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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) 2000, 2015 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
 *     Julian Chen - fix for bug #92572, jclRM
 *     Sergey Prigogin (Google) - use parameterized types (bug 442021)
 *******************************************************************************/
package org.eclipse.core.internal.runtime;

import java.util.ArrayList;
import org.eclipse.core.runtime.*;

/**
 * NOT API!!!  This log infrastructure was split from the InternalPlatform.
 * 
 * @since org.eclipse.equinox.common 3.2
 */
public final class RuntimeLog {

	private static ArrayList logListeners = new ArrayList<>(5);

	/**
	 * Keep the messages until the first log listener is registered.
	 * Once first log listeners is registred, it is going to receive
	 * all status messages accumulated during the period when no log
	 * listener was available.
	 */
	private static ArrayList queuedMessages = new ArrayList<>(5);

	private static PlatformLogWriter logWriter;

	static void setLogWriter(PlatformLogWriter logWriter) {
		synchronized (logListeners) {
			boolean firstListener = isEmpty();
			RuntimeLog.logWriter = logWriter;
			if (firstListener && logWriter != null)
				emptyQueuedMessages();
		}
	}

	/**
	 * See org.eclipse.core.runtime.Platform#addLogListener(ILogListener)
	 */
	public static void addLogListener(ILogListener listener) {
		synchronized (logListeners) {
			boolean firstListener = isEmpty();
			// replace if already exists (Set behaviour but we use an array
			// since we want to retain order)
			logListeners.remove(listener);
			logListeners.add(listener);
			if (firstListener)
				emptyQueuedMessages();
		}
	}

	/**
	 * See org.eclipse.core.runtime.Platform#removeLogListener(ILogListener)
	 */
	public static void removeLogListener(ILogListener listener) {
		synchronized (logListeners) {
			logListeners.remove(listener);
		}
	}

	/**
	 * Checks if the given listener is present
	 */
	public static boolean contains(ILogListener listener) {
		synchronized (logListeners) {
			return logListeners.contains(listener);
		}
	}

	/**
	 * Notifies all listeners of the platform log.
	 */
	public static void log(final IStatus status) {
		// create array to avoid concurrent access
		ILogListener[] listeners = null;
		PlatformLogWriter writer;
		synchronized (logListeners) {
			writer = logWriter;
			if (writer == null) {
				if (logListeners.isEmpty()) {
					queuedMessages.add(status);
					return;
				}
				listeners = logListeners.toArray(new ILogListener[logListeners.size()]);
			}
		}
		if (writer != null) {
			writer.logging(status);
			return;
		}
		if (listeners != null) {
			for (ILogListener listener : listeners) {
				try {
					listener.logging(status, IRuntimeConstants.PI_RUNTIME);
				}catch (Exception | LinkageError e) {
					handleException(e);
				}
			}
		}
	}

	private static void handleException(Throwable e) {
		if (!(e instanceof OperationCanceledException)) {
			// Got a error while logging. Don't try to log again, just put it into stderr 
			e.printStackTrace();
		}
	}

	/**
	 * Helps determine if the logging mechanism is ready for logging.
	 * @return true the logging mechanism is ready for logging.
	 */
	public static boolean isEmpty() {
		synchronized (logListeners) {
			return (logListeners.isEmpty()) && (logWriter == null);
		}
	}

	/**
	 * Determines if there are any listeners
	 * @return true if there is at least one listener.
	 */
	public static boolean hasListeners() {
		synchronized (logListeners) {
			return (!logListeners.isEmpty());
		}
	}

	private static void emptyQueuedMessages() {
		IStatus[] queued;
		synchronized (logListeners) {
			if (queuedMessages.isEmpty())
				return;
			queued = queuedMessages.toArray(new IStatus[queuedMessages.size()]);
			queuedMessages.clear();
		}
		for (IStatus s : queued) {
			log(s);
		}
	}

	static void logToListeners(IStatus status) {
		// create array to avoid concurrent access
		ILogListener[] listeners;
		synchronized (logListeners) {
			listeners = logListeners.toArray(new ILogListener[logListeners.size()]);
		}
		for (ILogListener listener : listeners) {
			try {
				listener.logging(status, IRuntimeConstants.PI_RUNTIME);
			}catch (Exception | LinkageError e) {
				handleException(e);
			}
		}
	}

}