New multi-job for processing a queue of jobs

diff --git a/bundles/org.eclipse.core.runtime/src/org/eclipse/core/runtime/jobs/MultiJob.java b/bundles/org.eclipse.core.runtime/src/org/eclipse/core/runtime/jobs/MultiJob.java
new file mode 100644
index 0000000..e654cd6
--- /dev/null
+++ b/bundles/org.eclipse.core.runtime/src/org/eclipse/core/runtime/jobs/MultiJob.java

@@ -0,0 +1,74 @@
+/**********************************************************************
+ * Copyright (c) 2003 IBM Corporation and others. All rights reserved.   This
+ * program and the accompanying materials are made available under the terms of
+ * the Common Public License v1.0 which accompanies this distribution, and is
+ * available at http://www.eclipse.org/legal/cpl-v10.html
+ * 
+ * Contributors: 
+ * IBM - Initial API and implementation
+ **********************************************************************/
+package org.eclipse.core.runtime.jobs;
+
+import org.eclipse.core.internal.jobs.Queue;
+import org.eclipse.core.runtime.*;
+
+/**
+ * A MultiJob processes its own queue of work items until the queue is empty,
+ * and schedules itself when necessary.  This ensures that all work is done in
+ * a strictly sequential order, and in one thread.
+ */
+public abstract class MultiJob extends Job {
+	private Queue queue = new Queue();
+	/**
+	 * True when actively processing the work queue or waiting to do so.  False
+	 * otherwise (when finished processing the work queue, or when not scheduled).
+	 */
+	private boolean working;
+	private String taskName;
+	
+	public MultiJob(String name) {
+		this.taskName = name == null ? "" : name; //$NON-NLS-1$
+		//add a listener to reschedule the job if there is work to do
+		addJobChangeListener(new JobChangeAdapter() {
+			public void done(Job job, IStatus result) {
+				boolean hasWork = false;
+				synchronized (queue) {
+					hasWork = queue.isEmpty();
+				}
+				if (hasWork & !working) {
+					working = true;
+					schedule();
+				}
+			}
+		});
+	}
+	public final void addWork(Object work) {
+		synchronized (queue) {
+			queue.enqueue(work);
+		}
+		if (!working) {
+			working = true;
+			schedule();
+		}
+	}
+	public abstract IStatus doWork(Object work);
+	public final IStatus run(IProgressMonitor monitor) {
+		monitor.beginTask(taskName, IProgressMonitor.UNKNOWN);
+		try {
+			Object work = null;
+			while (working) {
+				synchronized (queue) {
+					work = queue.dequeue();
+					if (work == null) {
+						working = false;
+						break;
+					}
+				}
+				doWork(work);
+			}
+		} finally {
+			monitor.done();
+		}
+		return Status.OK_STATUS;
+	}
+}
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