| /* |
| * Copyright (c) 1998, 2020 Oracle and/or its affiliates. All rights reserved. |
| * Copyright (c) 2016, 2020 IBM Corporation. All rights reserved. |
| * |
| * This program and the accompanying materials are made available under the |
| * terms of the Eclipse Public License v. 2.0 which is available at |
| * http://www.eclipse.org/legal/epl-2.0, |
| * or the Eclipse Distribution License v. 1.0 which is available at |
| * http://www.eclipse.org/org/documents/edl-v10.php. |
| * |
| * SPDX-License-Identifier: EPL-2.0 OR BSD-3-Clause |
| */ |
| |
| // Contributors: |
| // Oracle - initial API and implementation from Oracle TopLink |
| // 08/29/2016 Jody Grassel |
| // - 500441: Eclipselink core has System.getProperty() calls that are not potentially executed under doPriv() |
| package org.eclipse.persistence.tools.profiler; |
| |
| import java.util.*; |
| |
| import org.eclipse.persistence.internal.security.PrivilegedAccessHelper; |
| |
| /** |
| * <p><b>Purpose</b>: |
| * Provide a very simple low overhead means for measuring fetch group field usage. |
| * This can be useful for performance analysis in a complex system. |
| * This monitor is enabled through the System property "org.eclipse.persistence.fetchgroupmonitor=true". |
| * It dumps the attribute used for a class every time a new attribute is accessed. |
| * |
| * @author James Sutherland |
| * @since TopLink 10.1.3.2 |
| */ |
| public class FetchGroupMonitor { |
| |
| public static Hashtable<Class<?>, Set<String>> fetchedAttributes = new Hashtable<Class<?>, Set<String>>(); |
| public static Boolean shouldMonitor; |
| |
| public static boolean shouldMonitor() { |
| if (shouldMonitor == null) { |
| shouldMonitor = Boolean.FALSE; |
| String property = PrivilegedAccessHelper.getSystemProperty("org.eclipse.persistence.fetchgroupmonitor"); |
| if ((property != null) && (property.toUpperCase().equals("TRUE"))) { |
| shouldMonitor = Boolean.TRUE; |
| } |
| } |
| return shouldMonitor.booleanValue(); |
| } |
| |
| public static void recordFetchedAttribute(Class<?> domainClass, String attributeName) { |
| if (! shouldMonitor()) { |
| return; |
| } |
| synchronized (fetchedAttributes) { |
| Set<String> classesFetchedAttributes = fetchedAttributes.get(domainClass); |
| if (classesFetchedAttributes == null) { |
| classesFetchedAttributes = new HashSet<String>(); |
| fetchedAttributes.put(domainClass, classesFetchedAttributes); |
| } |
| if (!classesFetchedAttributes.contains(attributeName)) { |
| classesFetchedAttributes.add(attributeName); |
| } |
| } |
| } |
| } |