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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, 2005 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.core.internal.events;

import org.eclipse.core.resources.*;
import org.eclipse.core.runtime.PerformanceStats;

/**
 * An ResourceStats collects and aggregates timing data about an event such as
 * a builder running, an editor opening, etc.
 */
public class ResourceStats {
	/**
	 * The event that is currently occurring, maybe null
	 */
	private static PerformanceStats currentStats;
	//performance event names
	public static final String EVENT_BUILDERS = ResourcesPlugin.PI_RESOURCES + "/perf/builders"; //$NON-NLS-1$
	public static final String EVENT_LISTENERS = ResourcesPlugin.PI_RESOURCES + "/perf/listeners"; //$NON-NLS-1$
	public static final String EVENT_SAVE_PARTICIPANTS = ResourcesPlugin.PI_RESOURCES + "/perf/save.participants"; //$NON-NLS-1$
	public static final String EVENT_SNAPSHOT = ResourcesPlugin.PI_RESOURCES + "/perf/snapshot"; //$NON-NLS-1$

	//performance event enablement
	public static boolean TRACE_BUILDERS = PerformanceStats.isEnabled(ResourceStats.EVENT_BUILDERS);
	public static boolean TRACE_LISTENERS = PerformanceStats.isEnabled(ResourceStats.EVENT_LISTENERS);
	public static boolean TRACE_SAVE_PARTICIPANTS = PerformanceStats.isEnabled(ResourceStats.EVENT_SAVE_PARTICIPANTS);
	public static boolean TRACE_SNAPSHOT = PerformanceStats.isEnabled(ResourceStats.EVENT_SNAPSHOT);

	public static void endBuild() {
		if (currentStats != null)
			currentStats.endRun();
		currentStats = null;
	}

	public static void endNotify() {
		if (currentStats != null)
			currentStats.endRun();
		currentStats = null;
	}

	public static void endSave() {
		if (currentStats != null)
			currentStats.endRun();
		currentStats = null;
	}

	public static void endSnapshot() {
		if (currentStats != null)
			currentStats.endRun();
		currentStats = null;
	}

	/**
	 * Notifies the stats tool that a resource change listener has been added.
	 */
	public static void listenerAdded(IResourceChangeListener listener) {
		if (listener != null)
			PerformanceStats.getStats(EVENT_LISTENERS, listener.getClass().getName());
	}

	/**
	 * Notifies the stats tool that a resource change listener has been removed.
	 */
	public static void listenerRemoved(IResourceChangeListener listener) {
		if (listener != null)
			PerformanceStats.removeStats(EVENT_LISTENERS, listener.getClass().getName());
	}

	public static void startBuild(IncrementalProjectBuilder builder) {
		currentStats = PerformanceStats.getStats(EVENT_BUILDERS, builder);
		currentStats.startRun(builder.getProject().getName());
	}

	public static void startNotify(IResourceChangeListener listener) {
		currentStats = PerformanceStats.getStats(EVENT_LISTENERS, listener);
		currentStats.startRun();
	}

	public static void startSnapshot() {
		currentStats = PerformanceStats.getStats(EVENT_SNAPSHOT, ResourcesPlugin.getWorkspace());
		currentStats.startRun();
	}

	public static void startSave(ISaveParticipant participant) {
		currentStats = PerformanceStats.getStats(EVENT_SAVE_PARTICIPANTS, participant);
		currentStats.startRun();
	}
}