com.solarmetric.jdbc
Class PerformanceTracker

java.lang.Object
  org.apache.openjpa.lib.jdbc.AbstractJDBCListener
      com.solarmetric.jdbc.PerformanceTracker

All Implemented Interfaces:

JDBCListener

public class PerformanceTracker
extends AbstractJDBCListener

A global tracker of performance-related statistics. All the performance-related statistics are available as public static variables which can be accessed directly by an application. A PerformanceTracker must be added as a JDBCListener. Performance statistics are logged whenever a commit occurs. A summary of performance statistics can be obtained by invoking the static summarizePerformance() method at any time.

Field Summary

static long	commitMaxTime The slowest commit made on a Connection.
static long	commitMinTime The fastest commit made on a Connection.
static long	commits The total number of commits made on a Connection.
static long	commitTimes The total time taken on the execution of commits made on all Connections.
static long	executePreparedStatementMaxTime The slowest PreparedStatement execution.
static long	executePreparedStatementMinTime The fastest PreparedStatement execution.
static long	executePreparedStatements The total number of PreparedStatements executed.
static long	executePreparedStatementTimes The total time taken on the execution of PreparedStatements.
static long	executeStatementMaxTime The slowest Statement executions.
static long	executeStatementMinTime The fastest Statement executions.
static long	executeStatements The total number of Statements that have been executed.
static long	executeStatementTimes The total time for all Statement executions.
static int	maxStatementTracking The number of slow statements we will track.
static long	rollbackMaxTime The slowest rollback made on a Connection.
static long	rollbackMinTime The fastest rollback made on a Connection.
static long	rollbacks The total number of rollbacks made on a Connection.
static long	rollbackTimes The total time taken on the execution of rollbacks made on all Connections.
static Map	slowestStatements A Map of SQLString : time, to track the slowest statements we have seen.
static SortedSet	statementTimes A cache of the time elements in slowestStatements.

Constructor Summary

PerformanceTracker()

Method Summary

void	afterCommit(JDBCEvent event)
void	afterExecuteStatement(JDBCEvent event)
void	afterRollback(JDBCEvent event)
static void	reset() Reset all global statistics to their default values.
static void	setLog(Log log) Set the log to write to.
static String	summarizePerformance()
long	time(JDBCEvent event)
String	toString() Summarize the statistics.
void	trackSlowStatements(String sql, long time)

Methods inherited from class org.apache.openjpa.lib.jdbc.AbstractJDBCListener

afterConnect, afterCreateStatement, afterPrepareStatement, afterReturn, beforeClose, beforeCommit, beforeCreateStatement, beforeExecuteStatement, beforePrepareStatement, beforeReturn, beforeRollback, eventOccurred

Methods inherited from class java.lang.Object

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

Field Detail

executeStatements

public static long executeStatements

The total number of Statements that have been executed.

executeStatementTimes

public static long executeStatementTimes

The total time for all Statement executions.

executeStatementMinTime

public static long executeStatementMinTime

The fastest Statement executions.

executeStatementMaxTime

public static long executeStatementMaxTime

The slowest Statement executions.

executePreparedStatements

public static long executePreparedStatements

The total number of PreparedStatements executed.

executePreparedStatementTimes

public static long executePreparedStatementTimes

The total time taken on the execution of PreparedStatements.

executePreparedStatementMinTime

public static long executePreparedStatementMinTime

The fastest PreparedStatement execution.

executePreparedStatementMaxTime

public static long executePreparedStatementMaxTime

The slowest PreparedStatement execution.

commits

public static long commits

The total number of commits made on a Connection.

commitTimes

public static long commitTimes

The total time taken on the execution of commits made on all Connections.

commitMinTime

public static long commitMinTime

The fastest commit made on a Connection.

commitMaxTime

public static long commitMaxTime

The slowest commit made on a Connection.

rollbacks

public static long rollbacks

The total number of rollbacks made on a Connection.

rollbackTimes

public static long rollbackTimes

The total time taken on the execution of rollbacks made on all Connections.

rollbackMinTime

public static long rollbackMinTime

The fastest rollback made on a Connection.

rollbackMaxTime

public static long rollbackMaxTime

The slowest rollback made on a Connection.

maxStatementTracking

public static int maxStatementTracking

The number of slow statements we will track.

slowestStatements

public static Map slowestStatements

A Map of SQLString : time, to track the slowest statements we have seen.

statementTimes

public static SortedSet statementTimes

A cache of the time elements in slowestStatements.

Constructor Detail

PerformanceTracker

public PerformanceTracker()

Method Detail

reset

public static void reset()

Reset all global statistics to their default values.

setLog

public static void setLog(Log log)

Set the log to write to.

afterExecuteStatement

public void afterExecuteStatement(JDBCEvent event)

Specified by:

afterExecuteStatement in interface JDBCListener

Overrides:

afterExecuteStatement in class AbstractJDBCListener

trackSlowStatements

public void trackSlowStatements(String sql,
                                long time)

afterCommit

public void afterCommit(JDBCEvent event)

Specified by:

afterCommit in interface JDBCListener

Overrides:

afterCommit in class AbstractJDBCListener

afterRollback

public void afterRollback(JDBCEvent event)

Specified by:

afterRollback in interface JDBCListener

Overrides:

afterRollback in class AbstractJDBCListener

time

public final long time(JDBCEvent event)

Returns:

the time it took for an event to complete, based on the specified event's time with the associated event's time subtracted.

summarizePerformance

public static String summarizePerformance()

toString

public String toString()

Summarize the statistics.

Overrides:

toString in class Object