org.mule.util.queue
Class AbstractQueueStoreDelegate

java.lang.Object
  org.mule.util.queue.AbstractQueueStoreDelegate

All Implemented Interfaces:

QueueStoreDelegate

Direct Known Subclasses:

DefaultQueueStoreDelegate, DualRandomAccessFileQueueStoreDelegate

public abstract class AbstractQueueStoreDelegate
extends Object
implements QueueStoreDelegate

Abstract queue delegate implementation that forces common queue behaviour

Constructor Summary

AbstractQueueStoreDelegate(int capacity)

Method Summary

protected abstract void	add(Serializable item) Adds an item at the end of the queue
boolean	addAll(Collection<? extends Serializable> items) Appends all of the elements in the specified collection to the queue (optional operation).
protected abstract void	addFirst(Serializable item) Adds an object at the beginning of the queue
void	clear() Discards all the elements in the queue
protected abstract boolean	doAddAll(Collection<? extends Serializable> items) Adds all the items at the end of the queue
protected abstract void	doClear() Removes all the items in the queue
protected abstract Serializable	getFirst() reads the first element in the queue
int	getSize() Return the size of the queue
protected abstract boolean	isEmpty()
boolean	offer(Serializable o, int room, long timeout) Offer to append a new member to the end of the queue
Serializable	peek() return, but do not remove, the first member of the queue
Serializable	poll(long timeout) Poll the queue for its first member, and, if there is one, remove and return it
void	putNow(Serializable o) append a new member to the end of the queue
protected abstract Serializable	removeFirst() removes the first element in the queue
protected abstract int	size()
void	untake(Serializable item) Restore a previously removed member to the front of the queue

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.mule.util.queue.QueueStoreDelegate

dispose

Constructor Detail

AbstractQueueStoreDelegate

public AbstractQueueStoreDelegate(int capacity)

Method Detail

putNow

public final void putNow(Serializable o)

Description copied from interface: QueueStoreDelegate

append a new member to the end of the queue

Specified by:

putNow in interface QueueStoreDelegate

offer

public final boolean offer(Serializable o,
                           int room,
                           long timeout)
                    throws InterruptedException

Description copied from interface: QueueStoreDelegate

Offer to append a new member to the end of the queue

Specified by:

offer in interface QueueStoreDelegate

Throws:

InterruptedException

poll

public final Serializable poll(long timeout)
                        throws InterruptedException

Description copied from interface: QueueStoreDelegate

Poll the queue for its first member, and, if there is one, remove and return it

Specified by:

poll in interface QueueStoreDelegate

Throws:

InterruptedException

peek

public final Serializable peek()
                        throws InterruptedException

Description copied from interface: QueueStoreDelegate

return, but do not remove, the first member of the queue

Specified by:

peek in interface QueueStoreDelegate

Throws:

InterruptedException

untake

public final void untake(Serializable item)
                  throws InterruptedException

Description copied from interface: QueueStoreDelegate

Restore a previously removed member to the front of the queue

Specified by:

untake in interface QueueStoreDelegate

Throws:

InterruptedException

clear

public final void clear()
                 throws InterruptedException

Description copied from interface: QueueStoreDelegate

Discards all the elements in the queue

Specified by:

clear in interface QueueStoreDelegate

Throws:

InterruptedException

addAll

public final boolean addAll(Collection<? extends Serializable> items)

Description copied from interface: QueueStoreDelegate

Appends all of the elements in the specified collection to the queue (optional operation).

Specified by:

addAll in interface QueueStoreDelegate

Parameters:

items - to be added to the queue

Returns:

true if this queue changed as a result of the call

getSize

public int getSize()

Description copied from interface: QueueStoreDelegate

Return the size of the queue

Specified by:

getSize in interface QueueStoreDelegate

size

protected abstract int size()

Returns:

the number of elements in the queue

getFirst

protected abstract Serializable getFirst()
                                  throws InterruptedException

reads the first element in the queue

Returns:

the fist element in the queue

Throws:

InterruptedException

removeFirst

protected abstract Serializable removeFirst()
                                     throws InterruptedException

removes the first element in the queue

Returns:

the first element in the queue

Throws:

InterruptedException

add

protected abstract void add(Serializable item)

Adds an item at the end of the queue

Parameters:

item - object to add

addFirst

protected abstract void addFirst(Serializable item)
                          throws InterruptedException

Adds an object at the beginning of the queue

Parameters:

item - object to add

Throws:

InterruptedException

doAddAll

protected abstract boolean doAddAll(Collection<? extends Serializable> items)

Adds all the items at the end of the queue

Parameters:

items - objects to add

Returns:

true if it were able to add them all, false otherwise

doClear

protected abstract void doClear()

Removes all the items in the queue

isEmpty

protected abstract boolean isEmpty()

Returns:

true if the queue is empty, false otherwise