org.exoplatform.container.context

Class AbstractContext<K>

java.lang.Object

org.exoplatform.container.context.AbstractContext<K>

All Implemented Interfaces:

javax.enterprise.context.spi.Context, ThreadContextHolder, AdvancedContext<K>

Direct Known Subclasses:

SharedContext, UnSharedContext

public abstract class AbstractContext<K>
extends Object
implements AdvancedContext<K>, ThreadContextHolder

This is the root class of all the implementations of an AdvancedContext

Version:

$Id$

Author:

Nicolas Filotto

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
protected static class	AbstractContext.ThreadLocalData This class encapsulates all the data stored into the ThreadLocal variable

Field Summary

Fields inherited from interface org.exoplatform.container.component.ThreadContextHolder

MANAGE_THREAD_LOCAL

Constructor Summary

Constructors

Constructor and Description
AbstractContext()

Method Summary

Modifier and Type	Method and Description
void	activate(K key) Activates the current context using the given key within the context of the thread
protected abstract CreationContextStorage	createStorage(K key) Creates a CreationContextStorage instance from the given key
void	deactivate(K key) Deactivates the current context using the given key from the context of the thread
protected void	destroy() Destroys all the CreationContext that has been stored in the current storage
void	destroy(javax.enterprise.context.spi.Contextual contextual) Destroy the existing contextual instance.
protected void	destroy(CreationContextStorage storage) Destroys all the CreationContext that has been stored in the given storage
<T> T	get(javax.enterprise.context.spi.Contextual<T> contextual)
<T> T	get(javax.enterprise.context.spi.Contextual<T> contextual, javax.enterprise.context.spi.CreationalContext<T> creationalContext)
protected <T> T	getFromCache(AbstractContext.ThreadLocalData data, String id) Gets the component from the cache if it has already been registered
protected <T> String	getId(javax.enterprise.context.spi.Contextual<T> contextual) Gives an id for the given Contextual
protected <T> T	getInstance(CreationContextStorage storage, String id) Gives the instance stored with the given Contextual id.
protected abstract Lock	getLock(String id) In case the context is sharable, we will need a lock to synchronize the accesses
protected CreationContextStorage	getStorage() Gives the storage to use to store and access to the CreationContext
ThreadContext	getThreadContext() Gives the value corresponding to the context of the thread
boolean	isActive()
protected abstract boolean	isSharable() Indicates whether the objects of the context that can shared or not.
protected void	putInCache(AbstractContext.ThreadLocalData data, String id, Object o) Puts in the cache a given object instance corresponding to the given id
void	register(K key) Registers a new key to the context
protected void	setStorage(CreationContextStorage storage) Sets the current storage
void	unregister(K key) Unregisters a given key from the context

Methods inherited from class java.lang.Object

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

Methods inherited from interface javax.enterprise.context.spi.Context

getScope

Constructor Detail

AbstractContext

public AbstractContext()

Method Detail

get

public <T> T get(javax.enterprise.context.spi.Contextual<T> contextual,
                 javax.enterprise.context.spi.CreationalContext<T> creationalContext)

Specified by:

get in interface javax.enterprise.context.spi.Context

get

public <T> T get(javax.enterprise.context.spi.Contextual<T> contextual)

Specified by:

get in interface javax.enterprise.context.spi.Context

destroy

public void destroy(javax.enterprise.context.spi.Contextual contextual)

Destroy the existing contextual instance. If there is no existing instance, no action is taken.

Specified by:

destroy in interface AdvancedContext<K>

Parameters:

contextual - the contextual type

isActive

public boolean isActive()

Specified by:

isActive in interface javax.enterprise.context.spi.Context

activate

public void activate(K key)

Activates the current context using the given key within the context of the thread

Specified by:

activate in interface AdvancedContext<K>

Parameters:

key - the key to use to activate the context

deactivate

public void deactivate(K key)

Deactivates the current context using the given key from the context of the thread

Specified by:

deactivate in interface AdvancedContext<K>

Parameters:

key - the key to use to deactivate the context

register

public void register(K key)

Registers a new key to the context

Specified by:

register in interface AdvancedContext<K>

Parameters:

key - the key to register

unregister

public void unregister(K key)

Unregisters a given key from the context

Specified by:

unregister in interface AdvancedContext<K>

Parameters:

key - the key to unregister

getId

protected <T> String getId(javax.enterprise.context.spi.Contextual<T> contextual)

Gives an id for the given Contextual

Parameters:

contextual - the contextual object for which we want an id

isSharable

protected abstract boolean isSharable()

Indicates whether the objects of the context that can shared or not. sharable

Returns:

true if the components are sharable, false otherwise.

getLock

protected abstract Lock getLock(String id)

In case the context is sharable, we will need a lock to synchronize the accesses

Parameters:

id - the id of the contextual for which we want a lock

Returns:

a lock corresponding to the given contextual within the current context

createStorage

protected abstract CreationContextStorage createStorage(K key)

Creates a CreationContextStorage instance from the given key

Parameters:

key - the key to use to create the CreationContextStorage

Returns:

the CreationContextStorage corresponding to the given key

getStorage

protected CreationContextStorage getStorage()

Gives the storage to use to store and access to the CreationContext

Returns:

the CreationContextStorage corresponding to the current context

setStorage

protected void setStorage(CreationContextStorage storage)

Sets the current storage

Parameters:

storage - the new current storage. Set it to null to remove the current storage

destroy

protected void destroy()

Destroys all the CreationContext that has been stored in the current storage

destroy

protected void destroy(CreationContextStorage storage)

Destroys all the CreationContext that has been stored in the given storage

Parameters:

storage - the storage that we would like to cleanup

getInstance

protected <T> T getInstance(CreationContextStorage storage,
                            String id)

Gives the instance stored with the given Contextual id.

Parameters:

storage - the storage from which we will get the instance

id - the id of the contextual for which we want the instance

Returns:

the corresponding instance if it exists, null otherwise

getFromCache

protected <T> T getFromCache(AbstractContext.ThreadLocalData data,
                             String id)

Gets the component from the cache if it has already been registered

Parameters:

data - the data corresponding to the current context

id - the id of the component

Returns:

the corresponding component if is already in the cache

putInCache

protected void putInCache(AbstractContext.ThreadLocalData data,
                          String id,
                          Object o)

Puts in the cache a given object instance corresponding to the given id

Parameters:

data - the data corresponding to the current context

id - the id of the component

o - the corresponding instance

getThreadContext

public ThreadContext getThreadContext()

Gives the value corresponding to the context of the thread

Specified by:

getThreadContext in interface ThreadContextHolder

Returns:

a new instance of ThreadContext if there are some valuable ThreadLocal variables to share otherwise null is expected