com.programix.thread
Class Waiter.Expression

java.lang.Object
  com.programix.thread.Waiter.Expression

Enclosing class:

Waiter

public abstract static class Waiter.Expression
extends Object

Used to provide Waiter.Condition with a boolean expression to evaluate by subclassing and implementing the isTrue() method. An Expression is passed into the createCondition method of Waiter.

When these two methods are called from Waiter and Waiter.Condition, the calling thread will be holding a lock on the object specified as a parameter to the constructor for WaitFor.

Author:

Paul Hyde

Constructor Summary

Waiter.Expression()

Method Summary

boolean	isFalse() Returns true when the expression currently evaluates to be false.
abstract boolean	isTrue() Returns true when the expression currently evaluates to be, well, true.

Methods inherited from class java.lang.Object

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

Constructor Detail

Waiter.Expression

public Waiter.Expression()

Method Detail

isTrue

public abstract boolean isTrue()

Returns true when the expression currently evaluates to be, well, true. Implemented by subclasses.

isFalse

public boolean isFalse()

Returns true when the expression currently evaluates to be false. The implementation on this class simply does:

 return !isTrue();
 

Feel free to override it if you have a more efficient way of determining that it is false.