org.opennms.netmgt.scheduler

Class LegacyScheduler.PeekableFifoQueue<T>

java.lang.Object

org.opennms.core.queue.FifoQueueImpl<T>

org.opennms.netmgt.scheduler.LegacyScheduler.PeekableFifoQueue<T>

All Implemented Interfaces:

FifoQueue<T>

Enclosing class:

LegacyScheduler

public static final class LegacyScheduler.PeekableFifoQueue<T>
extends FifoQueueImpl<T>

This queue extends the standard FIFO queue instance so that it is possible to peek at an instance without removing it from the queue.

Field Summary

Fields inherited from class org.opennms.core.queue.FifoQueueImpl

m_delegate

Constructor Summary

Constructors

Constructor and Description
PeekableFifoQueue()

Method Summary

Modifier and Type	Method and Description
T	peek() This method allows the caller to peek at the next object that would be returned on a remove call.

Methods inherited from class org.opennms.core.queue.FifoQueueImpl

add, add, isEmpty, remove, remove, size

Methods inherited from class java.lang.Object

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

Constructor Detail

PeekableFifoQueue

public PeekableFifoQueue()

Method Detail

peek

public T peek()
       throws InterruptedException

This method allows the caller to peek at the next object that would be returned on a remove call. If the queue is currently empty then the caller is blocked until an object is put into the queue.

Returns:

The object that would be returned on the next call to remove.

Throws:

InterruptedException - Thrown if the thread is interrupted.

FifoQueueException - Thrown if an error occurs removing an item from the queue.