PooledSjavac.java revision 3356:b99518745035 
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.  Oracle designates this
8 * particular file as subject to the "Classpath" exception as provided
9 * by Oracle in the LICENSE file that accompanied this code.
10 *
11 * This code is distributed in the hope that it will be useful, but WITHOUT
12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
14 * version 2 for more details (a copy is included in the LICENSE file that
15 * accompanied this code).
16 *
17 * You should have received a copy of the GNU General Public License version
18 * 2 along with this work; if not, write to the Free Software Foundation,
19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
20 *
21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
22 * or visit www.oracle.com if you need additional information or have any
23 * questions.
24 */
25
26package com.sun.tools.sjavac.comp;
27
28import com.sun.tools.javac.main.Main.Result;
29import com.sun.tools.sjavac.Log;
30import com.sun.tools.sjavac.server.Sjavac;
31
32import java.util.Objects;
33import java.util.concurrent.ExecutorService;
34import java.util.concurrent.Executors;
35import java.util.concurrent.TimeUnit;
36
37/**
38 * An sjavac implementation that limits the number of concurrent calls by
39 * wrapping invocations in Callables and delegating them to a FixedThreadPool.
40 *
41 *  <p><b>This is NOT part of any supported API.
42 *  If you write code that depends on this, you do so at your own risk.
43 *  This code and its internal interfaces are subject to change or
44 *  deletion without notice.</b>
45 */
46public class PooledSjavac implements Sjavac {
47
48    final Sjavac delegate;
49    final ExecutorService pool;
50
51    public PooledSjavac(Sjavac delegate, int poolsize) {
52        Objects.requireNonNull(delegate);
53        this.delegate = delegate;
54        pool = Executors.newFixedThreadPool(poolsize);
55    }
56
57    @Override
58    public Result compile(String[] args) {
59        Log log = Log.get();
60        try {
61            return pool.submit(() -> {
62                Log.setLogForCurrentThread(log);
63                return delegate.compile(args);
64            }).get();
65        } catch (Exception e) {
66            e.printStackTrace();
67            throw new RuntimeException("Error during compile", e);
68        }
69    }
70
71    @Override
72    public void shutdown() {
73        Log.debug("Shutting down PooledSjavac");
74        pool.shutdown(); // Disable new tasks from being submitted
75        try {
76            // Wait a while for existing tasks to terminate
77            if (!pool.awaitTermination(60, TimeUnit.SECONDS)) {
78                pool.shutdownNow(); // Cancel currently executing tasks
79                // Wait a while for tasks to respond to being cancelled
80                if (!pool.awaitTermination(60, TimeUnit.SECONDS))
81                    Log.error("ThreadPool did not terminate");
82            }
83        } catch (InterruptedException ie) {
84          // (Re-)Cancel if current thread also interrupted
85          pool.shutdownNow();
86          // Preserve interrupt status
87          Thread.currentThread().interrupt();
88        }
89
90        delegate.shutdown();
91    }
92
93}
94