org.eclipse.persistence.tools.profiler.QueryMonitor Maven / Gradle / Ivy
Show all versions of eclipselink Show documentation
/*******************************************************************************
* Copyright (c) 1998, 2013 Oracle and/or its affiliates. All rights reserved.
* This program and the accompanying materials are made available under the
* terms of the Eclipse Public License v1.0 and Eclipse Distribution License v. 1.0
* which accompanies this distribution.
* The Eclipse Public License is available at http://www.eclipse.org/legal/epl-v10.html
* and the Eclipse Distribution License is available at
* http://www.eclipse.org/org/documents/edl-v10.php.
*
* Contributors:
* Oracle - initial API and implementation from Oracle TopLink
******************************************************************************/
package org.eclipse.persistence.tools.profiler;
import java.io.StringWriter;
import java.util.*;
import java.util.concurrent.ConcurrentHashMap;
import org.eclipse.persistence.queries.*;
/**
* 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 Map cacheHits = new ConcurrentHashMap();
public static 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 = System.getProperty("org.eclipse.persistence.querymonitor");
if ((property != null) && (property.toUpperCase().equals("TRUE"))) {
shouldMonitor = Boolean.TRUE;
}
}
return shouldMonitor.booleanValue();
}
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 = Integer.valueOf(0);
}
Number misses = cacheMisses.get(query);
if (misses == null) {
misses = Integer.valueOf(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.toString());
}
}
public static void incrementReadObjectHits(ReadObjectQuery query) {
checkDumpTime();
String name = query.getReferenceClass().getName() + "-findByPrimaryKey";
Number hits = cacheHits.get(name);
if (hits == null) {
hits = Integer.valueOf(0);
}
hits = Integer.valueOf(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 = Integer.valueOf(0);
}
misses = Integer.valueOf(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 = Integer.valueOf(0);
}
hits = Integer.valueOf(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 = Integer.valueOf(0);
}
misses = Integer.valueOf(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 = Integer.valueOf(0);
}
misses = Integer.valueOf(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 = Integer.valueOf(0);
}
misses = Integer.valueOf(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 = Integer.valueOf(0);
}
misses = Integer.valueOf(misses.intValue() + 1);
cacheMisses.put(name, misses);
}
}