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Merge pull request #670 from matthiasblaesing/simple_com_thread
Reintroduce ComThread and move base functions into ObjectFactory
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contrib/platform/src/com/sun/jna/platform/win32/COM/util/ComThread.java
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| /* Copyright (c) 2014 Dr David H. Akehurst (itemis), All Rights Reserved | ||
| * | ||
| * This library is free software; you can redistribute it and/or | ||
| * modify it under the terms of the GNU Lesser General Public | ||
| * License as published by the Free Software Foundation; either | ||
| * version 2.1 of the License, or (at your option) any later version. | ||
| * | ||
| * This library 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 | ||
| * Lesser General Public License for more details. | ||
| */ | ||
| package com.sun.jna.platform.win32.COM.util; | ||
|
|
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| import java.lang.Thread.UncaughtExceptionHandler; | ||
| import java.util.concurrent.Callable; | ||
| import java.util.concurrent.ExecutionException; | ||
| import java.util.concurrent.ExecutorService; | ||
| import java.util.concurrent.Executors; | ||
| import java.util.concurrent.ThreadFactory; | ||
| import java.util.concurrent.TimeUnit; | ||
| import java.util.concurrent.TimeoutException; | ||
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|
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| import com.sun.jna.platform.win32.Ole32; | ||
| import com.sun.jna.platform.win32.WinNT; | ||
| import com.sun.jna.platform.win32.COM.COMUtils; | ||
|
|
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| public class ComThread { | ||
| private static ThreadLocal<Boolean> isCOMThread = new ThreadLocal<Boolean>(); | ||
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| ExecutorService executor; | ||
| Runnable firstTask; | ||
| boolean requiresInitialisation; | ||
| long timeoutMilliseconds; | ||
| UncaughtExceptionHandler uncaughtExceptionHandler; | ||
|
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| public ComThread(final String threadName, long timeoutMilliseconds, UncaughtExceptionHandler uncaughtExceptionHandler) { | ||
| this(threadName, timeoutMilliseconds, uncaughtExceptionHandler, Ole32.COINIT_MULTITHREADED); | ||
| } | ||
|
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| public ComThread(final String threadName, long timeoutMilliseconds, UncaughtExceptionHandler uncaughtExceptionHandler, final int coinitialiseExFlag) { | ||
| this.requiresInitialisation = true; | ||
| this.timeoutMilliseconds = timeoutMilliseconds; | ||
| this.uncaughtExceptionHandler = uncaughtExceptionHandler; | ||
| this.firstTask = new Runnable() { | ||
| @Override | ||
| public void run() { | ||
| try { | ||
| //If we do not use COINIT_MULTITHREADED, it is necessary to have | ||
| // a message loop see - | ||
| // [http://www.codeguru.com/cpp/com-tech/activex/apts/article.php/c5529/Understanding-COM-Apartments-Part-I.htm] | ||
| // [http://www.codeguru.com/cpp/com-tech/activex/apts/article.php/c5533/Understanding-COM-Apartments-Part-II.htm] | ||
| WinNT.HRESULT hr = Ole32.INSTANCE.CoInitializeEx(null, coinitialiseExFlag); | ||
| isCOMThread.set(true); | ||
| COMUtils.checkRC(hr); | ||
| ComThread.this.requiresInitialisation = false; | ||
| } catch (Throwable t) { | ||
| ComThread.this.uncaughtExceptionHandler.uncaughtException(Thread.currentThread(), t); | ||
| } | ||
| } | ||
| }; | ||
| executor = Executors.newSingleThreadExecutor(new ThreadFactory() { | ||
|
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| @Override | ||
| public Thread newThread(Runnable r) { | ||
| if (!ComThread.this.requiresInitialisation) { | ||
| // something has gone wrong! | ||
| throw new RuntimeException("ComThread executor has a problem."); | ||
| } | ||
| Thread thread = new Thread(r, threadName); | ||
| //make sure this is a daemon thread, or it will stop JVM existing | ||
| // if program does not call terminate(); | ||
| thread.setDaemon(true); | ||
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| thread.setUncaughtExceptionHandler(new UncaughtExceptionHandler() { | ||
| @Override | ||
| public void uncaughtException(Thread t, Throwable e) { | ||
| ComThread.this.requiresInitialisation = true; | ||
| ComThread.this.uncaughtExceptionHandler.uncaughtException(t, e); | ||
| } | ||
| }); | ||
|
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| return thread; | ||
| } | ||
| }); | ||
|
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| } | ||
|
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| /** | ||
| * Stop the COM Thread. | ||
| * | ||
| * @param timeoutMilliseconds | ||
| * number of milliseconds to wait for a clean shutdown before a | ||
| * forced shutdown is attempted | ||
| */ | ||
| public void terminate(long timeoutMilliseconds) { | ||
| try { | ||
|
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| executor.submit(new Runnable() { | ||
| @Override | ||
| public void run() { | ||
| Ole32.INSTANCE.CoUninitialize(); | ||
| } | ||
| }).get(timeoutMilliseconds, TimeUnit.MILLISECONDS); | ||
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| executor.shutdown(); | ||
|
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| } catch (InterruptedException e) { | ||
| e.printStackTrace(); | ||
| } catch (ExecutionException e) { | ||
| e.printStackTrace(); | ||
| } catch (TimeoutException e) { | ||
| executor.shutdownNow(); | ||
| } | ||
| } | ||
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| @Override | ||
| protected void finalize() throws Throwable { | ||
| if (!executor.isShutdown()) { | ||
| this.terminate(100); | ||
| } | ||
| } | ||
|
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| static void setComThread(boolean value) { | ||
| isCOMThread.set(value); | ||
| } | ||
|
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| public <T> T execute(Callable<T> task) throws TimeoutException, InterruptedException, ExecutionException { | ||
| // If the call is done on a COM thread, invoke directly | ||
| // if the call comes from outside the invokation is dispatched | ||
| // into the Dispatch Thread. | ||
| Boolean comThread = isCOMThread.get(); | ||
| if(comThread == null) { | ||
| comThread = false; | ||
| } | ||
| if(comThread) { | ||
| try { | ||
| return task.call(); | ||
| } catch (Exception ex) { | ||
| throw new ExecutionException(ex); | ||
| } | ||
| } else { | ||
| if (this.requiresInitialisation) { | ||
| executor.execute(firstTask); | ||
| } | ||
| return executor.submit(task).get(this.timeoutMilliseconds, TimeUnit.MILLISECONDS); | ||
| } | ||
| } | ||
|
|
||
| } |
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