All Downloads are FREE. Search and download functionalities are using the official Maven repository.

org.eclipse.persistence.tools.profiler.QueryMonitor Maven / Gradle / Ivy

The newest version!
/*
 * Copyright (c) 1998, 2024 Oracle and/or its affiliates. All rights reserved.
 * Copyright (c) 1998, 2024 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 org.eclipse.persistence.internal.security.PrivilegedAccessHelper;
import org.eclipse.persistence.queries.DeleteObjectQuery;
import org.eclipse.persistence.queries.ReadAllQuery;
import org.eclipse.persistence.queries.ReadObjectQuery;
import org.eclipse.persistence.queries.WriteObjectQuery;

import java.io.StringWriter;
import java.util.Map;
import java.util.Set;
import java.util.TreeSet;
import java.util.concurrent.ConcurrentHashMap;

/**
 * 

Purpose: * Provide a very simple low overhead means for measuring query executions, and cache hits. * This can be useful for performance analysis in a complex system. * This monitor is enabled through the System property "org.eclipse.persistence.querymonitor=true" or * through the persistence.xml property eclipselink.profiler=QueryMonitor. * It dumps the number of query cache hits, and executions (misses) once every 100s. * * @author James Sutherland * @since TopLink 10.1.3 */ public class QueryMonitor { public static final Map cacheHits = new ConcurrentHashMap<>(); public static final Map cacheMisses = new ConcurrentHashMap<>(); public static long dumpTime = System.currentTimeMillis(); public static Boolean shouldMonitor; public static boolean shouldMonitor() { if (shouldMonitor == null) { shouldMonitor = Boolean.FALSE; String property = PrivilegedAccessHelper.getSystemProperty("org.eclipse.persistence.querymonitor"); if ((property != null) && (property.equalsIgnoreCase("TRUE"))) { shouldMonitor = Boolean.TRUE; } } return shouldMonitor; } public static void checkDumpTime() { if ((System.currentTimeMillis() - dumpTime) > 100000) { dumpTime = System.currentTimeMillis(); StringWriter writer = new StringWriter(); writer.write("Query Monitor:"); writer.write(String.valueOf(dumpTime)); writer.write("\n"); writer.write("Query"); writer.write("\t"); writer.write("Cache"); writer.write("\t"); writer.write("Database"); writer.write("\n"); Set queries = new TreeSet<>(cacheMisses.keySet()); queries.addAll(cacheHits.keySet()); for (String query : queries) { Number hits = cacheHits.get(query); if (hits == null) { hits = 0; } Number misses = cacheMisses.get(query); if (misses == null) { misses = 0; } writer.write(query); writer.write("\t"); writer.write(hits.toString()); writer.write("\t"); writer.write(misses.toString()); writer.write("\n"); } System.out.println(writer); } } public static void incrementReadObjectHits(ReadObjectQuery query) { checkDumpTime(); String name = query.getReferenceClass().getName() + "-findByPrimaryKey"; Number hits = cacheHits.get(name); if (hits == null) { hits = 0; } hits = hits.intValue() + 1; cacheHits.put(name, hits); } public static void incrementReadObjectMisses(ReadObjectQuery query) { checkDumpTime(); String name = query.getReferenceClass().getName() + "-findByPrimaryKey"; Number misses = cacheMisses.get(name); if (misses == null) { misses = 0; } misses = misses.intValue() + 1; cacheMisses.put(name, misses); } public static void incrementReadAllHits(ReadAllQuery query) { checkDumpTime(); String name = query.getReferenceClass().getName(); if (query.getName() == null) { name = name + "-findAll"; } else { name = name + "-" + query.getName(); } Number hits = cacheHits.get(name); if (hits == null) { hits = 0; } hits = hits.intValue() + 1; cacheHits.put(name, hits); } public static void incrementReadAllMisses(ReadAllQuery query) { checkDumpTime(); String name = query.getReferenceClass().getName(); if (query.getName() == null) { name = name + "-findAll"; } else { name = name + "-" + query.getName(); } Number misses = cacheMisses.get(name); if (misses == null) { misses = 0; } misses = misses.intValue() + 1; cacheMisses.put(name, misses); } public static void incrementInsert(WriteObjectQuery query) { checkDumpTime(); String name = query.getReferenceClass().getName() + "-insert"; Number misses = cacheMisses.get(name); if (misses == null) { misses = 0; } misses = misses.intValue() + 1; cacheMisses.put(name, misses); } public static void incrementUpdate(WriteObjectQuery query) { checkDumpTime(); String name = query.getReferenceClass().getName() + "-update"; Number misses = cacheMisses.get(name); if (misses == null) { misses = 0; } misses = misses.intValue() + 1; cacheMisses.put(name, misses); } public static void incrementDelete(DeleteObjectQuery query) { checkDumpTime(); String name = query.getReferenceClass().getName() + "-delete"; Number misses = cacheMisses.get(name); if (misses == null) { misses = 0; } misses = misses.intValue() + 1; cacheMisses.put(name, misses); } }





© 2015 - 2024 Weber Informatics LLC | Privacy Policy