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AspectJ tools most notably contains the AspectJ compiler (AJC). AJC applies aspects to Java classes during compilation, fully replacing Javac for plain Java classes and also compiling native AspectJ or annotation-based @AspectJ syntax. Furthermore, AJC can weave aspects into existing class files in a post-compile binary weaving step. This library is a superset of AspectJ weaver and hence also of AspectJ runtime.

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/*******************************************************************************
 * Copyright (c) 2004, 2013 IBM Corporation and others.
 *
 * 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 available at
 * https://www.eclipse.org/legal/epl-2.0/
 *
 * SPDX-License-Identifier: EPL-2.0
 *
 * Contributors:
 *     IBM Corporation - initial API and implementation
 *******************************************************************************/
package org.eclipse.osgi.internal.location;

import java.io.IOException;

/**
 * Internal class.
 */
public interface Locker {
	public boolean lock() throws IOException;

	public boolean isLocked() throws IOException;

	public void release();

	static class MockLocker implements Locker {
		/**
		 * @throws IOException
		 */
		@Override
		public boolean lock() throws IOException {
			// locking always successful
			return true;
		}

		@Override
		public boolean isLocked() {
			// this lock is never locked
			return false;
		}

		@Override
		public void release() {
			// nothing to release
		}

	}
}