Source Code Cross Referenced for StopWatch.java in  » Database-DBMS » hsql » org » hsqldb » lib » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Database DBMS » hsql » org.hsqldb.lib 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /* Copyright (c) 2001-2005, The HSQL Development Group
002:         * All rights reserved.
003:         *
004:         * Redistribution and use in source and binary forms, with or without
005:         * modification, are permitted provided that the following conditions are met:
006:         *
007:         * Redistributions of source code must retain the above copyright notice, this
008:         * list of conditions and the following disclaimer.
009:         *
010:         * Redistributions in binary form must reproduce the above copyright notice,
011:         * this list of conditions and the following disclaimer in the documentation
012:         * and/or other materials provided with the distribution.
013:         *
014:         * Neither the name of the HSQL Development Group nor the names of its
015:         * contributors may be used to endorse or promote products derived from this
016:         * software without specific prior written permission.
017:         *
018:         * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
019:         * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
020:         * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
021:         * ARE DISCLAIMED. IN NO EVENT SHALL HSQL DEVELOPMENT GROUP, HSQLDB.ORG,
022:         * OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
023:         * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
024:         * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
025:         * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
026:         * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
027:         * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
028:         * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
029:         */
030:
031:        package org.hsqldb.lib;
032:
033:        /**
034:         * Provides the programatic analog of a physical stop watch. <p>
035:         *
036:         * The watch can be started, stopped and zeroed and can be queried for
037:         * elapsed running time.  The watch accumulates elapsed time over starts
038:         * and stops such that only the time actually spent running is recorded.
039:         * If the watch is zeroed, then the accumulated time is discarded and
040:         * the watch starts again with zero acumulated time. <p>
041:         *
042:         * @author boucherb@users
043:         * @version 1.7.2
044:         * @since 1.7.2
045:         */
046:        public class StopWatch {
047:
048:            /**
049:             * The last time this object made the transition
050:             * from stopped to running state, as reported
051:             * by System.currentTimeMillis().
052:             */
053:            private long startTime;
054:            private long lastStart;
055:
056:            /**
057:             * The accumulated running time of this object since
058:             * it was last zeroed.
059:             */
060:            private long total;
061:
062:            /** Flags if this object is started or stopped. */
063:            boolean running = false;
064:
065:            /** Creates, zeros, and starts a new StopWatch */
066:            public StopWatch() {
067:                this (true);
068:            }
069:
070:            /** Creates, zeros, and starts a new StopWatch */
071:            public StopWatch(boolean start) {
072:
073:                if (start) {
074:                    start();
075:                }
076:            }
077:
078:            /**
079:             * Retrieves the accumulated time this object has spent running since
080:             * it was last zeroed.
081:             * @return the accumulated time this object has spent running since
082:             * it was last zeroed.
083:             */
084:            public long elapsedTime() {
085:
086:                if (running) {
087:                    return total + System.currentTimeMillis() - startTime;
088:                } else {
089:                    return total;
090:                }
091:            }
092:
093:            /**
094:             * Retrieves the accumulated time this object has spent running since
095:             * it was last started.
096:             * @return the accumulated time this object has spent running since
097:             * it was last started.
098:             */
099:            public long currentElapsedTime() {
100:
101:                if (running) {
102:                    return System.currentTimeMillis() - startTime;
103:                } else {
104:                    return 0;
105:                }
106:            }
107:
108:            /** Zeros accumulated running time and restarts this object. */
109:            public void zero() {
110:
111:                total = 0;
112:
113:                start();
114:            }
115:
116:            /**
117:             * Ensures that this object is in the running state.  If this object is not
118:             * running, then the call has the effect of setting the <code>startTime</code>
119:             * attribute to the current value of System.currentTimeMillis() and setting
120:             * the <code>running</code> attribute to <code>true</code>.
121:             */
122:            public void start() {
123:                startTime = System.currentTimeMillis();
124:                running = true;
125:            }
126:
127:            /**
128:             * Ensures that this object is in the stopped state.  If this object is
129:             * in the running state, then this has the effect of adding to the
130:             * <code>total</code> attribute the elapsed time since the last transition
131:             * from stopped to running state and sets the <code>running</code> attribute
132:             * to false. If this object is not in the running state, this call has no
133:             * effect.
134:             */
135:            public void stop() {
136:
137:                if (running) {
138:                    total += System.currentTimeMillis() - startTime;
139:                    running = false;
140:                }
141:            }
142:
143:            public void mark() {
144:                stop();
145:                start();
146:            }
147:
148:            /**
149:             * Retrieves prefix + " in " + elapsedTime() + " ms."
150:             * @param prefix The string to use as a prefix
151:             * @return prefix + " in " + elapsedTime() + " ms."
152:             */
153:            public String elapsedTimeToMessage(String prefix) {
154:                return prefix + " in " + elapsedTime() + " ms.";
155:            }
156:
157:            /**
158:             * Retrieves prefix + " in " + elapsedTime() + " ms."
159:             * @param prefix The string to use as a prefix
160:             * @return prefix + " in " + elapsedTime() + " ms."
161:             */
162:            public String currentElapsedTimeToMessage(String prefix) {
163:                return prefix + " in " + currentElapsedTime() + " ms.";
164:            }
165:
166:            /**
167:             * Retrieves the internal state of this object, as a String.
168:             *
169:             * The retreived value is:
170:             *
171:             * <pre>
172:             *    super.toString() +
173:             *    "[running=" +
174:             *    running +
175:             *    ", startTime=" +
176:             *    startTime +
177:             *    ", total=" +
178:             *    total + "]";
179:             * </pre>
180:             * @return the state of this object, as a String
181:             */
182:            public String toString() {
183:                return super .toString() + "[running=" + running
184:                        + ", startTime=" + startTime + ", total=" + total + "]";
185:            }
186:        }
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