| /* |
| * 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.apache.hyracks.tests.util; |
| |
| import java.util.ArrayList; |
| import java.util.Collections; |
| import java.util.List; |
| import java.util.concurrent.ExecutorService; |
| import java.util.concurrent.Executors; |
| import java.util.concurrent.Semaphore; |
| |
| import org.apache.hyracks.api.comm.IFrame; |
| import org.apache.hyracks.api.comm.IFrameWriter; |
| |
| public class MultiThreadTaskEmulator { |
| |
| private ExecutorService executor; |
| |
| public MultiThreadTaskEmulator() { |
| this.executor = Executors.newCachedThreadPool((r) -> { |
| Thread t = new Thread(r); |
| t.setDaemon(true); |
| return t; |
| }); |
| } |
| |
| public void runInParallel(final IFrameWriter[] writers, final List<IFrame>[] inputFrames) throws Exception { |
| final Semaphore sem = new Semaphore(writers.length - 1); |
| List<Exception> exceptions = Collections.synchronizedList(new ArrayList<>()); |
| for (int i = 1; i < writers.length; i++) { |
| sem.acquire(); |
| final IFrameWriter writer = writers[i]; |
| final List<IFrame> inputFrame = inputFrames[i]; |
| executor.execute(() -> { |
| executeOneWriter(writer, inputFrame, exceptions); |
| sem.release(); |
| }); |
| } |
| |
| final IFrameWriter writer = writers[0]; |
| final List<IFrame> inputFrame = inputFrames[0]; |
| executeOneWriter(writer, inputFrame, exceptions); |
| sem.acquire(writers.length - 1); |
| |
| for (int i = 0; i < exceptions.size(); i++) { |
| exceptions.get(i).printStackTrace(); |
| if (i == exceptions.size() - 1) { |
| throw exceptions.get(i); |
| } |
| } |
| } |
| |
| private void executeOneWriter(IFrameWriter writer, List<IFrame> inputFrame, List<Exception> exceptions) { |
| try { |
| try { |
| writer.open(); |
| for (IFrame frame : inputFrame) { |
| writer.nextFrame(frame.getBuffer()); |
| } |
| } catch (Exception ex) { |
| writer.fail(); |
| throw ex; |
| } finally { |
| writer.close(); |
| } |
| } catch (Exception e) { |
| exceptions.add(e); |
| } |
| } |
| } |