net.walend.lyophil.queuedwrite
Class QueuedWriteFreezer

java.lang.Object
  |
  +--net.walend.lyophil.queuedwrite.QueuedWriteFreezer

All Implemented Interfaces:

Freezer

Direct Known Subclasses:

SleepyQueuedWriteFreezer

public class QueuedWriteFreezer

extends java.lang.Object

implements Freezer

When this Freezer freeze()s, throwOut()s or throwOutAll()s, it puts Runnable commands into a EDU.oswego.cs.dl.util.concurrent.QueuedExecutor, to write on a separate thread. All other methods get passed to the Freezer defined in QueuedWriterFreezer.MasterFreezer.

Since:

20010907

Author:

David Walend

Nested Class Summary

private class	QueuedWriteFreezer.Command
private class	QueuedWriteFreezer.FreezeCommand
private class	QueuedWriteFreezer.ThrowOutAllCommand
private class	QueuedWriteFreezer.ThrowOutCommand

Field Summary

private EDU.oswego.cs.dl.util.concurrent.Executor	executor
static java.lang.String	MASTERFREEZER

Fields inherited from interface net.walend.lyophil.Freezer

ROLE

Constructor Summary

QueuedWriteFreezer()
An empty constructor so that this Freezer can be created by a GenericDirector.

Method Summary

int	count() Returns the number of elements in this collection.
void	freeze(Freezable victem) Take the Thawed victem and put it in cold storage.
SetOfFreezables	getAll() Returns a lyophilizer.collection.Set of Freezables.
protected Freezer	getMasterFreezer()
boolean	isAvailable(java.io.Serializable identifier) Return true if identifier is available in the freezer
boolean	isEmpty() Returns true if this collection contains no elements.
Freezable	thaw(java.io.Serializable identifier) For the identifier, return a Freezable object containing the data.
void	throwOut(java.io.Serializable identifier) Remote the Freezable identified by identifier from the persistent storage
void	throwOutAll() Throw out everything in the Freezer.

Methods inherited from class java.lang.Object

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

Field Detail

MASTERFREEZER

public static final java.lang.String MASTERFREEZER

executor

private EDU.oswego.cs.dl.util.concurrent.Executor executor

Constructor Detail

QueuedWriteFreezer

public QueuedWriteFreezer()

An empty constructor so that this Freezer can be created by a GenericDirector.

Method Detail

getMasterFreezer

protected Freezer getMasterFreezer()

freeze

public void freeze(Freezable victem)

Take the Thawed victem and put it in cold storage.

Specified by:

freeze in interface Freezer

Throws:

CannotFreezeException

thaw

public Freezable thaw(java.io.Serializable identifier)
               throws NotInFreezerException

For the identifier, return a Freezable object containing the data.

Specified by:

thaw in interface Freezer

Throws:

CannotThawException

NotInFreezerException

throwOut

public void throwOut(java.io.Serializable identifier)
              throws NotInFreezerException

Remote the Freezable identified by identifier from the persistent storage

Specified by:

throwOut in interface Freezer

Throws:

CannotThrowOutException

NotInFreezerException

isAvailable

public boolean isAvailable(java.io.Serializable identifier)

Return true if identifier is available in the freezer

Specified by:

isAvailable in interface Freezer

Throws:

PersistenceFailureException

throwOutAll

public void throwOutAll()

Throw out everything in the Freezer.

Specified by:

throwOutAll in interface Freezer

getAll

public SetOfFreezables getAll()

Returns a lyophilizer.collection.Set of Freezables.

Specified by:

getAll in interface Freezer

Throws:

PersistenceFailureException

count

public int count()

Returns the number of elements in this collection. If this collection contains more than Integer.MAX_VALUE elements, returns Integer.MAX_VALUE.

Specified by:

count in interface Freezer

isEmpty

public boolean isEmpty()

Returns true if this collection contains no elements.

Specified by:

isEmpty in interface Freezer