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Java Source Code / Java Documentation » IDE Netbeans » visualweb.api.designer » org.apache.batik.util 
Source Cross Reference  Class Diagram Java Document (Java Doc) 


java.lang.Object
   org.apache.batik.util.RunnableQueue

RunnableQueue
public class RunnableQueue implements Runnable(Code)
This class represents an object which queues Runnable objects for invocation in a single thread.
author:
   Stephane Hillion
version:
   $Id$

Inner Class :public static class RunnableQueueState extends Object
Inner Class :public interface RunHandler
Inner Class :protected static class Link extends DoublyLinkedList.Node
Inner Class :protected static class LockableLink extends Link

Field Summary
final public static  RunnableQueueStateRUNNING
     The queue is in the processes of running tasks.
final public static  RunnableQueueStateSUSPENDED
     The queue is no longer running any tasks and will not run any tasks until resumeExecution is called.
final public static  RunnableQueueStateSUSPENDING
     The queue may still be running tasks but as soon as possible will go to SUSPENDED state.
protected  DoublyLinkedListlist
     The Runnable objects list, also used as synchoronization point for pushing/poping runables.
protected  intpreemptCount
    
protected  RunHandlerrunHandler
     The object which handle run events.
protected  ThreadrunnableQueueThread
     The current thread.
protected  RunnableQueueStatestate
     The Suspension state of this thread.
protected  ObjectstateLock
     Object to synchronize/wait/notify for suspension issues.


Method Summary
public static  RunnableQueuecreateRunnableQueue()
     Creates a new RunnableQueue started in a new thread.
protected synchronized  voidexecutionResumed()
     Called when execution is being resumed.
protected synchronized  voidexecutionSuspended()
     Called when execution is being suspended.
public  ObjectgetIteratorLock()
     Returns iterator lock to use to work with the iterator returned by iterator().
public  RunnableQueueStategetQueueState()
    
public synchronized  RunHandlergetRunHandler()
     Returns the RunHandler or null.
public  ThreadgetThread()
     Returns the thread in which the RunnableQueue is currently running.
public  voidinvokeAndWait(Runnable r)
     Waits until the given Runnable's run() has returned.
public  voidinvokeLater(Runnable r)
     Schedules the given Runnable object for a later invocation, and returns.
public  Iteratoriterator()
     Returns an iterator over the runnables.
public  voidpreemptAndWait(Runnable r)
     Waits until the given Runnable's run() has returned.
public  voidpreemptLater(Runnable r)
     Schedules the given Runnable object for a later invocation, and returns.
public  voidresumeExecution()
     Resumes the execution of this queue.
public  voidrun()
     Runs this queue.
protected synchronized  voidrunnableInvoked(Runnable rable)
     Called when a Runnable completes.
public synchronized  voidsetRunHandler(RunHandler rh)
     Sets the RunHandler for this queue.
public  voidsuspendExecution(boolean waitTillSuspended)
     Suspends the execution of this queue after the current runnable completes.
Parameters:
  waitTillSuspended - if true this method will not returnuntil the queue has suspended (no runnable in progressor about to be in progress).

Field Detail
RUNNING
final public static RunnableQueueState RUNNING(Code)
The queue is in the processes of running tasks.



SUSPENDED
final public static RunnableQueueState SUSPENDED(Code)
The queue is no longer running any tasks and will not run any tasks until resumeExecution is called.



SUSPENDING
final public static RunnableQueueState SUSPENDING(Code)
The queue may still be running tasks but as soon as possible will go to SUSPENDED state.



list
protected DoublyLinkedList list(Code)
The Runnable objects list, also used as synchoronization point for pushing/poping runables.



preemptCount
protected int preemptCount(Code)



runHandler
protected RunHandler runHandler(Code)
The object which handle run events.



runnableQueueThread
protected Thread runnableQueueThread(Code)
The current thread.



state
protected RunnableQueueState state(Code)
The Suspension state of this thread.



stateLock
protected Object stateLock(Code)
Object to synchronize/wait/notify for suspension issues.





Method Detail
createRunnableQueue
public static RunnableQueue createRunnableQueue()(Code)
Creates a new RunnableQueue started in a new thread. a RunnableQueue which is garanteed to have entered itsrun() method.



executionResumed
protected synchronized void executionResumed()(Code)
Called when execution is being resumed. Currently just notifies runHandler



executionSuspended
protected synchronized void executionSuspended()(Code)
Called when execution is being suspended. Currently just notifies runHandler



getIteratorLock
public Object getIteratorLock()(Code)
Returns iterator lock to use to work with the iterator returned by iterator().



getQueueState
public RunnableQueueState getQueueState()(Code)



getRunHandler
public synchronized RunHandler getRunHandler()(Code)
Returns the RunHandler or null.



getThread
public Thread getThread()(Code)
Returns the thread in which the RunnableQueue is currently running. null if the RunnableQueue has not entered hisrun() method.



invokeAndWait
public void invokeAndWait(Runnable r) throws InterruptedException(Code)
Waits until the given Runnable's run() has returned. Note: invokeAndWait() must not be called from the current thread (for example from the run() method of the argument).
throws:
  IllegalStateException - if getThread() is null or if thethread returned by getThread() is the current one.



invokeLater
public void invokeLater(Runnable r)(Code)
Schedules the given Runnable object for a later invocation, and returns. An exception is thrown if the RunnableQueue was not started.
throws:
  IllegalStateException - if getThread() is null.



iterator
public Iterator iterator()(Code)
Returns an iterator over the runnables.



preemptAndWait
public void preemptAndWait(Runnable r) throws InterruptedException(Code)
Waits until the given Runnable's run() has returned. The given runnable preempts any runnable that is not currently executing (ie the next runnable started will be the one given). Note: preemptAndWait() must not be called from the current thread (for example from the run() method of the argument).
throws:
  IllegalStateException - if getThread() is null or if thethread returned by getThread() is the current one.



preemptLater
public void preemptLater(Runnable r)(Code)
Schedules the given Runnable object for a later invocation, and returns. The given runnable preempts any runnable that is not currently executing (ie the next runnable started will be the one given). An exception is thrown if the RunnableQueue was not started.
throws:
  IllegalStateException - if getThread() is null.



resumeExecution
public void resumeExecution()(Code)
Resumes the execution of this queue.
throws:
  IllegalStateException - if getThread() is null.



run
public void run()(Code)
Runs this queue.



runnableInvoked
protected synchronized void runnableInvoked(Runnable rable)(Code)
Called when a Runnable completes. Currently just notifies runHandler
Parameters:
  rable - The runnable that just completed.



setRunHandler
public synchronized void setRunHandler(RunHandler rh)(Code)
Sets the RunHandler for this queue.



suspendExecution
public void suspendExecution(boolean waitTillSuspended)(Code)
Suspends the execution of this queue after the current runnable completes.
Parameters:
  waitTillSuspended - if true this method will not returnuntil the queue has suspended (no runnable in progressor about to be in progress). If resumeExecution iscalled while waiting will simply return (this reallyindicates a race condition in your code). This mayreturn before an associated RunHandler is notified.
throws:
  IllegalStateException - if getThread() is null.



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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