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/*******************************************************************************
* Copyright (c) 2007, 2016 Wind River Systems 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:
* Wind River Systems - initial API and implementation
*******************************************************************************/
package org.eclipse.cdt.dsf.concurrent;
import java.util.concurrent.Executor;
import org.eclipse.cdt.dsf.internal.DsfPlugin;
import org.eclipse.core.runtime.Platform;
/**
* Executor that executes a runnable immediately (synchronously) when it is
* submitted (when {@link #execute(Runnable)} is called). The runnable is
* exercised on the submitter's thread. This executor is useful for clients that
* need to create <code>RequestMonitor</code> objects, but which do not have
* their own executor.
*
* @see RequestMonitor
*
* @since 1.0
*/
public class ImmediateExecutor implements Executor {
/**
* Debug flag used for tracking runnables that were never executed,
* or executed multiple times.
*/
protected static boolean DEBUG_EXECUTOR = false;
static {
DEBUG_EXECUTOR = DsfPlugin.DEBUG && Boolean.parseBoolean(
Platform.getDebugOption("org.eclipse.cdt.dsf/debug/executor")); //$NON-NLS-1$
}
private static ImmediateExecutor fInstance = new ImmediateExecutor();
/**
* The default constructor is hidden. {@link #getInstance()} should be
* used instead.
*/
private ImmediateExecutor() {}
/**
* Returns the singleton instance of ImmediateExecutor.
*/
public static Executor getInstance() {
return fInstance;
}
@Override
public void execute(Runnable command) {
// Check if executable wasn't executed already.
if (DEBUG_EXECUTOR && command instanceof DsfExecutable) {
assert !((DsfExecutable)command).getSubmitted() : "Executable was previously executed."; //$NON-NLS-1$
((DsfExecutable)command).setSubmitted();
}
command.run();
}
}
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