Package org.apache.wicket.pageStore

Class AsynchronousPageStore

java.lang.Object

org.apache.wicket.pageStore.DelegatingPageStore

org.apache.wicket.pageStore.AsynchronousPageStore

All Implemented Interfaces:

IPageStore

public class AsynchronousPageStore
extends DelegatingPageStore

Facade for IPageStore moving addPage(IPageContext, IManageablePage) to a worker thread.

Creates an AsynchronousPageStore.PendingAdd for addPage(IPageContext, IManageablePage) and puts ito a queue. Later AsynchronousPageStore.PageAddingRunnable reads in blocking manner from queue and performs the add.

It starts only one instance of AsynchronousPageStore.PageAddingRunnable because all we need is to make the page storing asynchronous. We don't want to write concurrently in the wrapped IPageStore, though it may happen in the extreme case when the queue is full. These cases should be avoided.

Author:

Matej Knopp, manuelbarzi

Constructor Summary

Constructors

Constructor	Description
AsynchronousPageStore(IPageStore delegate, int capacity)	Construct.

Method Summary

Modifier and Type	Method	Description
void	addPage(IPageContext context, IManageablePage page)	Stores the page-
void	destroy()	Destroy the store.
IManageablePage	getPage(IPageContext context, int pageId)	Restores a page from storage.
void	removeAllPages(IPageContext context)	All pages should be removed from storage for the given context.
void	removePage(IPageContext context, IManageablePage page)	Removes a page from storage.

Methods inherited from class org.apache.wicket.pageStore.DelegatingPageStore

detach, end, getDelegate, revertPage, supportsVersioning

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.apache.wicket.pageStore.IPageStore

canBeAsynchronous

Constructor Details

AsynchronousPageStore

public AsynchronousPageStore(IPageStore delegate,
 int capacity)

Construct.

Parameters:

delegate - the wrapped IPageStore that actually saved the page

capacity - the capacity of the queue that delays the saving

Method Details

destroy

public void destroy()

Description copied from interface: IPageStore

Destroy the store.

Specified by:

destroy in interface IPageStore

Overrides:

destroy in class DelegatingPageStore

getPage

public IManageablePage getPage(IPageContext context,
 int pageId)

Description copied from interface: IPageStore

Restores a page from storage.

Specified by:

getPage in interface IPageStore

Overrides:

getPage in class DelegatingPageStore

Parameters:

context - the context of the page

pageId - the id of the page.

Returns:

the page

removePage

public void removePage(IPageContext context,
 IManageablePage page)

Description copied from interface: IPageStore

Removes a page from storage.

Specified by:

removePage in interface IPageStore

Overrides:

removePage in class DelegatingPageStore

Parameters:

context - the context of the page

page - the page.

addPage

public void addPage(IPageContext context,
 IManageablePage page)

Description copied from interface: IPageStore

Stores the page-

Specified by:

addPage in interface IPageStore

Overrides:

addPage in class DelegatingPageStore

Parameters:

context - the context of the page

page - the page.

removeAllPages

public void removeAllPages(IPageContext context)

Description copied from interface: IPageStore

All pages should be removed from storage for the given context.

Specified by:

removeAllPages in interface IPageStore

Overrides:

removeAllPages in class DelegatingPageStore

Parameters:

context - the context of the pages