Top Description Fields Constructors Methods
org.eclipse.persistence.tools.profiler

public Class QueryMonitor

extends Object
Class Inheritance
Imports
java.io.StringWriter, java.util.*, java.util.concurrent.ConcurrentHashMap, org.eclipse.persistence.internal.security.PrivilegedAccessHelper, 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

Field Summary

Modifier and TypeField and Description
public static final Map<String, Number>
cacheHits

public static final Map<String, Number>
cacheMisses

public static long
dumpTime

public static Boolean
shouldMonitor

Constructor Summary

AccessConstructor and Description
public
QueryMonitor()

Method Summary

Modifier and TypeMethod and Description
public static void
checkDumpTime()

public static void
incrementDelete(DeleteObjectQuery query)

public static void
incrementInsert(WriteObjectQuery query)

public static void
incrementReadAllHits(ReadAllQuery query)

public static void
incrementReadAllMisses(ReadAllQuery query)

public static void
incrementReadObjectHits(ReadObjectQuery query)

public static void
incrementReadObjectMisses(ReadObjectQuery query)

public static void
incrementUpdate(WriteObjectQuery query)

public static boolean
shouldMonitor()

Inherited from java.lang.Object:
cloneequalsfinalizegetClasshashCodenotifynotifyAlltoStringwaitwaitwait

Field Detail

cacheHitsback to summary
public static final Map<String, Number> cacheHits
cacheMissesback to summary
public static final Map<String, Number> cacheMisses
dumpTimeback to summary
public static long dumpTime
shouldMonitorback to summary
public static Boolean shouldMonitor

Constructor Detail

QueryMonitorback to summary
public QueryMonitor()

Method Detail

checkDumpTimeback to summary
public static void checkDumpTime()
incrementDeleteback to summary
public static void incrementDelete(DeleteObjectQuery query)
incrementInsertback to summary
public static void incrementInsert(WriteObjectQuery query)
incrementReadAllHitsback to summary
public static void incrementReadAllHits(ReadAllQuery query)
incrementReadAllMissesback to summary
public static void incrementReadAllMisses(ReadAllQuery query)
incrementReadObjectHitsback to summary
public static void incrementReadObjectHits(ReadObjectQuery query)
incrementReadObjectMissesback to summary
public static void incrementReadObjectMisses(ReadObjectQuery query)
incrementUpdateback to summary
public static void incrementUpdate(WriteObjectQuery query)
shouldMonitorback to summary
public static boolean shouldMonitor()