org.opennms.core.queue
Interface NotifiableInputFifoQueue<T>

All Superinterfaces:

FifoQueue<T>

public interface NotifiableInputFifoQueue<T>
extends FifoQueue<T>

This interface is implemented by FIFO queue implementations that can notify interested listener when elements are added to the queue. This is useful for listeners that may block or preform other work while a queue is empty, instead of using polling.

Author:

Brian Weaver

Method Summary

void	addInputListener(InputFifoQueueListener<T> listener) Adds a new listener to the notifiable queue.
void	removeInputListener(InputFifoQueueListener<T> listener) Removes an already registered listener.

Methods inherited from interface org.opennms.core.queue.FifoQueue

add, add, isEmpty, remove, remove, size

Method Detail

addInputListener

void addInputListener(InputFifoQueueListener<T> listener)

Adds a new listener to the notifiable queue. If the listener already exists then it is up to the implementor to determine behavior. When a new element is added to the queue the listener will have its callbackmethod invoked.

Parameters:

listener - The instance to be notified on queue additions.

removeInputListener

void removeInputListener(InputFifoQueueListener<T> listener)

Removes an already registered listener. If the listener was not already registered then no action is performed.

Parameters:

listener - The listener to remove from the queue.