| /* |
| * 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.openapi.progress; |
| |
| import com.intellij.openapi.application.ApplicationManager; |
| import com.intellij.openapi.diagnostic.Logger; |
| import org.jetbrains.annotations.NotNull; |
| |
| import java.util.ArrayDeque; |
| import java.util.Queue; |
| |
| @SomeQueue |
| public abstract class AbstractTaskQueue<T> { |
| private final static Logger LOG = Logger.getInstance("#com.intellij.openapi.progress.AbstractTaskQueue"); |
| |
| private final Object myLock; |
| private final Queue<T> myQueue; |
| private boolean myActive; |
| protected final Runnable myQueueWorker; |
| |
| public AbstractTaskQueue() { |
| myLock = new Object(); |
| myQueue = new ArrayDeque<T>(); |
| myActive = false; |
| myQueueWorker = new MyWorker(); |
| } |
| |
| /** |
| * !!! done under lock! (to allow single failures when putting into the execution queue) |
| * Should run {@link #myQueueWorker} |
| */ |
| protected abstract void runMe(); |
| protected abstract void runStuff(T stuff); |
| |
| public void run(@NotNull final T stuff) { |
| if (ApplicationManager.getApplication().isUnitTestMode()) { |
| runStuff(stuff); |
| return; |
| } |
| synchronized (myLock) { |
| try { |
| myQueue.add(stuff); |
| if (! myActive) { |
| runMe(); |
| } |
| } catch (Throwable t) { |
| LOG.info(t); |
| throw t instanceof RuntimeException ? ((RuntimeException) t) : new RuntimeException(t); |
| } finally { |
| myActive = true; |
| } |
| } |
| } |
| |
| private class MyWorker implements Runnable { |
| public void run() { |
| while (true) { |
| try { |
| final T stuff; |
| synchronized (myLock) { |
| stuff = myQueue.poll(); |
| } |
| if (stuff != null) { |
| // each task is executed only once, once it has been taken from the queue.. |
| runStuff(stuff); |
| } |
| } catch (Throwable t) { |
| LOG.info(t); |
| } finally { |
| synchronized (myLock) { |
| if (myQueue.isEmpty()) { |
| myActive = false; |
| return; |
| } |
| } |
| } |
| } |
| } |
| } |
| } |