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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) 2006, 2016 Cognos Incorporated, 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
 ******************************************************************************/
package org.eclipse.osgi.internal.log;

import java.util.*;
import org.eclipse.equinox.log.ExtendedLogReaderService;
import org.eclipse.equinox.log.LogFilter;
import org.osgi.service.log.LogEntry;
import org.osgi.service.log.LogListener;

public class ExtendedLogReaderServiceImpl implements ExtendedLogReaderService {

	private final ExtendedLogReaderServiceFactory factory;
	private Set listeners = new HashSet<>();

	ExtendedLogReaderServiceImpl(ExtendedLogReaderServiceFactory factory) {
		this.factory = factory;
	}

	@Override
	public synchronized void addLogListener(LogListener listener, LogFilter filter) {
		checkShutdown();
		if (listener == null)
			throw new IllegalArgumentException("LogListener must not be null"); //$NON-NLS-1$

		if (filter == null)
			throw new IllegalArgumentException("LogFilter must not be null"); //$NON-NLS-1$

		listeners.add(listener);
		factory.addLogListener(listener, filter);
	}

	@Override
	public void addLogListener(LogListener listener) {
		addLogListener(listener, ExtendedLogReaderServiceFactory.NULL_LOGGER_FILTER);
	}

	@Override
	public Enumeration getLog() {
		checkShutdown();
		return factory.getLog();
	}

	@Override
	public synchronized void removeLogListener(LogListener listener) {
		checkShutdown();
		if (listener == null)
			throw new IllegalArgumentException("LogListener must not be null"); //$NON-NLS-1$

		factory.removeLogListener(listener);
		listeners.remove(listener);
	}

	private synchronized void checkShutdown() {
		if (listeners == null)
			throw new IllegalStateException("LogReaderService is shutdown."); //$NON-NLS-1$
	}

	synchronized void shutdown() {
		for (LogListener listener : listeners) {
			factory.removeLogListener(listener);
		}
		listeners = null;
	}
}