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/*******************************************************************************
* Copyright (c) 2000, 2006 IBM Corporation and others.
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html
*
* Contributors:
* IBM Corporation - initial API and implementation
*******************************************************************************/
package org.eclipse.cdt.internal.ui.util;
import java.lang.reflect.InvocationTargetException;
import org.eclipse.swt.custom.BusyIndicator;
import org.eclipse.core.runtime.NullProgressMonitor;
import org.eclipse.core.runtime.OperationCanceledException;
import org.eclipse.jface.operation.IRunnableContext;
import org.eclipse.jface.operation.IRunnableWithProgress;
import org.eclipse.jface.operation.ModalContext;
/**
* A runnable context that shows the busy cursor instead of a progress
* monitor. Note, that the UI thread is blocked even if the runnable
* is executed in a separate thread by passing <code>fork= true</code>
* to the context's run method. Furthermore this context doesn't provide
* any UI to cancel the operation.
*/
public class BusyIndicatorRunnableContext implements IRunnableContext {
private static class BusyRunnable implements Runnable {
private static class ThreadContext extends Thread {
IRunnableWithProgress fRunnable;
Throwable fThrowable;
public ThreadContext(IRunnableWithProgress runnable) {
this(runnable, "BusyCursorRunnableContext-Thread"); //$NON-NLS-1$
}
protected ThreadContext(IRunnableWithProgress runnable, String name) {
super(name);
fRunnable= runnable;
}
public void run() {
try {
fRunnable.run(new NullProgressMonitor());
} catch (InvocationTargetException e) {
fThrowable= e;
} catch (InterruptedException e) {
fThrowable= e;
} catch (ThreadDeath e) {
fThrowable= e;
throw e;
} catch (RuntimeException e) {
fThrowable= e;
} catch (Error e) {
fThrowable= e;
}
}
void sync() {
try {
join();
} catch (InterruptedException e) {
// ok to ignore exception
}
}
}
public Throwable fThrowable;
private boolean fFork;
private IRunnableWithProgress fRunnable;
public BusyRunnable(boolean fork, IRunnableWithProgress runnable) {
fFork= fork;
fRunnable= runnable;
}
public void run() {
try {
internalRun(fFork, fRunnable);
} catch (InvocationTargetException e) {
fThrowable= e;
} catch (InterruptedException e) {
fThrowable= e;
}
}
private void internalRun(boolean fork, final IRunnableWithProgress runnable) throws InvocationTargetException, InterruptedException {
Thread thread= Thread.currentThread();
// Do not spawn another thread if we are already in a modal context
// thread or inside a busy context thread.
if (thread instanceof ThreadContext || ModalContext.isModalContextThread(thread))
fork= false;
if (fork) {
final ThreadContext t= new ThreadContext(runnable);
t.start();
t.sync();
// Check if the separate thread was terminated by an exception
Throwable throwable= t.fThrowable;
if (throwable != null) {
if (throwable instanceof InvocationTargetException) {
throw (InvocationTargetException) throwable;
} else if (throwable instanceof InterruptedException) {
throw (InterruptedException) throwable;
} else if (throwable instanceof OperationCanceledException) {
throw new InterruptedException();
} else {
throw new InvocationTargetException(throwable);
}
}
} else {
try {
runnable.run(new NullProgressMonitor());
} catch (OperationCanceledException e) {
throw new InterruptedException();
}
}
}
}
/* (non-Javadoc)
* Method declared on IRunnableContext.
*/
public void run(boolean fork, boolean cancelable, IRunnableWithProgress runnable) throws InvocationTargetException, InterruptedException {
BusyRunnable busyRunnable= new BusyRunnable(fork, runnable);
BusyIndicator.showWhile(null, busyRunnable);
Throwable throwable= busyRunnable.fThrowable;
if (throwable instanceof InvocationTargetException) {
throw (InvocationTargetException)throwable;
} else if (throwable instanceof InterruptedException) {
throw (InterruptedException)throwable;
}
}
}
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