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[LANG-356] Add getStartTime to StopWatch. 

git-svn-id: https://svn.apache.org/repos/asf/commons/proper/lang/trunk@583605 13f79535-47bb-0310-9956-ffa450edef68
This commit is contained in:
Gary D. Gregory 2007-10-10 20:31:17 +00:00
parent 60fe05eb7a
commit 15296e0664
2 changed files with 187 additions and 87 deletions
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191
src/java/org/apache/commons/lang/time/StopWatch.java
View File

@ -14,34 +14,41 @@
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.commons.lang.time;
/**
* <p><code>StopWatch</code> provides a convenient API for timings.</p>
* <p>
* <code>StopWatch</code> provides a convenient API for timings.
* </p>
*
* <p>To start the watch, call {@link #start()}. At this point you can:</p>
* <p>
* To start the watch, call {@link #start()}. At this point you can:
* </p>
* <ul>
* <li>{@link #split()} the watch to get the time whilst the watch continues in the
* background. {@link #unsplit()} will remove the effect of the split. At this point,
* these three options are available again.</li>
* <li>{@link #suspend()} the watch to pause it. {@link #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.</li>
* <li>{@link #split()} the watch to get the time whilst the watch continues in the background. {@link #unsplit()} will
* remove the effect of the split. At this point, these three options are available again.</li>
* <li>{@link #suspend()} the watch to pause it. {@link #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.</li>
* <li>{@link #stop()} the watch to complete the timing session.</li>
* </ul>
*
* <p>It is intended that the output methods {@link #toString()} and {@link #getTime()}
* should only be called after stop, split or suspend, however a suitable result will
* be returned at other points.</p>
* <p>
* It is intended that the output methods {@link #toString()} and {@link #getTime()} should only be called after stop,
* split or suspend, however a suitable result will be returned at other points.
* </p>
*
* <p>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.</p>
* <p>
* 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.
* </p>
*
* <p>1. split(), suspend(), or stop() cannot be invoked twice<br />
* <p>
* 1. split(), suspend(), or stop() cannot be invoked twice<br />
* 2. unsplit() may only be called if the watch has been split()<br />
* 3. resume() may only be called if the watch has been suspend()<br />
* 4. start() cannot be called twice without calling reset()</p>
* 4. start() cannot be called twice without calling reset()
* </p>
*
* @author Stephen Colebourne
* @since 2.0
@ -51,12 +58,16 @@ public class StopWatch {
// running states
private static final int STATE_UNSTARTED = 0;
private static final int STATE_RUNNING = 1;
private static final int STATE_STOPPED = 2;
private static final int STATE_SUSPENDED = 3;
// split state
private static final int STATE_UNSPLIT = 10;
private static final int STATE_SPLIT = 11;
/**
@ -73,24 +84,32 @@ public class StopWatch {
* The start time.
*/
private long startTime = -1;
/**
* The stop time.
*/
private long stopTime = -1;
/**
* <p>Constructor.</p>
* <p>
* Constructor.
* </p>
*/
public StopWatch() {
super();
}
/**
* <p>Start the stopwatch.</p>
* <p>
* Start the stopwatch.
* </p>
*
* <p>This method starts a new timing session, clearing any previous values.</p>
* <p>
* This method starts a new timing session, clearing any previous values.
* </p>
*
* @throws IllegalStateException if the StopWatch is already running.
* @throws IllegalStateException
* if the StopWatch is already running.
*/
public void start() {
if (this.runningState == STATE_STOPPED) {
@ -105,11 +124,16 @@ public class StopWatch {
}
/**
* <p>Stop the stopwatch.</p>
* <p>
* Stop the stopwatch.
* </p>
*
* <p>This method ends a new timing session, allowing the time to be retrieved.</p>
* <p>
* This method ends a new timing session, allowing the time to be retrieved.
* </p>
*
* @throws IllegalStateException if the StopWatch is not running.
* @throws IllegalStateException
* if the StopWatch is not running.
*/
public void stop() {
if (this.runningState != STATE_RUNNING && this.runningState != STATE_SUSPENDED) {
@ -122,9 +146,13 @@ public class StopWatch {
}
/**
* <p>Resets the stopwatch. Stops it if need be. </p>
* <p>
* Resets the stopwatch. Stops it if need be.
* </p>
*
* <p>This method clears the internal values to allow the object to be reused.</p>
* <p>
* This method clears the internal values to allow the object to be reused.
* </p>
*/
public void reset() {
this.runningState = STATE_UNSTARTED;
@ -134,13 +162,17 @@ public class StopWatch {
}
/**
* <p>Split the time.</p>
* <p>
* Split the time.
* </p>
*
* <p>This method sets the stop time of the watch to allow a time to be extracted.
* The start time is unaffected, enabling {@link #unsplit()} to continue the
* timing from the original start point.</p>
* <p>
* This method sets the stop time of the watch to allow a time to be extracted. The start time is unaffected,
* enabling {@link #unsplit()} to continue the timing from the original start point.
* </p>
*
* @throws IllegalStateException if the StopWatch is not running.
* @throws IllegalStateException
* if the StopWatch is not running.
*/
public void split() {
if (this.runningState != STATE_RUNNING) {
@ -151,12 +183,17 @@ public class StopWatch {
}
/**
* <p>Remove a split.</p>
* <p>
* Remove a split.
* </p>
*
* <p>This method clears the stop time. The start time is unaffected, enabling
* timing from the original start point to continue.</p>
* <p>
* This method clears the stop time. The start time is unaffected, enabling timing from the original start point to
* continue.
* </p>
*
* @throws IllegalStateException if the StopWatch has not been split.
* @throws IllegalStateException
* if the StopWatch has not been split.
*/
public void unsplit() {
if (this.splitState != STATE_SPLIT) {
@ -167,12 +204,17 @@ public class StopWatch {
}
/**
* <p>Suspend the stopwatch for later resumption.</p>
* <p>
* Suspend the stopwatch for later resumption.
* </p>
*
* <p>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.</p>
* <p>
* 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.
* </p>
*
* @throws IllegalStateException if the StopWatch is not currently running.
* @throws IllegalStateException
* if the StopWatch is not currently running.
*/
public void suspend() {
if (this.runningState != STATE_RUNNING) {
@ -183,12 +225,17 @@ public class StopWatch {
}
/**
* <p>Resume the stopwatch after a suspend.</p>
* <p>
* Resume the stopwatch after a suspend.
* </p>
*
* <p>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.</p>
* <p>
* 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.
* </p>
*
* @throws IllegalStateException if the StopWatch has not been suspended.
* @throws IllegalStateException
* if the StopWatch has not been suspended.
*/
public void resume() {
if (this.runningState != STATE_SUSPENDED) {
@ -200,34 +247,41 @@ public class StopWatch {
}
/**
* <p>Get the time on the stopwatch.</p>
* <p>
* Get the time on the stopwatch.
* </p>
*
* <p>This is either the time between the start and the moment this method
* is called, or the amount of time between start and stop.</p>
* <p>
* This is either the time between the start and the moment this method is called, or the amount of time between
* start and stop.
* </p>
*
* @return the time in milliseconds
*/
public long getTime() {
if (this.runningState == STATE_STOPPED || this.runningState == STATE_SUSPENDED) {
return this.stopTime - this.startTime;
} else
if(this.runningState == STATE_UNSTARTED) {
} else if (this.runningState == STATE_UNSTARTED) {
return 0;
} else
if(this.runningState == STATE_RUNNING) {
} else if (this.runningState == STATE_RUNNING) {
return System.currentTimeMillis() - this.startTime;
}
throw new RuntimeException("Illegal running state has occured. ");
}
/**
* <p>Get the split time on the stopwatch.</p>
* <p>
* Get the split time on the stopwatch.
* </p>
*
* <p>This is the time between start and latest split. </p>
* <p>
* This is the time between start and latest split.
* </p>
*
* @return the split time in milliseconds
*
* @throws IllegalStateException if the StopWatch has not yet been split.
* @throws IllegalStateException
* if the StopWatch has not yet been split.
* @since 2.1
*/
public long getSplitTime() {
@ -238,10 +292,28 @@ public class StopWatch {
}
/**
* <p>Gets a summary of the time that the stopwatch recorded as a string.</p>
* Returns the time this stopwatch was started.
*
* <p>The format used is ISO8601-like,
* <i>hours</i>:<i>minutes</i>:<i>seconds</i>.<i>milliseconds</i>.</p>
* @return the time this stopwatch was started
* @throws IllegalStateException
* if this StopWatch has not been started
* @since 2.4
*/
public long getStartTime() {
if (this.runningState == STATE_UNSTARTED) {
throw new IllegalStateException("Stopwatch has not been started");
}
return this.startTime;
}
/**
* <p>
* Gets a summary of the time that the stopwatch recorded as a string.
* </p>
*
* <p>
* The format used is ISO8601-like, <i>hours</i>:<i>minutes</i>:<i>seconds</i>.<i>milliseconds</i>.
* </p>
*
* @return the time as a String
*/
@ -250,10 +322,13 @@ public class StopWatch {
}
/**
* <p>Gets a summary of the split time that the stopwatch recorded as a string.</p>
* <p>
* Gets a summary of the split time that the stopwatch recorded as a string.
* </p>
*
* <p>The format used is ISO8601-like,
* <i>hours</i>:<i>minutes</i>:<i>seconds</i>.<i>milliseconds</i>.</p>
* <p>
* The format used is ISO8601-like, <i>hours</i>:<i>minutes</i>:<i>seconds</i>.<i>milliseconds</i>.
* </p>
*
* @return the split time as a String
* @since 2.1

25
src/test/org/apache/commons/lang/time/StopWatchTest.java
View File

@ -16,6 +16,7 @@
*/
package org.apache.commons.lang.time;
import junit.framework.Assert;
import junit.framework.Test;
import junit.framework.TestCase;
import junit.framework.TestSuite;
@ -203,7 +204,31 @@ public class StopWatchTest extends TestCase {
} catch(IllegalStateException ise) {
// expected
}
}
public void testGetStartTime() {
long beforeStopWatch = System.currentTimeMillis();
StopWatch watch = new StopWatch();
try {
watch.getStartTime();
fail("Calling getStartTime on an unstarted StopWatch should throw an exception");
} catch (IllegalStateException expected) {
// expected
}
watch.start();
try {
watch.getStartTime();
Assert.assertTrue(watch.getStartTime() >= beforeStopWatch);
} catch (IllegalStateException ex) {
fail("Start time should be available: " + ex.getMessage());
}
watch.reset();
try {
watch.getStartTime();
fail("Calling getStartTime on a reset, but unstarted StopWatch should throw an exception");
} catch (IllegalStateException expected) {
// expected
}
}
}