A class that allows a programmer to determine the amount of time spend doing certain routines
/**
* Profiler.java Created Aug 14, 2006 by Andrew Butler, PSL
*/
//package prisms.util;
/**
* A class that allows a programmer to determine the amount of time spend doing
* certain routines
*/
public final class Profiler {
/**
* The static instance of Profiler, for ease of use
*/
public static final Profiler P = new Profiler("Main");
private String theName;
private String[] theRoutines;
private long[] theRoutineStartTimes;
private long[] theRoutineProfiles;
private int[] theCallCounts;
/**
* Creates a profiler
*
* @param name
* The name for the profiler
*/
public Profiler(String name) {
theName = name;
clearSession();
}
/**
* Starts a profiling session
*/
public void startSession() {
if (theRoutineStartTimes[0] >= 0)
throw new IllegalStateException("Profiler session \"" + theName
+ "\" is already running");
theRoutineStartTimes[0] = System.currentTimeMillis();
}
/**
* Stops the profiling session
*/
public void stopSession() {
long time = System.currentTimeMillis();
for (int i = 0; i < theRoutines.length; i++) {
if (theRoutineStartTimes[i] < 0)
continue;
theRoutineProfiles[i] += time - theRoutineStartTimes[i];
theRoutineStartTimes[i] = -1;
}
}
/**
* Removes all data from this Profiler, effectively starting over
*/
public void clearSession() {
theRoutines = new String[] { "Other" };
theRoutineStartTimes = new long[] { -1 };
theRoutineProfiles = new long[] { 0 };
theCallCounts = new int[] { 0 };
}
/**
* @return A string report showing the amount of time spent in the various
* routines since the session was cleared
*/
public String printReport() {
StringBuffer ret = new StringBuffer("Profile \"" + theName
+ "\" Report:\n");
int i;
for (i = 1; i < theRoutines.length; i++) {
ret.append(printProfile(i));
ret.append('\n');
}
ret.append(printProfile(0));
ret.append('\n');
return ret.toString();
}
private String printProfile(int i) {
StringBuffer ret = new StringBuffer(theRoutines[i]);
ret.append(": ");
if (i > 0) {
ret.append(theCallCounts[i]);
ret.append(" calls: ");
}
int days, hrs, mins, secs, millis;
long profile = theRoutineProfiles[i];
millis = (int) (profile % 1000);
profile /= 1000;
secs = (int) (profile % 60);
profile /= 60;
mins = (int) (profile % 60);
profile /= 60;
hrs = (int) (profile % 24);
profile /= 24;
days = (int) profile;
if (days > 0) {
ret.append(days);
ret.append(" days ");
}
if (hrs > 0) {
ret.append(hrs);
ret.append(" hours ");
}
if (mins > 0) {
ret.append(mins);
ret.append(" minutes ");
}
if (secs > 0) {
ret.append(secs);
ret.append(" seconds ");
}
if (millis > 0) {
ret.append(millis);
ret.append(" millis");
}
return ret.toString();
}
/**
* Notifies the profiler that a routine has started
*
* @param name
* The name of the routine
*/
public void startRoutine(String name) {
name = name.intern();
int i;
for (i = 1; i < theRoutines.length && name != theRoutines[i]; i++)
;
if (i == theRoutines.length) {
String[] newRoutines = new String[i + 1];
System.arraycopy(theRoutines, 0, newRoutines, 0, i);
newRoutines[i] = name;
theRoutines = newRoutines;
long[] longArray = new long[i + 1];
System.arraycopy(theRoutineStartTimes, 0, longArray, 0, i);
longArray[i] = -1;
theRoutineStartTimes = longArray;
longArray = new long[i + 1];
System.arraycopy(theRoutineProfiles, 0, longArray, 0, i);
longArray[i] = 0;
theRoutineProfiles = longArray;
int[] intArray = new int[i + 1];
System.arraycopy(theCallCounts, 0, intArray, 0, i);
intArray[i] = 0;
theCallCounts = intArray;
}
if (theRoutineStartTimes[i] >= 0) {
stopRoutine(name);
// throw new IllegalStateException("Routine " + name
// + " already running: recursion not supported");
}
long time = System.currentTimeMillis();
theRoutineStartTimes[i] = time;
theCallCounts[i]++;
if (theRoutineStartTimes[0] >= 0) { // Stop the "other" routine
theRoutineProfiles[0] += time - theRoutineStartTimes[0];
theRoutineStartTimes[0] = -1;
}
}
/**
* Notifies the profiler that a routine has ended
*
* @param name
* The name of the routine
*/
public void stopRoutine(String name) {
name = name.intern();
int i;
for (i = 1; i < theRoutines.length && name != theRoutines[i]; i++)
;
if (i == theRoutines.length || theRoutineStartTimes[i] < 0)
throw new IllegalStateException("Routine " + name
+ " is already finished or has not been started");
long time = System.currentTimeMillis();
theRoutineProfiles[i] += time - theRoutineStartTimes[i];
theRoutineStartTimes[i] = -1;
for (i = 1; i < theRoutines.length && theRoutineStartTimes[i] < 0; i++)
;
if (i == theRoutines.length)
theRoutineStartTimes[0] = time;
}
}
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