1 files changed, 101 insertions, 0 deletions
diff --git a/org.eclipse.mylyn.commons.core/src/org/eclipse/mylyn/commons/core/operations/OperationUtil.java b/org.eclipse.mylyn.commons.core/src/org/eclipse/mylyn/commons/core/operations/OperationUtil.java
new file mode 100644
index 00000000..c9bafb24
--- /dev/null
+++ b/org.eclipse.mylyn.commons.core/src/org/eclipse/mylyn/commons/core/operations/OperationUtil.java
@@ -0,0 +1,101 @@
+/*******************************************************************************
+ * Copyright (c) 2010 Tasktop Technologies 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:
+ *     Tasktop Technologies - initial API and implementation
+ *******************************************************************************/
+
+package org.eclipse.mylyn.commons.core.operations;
+
+import java.util.concurrent.CancellationException;
+import java.util.concurrent.ExecutionException;
+import java.util.concurrent.ExecutorService;
+import java.util.concurrent.Future;
+import java.util.concurrent.TimeUnit;
+import java.util.concurrent.TimeoutException;
+
+import org.eclipse.core.runtime.IProgressMonitor;
+import org.eclipse.core.runtime.OperationCanceledException;
+import org.eclipse.core.runtime.SubMonitor;
+import org.eclipse.mylyn.internal.commons.core.CommonsCorePlugin;
+import org.eclipse.mylyn.internal.commons.core.operations.NullOperationMonitor;
+import org.eclipse.mylyn.internal.commons.core.operations.OperationMonitor;
+
+/**
+ * @author Steffen Pingel
+ * @since 3.7
+ */
+public class OperationUtil {
+
+	private static final int POLL_INTERVAL = 500;
+
+	public static IOperationMonitor convert(IProgressMonitor monitor) {
+		return convert(monitor, "", 0); //$NON-NLS-1$
+	}
+
+	public static IOperationMonitor convert(IProgressMonitor monitor, int work) {
+		return convert(monitor, "", work); //$NON-NLS-1$
+	}
+
+	public static IOperationMonitor convert(IProgressMonitor monitor, String taskName, int work) {
+		if (monitor instanceof IOperationMonitor) {
+			return (IOperationMonitor) monitor;
+		}
+		if (monitor == null) {
+			return new NullOperationMonitor();
+		}
+		return new OperationMonitor(null, monitor, taskName, work);
+	}
+
+	/**
+	 * @since 3.7
+	 */
+	public static synchronized ExecutorService getExecutorService() {
+		return CommonsCorePlugin.getExecutorService();
+	}
+
+	/**
+	 * @since 3.7
+	 */
+	public static <T> T execute(IProgressMonitor monitor, Operation<T> request) throws Throwable {
+		// check for legacy reasons
+		SubMonitor subMonitor = (monitor instanceof SubMonitor) ? (SubMonitor) monitor : SubMonitor.convert(null);
+
+		Future<T> future = getExecutorService().submit(request);
+		while (true) {
+			if (monitor.isCanceled()) {
+				request.abort();
+
+				// wait for executor to finish
+				future.cancel(false);
+				try {
+					if (!future.isCancelled()) {
+						future.get();
+					}
+				} catch (CancellationException e) {
+					// ignore
+				} catch (InterruptedException e) {
+					// ignore
+				} catch (ExecutionException e) {
+					// ignore
+				}
+				throw new OperationCanceledException();
+			}
+
+			try {
+				return future.get(POLL_INTERVAL, TimeUnit.MILLISECONDS);
+			} catch (ExecutionException e) {
+				throw e.getCause();
+			} catch (TimeoutException ignored) {
+			}
+
+			subMonitor.setWorkRemaining(20);
+			subMonitor.worked(1);
+		}
+	}
+
+}