Package org.eclipse.persistence.tools.profiler

Class QueryMonitor

java.lang.Object

org.eclipse.persistence.tools.profiler.QueryMonitor

public class QueryMonitor
extends 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" 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

Field Summary

Fields

Modifier and Type	Field	Description
static final Map<String,Number>	cacheHits
static final Map<String,Number>	cacheMisses
static long	dumpTime
static Boolean	shouldMonitor

Constructor Summary

Constructors

Constructor	Description
QueryMonitor()

Method Summary

Modifier and Type	Method	Description
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 Details

cacheHits

public static final Map<String,Number> cacheHits

cacheMisses

public static final Map<String,Number> cacheMisses

dumpTime

public static long dumpTime

shouldMonitor

public static Boolean shouldMonitor

Constructor Details

QueryMonitor

public QueryMonitor()

Method Details

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)