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/******************************************************************************
.
. This
* program and the accompanying materials are made available under the terms of
* the Eclipse Public License 2.0 which accompanies this distribution, and is
t https://www.eclipse.org/legal/epl-2.0/
t
t SPDX-License-Identifier: EPL-2.0
*
* Contributors:
* Composent, Inc. - initial API and implementation
******************************************************************************/
package org.eclipse.equinox.concurrent.future;
import org.eclipse.core.runtime.Assert;
import org.eclipse.core.runtime.IProgressMonitor;
import org.eclipse.core.runtime.ISafeRunnable;
import org.eclipse.core.runtime.NullProgressMonitor;
import org.eclipse.core.runtime.SafeRunner;
/**
* <p>
* Listenable future implementation for a single operation.
* </p>
* <p>
* Subclasses may be created if desired. Note that if subclasses are created,
* that they should/must be very careful with respect to overriding the
* synchronized methods in this class.
* </p>
* @since 1.1
*/
public class SingleOperationListenableFuture<ResultType> extends
SingleOperationFuture<ResultType> implements
IListenableFuture<ResultType> {
private IProgressRunnable<ResultType> progressRunnable;
private IProgressMonitor progressMonitor;
private IExecutor listenerExecutor;
public SingleOperationListenableFuture() {
super();
}
public SingleOperationListenableFuture(IProgressMonitor progressMonitor) {
super(progressMonitor);
}
public void addListener(IExecutor executor,
IProgressRunnable<ResultType> progressRunnable,
IProgressMonitor monitor) {
Assert.isNotNull(executor);
Assert.isNotNull(progressRunnable);
synchronized (this) {
if (this.progressRunnable == null) {
this.progressRunnable = progressRunnable;
this.progressMonitor = monitor;
this.listenerExecutor = executor;
// Now, if we're already done, then execute the listenable now
if (isDone())
execListenable();
}
}
}
@Override
public void runWithProgress(final IProgressRunnable<?> runnable) {
Assert.isNotNull(runnable);
if (!isCanceled()) {
SafeRunner.run(new ISafeRunnable() {
public void handleException(Throwable exception) {
synchronized (SingleOperationListenableFuture.this) {
if (!isCanceled())
setException(exception);
execListenable();
}
}
public void run() throws Exception {
@SuppressWarnings("unchecked")
ResultType result = (ResultType) runnable
.run(getProgressMonitor());
synchronized (SingleOperationListenableFuture.this) {
if (!isCanceled())
set(result);
execListenable();
}
}
});
}
}
private void execListenable() {
// If no progressRunnable has been set, then we simply return
if (progressRunnable == null || listenerExecutor == null)
return;
// Make sure that the progress monitor is set to non-null
if (progressMonitor == null)
progressMonitor = new NullProgressMonitor();
// then we execute using executor
this.listenerExecutor.execute(progressRunnable, progressMonitor);
}
}
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