Class StopWatch
StopWatch
provides a convenient API for timings.
To start the watch, call start()
or createStarted()
. At this point you can:
split()
the watch to get the time whilst the watch continues in the background.unsplit()
will remove the effect of the split. At this point, these three options are available again.suspend()
the watch to pause it.resume()
allows the watch to continue. Any time between the suspend and resume will not be counted in the total. At this point, these three options are available again.stop()
the watch to complete the timing session.
It is intended that the output methods toString()
and getTime()
should only be called after stop,
split or suspend, however a suitable result will be returned at other points.
NOTE: As from v2.1, the methods protect against inappropriate calls. Thus you cannot now call stop before start, resume before suspend or unsplit before split.
1. split(), suspend(), or stop() cannot be invoked twice
2. unsplit() may only be called if the watch has been split()
3. resume() may only be called if the watch has been suspend()
4. start() cannot be called twice without calling reset()
This class is not thread-safe
- Since:
- 2.0
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Constructor Summary
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Method Summary
Modifier and TypeMethodDescriptionstatic StopWatch
create()
Creates a stopwatch for convenience.static StopWatch
Creates a started stopwatch for convenience.Returns the time formatted byDurationFormatUtils.formatDurationHMS(long)
.Returns the split time formatted byDurationFormatUtils.formatDurationHMS(long)
.Gets the message for string presentation.long
Gets the elapsed time in nanoseconds.long
Gets the split time in nanoseconds.long
Gets the split time on the stopwatch.long
Gets the time this stopwatch was started in milliseconds, between the current time and midnight, January 1, 1970 UTC.long
Gets the time this stopwatch was stopped in milliseconds, between the current time and midnight, January 1, 1970 UTC.long
getTime()
Gets the time on the stopwatch.long
Gets the time in the specified TimeUnit.boolean
Returns whether the StopWatch is started.boolean
Returns whether StopWatch is stopped.boolean
Returns whether the StopWatch is suspended.void
reset()
Resets the stopwatch.void
resume()
Resumes the stopwatch after a suspend.void
split()
Splits the time.void
start()
Starts the stopwatch.void
stop()
Stops the stopwatch.void
suspend()
Suspends the stopwatch for later resumption.Gets a summary of the split time that the stopwatch recorded as a string.toString()
Gets a summary of the time that the stopwatch recorded as a string.void
unsplit()
Removes a split.
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Constructor Details
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StopWatch
public StopWatch()Constructor.
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StopWatch
Constructor.
- Parameters:
message
- A message for string presentation.- Since:
- 3.10
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Method Details
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create
Creates a stopwatch for convenience.- Returns:
- StopWatch a stopwatch.
- Since:
- 3.10
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createStarted
Creates a started stopwatch for convenience.- Returns:
- StopWatch a stopwatch that's already been started.
- Since:
- 3.5
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formatSplitTime
Returns the time formatted byDurationFormatUtils.formatDurationHMS(long)
.- Returns:
- the time formatted by
DurationFormatUtils.formatDurationHMS(long)
. - Since:
- 3.10
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formatTime
Returns the split time formatted byDurationFormatUtils.formatDurationHMS(long)
.- Returns:
- the split time formatted by
DurationFormatUtils.formatDurationHMS(long)
. - Since:
- 3.10
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getMessage
Gets the message for string presentation.- Returns:
- the message for string presentation.
- Since:
- 3.10
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getNanoTime
public long getNanoTime()Gets the elapsed time in nanoseconds.
This is either the time between the start and the moment this method is called, or the amount of time between start and stop.
- Returns:
- the elapsed time in nanoseconds.
- Since:
- 3.0
- See Also:
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getSplitNanoTime
public long getSplitNanoTime()Gets the split time in nanoseconds.
This is the time between start and latest split.
- Returns:
- the split time in nanoseconds
- Throws:
IllegalStateException
- if the StopWatch has not yet been split.- Since:
- 3.0
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getSplitTime
public long getSplitTime()Gets the split time on the stopwatch.
This is the time between start and latest split.
- Returns:
- the split time in milliseconds
- Throws:
IllegalStateException
- if the StopWatch has not yet been split.- Since:
- 2.1
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getStartTime
public long getStartTime()Gets the time this stopwatch was started in milliseconds, between the current time and midnight, January 1, 1970 UTC.- Returns:
- the time this stopwatch was started in milliseconds, between the current time and midnight, January 1, 1970 UTC.
- Throws:
IllegalStateException
- if this StopWatch has not been started- Since:
- 2.4
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getStopTime
public long getStopTime()Gets the time this stopwatch was stopped in milliseconds, between the current time and midnight, January 1, 1970 UTC.- Returns:
- the time this stopwatch was started in milliseconds, between the current time and midnight, January 1, 1970 UTC.
- Throws:
IllegalStateException
- if this StopWatch has not been started- Since:
- 3.12.0
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getTime
public long getTime()Gets the time on the stopwatch.
This is either the time between the start and the moment this method is called, or the amount of time between start and stop.
- Returns:
- the time in milliseconds
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getTime
Gets the time in the specified TimeUnit.
This is either the time between the start and the moment this method is called, or the amount of time between start and stop. The resulting time will be expressed in the desired TimeUnit with any remainder rounded down. For example, if the specified unit is
TimeUnit.HOURS
and the stopwatch time is 59 minutes, then the result returned will be0
.- Parameters:
timeUnit
- the unit of time, not null- Returns:
- the time in the specified TimeUnit, rounded down
- Since:
- 3.5
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isStarted
public boolean isStarted()Returns whether the StopWatch is started. A suspended StopWatch is also started watch.
- Returns:
- boolean If the StopWatch is started.
- Since:
- 3.2
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isStopped
public boolean isStopped()Returns whether StopWatch is stopped. The stopwatch which's not yet started and explicitly stopped stopwatch is considered as stopped.
- Returns:
- boolean If the StopWatch is stopped.
- Since:
- 3.2
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isSuspended
public boolean isSuspended()Returns whether the StopWatch is suspended.
- Returns:
- boolean If the StopWatch is suspended.
- Since:
- 3.2
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reset
public void reset()Resets the stopwatch. Stops it if need be.
This method clears the internal values to allow the object to be reused.
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resume
public void resume()Resumes the stopwatch after a suspend.
This method resumes the watch after it was suspended. The watch will not include time between the suspend and resume calls in the total time.
- Throws:
IllegalStateException
- if the StopWatch has not been suspended.
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split
public void split()Splits the time.
This method sets the stop time of the watch to allow a time to be extracted. The start time is unaffected, enabling
unsplit()
to continue the timing from the original start point.- Throws:
IllegalStateException
- if the StopWatch is not running.
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start
public void start()Starts the stopwatch.
This method starts a new timing session, clearing any previous values.
- Throws:
IllegalStateException
- if the StopWatch is already running.
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stop
public void stop()Stops the stopwatch.
This method ends a new timing session, allowing the time to be retrieved.
- Throws:
IllegalStateException
- if the StopWatch is not running.
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suspend
public void suspend()Suspends the stopwatch for later resumption.
This method suspends the watch until it is resumed. The watch will not include time between the suspend and resume calls in the total time.
- Throws:
IllegalStateException
- if the StopWatch is not currently running.
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toSplitString
Gets a summary of the split time that the stopwatch recorded as a string.
The format used is ISO 8601-like, [message ]hours:minutes:seconds.milliseconds.
- Returns:
- the split time as a String
- Since:
- 2.1, 3.10 Returns the prefix
"message "
if the message is set.
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toString
Gets a summary of the time that the stopwatch recorded as a string.
The format used is ISO 8601-like, [message ]hours:minutes:seconds.milliseconds.
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unsplit
public void unsplit()Removes a split.
This method clears the stop time. The start time is unaffected, enabling timing from the original start point to continue.
- Throws:
IllegalStateException
- if the StopWatch has not been split.
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