| /* |
| * Copyright 2000-2009 JetBrains s.r.o. |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| package com.intellij.debugger.impl; |
| |
| import com.intellij.openapi.application.ApplicationManager; |
| import com.intellij.openapi.diagnostic.Logger; |
| import com.sun.jdi.VMDisconnectedException; |
| import org.jetbrains.annotations.NotNull; |
| |
| import java.util.concurrent.*; |
| |
| /** |
| * @author lex |
| */ |
| public abstract class InvokeThread<E extends PrioritizedTask> { |
| private static final Logger LOG = Logger.getInstance("#com.intellij.debugger.impl.InvokeThread"); |
| |
| private static final ThreadLocal<WorkerThreadRequest> ourWorkerRequest = new ThreadLocal<WorkerThreadRequest>(); |
| |
| public static final class WorkerThreadRequest<E extends PrioritizedTask> implements Runnable { |
| private final InvokeThread<E> myOwner; |
| private volatile Future<?> myRequestFuture; |
| private volatile boolean myStopRequested = false; |
| |
| WorkerThreadRequest(InvokeThread<E> owner) { |
| myOwner = owner; |
| } |
| |
| @Override |
| public void run() { |
| synchronized (this) { |
| while (myRequestFuture == null) { |
| try { |
| wait(); |
| } |
| catch (InterruptedException ignore) { |
| } |
| } |
| } |
| ourWorkerRequest.set(this); |
| try { |
| myOwner.run(this); |
| } |
| finally { |
| ourWorkerRequest.set(null); |
| boolean b = Thread.interrupted(); // reset interrupted status to return into pool |
| } |
| } |
| |
| public void requestStop() { |
| final Future<?> future = myRequestFuture; |
| assert future != null; |
| myStopRequested = true; |
| future.cancel(true); |
| } |
| |
| public boolean isStopRequested() { |
| final Future<?> future = myRequestFuture; |
| assert future != null; |
| return myStopRequested || future.isCancelled() || future.isDone(); |
| } |
| |
| public void join() throws InterruptedException, ExecutionException { |
| assert myRequestFuture != null; |
| try { |
| myRequestFuture.get(); |
| } |
| catch(CancellationException ignored) { |
| } |
| } |
| |
| public void join(long timeout) throws InterruptedException, ExecutionException { |
| assert myRequestFuture != null; |
| try { |
| myRequestFuture.get(timeout, TimeUnit.MILLISECONDS); |
| } |
| catch (TimeoutException ignored) { |
| } |
| catch (CancellationException ignored) { |
| } |
| } |
| |
| final void setRequestFuture(Future<?> requestFuture) { |
| synchronized (this) { |
| myRequestFuture = requestFuture; |
| notifyAll(); |
| } |
| } |
| |
| public InvokeThread<E> getOwner() { |
| return myOwner; |
| } |
| |
| public boolean isDone() { |
| assert myRequestFuture != null; |
| return myRequestFuture.isDone() && ourWorkerRequest.get() == null; |
| } |
| } |
| |
| protected final EventQueue<E> myEvents; |
| |
| private volatile WorkerThreadRequest myCurrentRequest = null; |
| |
| public InvokeThread() { |
| myEvents = new EventQueue<E>(PrioritizedTask.Priority.values().length); |
| startNewWorkerThread(); |
| } |
| |
| protected abstract void processEvent(E e); |
| |
| protected void startNewWorkerThread() { |
| final WorkerThreadRequest workerRequest = new WorkerThreadRequest<E>(this); |
| myCurrentRequest = workerRequest; |
| workerRequest.setRequestFuture( ApplicationManager.getApplication().executeOnPooledThread(workerRequest) ); |
| } |
| |
| private void run(final @NotNull WorkerThreadRequest threadRequest) { |
| try { |
| while(true) { |
| try { |
| if(threadRequest.isStopRequested()) { |
| break; |
| } |
| |
| final WorkerThreadRequest currentRequest = getCurrentRequest(); |
| if(currentRequest != threadRequest) { |
| LOG.error("Expected " + threadRequest + " instead of " + currentRequest); |
| if (currentRequest != null && !currentRequest.isDone()) { |
| continue; // ensure events are processed by one thread at a time |
| } |
| } |
| |
| processEvent(myEvents.get()); |
| } |
| catch (VMDisconnectedException ignored) { |
| break; |
| } |
| catch (EventQueueClosedException ignored) { |
| break; |
| } |
| catch (RuntimeException e) { |
| if(e.getCause() instanceof InterruptedException) { |
| break; |
| } |
| LOG.error(e); |
| } |
| catch (Throwable e) { |
| LOG.error(e); |
| } |
| } |
| } |
| finally { |
| // ensure that all scheduled events are processed |
| if (threadRequest == getCurrentRequest()) { |
| for (E event : myEvents.clearQueue()) { |
| try { |
| processEvent(event); |
| } |
| catch (Throwable ignored) { |
| } |
| } |
| } |
| |
| if (LOG.isDebugEnabled()) { |
| LOG.debug("Request " + toString() + " exited"); |
| } |
| } |
| |
| } |
| |
| protected static InvokeThread currentThread() { |
| final WorkerThreadRequest request = getCurrentThreadRequest(); |
| return request != null? request.getOwner() : null; |
| } |
| |
| public boolean schedule(E r) { |
| if(LOG.isDebugEnabled()) { |
| LOG.debug("schedule " + r + " in " + this); |
| } |
| return myEvents.put(r, r.getPriority().ordinal()); |
| } |
| |
| public boolean pushBack(E r) { |
| if(LOG.isDebugEnabled()) { |
| LOG.debug("pushBack " + r + " in " + this); |
| } |
| return myEvents.pushBack(r, r.getPriority().ordinal()); |
| } |
| |
| protected void switchToRequest(WorkerThreadRequest newRequest) { |
| final WorkerThreadRequest currentThreadRequest = getCurrentThreadRequest(); |
| LOG.assertTrue(currentThreadRequest != null); |
| myCurrentRequest = newRequest; |
| if (LOG.isDebugEnabled()) { |
| LOG.debug("Closing " + currentThreadRequest + " new request = " + newRequest); |
| } |
| |
| currentThreadRequest.requestStop(); |
| } |
| |
| public WorkerThreadRequest getCurrentRequest() { |
| return myCurrentRequest; |
| } |
| |
| public static WorkerThreadRequest getCurrentThreadRequest() { |
| return ourWorkerRequest.get(); |
| } |
| |
| public void close() { |
| myEvents.close(); |
| if (LOG.isDebugEnabled()) { |
| LOG.debug("Closing evaluation"); |
| } |
| } |
| } |