org.mule.util.queue
Class DualRandomAccessFileQueueStoreDelegate

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

All Implemented Interfaces:

QueueStoreDelegate, TransactionalQueueStoreDelegate

public class DualRandomAccessFileQueueStoreDelegate
extends AbstractQueueStoreDelegate
implements TransactionalQueueStoreDelegate

TransactionalQueueStoreDelegate implementation using two files for storing the queue data. Entries are stored in the queue file until a certain size in the file. After that size is reached a new file is created and used to store new entries until the previous file queue entries are consumed, in which case the file is cleaned and reused for new entries once the second files gets full.

Field Summary

protected org.apache.commons.logging.Log	logger
static int	ONE_MEGABYTE

Constructor Summary

DualRandomAccessFileQueueStoreDelegate(String queueName, String workingDirectory, MuleContext muleContext, int capacity)

Method Summary

protected void	add(Serializable item) Adds an item at the end of the queue
protected void	addFirst(Serializable item) Adds an object at the beginning of the queue
Collection<Serializable>	allElements()
void	close() Releases all resources managed by this queue without removing the queue data.
boolean	contains(Serializable value) checks if the given value exists in the queue Used only during recovery phase which means this method does not require great performance
void	dispose() Deletes the queue and it's content.
protected boolean	doAddAll(Collection<? extends Serializable> items) Adds all the items at the end of the queue
void	doClear() Removes all the items in the queue
protected Serializable	getFirst() reads the first element in the queue
static File	getFirstQueueFile(String queueName, String workingDirectory)
static File	getSecondQueueFile(String queueName, String workingDirectory)
protected boolean	isEmpty()
void	remove(Serializable value) Remove the specified value from the queue.
protected Serializable	removeFirst() removes the first element in the queue
int	size()

Methods inherited from class org.mule.util.queue.AbstractQueueStoreDelegate

addAll, clear, getSize, offer, peek, poll, putNow, untake

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

addAll, clear, getSize, offer, peek, poll, putNow, untake

Field Detail

ONE_MEGABYTE

public static final int ONE_MEGABYTE

See Also:

Constant Field Values

logger

protected final org.apache.commons.logging.Log logger

Constructor Detail

DualRandomAccessFileQueueStoreDelegate

public DualRandomAccessFileQueueStoreDelegate(String queueName,
                                              String workingDirectory,
                                              MuleContext muleContext,
                                              int capacity)

Method Detail

getFirstQueueFile

public static File getFirstQueueFile(String queueName,
                                     String workingDirectory)

getSecondQueueFile

public static File getSecondQueueFile(String queueName,
                                      String workingDirectory)

addFirst

protected void addFirst(Serializable item)
                 throws InterruptedException

Description copied from class: AbstractQueueStoreDelegate

Adds an object at the beginning of the queue

Specified by:

addFirst in class AbstractQueueStoreDelegate

Parameters:

item - object to add

Throws:

InterruptedException

add

protected void add(Serializable item)

Description copied from class: AbstractQueueStoreDelegate

Adds an item at the end of the queue

Specified by:

add in class AbstractQueueStoreDelegate

Parameters:

item - object to add

removeFirst

protected Serializable removeFirst()
                            throws InterruptedException

Description copied from class: AbstractQueueStoreDelegate

removes the first element in the queue

Specified by:

removeFirst in class AbstractQueueStoreDelegate

Returns:

the first element in the queue

Throws:

InterruptedException

getFirst

protected Serializable getFirst()
                         throws InterruptedException

Description copied from class: AbstractQueueStoreDelegate

reads the first element in the queue

Specified by:

getFirst in class AbstractQueueStoreDelegate

Returns:

the fist element in the queue

Throws:

InterruptedException

size

public int size()

Specified by:

size in class AbstractQueueStoreDelegate

Returns:

the number of elements in the queue

isEmpty

protected boolean isEmpty()

Specified by:

isEmpty in class AbstractQueueStoreDelegate

Returns:

true if the queue is empty, false otherwise

doClear

public void doClear()

Description copied from class: AbstractQueueStoreDelegate

Removes all the items in the queue

Specified by:

doClear in class AbstractQueueStoreDelegate

doAddAll

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

Description copied from class: AbstractQueueStoreDelegate

Adds all the items at the end of the queue

Specified by:

doAddAll in class AbstractQueueStoreDelegate

Parameters:

items - objects to add

Returns:

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

allElements

public Collection<Serializable> allElements()

remove

public void remove(Serializable value)

Description copied from interface: TransactionalQueueStoreDelegate

Remove the specified value from the queue. Used only during recovery phase which means this method does not require great performance

Specified by:

remove in interface TransactionalQueueStoreDelegate

Parameters:

value - object to be removed

contains

public boolean contains(Serializable value)

Description copied from interface: TransactionalQueueStoreDelegate

checks if the given value exists in the queue Used only during recovery phase which means this method does not require great performance

Specified by:

contains in interface TransactionalQueueStoreDelegate

Parameters:

value - object to check if exists in the queue

close

public void close()

Description copied from interface: TransactionalQueueStoreDelegate

Releases all resources managed by this queue without removing the queue data.

Specified by:

close in interface TransactionalQueueStoreDelegate

dispose

public void dispose()

Description copied from interface: QueueStoreDelegate

Deletes the queue and it's content.

Specified by:

dispose in interface QueueStoreDelegate