1 /*
   2  * Copyright (c) 2014, 2016, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.
   8  *
   9  * This code is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12  * version 2 for more details (a copy is included in the LICENSE file that
  13  * accompanied this code).
  14  *
  15  * You should have received a copy of the GNU General Public License version
  16  * 2 along with this work; if not, write to the Free Software Foundation,
  17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  18  *
  19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  20  * or visit www.oracle.com if you need additional information or have any
  21  * questions.
  22  */
  23 
  24 /*
  25  * @test
  26  * @bug 8044131
  27  * @summary Makes sure sjavac poolsize option is honored.
  28  * @modules jdk.compiler/com.sun.tools.javac.main
  29  *          jdk.compiler/com.sun.tools.sjavac.comp
  30  *          jdk.compiler/com.sun.tools.sjavac.server
  31  * @build Wrapper
  32  * @run main Wrapper PooledExecution
  33  */
  34 
  35 import java.util.concurrent.CountDownLatch;
  36 import java.util.concurrent.atomic.AtomicInteger;
  37 
  38 import com.sun.tools.javac.main.Main.Result;
  39 import com.sun.tools.sjavac.comp.PooledSjavac;
  40 import com.sun.tools.sjavac.server.Sjavac;
  41 
  42 
  43 public class PooledExecution {
  44 
  45     public static void main(String[] args) throws InterruptedException {
  46         new PooledExecutionTest().runTest();
  47     }
  48 
  49     static class PooledExecutionTest {
  50 
  51         final int POOL_SIZE = 15;
  52         final int NUM_REQUESTS = 100;
  53 
  54         // Number of tasks that has not yet started
  55         CountDownLatch leftToStart = new CountDownLatch(NUM_REQUESTS);
  56 
  57         // Highest number of concurrently active request seen
  58         int highWaterMark = 0;
  59 
  60         public void runTest() throws InterruptedException {
  61             ConcurrencyLoggingService loggingService = new ConcurrencyLoggingService();
  62             final Sjavac service = new PooledSjavac(loggingService, POOL_SIZE);
  63 
  64             // Keep track of the number of finished tasks so we can make sure all
  65             // tasks finishes gracefully upon shutdown.
  66             Thread[] tasks = new Thread[NUM_REQUESTS];
  67             final AtomicInteger tasksFinished = new AtomicInteger(0);
  68 
  69             for (int i = 0; i < NUM_REQUESTS; i++) {
  70                 tasks[i] = new Thread() {
  71                     public void run() {
  72                         service.compile(new String[0]);
  73                         tasksFinished.incrementAndGet();
  74                     }
  75                 };
  76                 tasks[i].start();
  77             }
  78 
  79             // Wait for all tasks to start (but not necessarily run to completion)
  80             leftToStart.await();
  81 
  82             // Shutdown before all tasks are completed
  83             System.out.println("Shutting down!");
  84             service.shutdown();
  85 
  86             // Wait for all tasks to complete
  87             for (Thread t : tasks)
  88                 t.join();
  89 
  90             if (tasksFinished.get() != NUM_REQUESTS) {
  91                 throw new AssertionError(tasksFinished.get() + " out of " +
  92                         NUM_REQUESTS + " finished. Broken shutdown?");
  93             }
  94 
  95             if (highWaterMark > POOL_SIZE) {
  96                 throw new AssertionError("Pool size overused: " + highWaterMark +
  97                                          " used out of " + POOL_SIZE + " allowed.");
  98             }
  99 
 100             // Assuming more than POOL_SIZE requests can be processed within 1 sek:
 101             if (highWaterMark < POOL_SIZE) {
 102                 throw new AssertionError("Pool size underused: " + highWaterMark +
 103                                          " used out of " + POOL_SIZE + " allowed.");
 104             }
 105         }
 106 
 107 
 108         private class ConcurrencyLoggingService implements Sjavac {
 109 
 110             // Keeps track of currently active requests
 111             AtomicInteger activeRequests = new AtomicInteger(0);
 112 
 113             @Override
 114             public Result compile(String[] args) {
 115                 leftToStart.countDown();
 116                 int numActiveRequests = activeRequests.incrementAndGet();
 117                 System.out.printf("Left to start: %2d / Currently active: %2d%n",
 118                                   leftToStart.getCount(),
 119                                   numActiveRequests);
 120                 highWaterMark = Math.max(highWaterMark, numActiveRequests);
 121                 try {
 122                     Thread.sleep(1000);
 123                 } catch (InterruptedException ie) {
 124                     throw new RuntimeException("Interrupted", ie);
 125                 }
 126                 activeRequests.decrementAndGet();
 127                 System.out.println("Task completed");
 128                 return Result.OK;
 129             }
 130 
 131             @Override
 132             public void shutdown() {
 133             }
 134         }
 135     }
 136 }