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Java Source Code / Java Documentation » Development » Javolution » javolution.context

Source Cross Reference Class Diagram Java Document (Java Doc)

java.lang .Object

javolution.context .Context

All known Subclasses:   javolution.context .PersistentContext,  javolution.context .LogContext,  javolution.context .SecurityContext,  javolution.context .ConcurrentContext,  javolution.context .AllocatorContext,  javolution.context .LocalContext,
Context
abstract public class Context implements XMLSerializable(Code)

This class represents an execution context; they can be associated to particular threads or objects.

Context-aware applications may extend the context base class or any predefined contexts in order to facilitate separation of concerns.

The scope of a Context should be surrounded by a try, finally block statement to ensure correct behavior in case of exceptions being raised. For example:[code] LocalContext.enter(); // Current thread enter a local context. try ModuloInteger.setModulus(m); // No impact on other threads! z = x.times(y); // Multiplication modulo m. } finally { LocalContext.exit(); }[/code]

author:
   Jean-Marie Dautelle
version:
   5.0, April 15, 2007

Field Summary
final public static Context ROOT
     Holds the root context (top context of all threads).

Constructor Summary
protected Context()
     Default constructor.

Method Summary
final public static Context enter(Context context)
     Enters the specified context.
Parameters:
  context - the context being entered.
final public static Context enter(Class contextType)
     Enters a factory produced context of specified type to be recycled after Context.exit exiting . This method is called by the static enter() method of specialized contexts.
abstract protected void enterAction()
     The action to be performed after this context becomes the current context.
public static Context exit()
     Exits the current context (the Context.getOuter outer context becomes the current context).
final public static void exit(Context ctx)

abstract protected void exitAction()
     The action to be performed before this context is no more the current context.
final AllocatorContext getAllocatorContext()
     Returns the allocator context used while in this context (shortcut).
public static Context getCurrent()
     Returns the current context for the current thread.
final public Context getOuter()
     Returns the outer context of this context or null if Context.ROOT .
final public Thread getOwner()
     Returns the current owner of this context.
protected static void setCurrent(ConcurrentContext context)
     Sets the current context, used by ConcurrentContext exclusively.
public String toString()
     Returns the string representation of this context (default "Instance of " + this.getClass().getName()).

Field Detail
ROOT
final public static Context ROOT(Code)
Holds the root context (top context of all threads).

Constructor Detail
Context
protected Context()(Code)
Default constructor.

Method Detail
enter
final public static Context enter(Context context)(Code)
Enters the specified context.
Parameters:
  context - the context being entered. the specified context.
throws:
  IllegalStateException - if this context is currently in use.

enter
final public static Context enter(Class contextType)(Code)
Enters a factory produced context of specified type to be recycled after Context.exit exiting . This method is called by the static enter() method of specialized contexts. If the context class has no public no-arg constructor accessible, then the factory for the class should be ObjectFactory.setInstance explicitely set (typically in a static initializer).
Parameters:
  contextType - the type of context being entered. the context being entered.
See Also:   ObjectFactory.getInstance(Class)

enterAction
abstract protected void enterAction()(Code)
The action to be performed after this context becomes the current context.

exit
public static Context exit()(Code)
Exits the current context (the Context.getOuter outer context becomes the current context). the context which has been exited.
throws:
  IllegalStateException - if this context is the Context.ROOT context.

exit
final public static void exit(Context ctx)(Code)
Context.exit()

exitAction
abstract protected void exitAction()(Code)
The action to be performed before this context is no more the current context.

getAllocatorContext
final AllocatorContext getAllocatorContext()(Code)
Returns the allocator context used while in this context (shortcut). the allocator context for this context.

getCurrent
public static Context getCurrent()(Code)
Returns the current context for the current thread. the current context.

getOuter
final public Context getOuter()(Code)
Returns the outer context of this context or null if Context.ROOT . the outer context or null.

getOwner
final public Thread getOwner()(Code)
Returns the current owner of this context. The owner of a context is the thread which Context.enter(Context) entered the context and has not yet Context.exit(Context) exited . A context can only have one owner at any given time, although contexts can be shared by ConcurrentContext concurrent threads. the thread owner of this context or null.

setCurrent
protected static void setCurrent(ConcurrentContext context)(Code)
Sets the current context, used by ConcurrentContext exclusively.
Parameters:
  context - the concurrent context.

toString
public String toString()(Code)
Returns the string representation of this context (default "Instance of " + this.getClass().getName()). the string representation of this context.

Methods inherited from java.lang.Object
native protected Object clone() throws CloneNotSupportedException(Code)(Java Doc)
public boolean equals(Object obj)(Code)(Java Doc)
protected void finalize() throws Throwable(Code)(Java Doc)
final native public Class getClass()(Code)(Java Doc)
native public int hashCode()(Code)(Java Doc)
final native public void notify()(Code)(Java Doc)
final native public void notifyAll()(Code)(Java Doc)
public String toString()(Code)(Java Doc)
final native public void wait(long timeout) throws InterruptedException(Code)(Java Doc)
final public void wait(long timeout, int nanos) throws InterruptedException(Code)(Java Doc)
final public void wait() throws InterruptedException(Code)(Java Doc)

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