy); | |
| 45 | } | |
| 46 | ||
| 47 | /** | |
| 48 | * Construct a solver with given accuracies. | |
| 49 | * | |
| 50 | * @param relativeAccuracy Maximum relative error. | |
| 51 | * @param absoluteAccuracy Maximum absolute error. | |
| 52 | * @param functionValueAccuracy Maximum function value error. | |
| 53 | */ | |
| 54 | protected AbstractUnivariateDifferentiableSolver(final double relativeAccuracy, | |
| 55 | final double absoluteAccuracy, | |
| 56 | final double functionValueAccuracy) { | |
| 57 | super(relativeAccuracy, absoluteAccuracy, functionValueAccuracy); | |
| 58 | } | |
| 59 | ||
| 60 | /** | |
| 61 | * Compute the objective function value. | |
| 62 | * | |
| 63 | * @param point Point at which the objective function must be evaluated. | |
| 64 | * @return the objective function value and derivative at specified point. | |
| 65 | * @throws TooManyEvaluationsException | |
| 66 | * if the maximal number of evaluations is exceeded. | |
| 67 | */ | |
| 68 | protected DerivativeStructure computeObjectiveValueAndDerivative(double point) | |
| 69 | throws TooManyEvaluationsException { | |
| 70 | 1 | incrementEvaluationCount(); |
| 71 | 1 | return function.value(new DerivativeStructure(1, 1, 0, point)); |
| 72 | } | |
| 73 | ||
| 74 | /** | |
| 75 | * {@inheritDoc} | |
| 76 | */ | |
| 77 | @Override | |
| 78 | protected void setup(int maxEval, UnivariateDifferentiableFunction f, | |
| 79 | double min, double max, double startValue) { | |
| 80 | 1 | super.setup(maxEval, f, min, max, startValue); |
| 81 | function = f; | |
| 82 | } | |
| 83 | } | |
Mutations | ||
| 70 |
removed call to org/apache/commons/math3/analysis/solvers/AbstractUnivariateDifferentiableSolver::incrementEvaluationCount : KILLED -> org.apache.commons.math3.analysis.solvers.NewtonRaphsonSolverTest.testSinZero(org.apache.commons.math3.analysis.solvers.NewtonRaphsonSolverTest) |
|
| 71 |
mutated return of Object value for org/apache/commons/math3/analysis/solvers/AbstractUnivariateDifferentiableSolver::computeObjectiveValueAndDerivative to ( if (x != null) null else throw new RuntimeException ) : KILLED -> org.apache.commons.math3.analysis.solvers.NewtonRaphsonSolverTest.testQuinticZero(org.apache.commons.math3.analysis.solvers.NewtonRaphsonSolverTest) |
|
| 80 |
removed call to org/apache/commons/math3/analysis/solvers/BaseAbstractUnivariateSolver::setup : KILLED -> org.apache.commons.math3.analysis.solvers.NewtonRaphsonSolverTest.testQuinticZero(org.apache.commons.math3.analysis.solvers.NewtonRaphsonSolverTest) |


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The Tooltip plugin is small pop-up box that appears when the user moves the mouse pointer over an element:
Hover over meBy default, the tooltip will appear on top of the element.
Use the data-placement
attribute to set the position of the tooltip on top, bottom, left or the right side of the element:
Tip: You can also use the data-placement attribute with a value of "auto", which will let the browser decide the position of the tooltip. For example, if the value is "auto left", the tooltip will display on the left side when possible, otherwise on the right.
The Popover plugin is similar to tooltips; it is a pop-up box that appears when the user clicks on an element. The difference is that the popover can contain much more content.
Toggle popoverBy default, the popover will appear on the right side of the element.
Use the data-placement
attribute to set the position of the popover on top, bottom, left or the right side of the element:
By default, the popover is closed when you click on the element again. However, you can use the data-trigger="focus"
which will close the popover when clicking outside the element:
Tip: If you want the popover to be displayed when you move the mouse pointer over the element, use the data-trigger
attribute with a value of "hover":


The following projects were developed to explore the use of some popular CSS and JS libraries for front-end and data visualization web development. For the backend, the Python Flask web service framework, MySQL and Airtable REST API were used to support data provision and CRUD operations.


Here at A+ Pizza's, we aim to deliver a high-quality dining
experience everytime.
Be it in our restaurant, or from the comfort of your home, each
bite will deliver a full gourmet experience.
Please Note: All pizza's start with a margarita base (pizza sauce and cheese).


|
VirtualSCADA
1.0
VirtualSCADA Senior Design Project
|
Public Member Functions | |
| setupApplication () | |
| iDescribeTheClass ($class) | |
| iRunPhpspec ($formatter=null, $option=null, $interactive=null) | |
| iRunPhpspecAndAnswerWhenAskedIfIWantToGenerateTheCode ($answer, $option=null) | |
| iShouldSee ($output) | |
| iShouldBePromptedForCodeGeneration () | |
| iShouldNotBePromptedForCodeGeneration () | |
| theSuiteShouldPass () | |
| exampleShouldHaveBeenSkipped ($number) | |
| examplesShouldHaveBeenRun ($number) | |
| theExitCodeShouldBe ($code) | |
| iShouldSeeValidJunitOutput () | |
| theTestsShouldBeRerun () | |
| theTestsShouldNotBeRerun () | |
| getMatchers () | |
Defines application features from the specific context.
Definition at line 19 of file ApplicationContext.php.
| exampleShouldHaveBeenSkipped | ( | $number | ) |
:number example(s) should have been skipped
Definition at line 179 of file ApplicationContext.php.
| examplesShouldHaveBeenRun | ( | $number | ) |
:number example(s) should have been run
Definition at line 187 of file ApplicationContext.php.
| getMatchers | ( | ) |
Custom matchers
Implements MatchersProviderInterface.
Definition at line 229 of file ApplicationContext.php.
| iDescribeTheClass | ( | $class | ) |
I have started describing the :class class I start describing the :class class
Definition at line 78 of file ApplicationContext.php.
| iRunPhpspec | ( | $formatter = null , |
|
$option = null , |
|||
$interactive = null |
|||
| ) |
I run phpspec (non interactively) I run phpspec using the :formatter format I run phpspec with the :option option /I run phpspec with option (?P<option>.*)/ /I run phpspec (?P<interactive>interactively)$/ /I run phpspec (?P<interactive>interactively) with the (?P<option>.*) option/
Definition at line 96 of file ApplicationContext.php.
| iRunPhpspecAndAnswerWhenAskedIfIWantToGenerateTheCode | ( | $answer, | |
$option = null |
|||
| ) |
I run phpspec and answer :answer when asked if I want to generate the code I run phpspec with the option :option and (I) answer :answer when asked if I want to generate the code
Definition at line 115 of file ApplicationContext.php.
| iShouldBePromptedForCodeGeneration | ( | ) |
I should be prompted for code generation
Definition at line 155 of file ApplicationContext.php.
| iShouldNotBePromptedForCodeGeneration | ( | ) |
I should not be prompted for code generation
Definition at line 163 of file ApplicationContext.php.
| iShouldSee | ( | $output | ) |
I should see :output I should see:
Definition at line 147 of file ApplicationContext.php.
| iShouldSeeValidJunitOutput | ( | ) |
I should see valid junit output
Definition at line 203 of file ApplicationContext.php.
| setupApplication | ( | ) |
Definition at line 49 of file ApplicationContext.php.
| theExitCodeShouldBe | ( | $code | ) |
the exit code should be :code
Definition at line 195 of file ApplicationContext.php.
| theSuiteShouldPass | ( | ) |
the suite should pass
Definition at line 171 of file ApplicationContext.php.
| theTestsShouldBeRerun | ( | ) |
the tests should be rerun
Definition at line 211 of file ApplicationContext.php.
| theTestsShouldNotBeRerun | ( | ) |
the tests should not be rerun
Definition at line 219 of file ApplicationContext.php.


This service will hide a file in an image using steganography.
This service will reverse what the one above did.
This service is a demo, and is NOT SECURE in any sense of the word. It was lazily whipped together in a few hours as a fun proof of concept. Both your secret message and the extraction password will be sent in cleartext to the server. They can be intercepted by any eavesdropper along the way, and might remain cached on the server indefinitely.
(c) 2016 Emil Lundberg
Source code available on GitHub.


--- layout: page ---
The goal of Lifestone’s KID’S LIFE ministry is to teach kids truths of the Bible with age-appropriate, fun, interactive experiences taught by committed volunteers who serve Jesus by serving you and your kids. Lifestone is committed not only to cementing the fundamentals of faith into the hearts and minds of children, but also equipping parents and getting families talking about Jesus together throughout their week.
When you walk in the door you’ll see signage directing you to your child’s check in. At the check in area, you will be greeted by a volunteer who will help you sign in your child. Our desire is for families to worship together, so when the worship music begins, your child’s teacher will bring children grades K-5 in to worship along side the adults before returning to the kids area for their kid-sized Bible lesson.
*** Our secure environments are staffed with loving volunteers who have all submitted to extensive background checks and interviews.
{% include flickr.html albumId='72157651701812368' coverImage='https://c8.staticflickr.com/8/7674/17229952151_0e12fe65c1_z.jpg' %}


The Line is using an Algorithm called A* which takes inspiration from Dijsktra’s Shortest Path algorithm to find the shortest path from bottom left of the screen to the top right of the screen.
A* and Dijkstra both have quadratic time complexity because in word case It'll have to consider the entire 2D array of nodes. The improvement A* has over Dijskra is that it uses a ‘heuristic’ to make educated guesses about the general direction you need to go. The heuristic I use is considering the straight line distance fro the current node to the end. I know I want to get from bottom right to top left so I’m going to first consider paths that point to the direction I'm headed.


--- layout: post title: "My Week in Review" date: 2017-03-26 07:05:00 +0000 tags: image: https://s3.amazonaws.com/audreywatters/2017-03-26-dragon.jpg imagecredits: https://www.flickr.com/photos/surreal_badger/33407279626 ---
Icon credits: The Noun Project


Introduction
- asyncio
- Coroutines
- Awaitable
- Creating Tasks
1. Coroutines
-
Declaration : Python functions defined with the
def
syntax are synchronous functions. However, to make a function asynchronous, you need to use theasync
keyword to the function definition. And we call this async funtion, Coroutine. -
Run a coroutine : Simply calling a coroutine will not schedule it to be executed.
asyncio
provides the following mechanisms (multiple ways) to run a coroutine-
ayncio.run()
: run the top-level entry point -
await
: awaiting on a coroutine -
ayncio.create_task()
: run coroutines concurrently as asyncioTasks
-
import asyncio
import time
# Define coroutine with async syntax
async def say_after(delay, what):
await asyncio.sleep(delay)
print(what)
# takes 3secs to run
async def main():
await say_after(1, 'hello')
await say_after(2, 'world')
# takes 2secs to run
async def main():
task1 = asyncio.create_task(say_after(1, 'hello'))
task2 = asyncio.create_task(say_after(2, 'world'))
await task1
await task2
asyncio.run(main())
2. Awaitables
-
We say that an object is awaitable object if it can be used in an await expression
-
couroutines : are awaitables and therefore can be awaited from other coroutines
-
a coroutine function: an
async def
function; -
a coroutine object: an object returned by calling a coroutine function.
-
-
Tasks : are used to schedule coroutines concurrently. When a coroutine is wrapped into a Task with functions like
asyncio.create_task()
the coroutine is automatically scheduled to run soon: -
Futures : a special low-level awaitable object that represents an eventual result of an asynchronous operation.
-
3. Creating Tasks
asyncio.create_task(coro, *, name=None, context=None)
background_tasks = set()
for i in range(10):
task = asyncio.create_task(some_coro(param=i))
# Add task to the set. This creates a strong reference.
background_tasks.add(task)
# To prevent keeping references to finished tasks forever,
# make each task remove its own reference from the set after completion:
task.add_done_callback(background_tasks.discard)
7. Running Tasks Concurrently
-
asyncio.gather(*aws, return_exceptions=False)
: Run awaitable objects in the aws sequence concurrently.
import asyncio
async def test(name, time):
await asyncio.sleep(time)
return "Done"
async def main():
L = await asyncio.gather(test("A", 1), test("B", 2), test("C", 3))
asyncio.run(main()


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AnimatedSprite QML Type
Draws a sprite animation More...
| Import Statement: | import QtQuick 2.7 |
| Inherits: |
Properties
- currentFrame : int
- frameCount : int
- frameDuration : int
- frameHeight : int
- frameRate : qreal
- frameSync : bool
- frameWidth : int
- frameX : int
- frameY : int
- interpolate : bool
- loops : int
- paused : bool
- reverse : bool
- running : bool
- source : url
Methods
Detailed Description
AnimatedSprite provides rendering and control over animations which are provided as multiple frames in the same image file. You can play it at a fixed speed, at the frame rate of your display, or manually advance and control the progress.
For details of how a sprite animation is defined see the Sprite Animations overview. Note that the AnimatedSprite type does not use Sprite types to define multiple animations, but instead encapsulates a single animation itself.
Property Documentation
When paused, the current frame can be advanced manually by setting this property or calling advance().
Number of frames in this AnimatedSprite.
Duration of each frame of the animation. Values equal to or below 0 are invalid.
If frameRate is valid then it will be used to calculate the duration of the frames. If not, and frameDuration is valid, then frameDuration will be used.
Changing this parameter will restart the animation.
Height of a single frame in this AnimatedSprite.
May be omitted if it is the only sprite in the file.
Frames per second to show in the animation. Values equal to or below 0 are invalid.
If frameRate is valid then it will be used to calculate the duration of the frames. If not, and frameDuration is valid , then frameDuration will be used.
Changing this parameter will restart the animation.
If true, then the animation will have no duration. Instead, the animation will advance one frame each time a frame is rendered to the screen. This synchronizes it with the painting rate as opposed to elapsed time.
If frameSync is set to true, it overrides both frameRate and frameDuration.
Default is false.
Changing this parameter will restart the animation.
Width of a single frame in this AnimatedSprite.
May be omitted if it is the only sprite in the file.
The X coordinate in the image file of the first frame of the AnimatedSprite.
May be omitted if the first frame starts in the upper left corner of the file.
The Y coordinate in the image file of the first frame of the AnimatedSprite.
May be omitted if the first frame starts in the upper left corner of the file.
If true, interpolation will occur between sprite frames to make the animation appear smoother.
Default is true.
 Negative values are invalid.
If this is set to AnimatedSprite.Infinite the animation will not stop playing on its own.
Default is AnimatedSprite.Infinite
source : url |
The image source for the animation.
If frameHeight and frameWidth are not specified, it is assumed to be a single long row of square frames. Otherwise, it can be multiple contiguous rows or rectangluar frames, when one row runs out the next will be used.
If frameX and frameY are specified, the row of frames will be taken with that x/y coordinate as the upper left corner.


---
title: Sounds
---
{% include takatsuka.html %}
{% for sound in site.data.soundcloud limit:2 %}
{% include sound-cell.html id = sound.id location = sound.location engineer = sound.engineer date = sound.date license = sound.license license_url = sound.license_url width = 6 %}
{% endfor %}
{% for sound in site.data.soundcloud limit:4 offset:2 %}
{% include sound-cell.html id = sound.id location = sound.location engineer = sound.engineer date = sound.date license = sound.license license_url = sound.license_url width = 3 %}
{% endfor %}
{% for sound in site.data.soundcloud limit:4 offset:6 %}
{% include sound-cell.html id = sound.id location = sound.location engineer = sound.engineer date = sound.date license = sound.license license_url = sound.license_url width = 3 %}
{% endfor %}


Man dies in fire
by Jojo C. MagsombolNASUGBU, Batangas – A man who was sleeping on the second floor of a rest house here died after he was burned in a fire on All Saints’ Day.
Police identified the fatality, who suffered third-degree burns, as Renato Fidel Velasco.
Initial investigation showed that at around 11:39 a.m., the vctim’s relative, Zusima Velasco, and a housemaid were in the dirty kitchen on the first floor when they noticed a cloud of smoke. Upon checking, they saw the second floor on fire so they called the attention of Renato Velasco who was asleep in a room.
Personnel of the Bureau of Fire Protection, MDDRMO of this town and the Nasugbu municipal police station immediately responded to rescue the victims.
They found Velasco lying with burns all over his body so they rushed him to Jabez Medical Center but he was declared dead on arrival by the attending physician, Dra. Marivic Casiw.
Authorities are still investigating the cause of fire.


Most of the command-line utilities described in this section are either included in the JDK or native operating system tools and utilities. Although the JDK command-line utilities are included in the JDK download, it is important to consider that they can be used to diagnose issues and monitor applications that are deployed with the Java Runtime Environment (JRE).
In general, the diagnostic tools and options use various mechanisms to obtain the information they report. The mechanisms are specific to the Virtual Machine (VM) implementation, operating systems, and release. Frequently, only a subset of the tools is applicable to a given issue at a particular time. Command-line options that are prefixed with -XX
are specific to Java HotSpot VM. For more information about command-line options used by Java HotSpot VM, see Java HotSpot VM Command-Line Options.
|
Note: The-XX options are not part of the Java API and can vary from one release to the next. |
The tools and options are divided into several categories, depending on the type of problem that you are troubleshooting. Certain tools and options might fall into more than one category.
Postmortem diagnostics. These tools and options can be used to diagnose a problem after an application has crashes. See Postmortem Diagnostics Tools.
Hung processes. These tools can be used to investigate a hung or deadlocked process. See Hung Processes Tools.
Monitoring. These tools can be used to monitor a running application. See Monitoring Tools.
Other. These tools and options can be used to help diagnose other issues. See Other Tools, Options, Variables and Properties.
|
Note: Some command-line utilities described in this section are experimental. Thejstack , jinfo , and jmap utilities are examples of utilities that are experimental. The jcmd is a new JDK profiling utility in JDK 8. It is suggested to use the latest diagnostic utility, jcmd instead of the earlier jstack , jinfo, and jmap utilities. |


(Color online) (A) DOS comparison for the oxygen monovacancy on anatase (101) by using AE–LCAO (HSE) with four and five trilayers (B) Band gap for the oxygen monovacancy on anatase (101) by using AE–LCAO (HSE) with BS2 and BS3. (C) Band gap for an hydrogen adsorption and oxygen monovacancy on anatase (101) by using AE–LCAO (HSE) with BS3.


Imagine we need to solve a problem: Write a function that can reduce every element in a large sequence of number(let’s say the size is 10,000,000 and it is a parameter) by 10. Let’s assume we are only able to finish this task with pure Python at this point. The following is our code. We nailed it and the runtime (1.2 ms) was pretty good.
def pure_python(vec_size):
vec_list = list(range(vec_size))
result = [vec_list[i] / 10 for i in range(vec_size)]
return result
vec_size = 10000000
# one way to show the function runtime
%timeit pure_python(vec_size) # 1.24 s ± 11.2 ms per loop (mean ± std. dev. of 7 runs, 1 loop each)
However, our supervisor said: “No, this is not what I want. You have to redo your work.” We were shocked just like Mr.Bean.
(GIF source)
We asked him for help. The supervisor suggested that NumPy (short for Numerical Python, which is a package for scientific computing) might be helpful to this task. We searched NumPy package online and went through some tutorials for about 30 minutes and finally survived. The runtime (41 ms) was much faster than the previous one.
Wow, NumPy is an amazing package. Let’s dive into each line of the above code and see what NumPy can do to improve the computing performance.
To complete this task, the first thing is to create a sequence of number, we can do it as follows.
Traditionally, we create a list
using pure Python.
vec_list = list(range(vec_size))
print(vec_list) # [0, 1, 2, ..., 9999999]
type(vec) # list
What we can do something to improve the runtime? What about changing list
type? Yes, we actually create a NumPy array
using NumPy.
vec_array = np.arange(vec_size)
print(vec_array) # [0 1 2 ... 9999999]
type(vec) # numpy.ndarray
What’s the difference between them? We call Python list a dynamic-type list [1]. It means it can handle data of flexible types. Let’s say we want to assign a str
to the second element of the list.
vec_list[1] = 'Aha'
print(vec_list) # [0, 'Aha', 1, ..., 9999999]
But if we apply the same change to the NumPy array, we will find that all elements have the same type str
.
vec_array[1] = 'Aha'
print(vec_array) # ['0' 'Aha' '1' ... '9999999']
It means that NumPy array doesn’t keep the original information of each element except the value. Rather it tries to make sure every item has the same type. In this case, it keeps the same type by changing int
into str
. We call it a fixed-type array [1].
From the code above, we can find that list has more flexible data types than NumPy array. However, this flexibility could cause some issues. A list not only stores the value of each item but uses a large amount of space to keep other information that allows the data of different types at the expense of runtime. So, if the data we want to deal with hold the same data type, using Python list might not be efficient because it contains much extra information that is useless. Instead, NumPy array doesn’t have to store extra information and uses less space to store data so that it’s a more efficient way in this case [2].
After creating the sequence, we need to divide each element by 10. We can finish this part using a for loop, which goes through each element in the list and reduces it by 10. This step repeats 10000000 times.
Let’s try to write more efficient code.
Why? Because we use a trick called Ufunc(Universal function for short) in NumPy, which allows elementwise calculations [1]. It means that when we divide the array by 10, it actually is a NumPy array that has the same size as the given array but each element is 10. Thus, the program will be run just once.
result = [0 1 ... 9999999] / [10 10 ... 10]
The following is the complete version using NumPy.
def numpy_python(vec_size):
vec_array = np.arange(vec_size)
result = vec_array / 10
return result
At this point, we should acquire two things: one is creating a NumPy array, the other is doing elementwise operations using Ufunc instead of control flow.
What else? If we want to add two arrays of different sizes, we can easily calculate them using broadcasting [1]. What broadcasting does is similar to Ufunc but with some special shape matching steps.
Let’s say we want to add two arrays a
and b
.
a = np.array([1,2])
a.shape() # check the shape of array, in this case, the shape is (2,)
b = np.ones((2,1)) # create an array with size of (2,1) and every element in the array is 1
b.shape() # (2, 1)
s = a + b
print(s)
# array([[2, 3],
[2, 3]])
We see that the resulting array has the size of (2, 2). If we add two list of different sizes, the code will throw an error.
So, what’s the shape matching steps?
- Because
a
has the size of (2,), this means a
is a 1D array. In this case, the shape of a
need to be changed to (1,2) because b
is a 2D array.
a.shape(): (2, ) ---> (1, 2)
a
has the shape of (1, 2) and b
has the shape of (2, 1). If we want to add them, the shape must be the same. So, we need to stretch the row of a
to be 2 and the column of b
to be 2.
a.shape(): (1, 2) ---> (2, 2)
b.shape(): (2, 1) ---> (2, 2)
If none of the arrays has a ‘1’ in their shapes, the broadcasting won’t work.
Let’s recap what we covered in this blog:
- - Explain the difference between
list
and NumPy array
.
- - Introduce a NumPy trick called Ufunc, which can replace control flow in some cases.
- - Introduce another useful function called broadcasting in NumPy to help us deal with some operations between two arrays of different sizes.
NumPy package is too big to cover in a single blog, so I just introduce some of the ideas in this post. If some of you want to dig more into it, there are lots of online resources about NumPy. Finally, hope you enjoy this post! Stay tuned!
Reference:
- Python Data Science Handbook
- Python Lists vs. Numpy Arrays - What is the difference?
#python
#numpy
#data science
- September 15, 2018
- by Jason Chen
- python, numpy, data science


ESM 206 MATERIALS (FALL 2019)
Course description: Develop critical thinking, technical and communication skills to successfully approach and answer environmental questions using quantitative and qualitative data. Topics include: data wrangling using the tidyverse and tidy data principles, exploratory data analysis and visualization, descriptive statistics, uncertainty, hypothesis testing, data visualization and communication. Best practices for reproducibility, version control and collaboration are emphasized throughout. Skills will be developed through wrangling, analysis and communication of datasets using R, RStudio and GitHub.
Course goals:
- Intro to R/RStudio
- Data wrangling with the tidyverse
- Data visualization with ggplot2
- Exploratory data analysis
- Summary statistics and hypothesis testing
- Regression (linear, logistic)
- Reproducible workflows for collaborative data science
ESM 206 course syllabus (Fall 2019)
ESM 206 Code of Conduct
| 0 |
During orientation: get started with R, RStudio and GitHub |
Get R/RStudio and the tidyverse Get started with Git/GitHub | None |
| 1 |
Lecture 1: Course intro; computational reproducibility; R & RStudio
Lecture 2: Naming things; tidy data; basic troubleshooting and getting help with R |
Lab 1: Meet RStudio, projects, scripts, basic reading & wrangling, intro to ggplot2 | Broman & Woo "Data organization in spreadsheets
Lowndes et al. "Our path to better science in less time using open data science tools" |
|
| 2 |
Lecture 3: Code style tips; intro to R Markdown
Lecture 4: Version control with Git & GitHub overview; exploratory data visualization |
Lab 2: Intro to R Markdown, data wrangling continued, tidyr::pivot_*, joins, and customizing a ggplot graph | Wilson et al. "Good enough practices in scientific computing"
Chapters 4 - 7 in "Fundamentals of Data Visualization" by Claus O. Wilke |
| 3 |
Lecture 5: Data visualization Part 1 Lecture 6: Data visualization Part 2 |
Lab 3: Data visualization, dplyr::case_when(), purrr::modify_if(), writing files & saving figures, {here} for file paths | Chapters 9 - 11 in "Fundamentals of Data Visualization" by Claus O. Wilke
Ch. 5 (Data Transformation) in R for Data Science by Grolemund & Wickham |
| 4 |
Lecture 7: Axis labels & figure captions; types of data; central tendency & data spread Lecture 8: |
Lab 4: Meet GitHub; work between RStudio & GitHub; tabs in markdown; interactive graphs & tables with plotly & DT; annotate ggplots | No new reading - catch up on previous weeks & study for midterm |
| 5 |
Lecture 9: Lecture 10: |
Lab 5: | Week 5 reading |
| 6 |
Lecture 11: Lecture 12: |
Lab 6: | Week 6 reading |
| 7 |
(Monday holiday) Lecture 13:
|
Lab 7: | Week 7 reading |
| 8 |
Lecture 14: Lecture 15: |
Lab 8: | Week 8 reading |
| 9 |
Lecture 16: (No lecture Wednesday)
| Lab 9: Take-home | Week 9 reading |
| 10 |
Lecture 17: Lecture 18: |
Lab 10: |
Course resources:
ESM 206 ARCHIVES


How it All Began!
It’s a typical day in the sunshine state.  As you’re pulling the drawstring to the point that the bag itself starts stretching itself, you’re debating on whether to double bag it. You take the risk and rush out the door. As you start trotting downstairs from your apartment, the bag feels lighter.  Then it starts to rain. After damage control and cleaning yourself up to avoid smelling like an entire dirty litter, consider yourself late for work.
This is where the idea for GOMI originated. It serves as a multi-functional tool designed to alleviate tension and lighten the load for certain aspects of everyday life. Small enough to conveniently store when not in use, but durable enough to get the job done.


The following table shows the price details of the assets in the algorithm:
| Asset | Price ($) | Strike ($) |
|---|---|---|
| Put | 1.37 | 185.00 |
| Underlying Equity at start of the trade | 186.94 | - |
| Underlying Equity at expiration | 190.01 | - |
Therefore, the payoff is
$$ \begin{array}{rcll} P^{K}_T & = & (K - S_T)^{+}\\ & = & (185 - 190.01)^{+}\\ & = & 0\\ P_T & = & (S_0 - S_T + P^{K}_0 - P^{K}_T)\times m - fee\\ & = & (186.94 - 190.01 + 1.37 - 0)\times m - fee\\ & = & -1.70 \times 100 - 2\\ & = & -172 \end{array} $$So, the strategy loses $172.
The following algorithm implements a covered put strategy:


HOME
Common Wealth Games
Eid
India vs England
Gaza Attack
XiaomiMi3
ScreenShots
About Us
A bigger number means the more users From The Country tweeted positively meaning they where happy and vice versa
Gaza Menu
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Hash Tags
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Some very common programming languages in use today are C++, PHP, JavaScript, and SQL.
Each of these languages is quite unique and are used both in hobby and commercial projects around the world.
The extensive use of these languages means that it is critical for software developers to either know the languages or be familiar with them.


Copyright © 2016 Mark R. Greenstreet
Authors: Mark R. Greenstreet (mrg@cs.ubc.ca).
broadcast
, reduce
and scan
to operate on such trees.
The receive
operations in reduce
and
scan
include a time-out that by default is set to
'infinity'
(i.e., they'll hang forever if the expected
message is never received). This value can be changed for all
workers in a worker_pool by the set_debug_timout
function.
| alive/1 | Equivalent to workers:alive. |
| barrier/1 | A barrier for worker-pool W . |
| broadcast/3 | Invoke Task on all workers. |
| children/1 | Return a list of the children of this process. |
| create/0 | Create a worker-pool with the default number of processes and initialize them to support the tree operations of this module. |
| create/1 | Create a worker-pool of N processes and
initialize them to support the tree operations of this module. |
| default_debug_timeout/0 | Equivalent to workers:get_debug_timeout(). |
| get/2 | Equivalent to workers:get(ProcState, Key). |
| get/3 | Equivalent to workers:get(ProcState, Key, Default). |
| get_debug_timeout/1 | Equivalent to workers:get_debug_timeout(ProcState). |
| init/1 | Initialze the process state of the workers of W
to support the tree operations of this module. |
| nworkers/1 | Equivalent to workers:nworkers(W). |
| put/2 | Equivalent to workers:put(ProcState, TupleList). |
| put/3 | Equivalent to workers:put(ProcState, Key, Value). |
| reap/1 | Equivalent to workers:reap(W). |
| reduce/3 | Equivalent to reduce(W, Leaf, Combine, fun (X) -> X end). |
| reduce/4 | A generalized reduce operation. |
| rlist/3 | Equivalent to workers:rlist(W, N, Key). |
| rlist/4 | Equivalent to workers:rlist(W, N, M, Key). |
| scan/5 | A generalized scan operation. |
| set_debug_timeout/2 | Equivalent to workers:set_debug_timeout(W, T). |
alive(W) -> any()
Equivalent to workers:alive.
barrier(W) -> ok
A barrier for worker-pool W
.
broadcast(W, Task, Args) -> ok
Invoke Task
on all workers.
W
is a worker_pool
.Task
is a function. If
Task
has an arity of two, then it is invoked as
Task(ProcState, Arg)
ProcState
is the current state of the
worker process, andArg
is the N
th element
of Args
when Task>
is invoked for
the N
th worker of W
.Task
has an arity of three, then it is invoked as
Task(ProcState, Arg, N)
ProcState
, Arg
, and N
are as defined above.
Task
becomes the new state of
the process.
children(ProcState::worker_state()) -> [{integer(), pid()}]
Return a list of the children of this process.
The tree
create() -> worker_pool()
Create a worker-pool with the default number of processes and initialize them to support the tree operations of this module.
create(N::integer()) -> worker_pool()
Create a worker-pool of N
processes and
initialize them to support the tree operations of this module.
default_debug_timeout() -> integer()
Equivalent to workers:get_debug_timeout().
get(ProcState, Key) -> term()
Equivalent to workers:get(ProcState, Key).
get(ProcState, Key, Default) -> term()
Equivalent to workers:get(ProcState, Key, Default).
get_debug_timeout(ProcState) -> integer()
Equivalent to workers:get_debug_timeout(ProcState).
init(W::worker_pool) -> worker_pool()
Initialze the process state of the workers of W
to support the tree operations of this module.
nworkers(W) -> any()
Equivalent to workers:nworkers(W).
put(ProcState, TupleList) -> NewProcState
Equivalent to workers:put(ProcState, TupleList).
put(ProcState, Key, Value) -> NewProcState
Equivalent to workers:put(ProcState, Key, Value).
reap(W) -> any()
Equivalent to workers:reap(W).
reduce(W, Leaf, Combine) -> term()
Equivalent to reduce(W, Leaf, Combine, fun (X) -> X end).
reduce(W, Leaf, Combine, Root) -> term2()
A generalized reduce operation.
The Leaf()
function is applied in each worker.
The results of these are combined, using a tree,
using Combine
.
The Root
function is applied to the final result
from the combine tree to produce the result of this function.
Note: The workers are ordered. In particular, if one were
to invoke update(W, 'WID', lists:seq(1:Nworkers)
then all of the workers contributing to the Left
argument will have 'WID'
values less than those
contributing to the Right
. This interface says
nothing about whether or not the trees are balanced. This means
that to get deterministic results, Combine
should
be an associative
function.
rlist(W, N, Key) -> ok
Equivalent to workers:rlist(W, N, Key).
rlist(W, N, M, Key) -> ok
Equivalent to workers:rlist(W, N, M, Key).
scan(W, Leaf1, Leaf2, Combine, Acc0) -> term1()
A generalized scan operation.
The Leaf1()
function is applied in each worker process.
The results of these are combined, using a tree,
using Combine
.
Let ReduceValue
denote the result of applying the Combine
function at the root.
If Acc0
is not a function of arity 1, the value of Acc0
is used as the initial accumulator for the left subtree, and
scan(...)
returns ReduceValue
.
If Acc0
is a function of arity-1, let
{ReturnValue, RootValue} = Acc0(ReduceValue). In this case, RootValue
is used as the initial accumulator for the left subtree, and
scan(W, Leaf1, Leaf2, Combine, Acc0)
returns ReturnValue
.
Results are propagated back down the tree.
The Leaf2()
function is applied in each
worker process. The AccIn
argument is the result
of the Combine
for everything to the left of this
node in the tree. For the leftmost process, Acc0
is used. The return value of Leaf2
becomes the
state of the worker process.
set_debug_timeout(W, T) -> ok
Equivalent to workers:set_debug_timeout(W, T).
Generated by EDoc, Jan 25 2017, 12:13:16.


--- layout: post published: true title: Travelling Salesman Problem mathjax: false featured: true comments: false categories: - Math - Genetic Algorithms - Machine Learning - LSTM - Deep Learning tags: 'Math, Genetic Algorithms, Machine Learning, LSTM, Deep Learning' ---
Here is a teaser: ... of nothing.
Did this work? Apparently not. I've got errors to sort out. This is what I get for hodge-podging this code togethr.


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--- layout: post title: BluePorn date: 2004-06-08 00:00:00 category: mobile ---
My God.
Last night, I was "bluejacked" on the train...
...with what looked like amateur porn.


Stock Exchange Admin Page
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We are car doctors.
We work for them who are enthusiastic about their cars.
We work with antique cars too !
We'd love to hear from you as well.
Car repair workshop. We work for them who are enthusiastic about their cars.
We have started the state of the art mechanical workshop for those people who are really concerned about their cars. All the computerized Engine tuning is available under one roof.
Engine tuning, Brake service, Computerized check up, Engine overhauling, All mechanical work related to new or used car/ Denting painting.


Tutorials Point is a place for beginners in all technical areas. This website covers most of the latest technoligies and explains each of the technology with simple examples. You also have a tryit editor, wherein you can edit your code and try out different possibilities of the examples.
iOS is a mobile operating system developed and distributed by Apple Inc. Originally released in 2007 for the iPhone, iPod Touch, and Apple TV. iOS is derived from OS X, with which it shares the Darwin foundation. iOS is Apple's mobile version of the OS X operating system used on Apple computers.
jMeter is an Open Source testing software. It is 100% pure Java application for load and performance testing.
Enterprise Java Beans (EJB) is a development architecture for building highly scalable and robust enterprise level applications to be deployed on J2EE compliant Application Server such as JBOSS, Web Logic etc.


--- layout: post title: Quickly create an empty stdClass object in PHP description: For when you need the scaffolding of an empty PHP class object date: 2013-04-19 12:00:00 headerImage: img/flickr-theonewithout-norway-shoes.png tags: ["tech", "php"] ---
I was working on a Laravel project and had to work with a Eloquent ORM object; I then needed to create an empty stdClass object.
There's a chance that a person is not known and being lazy I wanted to fill the form anyway with my Person object, so I needed a mockup of that object.
{{< highlight php >}} {{< /highlight >}}I'd say this solution is quick and dirty.. but frankly, it's not that dirty at all!
In short, this one-liner, creates an array with the 4 keys provided and gives them an empty value (''
) then we just typecast it into an object. Done!


Uses of Interface
org.apache.shiro.util.Destroyable
-
Packages that use Destroyable Package Description <Unnamed> org.apache.shiro.cache Caching support used to enhance performance for security operations.org.apache.shiro.cache.ehcache Ehcache-based implementations of Shiro's cache interfaces.org.apache.shiro.cache.jcache org.apache.shiro.env Concepts used to represent Shiro's aggregate state in an application.org.apache.shiro.guice org.apache.shiro.guice.web org.apache.shiro.hazelcast.cache org.apache.shiro.mgt Provides the masterSecurityManager
interface and a default implementation hierarchy for managing all aspects of Shiro's functionality in an application.org.apache.shiro.realm.text Realms that acquire security data from text-based data sources such asFile
s or text streams.org.apache.shiro.session.mgt SessionManager
components supporting enterprise session management.org.apache.shiro.util Your run-of-the-mill 'util' package for components and logic widely used across the framework that can't find their home into a proper OO hierarchy (or, most likely for things used across many hierarchies).org.apache.shiro.web.env Web-specificEnvironment
implementation and support.org.apache.shiro.web.mgt Components supporting web-specificSecurityManager
implementations.org.apache.shiro.web.session.mgt -
-
Uses of Destroyable in <Unnamed>
Classes in <Unnamed> that implement Destroyable Modifier and Type Class Description class
QuickstartShiroModule
-
Uses of Destroyable in org.apache.shiro.cache
Classes in org.apache.shiro.cache that implement Destroyable Modifier and Type Class Description class
AbstractCacheManager
Very simple abstractCacheManager
implementation that retains all createdCache
instances in an in-memoryConcurrentMap
.class
MemoryConstrainedCacheManager
Simple memory-only basedCacheManager
implementation usable in production environments. -
Uses of Destroyable in org.apache.shiro.cache.ehcache
Classes in org.apache.shiro.cache.ehcache that implement Destroyable Modifier and Type Class Description class
EhCacheManager
ShiroCacheManager
implementation utilizing the Ehcache framework for all cache functionality. -
Uses of Destroyable in org.apache.shiro.cache.jcache
Classes in org.apache.shiro.cache.jcache that implement Destroyable Modifier and Type Class Description class
JCacheManager
ShiroCacheManager
implementation utilizing JCache for all cache functionality. -
Uses of Destroyable in org.apache.shiro.env
Classes in org.apache.shiro.env that implement Destroyable Modifier and Type Class Description class
BasicIniEnvironment
Basic usage:class
DefaultEnvironment
Simple/defaultEnvironment
implementation that stores Shiro objects as key-value pairs in aMap
instance. -
Uses of Destroyable in org.apache.shiro.guice
Classes in org.apache.shiro.guice that implement Destroyable Modifier and Type Class Description class
ShiroModule
Sets up Shiro lifecycles within Guice, enables the injecting of Shiro objects, and binds a defaultSecurityManager
andSessionManager
.Methods in org.apache.shiro.guice with parameters of type Destroyable Modifier and Type Method Description void
ShiroModule. add(Destroyable destroyable)
-
Uses of Destroyable in org.apache.shiro.guice.web
Classes in org.apache.shiro.guice.web that implement Destroyable Modifier and Type Class Description class
ShiroWebModule
Sets up Shiro lifecycles within Guice, enables the injecting of Shiro objects, and binds a defaultWebSecurityManager
,SecurityManager
andSessionManager
. -
Uses of Destroyable in org.apache.shiro.hazelcast.cache
Classes in org.apache.shiro.hazelcast.cache that implement Destroyable Modifier and Type Class Description class
HazelcastCacheManager
ACacheManager
implementation backed by Hazelcast, "an open source clustering and highly scalable data distribution platform for Java" -
Uses of Destroyable in org.apache.shiro.mgt
Classes in org.apache.shiro.mgt that implement Destroyable Modifier and Type Class Description class
AuthenticatingSecurityManager
Shiro support of aSecurityManager
class hierarchy that delegates all authentication operations to a wrappedAuthenticator
instance.class
AuthorizingSecurityManager
Shiro support of aSecurityManager
class hierarchy that delegates all authorization (access control) operations to a wrappedAuthorizer
instance.class
CachingSecurityManager
A very basic starting point for the SecurityManager interface that merely provides logging and caching support.class
DefaultSecurityManager
The Shiro framework's default concrete implementation of theSecurityManager
interface, based around a collection ofRealm
s.class
RealmSecurityManager
Shiro support of aSecurityManager
class hierarchy based around a collection ofRealm
s.class
SessionsSecurityManager
Shiro support of aSecurityManager
class hierarchy that delegates allsession
operations to a wrappedSessionManager
instance. -
Uses of Destroyable in org.apache.shiro.realm.text
Classes in org.apache.shiro.realm.text that implement Destroyable Modifier and Type Class Description class
PropertiesRealm
ATextConfigurationRealm
that defers all logic to the parent class, but just enablesProperties
based configuration in addition to the parent class's String configuration. -
Uses of Destroyable in org.apache.shiro.session.mgt
Classes in org.apache.shiro.session.mgt that implement Destroyable Modifier and Type Class Description class
AbstractValidatingSessionManager
Default business-tier implementation of theValidatingSessionManager
interface.class
DefaultSessionManager
Default business-tier implementation of aValidatingSessionManager
. -
Uses of Destroyable in org.apache.shiro.util
Methods in org.apache.shiro.util with parameters of type Destroyable Modifier and Type Method Description static void
LifecycleUtils. destroy(Destroyable d)
-
Uses of Destroyable in org.apache.shiro.web.env
Classes in org.apache.shiro.web.env that implement Destroyable Modifier and Type Class Description class
DefaultWebEnvironment
DefaultWebEnvironment
implementation based on a backingMap
instance.class
IniWebEnvironment
class
ResourceBasedWebEnvironment
Abstract implementation forWebEnvironment
s that can be initialized via resource paths (config files). -
Uses of Destroyable in org.apache.shiro.web.mgt
Classes in org.apache.shiro.web.mgt that implement Destroyable Modifier and Type Class Description class
DefaultWebSecurityManager
DefaultWebSecurityManager
implementation used in web-based applications or any application that requires HTTP connectivity (SOAP, http remoting, etc). -
Uses of Destroyable in org.apache.shiro.web.session.mgt
Classes in org.apache.shiro.web.session.mgt that implement Destroyable Modifier and Type Class Description class
DefaultWebSessionManager
Web-application capableSessionManager
implementation.
-


Totally Trivial Trivia!!!
Click Start to begin the game.
Time Remaining:
What is the capitol of Columbia?
Bogota
Cartagena
Medellin
Cali
What country produces the most mangoes?
India
Cuba
Brazil
Cali
How many dimples does an average golf ball have?
336
500
250
450


Group name: {% if group.name %}{{ group.name }}{% else %}
Not set{% endif %}
{% if group.charityshopchallengesubmission_set.all %}
Charity Shop Challenge Submissions:
{% for charity_shop_challenge_submission in group.charityshopchallengesubmission_set.all %}
{% if charity_shop_challenge_submission.photo %}
{% endif %}
{{ charity_shop_challenge_submission.description }}
{% endfor %}
{% else %}
Charity Shop Challenge not submitted.
{% endif %}
Your group name is visible to all freshers participating in City Challenge, all helpers and ECSS committee. Your submissions is visible to your group members and ECSS committee. Your submissions might be used for other part of the Jumpstart event or future Jumpstart events.


man page
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**man page**: n.
A page from the Unix Programmer's Manual, documenting one of Unix's many
commands, system calls, library subroutines, device driver interfaces,
file formats, games, macro packages, or maintenance utilities. By
extension, the term “man page” may be used to refer to documentation of
any kind, under any system, though it is most likely to be confined to
short on-line references.
As mentioned in `Chapter 11, *Other Lexicon
Conventions* <../conventions.html>`__, there is a standard syntax for
referring to man page entries: the phrase “foo(n)” refers to the page
for “foo” in chapter n of the manual, where chapter 1 is user commands,
chapter 2 is system calls, etc.
The man page format is beloved, or berated, for having the same sort of
pithy utility as the rest of Unix. Man pages tend to be written as very
compact, concise descriptions which are complete but not forgiving of
the lazy or careless reader. Their stylized format does a good job of
summarizing the essentials: invocation syntax, options, basic
functionality. While such a concise reference is perfect for the
do-one-thing-and-do-it-well tools which are favored by the Unix
philosophy, it admittedly breaks down when applied to a command which is
itself a major subsystem.
--------------
+----------------------------+----------------------------+-------------------------------+
| `Prev `__ | `Up <../M.html>`__ | `Next `__ |
+----------------------------+----------------------------+-------------------------------+
| malware | `Home <../index.html>`__ | management |
+----------------------------+----------------------------+-------------------------------+


Line Grinder
Excellon File to Drill GCode Software
Excellon File Managers
The Line Grinder Excellon File Manager
What Do Excellon File Managers Do
Excellon File Managers produce the GCode which drill the pad holes and vias in the PCB. This automates the task of manually drilling the holes with a drill press and hence reduces the breakage of drill bits (they are very thin). Excellon GCode is created from the Excellon drill file contents by associating a File Manager with an OperationMode of type Excellon with the file. The association is performed by setting the FileNamePattern field of the File Manager to all or part of the Excellon files name.
Since there can be many different hole sizes on a PCB, the generated Drilling GCode contains commands to stop the bit and prompt the operator for a tool change whenever a different size of drill bit is required.
The configuration items for Excellon File Managers are:
General Category
- OperationMode
- This value determines the type of GCode the File Manager will create from the GCode file it processes. This value is set when the File Manager is created and cannot be changed.
- FilenamePattern
- A part of a Excellon file name. When the Excellon file is opened, the list of File Managers will be searched and the first File Manager found which has a FilenamePattern value contained within the name of the Excellon file will be used to process that file. The standard wild cards of * and % should not be used.
- Description
- A user-defined configuration item that can be used as brief documentation to describe the purpose of the File Manager.
File Manager Category
- AutoGenerateGCode
- If enabled, the GCode file can be automatically generated when the file is opened. If this value is False then the GCode must be generated after the file is opened by pressing the Convert to GCode button found on the main form.
- ShowGCodeLineNumbers
- If enabled, old style line numbers will be placed in the GCode file. This option is offered for completeness since line numbers in the GCode file almost never necessary or wanted.
- WarnAboutOverwriting
- Normally the Line Grinder will issue an warning message if the GCode file you are about to save already exists. This warning can be disabled by setting this option to False.
Excellon Drilling Category
- DrillingGCodeEnabled
- If this value is set to True then the GCode which drills the pad and via holes will be generated when the Generate GCode button on the main form is pressed.
- DrillingCoordinateZerosMode
- Excellon files do not, according to most standards, place decimal points in the coordinates they encode. The proper interpretation and scaling of the coordinates is expected to be done by the software that processes the file. This value indicates how to process the coordinate data. If the mode is FixedDecimalPoint then the software assumes that there are DrillingNumberOfDecimalPlaces of decimal places in each coordinate. The mode of OmitLeadingZeros assumes that any leading zeros have been removed, and these will be added back on before the DrillingNumberOfDecimalPlaces of value is used to scale the number. Note that some Excellon files store values in a OmitTrailingZeros mode. This type of encoding is not supported.
- DrillingNumberOfDecimalPlaces
- This value should indicate the number of decimal places each coordinate should use. Most Excellon files do not use decimal points in the coordinates and expect the processing software to scale the numbers.
- DrillingGCodeFileOutputExtension
- When the generated Excellon GCode file is saved, the existing filename extension will be removed and this value substituted in its place.
- DrillingZDepth
- This is the depth, in Application Units, to which the toolhead will be driven through the PCB material in order to drill the PCB holes. This value should be negative (zero is traditionally the surface of the PCB) and should be deep enough to place the end of the bit through the bottom of the PCB. Obviously you are not going to want to be drilling into the bed of your mill, so the PCB is usually mounted on a "throw-away" piece of wood.
- DrillingZClearLevel
- This is the height above the PCB at which the toolhead moves quickly in order to get into position. It should be positive because it is above the surface of the PCB and high enough to clear all hold downs and other clamping material.
- DrillingZFeedRate
- This is the speed (in Application Units per minute) at which the toolhead will drive the drill bit into the PCB.
- DrillingXYFeedRate
- This is the speed (in Application Units per minute) at which the toolhead moves from place to place between the drill holes. If it is too slow then the drilling operations will take longer than necessary.


I never thought I can create a mobile apps so easily. I love programming now.
Mohit Ranjan, Kendriya Vidyalaya, IIT Powai
Maths Quiz app by Mohit
It was a great learning experience, I enjoyed a lot. The best part was I created my own apps.
Nirav Anney, Oberoi International School
Catch me if you can by Nirav


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TI-82 Link Protocol Guide v1.0 - Silent Variable Transfers
"Silent Linking" is a capability that Texas Instruments built into the TI-83, TI-83+, TI-86, TI-89, TI-92 and TI-92+. It enables the calculator to transfer data to and from a computer without any special preparation required on the calculator end. The only drawback to the silent linking method is that when using this protocol, the calculator will automatically overwrite any data in a variable that has the same name as one being sent to it. Any program that incorporates silent linking must check for this; otherwise data may be lost.
Because silent linking protocols are one-sided (i.e. the user interaction is solely on the computer), there are three different transfer sequences required. First a directory listing must be downloaded from the calculator in order to choose the variables to transfer or to check for duplicate names and out-of-memory conditions. Then, if variables are to be downloaded, a variable request action must be initiated by the computer. Finally, if variables are to be uploaded, a request-to-send action must be sent by the computer.
The TI-82 does not have the directory listing feature, and therefore does not support full silent linking. Nevertheless, the TI-82 implements two silent linking commands for use with the CBL/CBR:
The protocol for requesting and receiving a variable from the calculator is shown below.
| Step | Direction | Packet | ||
|---|---|---|---|---|
|
1 |
|
|
|
REQ with expected header |
|
2 |
|
ACK | ||
|
3 |
|
VAR with actual header | ||
|
4 |
|
ACK | ||
|
5 |
|
CTS or SKIP/EXIT - if exit, quit. | ||
|
6 |
|
ACK | ||
|
7 |
|
DATA | ||
|
8 |
|
ACK |
As with manual transfers, the data section contains the variable data. For information on variable formats, click here.
Example:
| PC: | 02 A2 0B 00 00 00 00 41 00 00 00 00 00 00 00 41 00 | Request Real Number "A" |
| TI: | 82 56 00 00 | Acknowledgement of request |
| 82 06 0B 00 09 00 00 41 00 00 00 00 00 00 00 4A 00 | Variable Header: Real Number "A" | |
| PC: | 02 56 00 00 | Acknowledgement of variable header |
| 02 09 00 00 | Clear to send variable | |
| TI: | 82 56 00 00 | Acknowledgement of CTS |
| 82 15 09 00 00 80 12 56 34 78 85 25 55 93 02 | Variable data: "1.2563478852555" | |
| PC: | 02 56 00 00 | Acknowledgement of variable data |
The protocol for sending a variable from the calculator to a computer or CBL/CBR is shown below.
| Step | Direction | Packet | ||
|---|---|---|---|---|
|
1 |
|
|
|
RTS |
|
2 |
|
ACK | ||
|
3 |
|
CTS | ||
|
4 |
|
ACK | ||
|
5 |
|
DATA | ||
|
6 |
|
ACK |
Examples:
| TI: | 82 C9 0B 00 09 00 00 41 00 00 00 00 00 00 00 4A 00 | Request to send Real Number "A" |
| PC: | 02 56 00 00 | Acknowledgement of request |
| 02 09 00 00 | Clear to send variable | |
| TI: | 82 56 00 00 | Acknowledgement of CTS |
| 82 15 0A 00 00 80 12 56 34 78 85 25 55 93 02 | Variable data: "1.2563478852555" | |
| PC: | 02 56 00 00 | Acknowledgement of data |


--- layout: post title: "My Week in Review" date: 2019-02-17 15:20:00 +0000 image: https://s3.amazonaws.com/audreywatters/2018-02-17-poop.jpg imagecredits: https://www.flickr.com/photos/look4u/286221689 ---
Another week where I’m going to skip giving an update on my word count. I did get some words written, but this week has mostly been about moving and packing. Next week doesn’t look to be much more productive either, as I’m traveling and speaking and then unpacking and assembly IKEA furniture. But then, we’ll be pretty much settled in Seattle, with my work space set up again. So onward…
While I haven’t been working too much on the book, I have used my free time to finalize a talk I’m giving at Austin Peay State University on Wednesday – and hopefully that talk will provide the basis for the introduction to Teaching Machines.
This past week: Seattle to HB. Upcoming week: HB to Clarksville, TN to Seattle.
Icon credits: The Noun Project


About Attention Passengers
Get MBTA train times and alerts sent to you by SMS.
Example queries:
Kendall inbound
Oak Grove to Chinatown
South station outbound
Current Limitations:
All Orange line stops
Red line stops from Alewife to JFK
We'll also tell you if the red line is on fire.


|
1-Wire API for .NET Version 4.00
|
1-Wire® Potentiometer interface class for basic potentiometer operations. More...
Inherits com::dalsemi::onewire::container::OneWireSensor.
Inherited by OneWireContainer2C.
Public Member Functions | |
| boolean | isLinear (byte[] state) |
| Querys to see if this Potentiometer 1-Wire Device has linear potentiometer element(s) or logarithmic potentiometer element(s). | |
| boolean | wiperSettingsAreVolatile (byte[] state) |
| Querys to see if this Potentiometer 1-Wire Device's wiper settings are volatile or non-volatile. | |
| int | numberOfPotentiometers (byte[] state) |
| Querys to see how many potentiometers this Potentiometer 1-Wire Device has. | |
| int | numberOfWiperSettings (byte[] state) |
| Querys to find the number of wiper settings that any wiper on this Potentiometer 1-Wire Device can have. | |
| int | potentiometerResistance (byte[] state) |
| Querys to find the resistance value of the potentiometer. | |
| int | getCurrentWiperNumber (byte[] state) |
| Gets the currently selected wiper number. | |
| void | setCurrentWiperNumber (int wiper_number, byte[] state) |
| Sets the currently selected wiper number. | |
| boolean | isChargePumpOn (byte[] state) |
| Determines if the Potentiometer's charge pump is enabled. | |
| void | setChargePump (boolean charge_pump_on, byte[] state) |
| Sets the state of the Potentiometer's charge pump. | |
| int | getWiperPosition () throws OneWireIOException, OneWireException |
| Gets the current wiper position of the Potentiometer. | |
| boolean | setWiperPosition (int position) throws OneWireIOException, OneWireException |
| Sets the wiper position of the potentiometer. | |
| int | increment (boolean reselect) throws OneWireIOException, OneWireException |
| Increments the wiper position by one. | |
| int | decrement (boolean reselect) throws OneWireIOException, OneWireException |
| Decrements the wiper position. | |
| int | increment () throws OneWireIOException, OneWireException |
| Increments the wiper position after selecting the part. | |
| int | decrement () throws OneWireIOException, OneWireException |
| Decrements the wiper position after selecting the part. |
1-Wire® Potentiometer interface class for basic potentiometer operations.
This class should be implemented for each potentiometer type 1-Wire device.
Currently there is only the DS2890, but it appears that plans have been made for more complex parts with more wipers, different possible number of wiper positions, etc.
The PotentiometerContainer methods can be organized into the following categories:
Display some features of PotentiometerContainer instance 'pc
':
byte[] state = pc.readDevice();
if (!(pc.isChargePumpOn()))
pc.setChargePump(true, state);
pc.writeDevice(state);
pc.setWiperPosition(127);
pc.increment();
pc.decrement();
| int decrement | ( | boolean | reselect | ) | throws OneWireIOException, OneWireException |
Decrements the wiper position.
| reselect | decrement() can be called without resetting the part if the last call was an increment() or decrement() . true if device is to be selected (must be called with true after any other 1-wire method) |
numberOfWiperPositions()
).| com.dalsemi.onewire.adapter.OneWireIOException | Data was not written correctly |
| com.dalsemi.onewire.OneWireException | Could not find device |
Implemented in OneWireContainer2C.
| int decrement | ( | ) | throws OneWireIOException, OneWireException |
Decrements the wiper position after selecting the part.
numberOfWiperPositions()
)| com.dalsemi.onewire.adapter.OneWireIOException | Data was not written correctly |
| com.dalsemi.onewire.OneWireException | Could not find device |
Implemented in OneWireContainer2C.
| int getCurrentWiperNumber | ( | byte[] | state | ) |
Gets the currently selected wiper number.
All wiper actions affect this wiper. The number of wipers is the same as numberOfPotentiometers()
.
| state | state buffer of the Potentiometer 1-Wire Device (returned by readDevice() ) |
Implemented in OneWireContainer2C.
| int getWiperPosition | ( | ) | throws OneWireIOException, OneWireException |
Gets the current wiper position of the Potentiometer.
The wiper position is between 0 and numberOfWiperPositions()
, and describes the voltage output.
numberOfWiperPositions()
| com.dalsemi.onewire.adapter.OneWireIOException | Data was not read correctly |
| com.dalsemi.onewire.OneWireException | Could not find device |
Implemented in OneWireContainer2C.
| int increment | ( | boolean | reselect | ) | throws OneWireIOException, OneWireException |
Increments the wiper position by one.
| reselect | increment() can be called without resetting the part if the last call was an increment() or decrement() . true if device is to be selected (must be called with true after any other 1-wire method) |
numberOfWiperPositions()
)| com.dalsemi.onewire.adapter.OneWireIOException | Data was not written correctly |
| com.dalsemi.onewire.OneWireException | Could not find device |
Implemented in OneWireContainer2C.
| int increment | ( | ) | throws OneWireIOException, OneWireException |
Increments the wiper position after selecting the part.
numberOfWiperPositions()
)| com.dalsemi.onewire.adapter.OneWireIOException | Data was not written correctly |
| com.dalsemi.onewire.OneWireException | Could not find device |
Implemented in OneWireContainer2C.
| boolean isChargePumpOn | ( | byte[] | state | ) |
Determines if the Potentiometer's charge pump is enabled.
| state | state buffer of the Potentiometer 1-Wire Device (returned by readDevice() ) |
true
if enabled, false
if not Implemented in OneWireContainer2C.
| boolean isLinear | ( | byte[] | state | ) |
Querys to see if this Potentiometer 1-Wire Device has linear potentiometer element(s) or logarithmic potentiometer element(s).
| state | state buffer of the Potentiometer 1-Wire Device (returned by readDevice() ) |
true
if this device has linear potentiometer element(s), false
if this device has logarithmic potentiometer element(s) Implemented in OneWireContainer2C.
| int numberOfPotentiometers | ( | byte[] | state | ) |
Querys to see how many potentiometers this Potentiometer 1-Wire Device has.
| state | state buffer of the Potentiometer 1-Wire Device (returned by readDevice() ) |
Implemented in OneWireContainer2C.
| int numberOfWiperSettings | ( | byte[] | state | ) |
Querys to find the number of wiper settings that any wiper on this Potentiometer 1-Wire Device can have.
| state | state buffer of the Potentiometer 1-Wire Device (returned by readDevice() ) |
Implemented in OneWireContainer2C.
| int potentiometerResistance | ( | byte[] | state | ) |
Querys to find the resistance value of the potentiometer.
| state | state buffer of the Potentiometer 1-Wire Device (returned by readDevice() ) |
Implemented in OneWireContainer2C.
| void setChargePump | ( | boolean | charge_pump_on, |
| byte[] | state | ||
| ) |
Sets the state of the Potentiometer's charge pump.
This decreases the wiper's resistance, but increases the power consumption by the part. Vdd must be connected to use the charge pump.
| charge_pump_on | true to enable the charge pump, false to disable charge pump |
| state | state buffer of the Potentiometer 1-Wire Device (returned by readDevice() ) |
true
if the operation was successful, false
if there was an error Implemented in OneWireContainer2C.
| void setCurrentWiperNumber | ( | int | wiper_number, |
| byte[] | state | ||
| ) |
Sets the currently selected wiper number.
All wiper actions will then affect this wiper. The number of wipers is the same as numberOfPotentiometers()
.
| wiper_number | wiper number to select for communication |
| state | state buffer of the Potentiometer 1-Wire Device (returned by readDevice() ) |
Implemented in OneWireContainer2C.
| boolean setWiperPosition | ( | int | position | ) | throws OneWireIOException, OneWireException |
Sets the wiper position of the potentiometer.
| position | position to set the wiper to |
true
if the operation was successful, false
otherwise| com.dalsemi.onewire.adapter.OneWireIOException | Data was not written correctly |
| com.dalsemi.onewire.OneWireException | Could not find device |
Implemented in OneWireContainer2C.
| boolean wiperSettingsAreVolatile | ( | byte[] | state | ) |
Querys to see if this Potentiometer 1-Wire Device's wiper settings are volatile or non-volatile.
| state | state buffer of the Potentiometer 1-Wire Device (returned by readDevice() ) |
true
if the wiper settings are volatile, false
if the wiper settings are non-volatile. Implemented in OneWireContainer2C.


This will clear the diagram, save your work before proceeding.
Select a JSON file:
Select an SVG file:
Entity Nodes: Comes in various shapes and types. Use the info panel to edit certain attributes of a selected node. To check the type, right click an entity.
Environment Entity Node: The dashed environment entity denotes the region of adjacent parts of the system and acts as the root in the editor. To properly generate the algebraic expression, every entity must be placed inside the environment node. Unlinkable with other entities.
Atomic Entity Node: The standard entity type.
Non-Atomic Entity Node: Acts as a group node which allows entities to be nested for a hierarchial representation of bigraphs.
ID Entity Node: The identity node, which is represented as a dashed grey box by default, acts as a placeholder for other bigraphs. Unlinkable with other entities.
Name: Represents the links to other external bigraphs. To use it, simply place the name outside the environment node and create a connection with an entity node. The name must match the link name.
Custom Entity Nodes: Custom nodes could be used by importing an SVG file from the "Add Custom SVG" menu. The user could specify the type of entity as either atomic or non-atomic. The fill option is not available.
Links: To form a link between other entities, click the region within the node and drag the highlighted arrow to another entity. Link names could be configured inside the info panel.
Dragging: To move entity nodes, click and drag the highlighted box on the top left corner.
Renaming: To change the name of the bigraph, change the value within the textbox on the left of the menubar.


CSE 167 Final Project
Blog Post #4
Description of Work Completed: I finished the shadow mapping and added a textured floor.
Final render:
Blog Post #3
Updates to Original Plan: I decided not to program collision detection with bounding spheres or boxes.
Description of Work Completed: I completed the following during the last week:
(i) Added background environment sound
(ii) Added shadow mapping (still some kinks to iron out)
(iii) Added Phong illumination with both point and directional lights
(iv) Imported new 3D models of musical instruments and a Victorian house
Desert scene:
Inside the house:
Shadow cast on inside of house:
Blog Post #2
Updates to Original Plan: In order to focus more attention on the game play aspects of "Desert Sounds", I made the
following modifications to my original plan:
(i) import 3D models of trees rather than procedurally generate them using L-systems
(ii) add first-person camera control with player movements
Description of Work Completed: I completed the following during the last week:
(i) Created desert skybox
(ii) Imported 3D models of trees, house, and musical instruments
Desert scene:
Close-up of the house (notice the violin and the guitar in the front yard):
Blog Post #1
Title of project: "Desert Sounds"
Name: Chad McKell
Description: "Desert Sounds" is a desert environment with a world of sounds to discover—a babbling brook, a pond with
crickets, and a concrete house with musical instruments. When the application opens, the player will be placed about 100 meters away from the house.
The player may then choose to walk to the brook, the pond, or the house. Musical instruments will be placed inside the house as well
as on the porch outside in order to demonstrate that the acoustics vary by location.
Technical Features:
1. Easy:
(i) Collision detection with bounding spheres or boxes
(ii) Sound effects
2. Medium:
(i) Procedurally generated plants with L-systems
(ii) Shadow mapping
Creative efforts: First, I will collect a number of audio files to match various scenes in my environment. Then, I
will use a convolution reverberation algorithm to simulate realistic room acoustics in the concrete house.
Out in the desert:
Inside the concrete house, we find musical instruments (e.g. a cymbal):


Financial insecurity is the No. 1 reason survivors of domestic violence remain in or return to abuse. In order to break the cycle of violence, we must remove obstacles to financial security for survivors. This interactive calculator will help those not experiencing violence to understand how much it would cost for them to leave their lives.
The calculator includes a personal monthly budget to determine what costs you would need to cover, and a way to calculate the costs of relocating.The monthly personal budget allows you to enter any ongoing costs you might have while trying to relocate. After entering all relevant fields, a page will combine your total monthly expenses plus the cost of relocation.
If this calculator leads you to give back, we would love to partner with you in helping provide safety and financial stability for survivors of domestic violence. You can donate at our website.
If you or someone you know is experiencing domestic violence, there are anonymous advocacy groups that can help. You can contact the National Domestic Violence Hotline at www.thehotline.org or call at 1-800-799-SAFE (7233).


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T
- Class of Requestpublic abstract class AsyncDominoJNX<T> extends java.lang.Object implements AsyncDominoBase<T>, io.reactivex.ObservableOnSubscribe<T>
Interaction with the Domino backend to execute requests based on DominoJNX
AsyncDominoBase.RequestType
| Modifier and Type | Field and Description |
|---|---|
protected java.lang.String |
apiName |
protected java.util.List<io.micrometer.core.instrument.Tag> |
appTags |
protected static org.slf4j.Logger |
logger |
protected io.vertx.core.json.JsonObject |
requestParams |
static java.lang.String |
UNNEEDED_CALL |
protected KeepUser |
user |
protected io.vertx.core.Vertx |
vertx |
| Modifier | Constructor and Description |
|---|---|
protected |
AsyncDominoJNX()
Default constructor for easy object creation
|
| Modifier and Type | Method and Description |
|---|---|
void |
accessControlCheck(KeepJnxSession session,
com.hcl.domino.data.Database db)
Checks if the current user has the required access to perform the operation on a given database
|
protected void |
dontCallProcessPayload() |
protected io.reactivex.Observer<T> |
emitterToObserver(io.reactivex.ObservableEmitter<T> oe) |
protected io.vertx.core.Future<java.lang.String> |
getActualDatabaseName(KeepUser actualUser,
io.vertx.core.json.JsonObject payloadData) |
java.lang.String |
getApiName() |
java.util.List<io.micrometer.core.instrument.Tag> |
getAppTags() |
TheBarbican |
getBarbican() |
java.lang.String |
getEventbusId() |
protected KeepDbInfo |
getKeepDbInfo() |
AsyncDominoBase.RequestType |
getRequestType() |
protected io.reactivex.ObservableEmitter<T> |
getSubscriber() |
KeepUser |
getUser() |
protected java.lang.String |
getUserForMetrics() |
boolean |
isProcessPayloadRequired()
Check if we need to execute processPayload or everything was done in preflight asynchronously
|
boolean |
isWorkInProgress()
Is the implementation of the (sub)class still work in progress? Needs to be overwritten by subclasses
|
protected void |
processDominoRequest(io.vertx.core.eventbus.Message<io.vertx.core.json.JsonObject> incoming)
The processDominoRequest method provides the EventBusResponseSubscriber that listens to the result of the database operation.
|
protected void |
recordAppMetrics(java.lang.String appId)
Records the use of this API for an application
|
void |
setApiName(java.lang.String apiName)
Sets the OperationId / APIName the implementing class is reacting to typically matched the class name
|
void |
setBarbican(TheBarbican barbican)
Setter for TheBarbican, allowing a mock TheBarbican to be used in tests
|
void |
setDbFileName(java.lang.String dbFileName)
Overwrite the physical file name for the database to act on.
|
void |
setKeepDbInfo(KeepDbInfo keepDbInfo)
Provides the database information like path and configured forms to the method.
|
void |
setProcessPayloadRequired(boolean processPayloadRequired)
When set to false no code in process incoming is executed usually added when everything is done async in preflight
|
void |
setRequestParams(io.vertx.core.json.JsonObject source)
Updates the parameter object coming in from the request
|
AsyncDominoBase<T> |
setRequestType(AsyncDominoBase.RequestType requestType) |
void |
setSubscriber(io.reactivex.ObservableEmitter<T> subscriber)
Sets the subscriber receiving the events that the class generates from interacting with the database.
|
void |
setUser(KeepUser user)
Overwrite the user to act upon.
|
void |
setVertx(io.vertx.core.Vertx vertx)
Inject the runtime into the request
|
void |
subscribe(io.reactivex.ObservableEmitter<T> newSubscriber)
Execution of the request inside a vert.x execute Blocking to ensure we don’t block the event loop Loads user and apiName (?db= query string param) from the observer
|
protected void |
validateDqlAccess(KeepJnxSession s,
com.hcl.domino.data.Database db)
Validate the user has access to run DQL, according to the DQL access formula in the KeepConfig
|
protected void |
validateOpenAccess() |
protected boolean |
validationCheck(boolean status,
java.lang.String message,
java.lang.Object... params)
Helper class to log failures to local onError method of subscriber used in custom validator
|
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
customValidator, getDbRequestParameters, preflight, process
public static final java.lang.String UNNEEDED_CALL
protected static final org.slf4j.Logger logger
protected io.vertx.core.json.JsonObject requestParams
protected io.vertx.core.Vertx vertx
protected final java.util.List<io.micrometer.core.instrument.Tag> appTags
protected KeepUser user
protected java.lang.String apiName
protected AsyncDominoJNX()
Default constructor for easy object creation
public boolean isWorkInProgress()
Is the implementation of the (sub)class still work in progress? Needs to be overwritten by subclasses
public void accessControlCheck(KeepJnxSession session, com.hcl.domino.data.Database db) throws KeepException
Checks if the current user has the required access to perform the operation on a given database
session
- Keep Sessiondb
- Domino databaseKeepException
public java.lang.String getApiName()
getApiName
in interface AsyncDominoBase<T>
getApiName
in interface KeepSubscriberInfo
public java.util.List<io.micrometer.core.instrument.Tag> getAppTags()
getAppTags
in interface AsyncDominoBase<T>
public TheBarbican getBarbican()
getBarbican
in interface AsyncDominoBase<T>
public java.lang.String getEventbusId()
public AsyncDominoBase.RequestType getRequestType()
getRequestType
in interface AsyncDominoBase<T>
public KeepUser getUser()
getUser
in interface AsyncDominoBase<T>
getUser
in interface KeepSubscriberInfo
public boolean isProcessPayloadRequired()
Check if we need to execute processPayload or everything was done in preflight asynchronously
isProcessPayloadRequired
in interface AsyncDominoBase<T>
public void setApiName(java.lang.String apiName)
AsyncDominoBase
Sets the OperationId / APIName the implementing class is reacting to typically matched the class name
setApiName
in interface AsyncDominoBase<T>
apiName
- the apiName to setpublic void setBarbican(TheBarbican barbican)
Setter for TheBarbican, allowing a mock TheBarbican to be used in tests
barbican
- public void setDbFileName(java.lang.String dbFileName)
AsyncDominoBase
Overwrite the physical file name for the database to act on. Used in mail and testing scenarios
setDbFileName
in interface AsyncDominoBase<T>
dbFileName
- the dbFileName to setpublic void setKeepDbInfo(KeepDbInfo keepDbInfo)
AsyncDominoBase
Provides the database information like path and configured forms to the method. Important for subrequest handling
setKeepDbInfo
in interface AsyncDominoBase<T>
keepDbInfo
- KeepDbInfo object for the database to be queriedpublic void setProcessPayloadRequired(boolean processPayloadRequired)
When set to false no code in process incoming is executed usually added when everything is done async in preflight
setProcessPayloadRequired
in interface AsyncDominoBase<T>
processPayloadRequired
- the processPayloadRequired to setpublic void setRequestParams(io.vertx.core.json.JsonObject source)
AsyncDominoBase
Updates the parameter object coming in from the request
setRequestParams
in interface AsyncDominoBase<T>
public AsyncDominoBase<T> setRequestType(AsyncDominoBase.RequestType requestType)
setRequestType
in interface AsyncDominoBase<T>
requestType
- used for metricspublic void setSubscriber(io.reactivex.ObservableEmitter<T> subscriber)
AsyncDominoBase
Sets the subscriber receiving the events that the class generates from interacting with the database. Could be and EventbusResponseSubscriber or a SubTask or a KeepTestSubscriber
setSubscriber
in interface AsyncDominoBase<T>
subscriber
- the subscriber to setpublic void setUser(KeepUser user)
AsyncDominoBase
Overwrite the user to act upon. Used in delegation scenarios or for test environments (doesn’t bypass security)
setUser
in interface AsyncDominoBase<T>
user
- the user to setpublic void setVertx(io.vertx.core.Vertx vertx)
AsyncDominoBase
Inject the runtime into the request
setVertx
in interface AsyncDominoBase<T>
vertx
- public void subscribe(io.reactivex.ObservableEmitter<T> newSubscriber)
Execution of the request inside a vert.x execute Blocking to ensure we don’t block the event loop Loads user and apiName (?db= query string param) from the observer
subscribe
in interface io.reactivex.ObservableOnSubscribe<T>
protected void dontCallProcessPayload() throws KeepExceptionServer
KeepExceptionServer
protected io.reactivex.Observer<T> emitterToObserver(io.reactivex.ObservableEmitter<T> oe)
oe
- Observable emitterprotected io.vertx.core.Future<java.lang.String> getActualDatabaseName(KeepUser actualUser, io.vertx.core.json.JsonObject payloadData)
protected KeepDbInfo getKeepDbInfo()
protected io.reactivex.ObservableEmitter<T> getSubscriber()
protected java.lang.String getUserForMetrics()
protected void processDominoRequest(@Nonnull io.vertx.core.eventbus.Message<io.vertx.core.json.JsonObject> incoming)
The processDominoRequest method provides the EventBusResponseSubscriber that listens to the result of the database operation. Most operations return JSON, but some (Attachments, MIME content) use Buffers. This default method uses JSON responses, overwrite this method in your extension to AsyncDominoJNX with an EventBusResponseSubscriber expecting your data type
incoming
- protected void recordAppMetrics(java.lang.String appId)
Records the use of this API for an application
appId
- protected void validateDqlAccess(KeepJnxSession s, com.hcl.domino.data.Database db) throws KeepException
Validate the user has access to run DQL, according to the DQL access formula in the KeepConfig
s
- db
- KeepException
- error, e.g. not enough access or failure parsing formulaprotected void validateOpenAccess() throws KeepExceptionOpenAccessBlocked
KeepExceptionOpenAccessBlocked
protected boolean validationCheck(boolean status, java.lang.String message, java.lang.Object... params)
Helper class to log failures to local onError method of subscriber used in custom validator
status
- condition if false triggers onErrormessage
- the error messageparams
- Parameters to format the message


This test checks that on a long press or a two finger tap gesture in a text area, the cursor is first set to the right position (this is done by sending a right mouse button down event just before long press).