| Clover coverage report - PLT Utilities Test Coverage (plt-20120304-r5436) |
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| Source file | Conditionals | Statements | Methods | TOTAL | |||||||||||||||
| FutureTaskController.java | 0% | 0% | 0% | 0% |
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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.CancellationException; | |
| 38 | import java.util.concurrent.ExecutionException; | |
| 39 | import java.util.concurrent.Future; | |
| 40 | import java.util.concurrent.TimeUnit; | |
| 41 | import java.util.concurrent.TimeoutException; | |
| 42 | ||
| 43 | import edu.rice.cs.plt.lambda.Thunk; | |
| 44 | import edu.rice.cs.plt.lambda.WrappedException; | |
| 45 | ||
| 46 | /** | |
| 47 | * Treats an arbitrary Future-producing computation as a TaskController. The task is considered "started" | |
| 48 | * once the future has been created via {@link #start()} (even though some futures are not scheduled | |
| 49 | * for immediate execution — the API provides no means for determining whether a task is | |
| 50 | * actually running). | |
| 51 | */ | |
| 52 | public class FutureTaskController<T> extends PollingTaskController<T> { | |
| 53 | // fields are made null on discard; _future is initially null, too | |
| 54 | private volatile Thunk<? extends Future<? extends T>> _futureThunk; | |
| 55 | private volatile Future<? extends T> _future; | |
| 56 | ||
| 57 | 0 | public FutureTaskController(Thunk<? extends Future<? extends T>> futureThunk) { |
| 58 | 0 | _futureThunk = futureThunk; |
| 59 | 0 | _future = null; |
| 60 | } | |
| 61 | ||
| 62 | 0 | protected void doStart() { _future = _futureThunk.value(); started(); } |
| 63 | 0 | protected void doStop() { _future.cancel(true); } |
| 64 | 0 | protected void discard() { _futureThunk = null; _future = null; } |
| 65 | ||
| 66 | 0 | protected void update() { |
| 67 | 0 | if (_future.isDone()) { |
| 68 | 0 | if (_future.isCancelled()) { stopped(); } |
| 69 | else { | |
| 70 | 0 | try { finish(); } |
| 71 | catch (InterruptedException e) { /* shouldn't happen -- we're done -- but just ignore. */ } | |
| 72 | } | |
| 73 | } | |
| 74 | } | |
| 75 | ||
| 76 | 0 | protected void finish() throws InterruptedException { |
| 77 | 0 | try { finishedCleanly(_future.get()); } |
| 78 | 0 | catch (CancellationException e) { stopped(); } |
| 79 | 0 | catch (ExecutionException e) { handleExecutionException(e); } |
| 80 | 0 | catch (RuntimeException e) { finishedWithImplementationException(e); } |
| 81 | } | |
| 82 | ||
| 83 | 0 | protected void finish(long timeout, TimeUnit unit) throws InterruptedException, TimeoutException { |
| 84 | 0 | try { finishedCleanly(_future.get(timeout, unit)); } |
| 85 | 0 | catch (CancellationException e) { stopped(); } |
| 86 | 0 | catch (ExecutionException e) { handleExecutionException(e); } |
| 87 | 0 | catch (RuntimeException e) { finishedWithImplementationException(e); } |
| 88 | } | |
| 89 | ||
| 90 | 0 | private void handleExecutionException(ExecutionException e) { |
| 91 | 0 | Throwable cause = e.getCause(); // may be null |
| 92 | 0 | if (cause instanceof Exception) { finishedWithTaskException((Exception) cause); } |
| 93 | 0 | else { finishedWithImplementationException(new WrappedException(e)); } |
| 94 | } | |
| 95 | ||
| 96 | } | |
| 97 | ||
| 98 |
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