| Clover coverage report - PLT Utilities Test Coverage (plt-20120304-r5436) |
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| Source file | Conditionals | Statements | Methods | TOTAL | |||||||||||||||
| ExecutorTaskController.java | 25% | 68.4% | 80% | 64.3% |
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| 1 | /*BEGIN_COPYRIGHT_BLOCK* | |
| 2 | ||
| 3 | PLT Utilities BSD License | |
| 4 | ||
| 5 | Copyright (c) 2007-2010 JavaPLT group at Rice University | |
| 6 | All rights reserved. | |
| 7 | ||
| 8 | Developed by: Java Programming Languages Team | |
| 9 | Rice University | |
| 10 | http://www.cs.rice.edu/~javaplt/ | |
| 11 | ||
| 12 | Redistribution and use in source and binary forms, with or without modification, are permitted | |
| 13 | provided that the following conditions are met: | |
| 14 | ||
| 15 | - Redistributions of source code must retain the above copyright notice, this list of conditions | |
| 16 | and the following disclaimer. | |
| 17 | - Redistributions in binary form must reproduce the above copyright notice, this list of | |
| 18 | conditions and the following disclaimer in the documentation and/or other materials provided | |
| 19 | with the distribution. | |
| 20 | - Neither the name of the JavaPLT group, Rice University, nor the names of the library's | |
| 21 | contributors may be used to endorse or promote products derived from this software without | |
| 22 | specific prior written permission. | |
| 23 | ||
| 24 | THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR | |
| 25 | IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND | |
| 26 | FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDERS AND | |
| 27 | CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL | |
| 28 | DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, | |
| 29 | DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER | |
| 30 | IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT | |
| 31 | OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | |
| 32 | ||
| 33 | *END_COPYRIGHT_BLOCK*/ | |
| 34 | ||
| 35 | package edu.rice.cs.plt.concurrent; | |
| 36 | ||
| 37 | import java.util.concurrent.Executor; | |
| 38 | ||
| 39 | import edu.rice.cs.plt.lambda.Thunk; | |
| 40 | import edu.rice.cs.plt.lambda.WrappedException; | |
| 41 | ||
| 42 | /** | |
| 43 | * A TaskController for a simple task, which is scheduled for execution by an Executor. To support | |
| 44 | * canceling, the task should respond to an interrupt by throwing an {@link InterruptedException}, wrapped by a | |
| 45 | * {@link WrappedException}. The task is submitted (via {@link Executor#execute}) when {@code start()} is | |
| 46 | * invoked (if the executor blocks, so will {@code start()}); its status is changed to "running" when it | |
| 47 | * actually begins executing; if canceled in the interim, the status will still be "paused" until the | |
| 48 | * task begins its scheduled execution. | |
| 49 | */ | |
| 50 | public class ExecutorTaskController<R> extends TaskController<R> { | |
| 51 | // fields will be changed to null by discard(), but no need for volatile because it's only for garbage collection | |
| 52 | private Executor _executor; | |
| 53 | private Thunk<? extends R> _task; | |
| 54 | // must be volatile because it starts uninitialized | |
| 55 | private volatile Thread _t; | |
| 56 | ||
| 57 | 3 | public ExecutorTaskController(Executor executor, Thunk<? extends R> task) { |
| 58 | 3 | _executor = executor; |
| 59 | 3 | _task = task; |
| 60 | 3 | _t = null; // initialized immediately before started() is called |
| 61 | } | |
| 62 | ||
| 63 | 3 | protected void doStart() { |
| 64 | 3 | _executor.execute(new Runnable() { |
| 65 | 3 | public void run() { |
| 66 | 3 | _t = Thread.currentThread(); |
| 67 | 3 | started(); |
| 68 | 3 | try { |
| 69 | // stop if the task was canceled before execution began | |
| 70 | 0 | if (Thread.interrupted()) { throw new InterruptedException(); } |
| 71 | 3 | finishedCleanly(_task.value()); |
| 72 | } | |
| 73 | 0 | catch (InterruptedException e) { stopped(); } |
| 74 | catch (WrappedException e) { | |
| 75 | 0 | if (e.getCause() instanceof InterruptedException) { stopped(); } |
| 76 | 0 | else { finishedWithTaskException(e); } |
| 77 | } | |
| 78 | 1 | catch (RuntimeException e) { finishedWithTaskException(e); } |
| 79 | } | |
| 80 | }); | |
| 81 | } | |
| 82 | ||
| 83 | 0 | protected void doStop() { _t.interrupt(); } |
| 84 | 3 | protected void discard() { _executor = null; _task = null; _t = null; } |
| 85 | } |
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