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57 package performance;
58
59 import java.text.DecimalFormat  ;
60 import java.util.ArrayList ;
61 import java.util.Collections ;
62 import java.util.HashMap ;
63 import java.util.Iterator ;
64
65
70 public class Monitor {
71
72 static HashMap timers = new HashMap ();
73
74 public static void start(String s) {
75 Timer t = (Timer)timers.get( s );
76 if ( t == null ) {
77 t = new Timer();
78 timers.put( s, t );
79 }
80 t.start();
81 }
82
83 public static void stop(String s) {
84 Timer t = (Timer)timers.get( s );
85 t.stop();
86 }
87
88 public static void pause(String s) {
89 Timer t = (Timer)timers.get( s );
90 if ( t != null ) {
91 t.pause();
92 }
93 }
94
95 public static void resume(String s) {
96 Timer t = (Timer)timers.get( s );
97 if ( t != null ) {
98 t.resume();
99 }
100 }
101
102 public static void clear() {
103 timers = new HashMap ();
104 }
105
106 public static HashMap getAvgResults() {
107 Timer t;
108 String testName;
109 HashMap results = new HashMap ();
110 for (Iterator i = timers.keySet().iterator(); i.hasNext(); ) {
111 testName = (String )i.next();
112 t = (Timer)timers.get( testName );
113 float f1 = t.getAvgTime();
114 Float f = new Float ( t.getAvgTime() );
115 results.put( testName, new Float ( t.getAvgTime() ) );
116 }
117 return results;
118 }
119
120 public static void printResults() {
121 Timer t;
122 String testName;
123 float value;
124 ArrayList l = new ArrayList ();
125 for (Iterator i = timers.keySet().iterator(); i.hasNext(); ) {
126 l.add( i.next() );
127 }
128
129 Collections.sort( l );
130 DecimalFormat formatter = new DecimalFormat ("#0.00000");
131
132 System.out.println( "\n=== Monitor Results ===\n" );
133 for (Iterator i = l.iterator(); i.hasNext(); ) {
134 testName = (String )i.next();
135 t = (Timer)timers.get( testName );
136 System.out.println( pad(testName,40) +
138 " value=" + lpad(formatter.format( t.getAvgTime() ),8) + " msecs" +
139 ", samples= " + lpad( ""+t.getIterations(), 8 ) );
140 }
141 System.out.println();
142 }
143
144 public static String pad(String s, int pad) {
145 if ( s==null ) s = "";
146 StringBuffer sb = new StringBuffer ( pad );
147 for (int i = 0; i < (pad-s.length()); i++) {
148 sb = sb.append( " " );
149 }
150 return s + sb.toString();
151 }
152
153 public static String lpad(String s, int pad) {
154 if ( s==null ) s = "";
155 StringBuffer sb = new StringBuffer ( pad );
156 for (int i = 0; i < (pad-s.length()); i++) {
157 sb = sb.append( " " );
158 }
159 return sb.toString() + s;
160 }
161
162 }
163
164 class Timer {
165
166 long start;
167 long interval;
168 long totalTime;
169 int startCount;
170 long minimumInterval, errorInterval;
171 static final long CLOCK_ACCURACY = 10;
173 public Timer() {
174 interval = 0;
175 totalTime = 0;
176 startCount = 0;
177 minimumInterval = Long.MAX_VALUE;
178 errorInterval = Long.MAX_VALUE;
179 }
180
181 public void start() {
182 interval = 0;
183 startCount +=1;
184 totalTime += interval;
185 start = System.currentTimeMillis();
186 }
187
188 public void pause() {
189 interval += System.currentTimeMillis() - start;
190 start = 0;
191 }
192
193 public void resume() {
194 start = System.currentTimeMillis();
195 }
196
197 public void stop() {
198 long thisInterval = System.currentTimeMillis() - start;
199 if ( thisInterval > errorInterval ) {
200 startCount-=1; } else {
202 interval += thisInterval;
203 totalTime += thisInterval;
204 if ( startCount > 1 && minimumInterval > 0 && interval < minimumInterval ) {
205 minimumInterval = interval;
206 errorInterval = minimumInterval + CLOCK_ACCURACY;
207 startCount = 0;
208 totalTime = 0;
209 }
210 }
211 }
212
213 public long getInterval() {
214 return interval;
215 }
216
217 public float getAvgTime() {
218 return (float)totalTime / startCount;
219 }
220
221 public int getIterations() {
222 return startCount;
223 }
224
225 }
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Java API By Example, From Geeks To Geeks.