Class Monitor.Guard

java.lang.Object

com.google.common.util.concurrent.Monitor.Guard

Enclosing class:

Monitor

public abstract static class Monitor.Guard
extends Object

A boolean condition for which a thread may wait. A Guard is associated with a single Monitor. The monitor may check the guard at arbitrary times from any thread occupying the monitor, so code should not be written to rely on how often a guard might or might not be checked.

If a Guard is passed into any method of a Monitor other than the one it is associated with, an IllegalMonitorStateException is thrown.

Since:

10.0

Author:

Justin T. Sampson, Martin Buchholz

Constructor Summary

Constructors

Modifier	Constructor	Description
protected	Guard(Monitor monitor)

Method Summary

Modifier and Type	Method	Description
abstract boolean	isSatisfied()	Evaluates this guard's boolean condition.

Methods inherited from class java.lang.Object

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

Constructor Details

Guard

protected Guard(Monitor monitor)

Method Details

isSatisfied

public abstract boolean isSatisfied()

Evaluates this guard's boolean condition. This method is always called with the associated monitor already occupied. Implementations of this method must depend only on state protected by the associated monitor, and must not modify that state.