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Java Source Code / Java Documentation » J2EE » spring framework 2.5 » org.springframework.util

Source Cross Reference Class Diagram Java Document (Java Doc)

java.lang .Object

org.springframework.util .StopWatch

StopWatch

public class StopWatch (Code)

Simple stop watch, allowing for timing of a number of tasks, exposing total running time and running time for each named task.

Conceals use of System.currentTimeMillis(), improving the readability of application code and reducing the likelihood of calculation errors.

Note that this object is not designed to be thread-safe and does not use synchronization.

This class is normally used to verify performance during proof-of-concepts and in development, rather than as part of production applications.
author:
   Rod Johnson
author:
   Juergen Hoeller
since:
   May 2, 2001

Inner Class :public static class TaskInfo

Constructor Summary
public	StopWatch() Construct a new stop watch.
public	StopWatch(String id) Construct a new stop watch with the given id.

Method Summary
public long	getLastTaskTimeMillis() Return the time taken by the last task.
public int	getTaskCount() Return the number of tasks timed.
public TaskInfo[]	getTaskInfo() Return an array of the data for tasks performed.
public long	getTotalTimeMillis() Return the total time in milliseconds for all tasks.
public double	getTotalTimeSeconds() Return the total time in seconds for all tasks.
public boolean	isRunning() Return whether the stop watch is currently running.
public String	prettyPrint() Return a string with a table describing all tasks performed.
public void	setKeepTaskList(boolean keepTaskList) Determine whether the TaskInfo array is built over time.
public String	shortSummary() Return a short description of the total running time.
public void	start() Start an unnamed task.
public void	start(String taskName) Start a named task.
public void	stop() Stop the current task.
public String	toString() Return an informative string describing all tasks performed For custom reporting, call `getTaskInfo()` and use the task info directly.

Constructor Detail

StopWatch
public StopWatch()(Code)
	Construct a new stop watch. Does not start any task.

StopWatch
public StopWatch(String id)(Code)
	Construct a new stop watch with the given id. Does not start any task. Parameters: id - identifier for this stop watch.Handy when we have output from multiple stop watchesand need to distinguish between them.

Method Detail

getLastTaskTimeMillis
public long getLastTaskTimeMillis() throws IllegalStateException(Code)
	Return the time taken by the last task.

getTaskCount
public int getTaskCount()(Code)
	Return the number of tasks timed.

getTaskInfo
public TaskInfo[] getTaskInfo()(Code)
	Return an array of the data for tasks performed.

getTotalTimeMillis
public long getTotalTimeMillis()(Code)
	Return the total time in milliseconds for all tasks.

getTotalTimeSeconds
public double getTotalTimeSeconds()(Code)
	Return the total time in seconds for all tasks.

isRunning
public boolean isRunning()(Code)
	Return whether the stop watch is currently running.

prettyPrint
public String prettyPrint()(Code)
	Return a string with a table describing all tasks performed. For custom reporting, call getTaskInfo() and use the task info directly.

setKeepTaskList
public void setKeepTaskList(boolean keepTaskList)(Code)
	Determine whether the TaskInfo array is built over time. Set this to "false" when using a StopWatch for millions of intervals, or the task info structure will consume excessive memory. Default is "true".

shortSummary
public String shortSummary()(Code)
	Return a short description of the total running time.

start
public void start() throws IllegalStateException(Code)
	Start an unnamed task. The results are undefined if StopWatch.stop() or timing methods are called without invoking this method. See Also: StopWatch.stop()

start
public void start(String taskName) throws IllegalStateException(Code)
	Start a named task. The results are undefined if StopWatch.stop() or timing methods are called without invoking this method. Parameters: taskName - the name of the task to start See Also: StopWatch.stop()

stop
public void stop() throws IllegalStateException(Code)
	Stop the current task. The results are undefined if timing methods are called without invoking at least one pair StopWatch.start() / StopWatch.stop() methods. See Also: StopWatch.start()

toString
public String toString()(Code)
	Return an informative string describing all tasks performed For custom reporting, call `getTaskInfo()` and use the task info directly.

Methods inherited from java.lang.Object

native protected Object clone() throws CloneNotSupportedException(Code)(Java Doc)
public boolean equals(Object obj)(Code)(Java Doc)
protected void finalize() throws Throwable(Code)(Java Doc)
final native public Class getClass()(Code)(Java Doc)
native public int hashCode()(Code)(Java Doc)
final native public void notify()(Code)(Java Doc)
final native public void notifyAll()(Code)(Java Doc)
public String toString()(Code)(Java Doc)
final native public void wait(long timeout) throws InterruptedException(Code)(Java Doc)
final public void wait(long timeout, int nanos) throws InterruptedException(Code)(Java Doc)
final public void wait() throws InterruptedException(Code)(Java Doc)

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