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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) 2005, 2016 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.log;

import java.util.Arrays;
import java.util.Collection;
import java.util.HashSet;
import org.osgi.framework.BundleContext;
import org.osgi.framework.Constants;
import org.osgi.framework.ServiceReference;
import org.osgi.util.tracker.ServiceTracker;
import org.osgi.util.tracker.ServiceTrackerCustomizer;

public class EventAdminAdapter implements ServiceTrackerCustomizer {
	public static final String EVENT_TOPIC = "event.topics"; //$NON-NLS-1$
	private static final String[] LOG_TOPICS_ARRAY = {"*", "org/*", "org/osgi/*", "org/osgi/service/*", "org/osgi/service/log/*", "org/osgi/service/log/LogEntry/*", "org/osgi/service/log/LogEntry/LOG_ERROR", "org/osgi/service/log/LogEntry/LOG_WARNING", "org/osgi/service/log/LogEntry/LOG_INFO", "org/osgi/service/log/LogEntry/LOG_DEBUG", "org/osgi/service/log/LogEntry/LOG_OTHER"}; //$NON-NLS-1$ //$NON-NLS-2$ //$NON-NLS-3$ //$NON-NLS-4$ //$NON-NLS-5$ //$NON-NLS-6$ //$NON-NLS-7$ //$NON-NLS-8$ //$NON-NLS-9$//$NON-NLS-10$ //$NON-NLS-11$
	private static final Object LOG_TOPIC_TOKEN = new Object();
	private static Collection logTopics = new HashSet<>(Arrays.asList(LOG_TOPICS_ARRAY));
	private static Collection eventAdminObjectClass = Arrays.asList("org.osgi.service.event.EventAdmin"); //$NON-NLS-1$
	private static Collection eventHandlerObjectClass = Arrays.asList("org.osgi.service.event.EventHandler"); //$NON-NLS-1$

	private ServiceTracker eventAdminTracker;
	private ServiceTracker eventHandlerTracker;
	private BundleContext context;
	private ServiceReference eventAdmin;
	private int logEventHandlers;
	private ExtendedLogReaderServiceFactory logReaderServiceFactory;
	private EventAdminLogListener logListener;

	public EventAdminAdapter(BundleContext context, ExtendedLogReaderServiceFactory logReaderServiceFactory) {
		this.context = context;
		this.logReaderServiceFactory = logReaderServiceFactory;
		eventAdminTracker = new ServiceTracker<>(context, "org.osgi.service.event.EventAdmin", this); //$NON-NLS-1$
		eventHandlerTracker = new ServiceTracker<>(context, "org.osgi.service.event.EventHandler", this); //$NON-NLS-1$
	}

	public void start() {
		eventAdminTracker.open(true);
		eventHandlerTracker.open(true);
	}

	public void stop() {
		eventAdminTracker.close();
		eventHandlerTracker.close();
	}

	@Override
	public Object addingService(ServiceReference reference) {
		Object toTrack = null;
		Object objectClass = reference.getProperty(Constants.OBJECTCLASS);
		Object topics = reference.getProperty(EVENT_TOPIC);
		if (checkServiceProp(objectClass, eventAdminObjectClass) && eventAdmin == null) {
			toTrack = reference;
			eventAdmin = reference;
		} else if (checkServiceProp(objectClass, eventHandlerObjectClass) && checkServiceProp(topics, logTopics)) {
			logEventHandlers++;
			toTrack = LOG_TOPIC_TOKEN;
		}

		if (eventAdmin != null && logEventHandlers > 0 && logListener == null) {
			try {
				logListener = new EventAdminLogListener(context.getService(eventAdmin));
			} catch (ClassNotFoundException | NoSuchMethodException e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			}
			logReaderServiceFactory.addLogListener(logListener, ExtendedLogReaderServiceFactory.NULL_LOGGER_FILTER);
		}

		return toTrack;
	}

	@Override
	public void modifiedService(ServiceReference reference, Object tracked) {
		removedService(reference, tracked);
		addingService(reference);
	}

	@Override
	public void removedService(ServiceReference reference, Object tracked) {
		if (tracked == eventAdmin) {
			eventAdmin = null;
			context.ungetService(reference);
		} else if (LOG_TOPIC_TOKEN == tracked) {
			logEventHandlers--;
		}

		if (logListener != null && (eventAdmin == null || logEventHandlers == 0)) {
			logReaderServiceFactory.removeLogListener(logListener);
			logListener = null;
		}
	}

	private static boolean checkServiceProp(Object property, Collection check) {
		if (property instanceof String)
			return check.contains(property);

		if (property instanceof String[]) {
			String[] topics = (String[]) property;
			for (String topic : topics) {
				if (check.contains(topic)) {
					return true;
				}
			}
		}

		if (property instanceof Collection) {
			for (Object prop : (Collection) property)
				if (check.contains(prop))
					return true;
		}
		return false;
	}
}
 















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