IExecutor Interface

An object that executes submitted Java.Lang.IRunnable tasks.

Syntax

[Android.Runtime.Register("java/util/concurrent/Executor", "", "Java.Util.Concurrent.IExecutorInvoker")]
public interface IExecutor : Android.Runtime.IJavaObject, IDisposable

Remarks

An object that executes submitted Java.Lang.IRunnable tasks. This interface provides a way of decoupling task submission from the mechanics of how each task will be run, including details of thread use, scheduling, etc. An Executor is normally used instead of explicitly creating threads. For example, rather than invoking new Thread(new(RunnableTask())).start() for each of a set of tasks, you might use:

java Example

 Executor executor = anExecutor;
 executor.execute(new RunnableTask1());
 executor.execute(new RunnableTask2());
 ...

However, the Executor interface does not strictly require that execution be asynchronous. In the simplest case, an executor can run the submitted task immediately in the caller's thread:

java Example

class DirectExecutor implements Executor {
   public void execute(Runnable r) {
     r.run();
   
 }}

More typically, tasks are executed in some thread other than the caller's thread. The executor below spawns a new thread for each task.

java Example

class ThreadPerTaskExecutor implements Executor {
   public void execute(Runnable r) {
     new Thread(r).start();
   
 }}

Many Executor implementations impose some sort of limitation on how and when tasks are scheduled. The executor below serializes the submission of tasks to a second executor, illustrating a composite executor.

java Example

class SerialExecutor implements Executor {
   final Queue tasks = new ArrayDeque();
   final Executor executor;
   Runnable active;

   SerialExecutor(Executor executor) {
     this.executor = executor;
   

   public synchronized void execute(final Runnable r) {
     tasks.offer(new Runnable() {
       public void run() {
         try {
           r.run();
         } finally {
           scheduleNext();
         }
       }
     });
     if (active == null) {
       scheduleNext();
     }
   }

   protected synchronized void scheduleNext() {
     if ((active = tasks.poll()) != null) {
       executor.execute(active);
     }
   }
 }}

The Executor implementations provided in this package implement Java.Util.Concurrent.IExecutorService, which is a more extensive interface. The Java.Util.Concurrent.ThreadPoolExecutor class provides an extensible thread pool implementation. The Java.Util.Concurrent.Executors class provides convenient factory methods for these Executors.

Memory consistency effects: Actions in a thread prior to submitting a Runnable object to an Executor its execution begins, perhaps in another thread.

[Android Documentation]

Requirements

Namespace: Java.Util.Concurrent
Assembly: Mono.Android (in Mono.Android.dll)
Assembly Versions: 0.0.0.0
Since: Added in API level 1