PooledExecution.java revision 3022:5ba1a29a0eb0 
1/*
2 * Copyright (c) 2014, 2015, 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.sjavac.comp
29 *          jdk.compiler/com.sun.tools.sjavac.server
30 * @build Wrapper
31 * @run main Wrapper PooledExecution
32 */
33import java.io.Writer;
34import java.util.concurrent.CountDownLatch;
35import java.util.concurrent.atomic.AtomicInteger;
36
37import com.sun.tools.sjavac.comp.PooledSjavac;
38import com.sun.tools.sjavac.server.Sjavac;
39
40
41public class PooledExecution {
42
43    public static void main(String[] args) throws InterruptedException {
44        new PooledExecutionTest().runTest();
45    }
46
47    static class PooledExecutionTest {
48
49        final int POOL_SIZE = 15;
50        final int NUM_REQUESTS = 100;
51
52        // Number of tasks that has not yet started
53        CountDownLatch leftToStart = new CountDownLatch(NUM_REQUESTS);
54
55        // Highest number of concurrently active request seen
56        int highWaterMark = 0;
57
58        public void runTest() throws InterruptedException {
59            ConcurrencyLoggingService loggingService = new ConcurrencyLoggingService();
60            final Sjavac service = new PooledSjavac(loggingService, POOL_SIZE);
61
62            // Keep track of the number of finished tasks so we can make sure all
63            // tasks finishes gracefully upon shutdown.
64            Thread[] tasks = new Thread[NUM_REQUESTS];
65            final AtomicInteger tasksFinished = new AtomicInteger(0);
66
67            for (int i = 0; i < NUM_REQUESTS; i++) {
68                tasks[i] = new Thread() {
69                    public void run() {
70                        service.compile(new String[0], null, null);
71                        tasksFinished.incrementAndGet();
72                    }
73                };
74                tasks[i].start();
75            }
76
77            // Wait for all tasks to start (but not necessarily run to completion)
78            leftToStart.await();
79
80            // Shutdown before all tasks are completed
81            System.out.println("Shutting down!");
82            service.shutdown();
83
84            // Wait for all tasks to complete
85            for (Thread t : tasks)
86                t.join();
87
88            if (tasksFinished.get() != NUM_REQUESTS) {
89                throw new AssertionError(tasksFinished.get() + " out of " +
90                        NUM_REQUESTS + " finished. Broken shutdown?");
91            }
92
93            if (highWaterMark > POOL_SIZE) {
94                throw new AssertionError("Pool size overused: " + highWaterMark +
95                                         " used out of " + POOL_SIZE + " allowed.");
96            }
97
98            // Assuming more than POOL_SIZE requests can be processed within 1 sek:
99            if (highWaterMark < POOL_SIZE) {
100                throw new AssertionError("Pool size underused: " + highWaterMark +
101                                         " used out of " + POOL_SIZE + " allowed.");
102            }
103        }
104
105
106        private class ConcurrencyLoggingService implements Sjavac {
107
108            // Keeps track of currently active requests
109            AtomicInteger activeRequests = new AtomicInteger(0);
110
111            @Override
112            public int compile(String[] args, Writer out, Writer err) {
113                leftToStart.countDown();
114                int numActiveRequests = activeRequests.incrementAndGet();
115                System.out.printf("Left to start: %2d / Currently active: %2d%n",
116                                  leftToStart.getCount(),
117                                  numActiveRequests);
118                highWaterMark = Math.max(highWaterMark, numActiveRequests);
119                try {
120                    Thread.sleep(1000);
121                } catch (InterruptedException ie) {
122                    throw new RuntimeException("Interrupted", ie);
123                }
124                activeRequests.decrementAndGet();
125                System.out.println("Task completed");
126                return 0;
127            }
128
129            @Override
130            public void shutdown() {
131            }
132        }
133    }
134}
135