| /* |
| * Licensed to the Apache Software Foundation (ASF) under one or more |
| * contributor license agreements. See the NOTICE file distributed with |
| * this work for additional information regarding copyright ownership. |
| * The ASF licenses this file to You under the Apache License, Version 2.0 |
| * (the "License"); you may not use this file except in compliance with |
| * the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * 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> |
| * 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 #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> |
| * 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 /> |
| * 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> |
| * |
| * @author Stephen Colebourne |
| * @since 2.0 |
| * @version $Id$ |
| */ |
| 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; |
| |
| /** |
| * The current running state of the StopWatch. |
| */ |
| private int runningState = STATE_UNSTARTED; |
| |
| /** |
| * Whether the stopwatch has a split time recorded. |
| */ |
| private int splitState = STATE_UNSPLIT; |
| |
| /** |
| * The start time. |
| */ |
| private long startTime = -1; |
| |
| /** |
| * The stop time. |
| */ |
| private long stopTime = -1; |
| |
| /** |
| * <p> |
| * Constructor. |
| * </p> |
| */ |
| public StopWatch() { |
| super(); |
| } |
| |
| /** |
| * <p> |
| * Start the stopwatch. |
| * </p> |
| * |
| * <p> |
| * This method starts a new timing session, clearing any previous values. |
| * </p> |
| * |
| * @throws IllegalStateException |
| * if the StopWatch is already running. |
| */ |
| public void start() { |
| if (this.runningState == STATE_STOPPED) { |
| throw new IllegalStateException("Stopwatch must be reset before being restarted. "); |
| } |
| if (this.runningState != STATE_UNSTARTED) { |
| throw new IllegalStateException("Stopwatch already started. "); |
| } |
| this.stopTime = -1; |
| this.startTime = System.currentTimeMillis(); |
| this.runningState = STATE_RUNNING; |
| } |
| |
| /** |
| * <p> |
| * Stop the stopwatch. |
| * </p> |
| * |
| * <p> |
| * This method ends a new timing session, allowing the time to be retrieved. |
| * </p> |
| * |
| * @throws IllegalStateException |
| * if the StopWatch is not running. |
| */ |
| public void stop() { |
| if (this.runningState != STATE_RUNNING && this.runningState != STATE_SUSPENDED) { |
| throw new IllegalStateException("Stopwatch is not running. "); |
| } |
| if (this.runningState == STATE_RUNNING) { |
| this.stopTime = System.currentTimeMillis(); |
| } |
| this.runningState = STATE_STOPPED; |
| } |
| |
| /** |
| * <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> |
| */ |
| public void reset() { |
| this.runningState = STATE_UNSTARTED; |
| this.splitState = STATE_UNSPLIT; |
| this.startTime = -1; |
| this.stopTime = -1; |
| } |
| |
| /** |
| * <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> |
| * |
| * @throws IllegalStateException |
| * if the StopWatch is not running. |
| */ |
| public void split() { |
| if (this.runningState != STATE_RUNNING) { |
| throw new IllegalStateException("Stopwatch is not running. "); |
| } |
| this.stopTime = System.currentTimeMillis(); |
| this.splitState = STATE_SPLIT; |
| } |
| |
| /** |
| * <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> |
| * |
| * @throws IllegalStateException |
| * if the StopWatch has not been split. |
| */ |
| public void unsplit() { |
| if (this.splitState != STATE_SPLIT) { |
| throw new IllegalStateException("Stopwatch has not been split. "); |
| } |
| this.stopTime = -1; |
| this.splitState = STATE_UNSPLIT; |
| } |
| |
| /** |
| * <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> |
| * |
| * @throws IllegalStateException |
| * if the StopWatch is not currently running. |
| */ |
| public void suspend() { |
| if (this.runningState != STATE_RUNNING) { |
| throw new IllegalStateException("Stopwatch must be running to suspend. "); |
| } |
| this.stopTime = System.currentTimeMillis(); |
| this.runningState = STATE_SUSPENDED; |
| } |
| |
| /** |
| * <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> |
| * |
| * @throws IllegalStateException |
| * if the StopWatch has not been suspended. |
| */ |
| public void resume() { |
| if (this.runningState != STATE_SUSPENDED) { |
| throw new IllegalStateException("Stopwatch must be suspended to resume. "); |
| } |
| this.startTime += (System.currentTimeMillis() - this.stopTime); |
| this.stopTime = -1; |
| this.runningState = STATE_RUNNING; |
| } |
| |
| /** |
| * <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> |
| * |
| * @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) { |
| return 0; |
| } 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> |
| * 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. |
| * @since 2.1 |
| */ |
| public long getSplitTime() { |
| if (this.splitState != STATE_SPLIT) { |
| throw new IllegalStateException("Stopwatch must be split to get the split time. "); |
| } |
| return this.stopTime - this.startTime; |
| } |
| |
| /** |
| * Returns the time this stopwatch was started. |
| * |
| * @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 |
| */ |
| public String toString() { |
| return DurationFormatUtils.formatDurationHMS(getTime()); |
| } |
| |
| /** |
| * <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> |
| * |
| * @return the split time as a String |
| * @since 2.1 |
| */ |
| public String toSplitString() { |
| return DurationFormatUtils.formatDurationHMS(getSplitTime()); |
| } |
| |
| } |