| /* |
| * Licensed to the Apache Software Foundation (ASF) under one or more |
| * contributor license agreements. See the NOTICE file distributed with |
| * this work for additional information regarding copyright ownership. |
| * The ASF licenses this file to You 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 org.jclouds.gae.config; |
| |
| import static com.google.common.base.Preconditions.checkNotNull; |
| import static org.jclouds.concurrent.DynamicExecutors.newScalingThreadPool; |
| |
| import java.util.concurrent.ExecutorService; |
| import java.util.concurrent.ThreadFactory; |
| |
| import javax.inject.Named; |
| import javax.inject.Singleton; |
| |
| import org.jclouds.Constants; |
| import org.jclouds.concurrent.config.ConfiguresExecutorService; |
| import org.jclouds.concurrent.config.WithSubmissionTrace; |
| |
| import com.google.appengine.api.ThreadManager; |
| import com.google.apphosting.api.ApiProxy; |
| import com.google.common.annotations.Beta; |
| import com.google.common.base.Supplier; |
| import com.google.common.base.Suppliers; |
| import com.google.common.util.concurrent.ListeningExecutorService; |
| import com.google.common.util.concurrent.MoreExecutors; |
| import com.google.inject.AbstractModule; |
| import com.google.inject.Provides; |
| |
| @Beta |
| @ConfiguresExecutorService |
| public class CurrentRequestExecutorServiceModule extends AbstractModule { |
| |
| private final Supplier<ListeningExecutorService> memoizedCurrentRequestExecutorService; |
| |
| public CurrentRequestExecutorServiceModule() { |
| this(memoizedCurrentRequestExecutorService()); |
| } |
| |
| /** |
| * Used when you are creating multiple contexts in the same app. |
| * |
| * @param memoizedCurrentRequestExecutorService |
| * @see #memoizedCurrentRequestExecutorService |
| */ |
| public CurrentRequestExecutorServiceModule(Supplier<ListeningExecutorService> memoizedCurrentRequestExecutorService) { |
| this.memoizedCurrentRequestExecutorService = memoizedCurrentRequestExecutorService; |
| } |
| |
| /** |
| * Used when you are creating multiple contexts in the same app. |
| * |
| * @param currentRequestExecutorService |
| * @see #currentRequestExecutorService |
| */ |
| public CurrentRequestExecutorServiceModule(ListeningExecutorService currentRequestExecutorService) { |
| this.memoizedCurrentRequestExecutorService = Suppliers.ofInstance(currentRequestExecutorService); |
| } |
| |
| @Override |
| protected void configure() { |
| } |
| |
| public static Supplier<ListeningExecutorService> memoizedCurrentRequestExecutorService() { |
| return Suppliers.memoize(new Supplier<ListeningExecutorService>() { |
| // important that these are lazy bound vs in configure, as GAE may not |
| // quite be initialized, yet! |
| @Override |
| public ListeningExecutorService get() { |
| return currentRequestExecutorService(); |
| } |
| |
| }); |
| |
| } |
| |
| public static ListeningExecutorService currentRequestExecutorService() { |
| ThreadFactory factory = checkNotNull(ThreadManager.currentRequestThreadFactory(), |
| "ThreadManager.currentRequestThreadFactory()"); |
| // GAE requests cannot exceed 10 threads per request |
| int maxThreads = 10; |
| long keepAlive = ApiProxy.getCurrentEnvironment().getRemainingMillis(); |
| ExecutorService pool = newScalingThreadPool(0, maxThreads, keepAlive, factory); |
| return WithSubmissionTrace.wrap(MoreExecutors.listeningDecorator(pool)); |
| } |
| |
| @Provides |
| @Singleton |
| @Named(Constants.PROPERTY_USER_THREADS) |
| protected final ListeningExecutorService userExecutor() { |
| return memoizedCurrentRequestExecutorService.get(); |
| } |
| } |