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1 /* |
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2 * Copyright (c) 2014, Oracle and/or its affiliates. All rights reserved. |
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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4 * |
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5 * This code is free software; you can redistribute it and/or modify it |
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6 * under the terms of the GNU General Public License version 2 only, as |
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7 * published by the Free Software Foundation. Oracle designates this |
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8 * particular file as subject to the "Classpath" exception as provided |
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9 * by Oracle in the LICENSE file that accompanied this code. |
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10 * |
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11 * This code is distributed in the hope that it will be useful, but WITHOUT |
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12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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14 * version 2 for more details (a copy is included in the LICENSE file that |
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15 * accompanied this code). |
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16 * |
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17 * You should have received a copy of the GNU General Public License version |
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18 * 2 along with this work; if not, write to the Free Software Foundation, |
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19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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20 * |
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21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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22 * or visit www.oracle.com if you need additional information or have any |
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23 * questions. |
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24 */ |
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25 package com.sun.tools.sjavac.comp; |
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26 |
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27 import java.io.File; |
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28 import java.net.URI; |
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29 import java.util.List; |
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30 import java.util.Objects; |
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31 import java.util.Set; |
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32 import java.util.concurrent.Callable; |
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33 import java.util.concurrent.ExecutorService; |
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34 import java.util.concurrent.Executors; |
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35 import java.util.concurrent.ThreadFactory; |
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36 import java.util.concurrent.TimeUnit; |
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37 import java.util.concurrent.atomic.AtomicInteger; |
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38 |
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39 import com.sun.tools.sjavac.Log; |
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40 import com.sun.tools.sjavac.server.CompilationResult; |
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41 import com.sun.tools.sjavac.server.Sjavac; |
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42 import com.sun.tools.sjavac.server.SysInfo; |
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43 |
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44 /** |
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45 * An sjavac implementation that limits the number of concurrent calls by |
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46 * wrapping invocations in Callables and delegating them to a FixedThreadPool. |
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47 * |
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48 * <p><b>This is NOT part of any supported API. |
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49 * If you write code that depends on this, you do so at your own risk. |
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50 * This code and its internal interfaces are subject to change or |
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51 * deletion without notice.</b> |
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52 */ |
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53 public class PooledSjavac implements Sjavac { |
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54 |
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55 final Sjavac delegate; |
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56 final ExecutorService pool; |
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57 |
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58 public PooledSjavac(Sjavac delegate, int poolsize) { |
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59 Objects.requireNonNull(delegate); |
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60 this.delegate = delegate; |
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61 pool = Executors.newFixedThreadPool(poolsize, new ThreadFactory() { |
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62 AtomicInteger count = new AtomicInteger(); |
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63 @Override |
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64 public Thread newThread(Runnable runnable) { |
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65 String cls = PooledSjavac.class.getSimpleName(); |
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66 int num = count.incrementAndGet(); |
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67 Thread t = new Thread(runnable, cls + "-" + num); |
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68 t.setDaemon(true); |
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69 return t; |
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70 } |
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71 }); |
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72 } |
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73 |
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74 @Override |
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75 public SysInfo getSysInfo() { |
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76 try { |
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77 return pool.submit(new Callable<SysInfo>() { |
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78 @Override |
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79 public SysInfo call() throws Exception { |
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80 return delegate.getSysInfo(); |
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81 } |
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82 }).get(); |
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83 } catch (Exception e) { |
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84 e.printStackTrace(); |
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85 throw new RuntimeException("Error during getSysInfo", e); |
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86 } |
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87 } |
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88 |
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89 @Override |
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90 public CompilationResult compile(final String protocolId, |
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91 final String invocationId, |
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92 final String[] args, |
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93 final List<File> explicitSources, |
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94 final Set<URI> sourcesToCompile, |
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95 final Set<URI> visibleSources) { |
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96 try { |
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97 return pool.submit(new Callable<CompilationResult>() { |
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98 @Override |
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99 public CompilationResult call() throws Exception { |
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100 return delegate.compile(protocolId, |
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101 invocationId, |
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102 args, |
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103 explicitSources, |
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104 sourcesToCompile, |
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105 visibleSources); |
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106 } |
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107 }).get(); |
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108 } catch (Exception e) { |
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109 e.printStackTrace(); |
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110 throw new RuntimeException("Error during compile", e); |
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111 } |
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112 } |
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113 |
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114 @Override |
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115 public void shutdown() { |
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116 pool.shutdown(); // Disable new tasks from being submitted |
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117 try { |
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118 // Wait a while for existing tasks to terminate |
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119 if (!pool.awaitTermination(60, TimeUnit.SECONDS)) { |
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120 pool.shutdownNow(); // Cancel currently executing tasks |
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121 // Wait a while for tasks to respond to being cancelled |
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122 if (!pool.awaitTermination(60, TimeUnit.SECONDS)) |
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123 Log.error("ThreadPool did not terminate"); |
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124 } |
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125 // Grace period for thread termination |
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126 Thread.sleep(1000); |
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127 } catch (InterruptedException ie) { |
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128 // (Re-)Cancel if current thread also interrupted |
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129 pool.shutdownNow(); |
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130 // Preserve interrupt status |
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131 Thread.currentThread().interrupt(); |
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132 } |
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133 |
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134 delegate.shutdown(); |
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135 } |
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136 |
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137 @Override |
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138 public String serverSettings() { |
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139 return delegate.serverSettings(); |
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140 } |
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141 } |