Java Doc for RunnableQueue.java in  » Graphic-Library » batik » org » apache » batik » util » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Graphic Library » batik » 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: RunnableQueue.java 501495 2007-01-30 18:00:36Z dvholten $ Inner Class :final public static class RunnableQueueState Inner Class :public interface IdleRunnable extends Runnable Inner Class :public interface RunHandler Inner Class :public static class RunHandlerAdapter implements RunHandler Inner Class :protected static class Link extends DoublyLinkedList.Node Inner Class :protected static class LockableLink extends Link Field Summary final public static  RunnableQueueState RUNNING      The queue is in the process of running tasks. final public static  RunnableQueueState SUSPENDED      The queue is no longer running any tasks and will not run any tasks until resumeExecution is called. final public static  RunnableQueueState SUSPENDING      The queue may still be running tasks but as soon as possible will go to SUSPENDED state. protected  int preemptCount      Count of preempt entries in queue, so preempt entries can be kept properly ordered. protected  RunHandler runHandler      The object which handle run events. protected volatile  HaltingThread runnableQueueThread      The current thread. protected volatile  RunnableQueueState state      The Suspension state of this thread. final protected  Object stateLock      Object to synchronize/wait/notify for suspension issues. protected  boolean wasResumed      Used to indicate if the queue was resumed while still running, so a 'resumed' event can be sent. Method Summary public static  RunnableQueue createRunnableQueue()      Creates a new RunnableQueue started in a new thread. protected synchronized  void executionResumed()      Called when execution is being resumed. protected synchronized  void executionSuspended()      Called when execution is being suspended. public  Object getIteratorLock()      Returns iterator lock to use to work with the iterator returned by iterator(). public  RunnableQueueState getQueueState()      public synchronized  RunHandler getRunHandler()      Returns the RunHandler or null. public  HaltingThread getThread()      Returns the thread in which the RunnableQueue is currently running. public  void invokeAndWait(Runnable r)      Waits until the given Runnable's run() has returned. public  void invokeLater(Runnable r)      Schedules the given Runnable object for a later invocation, and returns. public  Iterator iterator()      Returns an iterator over the runnables. public  void preemptAndWait(Runnable r)      Waits until the given Runnable's run() has returned. public  void preemptLater(Runnable r)      Schedules the given Runnable object for a later invocation, and returns. public  void resumeExecution()      Resumes the execution of this queue. public  void run()      Runs this queue. protected synchronized  void runnableInvoked(Runnable rable)      Called when a Runnable completes. protected synchronized  void runnableStart(Runnable rable)      Called just prior to executing a Runnable. public  void setIdleRunnable(IdleRunnable r)      Sets a Runnable to be run whenever the queue is empty. public synchronized  void setRunHandler(RunHandler rh)      Sets the RunHandler for this queue. public  void suspendExecution(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 process 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. preemptCount protected int preemptCount(Code) Count of preempt entries in queue, so preempt entries can be kept properly ordered. runHandler protected RunHandler runHandler(Code) The object which handle run events. runnableQueueThread protected volatile HaltingThread runnableQueueThread(Code) The current thread. state protected volatile RunnableQueueState state(Code) The Suspension state of this thread. stateLock final protected Object stateLock(Code) Object to synchronize/wait/notify for suspension issues. wasResumed protected boolean wasResumed(Code) Used to indicate if the queue was resumed while still running, so a 'resumed' event can be sent. Method Detail createRunnableQueue public static RunnableQueue createRunnableQueue()(Code) Creates a new RunnableQueue started in a new thread. a RunnableQueue which is guaranteed 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 HaltingThread 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. runnableStart protected synchronized void runnableStart(Runnable rable)(Code) Called just prior to executing a Runnable. Currently just notifies runHandler Parameters:   rable - The runnable that is about to start setIdleRunnable public void setIdleRunnable(IdleRunnable r)(Code) Sets a Runnable to be run whenever the queue is empty. 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)