Mercurial > hg > truffle
view truffle/com.oracle.truffle.api.vm/src/com/oracle/truffle/api/vm/ComputeInExecutor.java @ 22350:b1c71f0c1a85
Unifying the executor access into single ComputeInExecutor class and removing the need for CountDownLatch
author | Jaroslav Tulach <jaroslav.tulach@oracle.com> |
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date | Thu, 05 Nov 2015 18:42:36 +0100 |
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/* * Copyright (c) 2014, 2015, Oracle and/or its affiliates. All rights reserved. * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. * * This code is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License version 2 only, as * published by the Free Software Foundation. Oracle designates this * particular file as subject to the "Classpath" exception as provided * by Oracle in the LICENSE file that accompanied this code. * * This code is distributed in the hope that it will be useful, but WITHOUT * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License * version 2 for more details (a copy is included in the LICENSE file that * accompanied this code). * * You should have received a copy of the GNU General Public License version * 2 along with this work; if not, write to the Free Software Foundation, * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. * * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA * or visit www.oracle.com if you need additional information or have any * questions. */ package com.oracle.truffle.api.vm; import java.io.IOException; import java.io.InterruptedIOException; import java.util.concurrent.Executor; abstract class ComputeInExecutor<R> implements Runnable { private final Executor executor; private R result; private Throwable exception; private boolean started; private boolean done; protected ComputeInExecutor(Executor executor) { this.executor = executor; } protected abstract R compute() throws IOException; public final R get() throws IOException { perform(); if (executor != null) { waitForDone(); } exceptionCheck(); return result; } private void waitForDone() throws InterruptedIOException { synchronized (this) { while (!done) { try { wait(); } catch (InterruptedException ex) { throw new InterruptedIOException(ex.getMessage()); } } } } private void exceptionCheck() throws IOException, RuntimeException { if (exception instanceof IOException) { throw (IOException) exception; } if (exception instanceof RuntimeException) { throw (RuntimeException) exception; } if (exception != null) { throw new RuntimeException(exception); } } public final void perform() throws IOException { if (started) { return; } started = true; if (executor == null) { run(); } else { executor.execute(this); } exceptionCheck(); } @Override public final void run() { try { result = compute(); } catch (Exception ex) { exception = ex; } finally { if (executor != null) { synchronized (this) { done = true; notifyAll(); } } else { done = true; } } } @Override public final String toString() { return "value=" + result + ",exception=" + exception + ",computed=" + done; } }