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README.md

ThreadingTools

Java useful tools for managing threads like a master βš‘πŸ‘ŠπŸ› 

1. Introduction and purposes

ThreadsPooling

ThreadsPooling provides a fast, easy access to a pool of threads that concurrently must be running, with upper limits.

It accepts all types of Runnable classes:

  • Thread.
  • NotifyingThread.
  • Any class that implements Runnable.

ThreadsPooling aims to be as helpful as possible for the developer: with some simple methods, anyone can create a new ThreadsPooling object with all the values set-up to their defaults:

  • Concurrent running process: its default value is 4.
  • Maximum running process: its default value is 8.
  • Default keep alive time: its default is 100 ms.
  • Default queue capacity: its default is 100 items.

For more information, please read the official documentation.

NotifyingThread

NotifyingThread provides an specialised class on threading that adds more options to the currently available ones:

  • Notifying: sometimes, we want to get notified when a Thread completes its execution, but actually the most we can do is just call join() and wait until its completion, making us unable to do other works.
    NotifyingThread provides a fast, powerful class for getting notified when, the threads we want, finish. The only requirement is to subscribe our class to the listener classes, just by implementing OnThreadCompletedListener.

  • Fast development: is very useful to create nested classes inside a thread by declaring:

    new Thread(new Runnable() {
        // ALL THE CODE TO BE EXECUTED
    }).start();

    Using the powerful lambda expressions, doing this with the code is not more necessary. For example:

    public class MyClass implements OnThreadCompletedLisener {  
      private int myField;
      
      /* --- CONSTRUCTORS,ETC. --- */
    
      public void heavyOperationThatUsesLotsOfResources() {
          // The big operation - imagine that uses myField value
          // This operation also takes about 5 minutes to complete,
          // so we do not want to wait all that time.  
      }
    
      public void caller() {
          NotifyingThread thread = new NotifyingThread(this);
          // "this" refers itself for the "OnCompletedListener"
          thread.setExecutable(this::heavyOperationThatUsesLotsOfResources);
          // by using that expression, we do not need to write again
          // the hole function.
          thread.start();
      }
    
      public void onThreadCompletedListener(final Thread thread, Throwable exception) {
          // Handle thread finish
          if (exception != null)
              System.out.println("Thread " + thread.getName() + " finished!");
          else 
              System.err.println("Thread " + thread.getName() + " finished with an exception");
      }
    }

    As you can see, we declared and used the function inside our class only with one line, by using a lambda expression.

  • Adaptive: by using the ArgumentParser and the overloaded methods of setExecutable, NotfyingThread adapts to each function you need to use at every moment.

For more information, please read the official documentation.

ArgumentParser

ArgumentParser provides a fully compatible class with plenty of objects. It is designed for using it as an access platform to methods' arguments and params, taking advantage of lambda expressions of Java 8 and above.

It is not thread safe as all the operations are not done atomically, so there is no guarantee that all the data stored at HashMap is saved in the order expected and with the expected values if appending from multiple threads at the same time.

It is based on ContentValues, used in Android, with some customizations and new tools.

For more information, please read the official documentation.

2. Installation

For using this library at any Java application you are using, you can just download from "Releases" or use one of the following methods:

Maven

First add JCenter to your app:

<repositories>
    <repository>
      <id>jcenter</id>
      <url>https://jcenter.bintray.com/</url>
    </repository>
</repositories>

Then, you can just include the lib:

<dependency>
  <groupId>com.github.javinator9889</groupId>
  <artifactId>threadingtools</artifactId>
  <version>1.0</version>
  <type>pom</type>
</dependency>

Gradle

First, add JCenter to your app:

repositories {
    jcenter()
    // Other repositories you have
}

Then, you can just include the lib:

implementation 'com.github.javinator9889:threadingtools:1.0'

Ivy

First, add JCenter to your Ivy settings:

<ivysettings>
    <resolvers>
        <ibiblio name="bintray"
                 m2compatible="true"
                 root="http://dl.bintray.com/content/example/external-deps"/>
    </resolvers>
</ivysettings>

Then, you can just include the lib:

<dependency org='com.github.javinator9889' name='threadingtools' rev='1.0'>
  <artifact name='threadingtools' ext='pom' ></artifact>
</dependency>

You must have to include JCenter() in order to make it work.

3. Usage

After successfully included the library in your project, you must do the following for using this class:

  • Generate a new ThreadsPooling if you are going to use them.
  • Setup the NotifyingThreads, and include them inside the ThreadsPooling.
  • Call ThreadsPooling.start() method for start executing the threads.

You can see some examples at the examples folder, in which all those process and lambda usage are specified.

If you need more information, read the docs in which you will find every method detailed and explained.

4. Contributing

If you find any error or you want to add a new feature, you can perfectly:

  1. Open a new issue completing the issue template so it will be easier to solve it.

  2. Create a new pull request with the changes you have made to the project, and waiting my approval for merging them.

  3. Give me a star ⚑⭐ if you found this library useful πŸ˜„

5. License

 Copyright Β© 2018 - present | Javinator9889

 This program is free software: you can redistribute it and/or modify
 it under the terms of the GNU General Public License as published by
 the Free Software Foundation, either version 3 of the License, or
 (at your option) any later version.

 This program is distributed in the hope that it will be useful,
 but WITHOUT ANY WARRANTY; without even the implied warranty of
 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 GNU General Public License for more details.

 You should have received a copy of the GNU General Public License
 along with this program.  If not, see https://www.gnu.org/licenses/.
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