ThreadPoolExecutor in Android

!!readme.md

ThreadPoolExecutor

ThreadPoolExecutor executes parallelized tasks across multiple different threads of a thread pool. To execute work concurrently and retain control over how the work is executed, this is the tool for the job.

Using ThreadPoolExecutor

1. constructing a new instance
2. confgure the many arguments of the thread pool
3. if initializing ThreadPoolExecutor in a service, ensure to create it within onStartCommand() not onCreate()
4. execute runnables on the ThreadPoolExecutor.
5. shut it down when you are done a. executor.shutdownNow() b. executor.shutdown()

01_ThreadPoolExecutor.java

// Determine the number of cores on the device
int NUMBER_OF_CORES = Runtime.getRuntime().availableProcessors();
// Construct thread pool passing in configuration options
// int minPoolSize, int maxPoolSize, long keepAliveTime, TimeUnit unit,
// BlockingQueue<Runnable> workQueue
ThreadPoolExecutor executor = new ThreadPoolExecutor(
    NUMBER_OF_CORES*2,
    NUMBER_OF_CORES*2,
    60L,
    TimeUnit.SECONDS,
    new LinkedBlockingQueue<Runnable>()
);

02_Execute.java

// Executes a task on a thread in the thread pool
executor.execute(new Runnable() {
    public void run() {
        // Do some long running operation in background
        // on a worker thread in the thread pool!
    }
});

03_shutdown.java

executor.shutdown();