| /* |
| * Copyright 2000-2014 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.util.indexing; |
| |
| import com.intellij.openapi.application.ApplicationManager; |
| import com.intellij.openapi.util.Computable; |
| import org.jetbrains.annotations.NotNull; |
| |
| import java.util.concurrent.BlockingQueue; |
| import java.util.concurrent.LinkedBlockingQueue; |
| import java.util.concurrent.TimeUnit; |
| import java.util.concurrent.atomic.AtomicInteger; |
| |
| /** |
| * Created by Maxim.Mossienko on 7/18/13. |
| */ |
| class TaskQueue { |
| private final AtomicInteger myDoWorkRequest = new AtomicInteger(); |
| private final AtomicInteger myUpdatesCount = new AtomicInteger(); |
| private final BlockingQueue<Runnable> myPendingWriteRequestsQueue = new LinkedBlockingQueue<Runnable>(); |
| private final BlockingQueue<Runnable> myTimestampUpdates = new LinkedBlockingQueue<Runnable>(); |
| private final int myLimit; |
| private final int myStealLimit; |
| private final int myTimeStampUpdateSizeLimit; |
| |
| public TaskQueue(int limit) { |
| myLimit = limit; |
| myStealLimit = Math.max(1, (int)(limit * 0.01)); |
| myTimeStampUpdateSizeLimit = 32; |
| } |
| |
| void submit(@NotNull final Computable<Boolean> update, @NotNull final Runnable successRunnable) { |
| int currentTasksCount = myUpdatesCount.incrementAndGet(); |
| |
| myPendingWriteRequestsQueue.add(new Runnable() { |
| @Override |
| public void run() { |
| try { |
| Boolean result = update.compute(); |
| if (result == Boolean.TRUE) { |
| myTimestampUpdates.add(successRunnable); |
| } |
| } |
| finally { |
| myUpdatesCount.decrementAndGet(); |
| } |
| } |
| }); |
| |
| if (currentTasksCount > myLimit) { |
| Runnable runnable = myPendingWriteRequestsQueue.poll(); |
| int processed = 0; |
| while (runnable != null) { |
| runnable.run(); |
| if (++processed == myStealLimit) break; |
| runnable = myPendingWriteRequestsQueue.poll(); |
| } |
| } |
| |
| int size = myTimestampUpdates.size(); |
| if (size > myTimeStampUpdateSizeLimit) { |
| applyTimeStamps(size); |
| } |
| } |
| |
| private void applyTimeStamps(final int max) { |
| final Runnable runnable = myTimestampUpdates.poll(); |
| if (runnable == null) return; |
| ApplicationManager.getApplication().runReadAction(new Runnable() { |
| @Override |
| public void run() { |
| int updates = 0; |
| for (Runnable r = runnable; r != null; r = myTimestampUpdates.poll()) { |
| r.run(); |
| if (++updates == max) break; |
| } |
| } |
| }); |
| } |
| |
| public void ensureUpToDate() { |
| try { |
| while(myUpdatesCount.get() > 0) { |
| Runnable runnable = myPendingWriteRequestsQueue.poll(10, TimeUnit.MILLISECONDS); |
| if (runnable != null) runnable.run(); |
| } |
| applyTimeStamps(Integer.MAX_VALUE); |
| } |
| catch (InterruptedException e) { |
| throw new RuntimeException(e); |
| } |
| } |
| |
| public void signalUpdateEnd() { |
| myDoWorkRequest.decrementAndGet(); |
| } |
| |
| public void signalUpdateStart() { |
| int workRequests = myDoWorkRequest.getAndIncrement(); |
| |
| if (workRequests == 0) { |
| myDoWorkRequest.incrementAndGet(); |
| // we have 3 content independent indices but only one of them is heavy IO bound so there is no need in more than one thread |
| ApplicationManager.getApplication().executeOnPooledThread(new Runnable() { |
| @Override |
| public void run() { |
| try { |
| while(true) { |
| Runnable runnable = myPendingWriteRequestsQueue.poll(2000, TimeUnit.MILLISECONDS); |
| if (runnable != null) { |
| runnable.run(); |
| } else { |
| // we have no work for 2s and there is no currently running updates |
| if(myDoWorkRequest.compareAndSet(1, 0)) { |
| break; |
| } |
| } |
| } |
| } |
| catch (InterruptedException ignore) {} |
| } |
| }); |
| } |
| } |
| } |