org.eclipse.persistence.tools.profiler
Class QueryMonitor

java.lang.Object
  org.eclipse.persistence.tools.profiler.QueryMonitor

public class QueryMonitor
extends java.lang.Object

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". It dumps the number of query cache hits, and executions (misses) once every 100s.

Author:

James Sutherland

Since:

TopLink 10.1.3

Field Summary

static java.util.Hashtable	cacheHits
static java.util.Hashtable	cacheMisses
static long	dumpTime
static java.lang.Boolean	shouldMonitor

Constructor Summary

QueryMonitor()

Method Summary

static void	checkDumpTime()
static void	incrementDelete(DeleteObjectQuery query)
static void	incrementInsert(WriteObjectQuery query)
static void	incrementReadAllHits(ReadAllQuery query)
static void	incrementReadAllMisses(ReadAllQuery query)
static void	incrementReadObjectHits(ReadObjectQuery query)
static void	incrementReadObjectMisses(ReadObjectQuery query)
static void	incrementUpdate(WriteObjectQuery query)
static boolean	shouldMonitor()

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

cacheHits

public static java.util.Hashtable cacheHits

cacheMisses

public static java.util.Hashtable cacheMisses

dumpTime

public static long dumpTime

shouldMonitor

public static java.lang.Boolean shouldMonitor

Constructor Detail

QueryMonitor

public QueryMonitor()

Method Detail

shouldMonitor

public static boolean shouldMonitor()

checkDumpTime

public static void checkDumpTime()

incrementReadObjectHits

public static void incrementReadObjectHits(ReadObjectQuery query)

incrementReadObjectMisses

public static void incrementReadObjectMisses(ReadObjectQuery query)

incrementReadAllHits

public static void incrementReadAllHits(ReadAllQuery query)

incrementReadAllMisses

public static void incrementReadAllMisses(ReadAllQuery query)

incrementInsert

public static void incrementInsert(WriteObjectQuery query)

incrementUpdate

public static void incrementUpdate(WriteObjectQuery query)

incrementDelete

public static void incrementDelete(DeleteObjectQuery query)