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annotate truffle/com.oracle.truffle.api.vm/src/com/oracle/truffle/api/vm/ComputeInExecutor.java @ 22350:b1c71f0c1a85

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Unifying the executor access into single ComputeInExecutor class and removing the need for CountDownLatch
author Jaroslav Tulach <jaroslav.tulach@oracle.com>
date Thu, 05 Nov 2015 18:42:36 +0100
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b1c71f0c1a85 Unifying the executor access into single ComputeInExecutor class and removing the need for CountDownLatch
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1 /*
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2 * Copyright (c) 2014, 2015, 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.oracle.truffle.api.vm;
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26
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27 import java.io.IOException;
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28 import java.io.InterruptedIOException;
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29 import java.util.concurrent.Executor;
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30
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31 abstract class ComputeInExecutor<R> implements Runnable {
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32 private final Executor executor;
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33 private R result;
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34 private Throwable exception;
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35 private boolean started;
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36 private boolean done;
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37
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38 protected ComputeInExecutor(Executor executor) {
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39 this.executor = executor;
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40 }
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41
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42 protected abstract R compute() throws IOException;
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43
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44 public final R get() throws IOException {
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45 perform();
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46 if (executor != null) {
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47 waitForDone();
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48 }
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49 exceptionCheck();
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50 return result;
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51 }
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52
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53 private void waitForDone() throws InterruptedIOException {
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54 synchronized (this) {
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55 while (!done) {
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56 try {
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57 wait();
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58 } catch (InterruptedException ex) {
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59 throw new InterruptedIOException(ex.getMessage());
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60 }
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61 }
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62 }
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63 }
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64
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65 private void exceptionCheck() throws IOException, RuntimeException {
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66 if (exception instanceof IOException) {
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67 throw (IOException) exception;
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68 }
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69 if (exception instanceof RuntimeException) {
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70 throw (RuntimeException) exception;
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71 }
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72 if (exception != null) {
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73 throw new RuntimeException(exception);
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74 }
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75 }
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76
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77 public final void perform() throws IOException {
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78 if (started) {
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79 return;
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80 }
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81 started = true;
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82 if (executor == null) {
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83 run();
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84 } else {
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85 executor.execute(this);
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86 }
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87 exceptionCheck();
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88 }
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89
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90 @Override
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91 public final void run() {
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92 try {
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93 result = compute();
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94 } catch (Exception ex) {
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95 exception = ex;
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96 } finally {
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97 if (executor != null) {
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98 synchronized (this) {
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99 done = true;
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100 notifyAll();
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101 }
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102 } else {
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103 done = true;
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104 }
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105 }
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106 }
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107
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108 @Override
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109 public final String toString() {
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110 return "value=" + result + ",exception=" + exception + ",computed=" + done;
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111 }
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112 }