edu.rice.cs.plt.lambda
Class LazyRunnable

java.lang.Object
  edu.rice.cs.plt.lambda.LazyRunnable

All Implemented Interfaces:

Runnable

public class LazyRunnable
extends Object
implements Runnable

A block of code that executes at most once. The first invocation of run() runs the code; subsequent invocations are no-ops. (If an exception occurs during evaluation, the nested runnable will be evaluated again on a subsequent invocation.)

Evaluation is thread-safe: locking guarantees that the nested code will never be run (and terminate normally) twice. Thus, if two threads invoke run() for the first time simultaneously, one will block until the other completes, and then act as a no-op.

See Also:

LazyThunk

Constructor Summary

LazyRunnable(Runnable block)

Method Summary

void

run()

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

LazyRunnable

public LazyRunnable(Runnable block)

Method Detail

run

public void run()

Specified by:

run in interface Runnable