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* obtain a copy of the License at
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// Portions Copyright [2019] Payara Foundation and/or affiliates
package com.sun.jdo.api.persistence.enhancer.util;
import java.io.PrintWriter;
import java.text.DecimalFormat;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Comparator;
import java.util.HashMap;
/**
* Utility class for simple performance analysis.
*/
//@olsen: added class
public final class Timer {
// a method's timing descriptor
static private class MethodDescriptor {
final String name;
int instantiations;
int calls;
long self;
long total;
MethodDescriptor(String name) {
this.name = name;
}
}
// a method call's timing descriptor
static private class MethodCall {
final MethodDescriptor method;
final String message;
long self;
long total;
MethodCall(MethodDescriptor method,
String message,
long self,
long total) {
this.method = method;
this.message = message;
this.self = self;
this.total = total;
}
}
// output device
PrintWriter out = new PrintWriter(System.out, true);
// methods
HashMap methods = new HashMap();
// method call stack
private final ArrayList calls = new ArrayList(16);
public Timer()
{
}
public Timer(PrintWriter out)
{
this.out = out;
}
public final synchronized void push(String name) {
push(name, name);
}
public final synchronized void push(String name, String message) {
// get time
final long now = System.currentTimeMillis();
// get a method descriptor
MethodDescriptor current = (MethodDescriptor)methods.get(name);
if (current == null) {
current = new MethodDescriptor(name);
methods.put(name, current);
}
// update method descriptor
current.calls++;
current.instantiations++;
// update method call stack
calls.add(new MethodCall(current, message, now, now));
}
public final synchronized void pop()
{
// get time
final long now = System.currentTimeMillis();
// update method call stack
final MethodCall call = (MethodCall)calls.remove(calls.size()-1);
// get current call's time
final long currentSelf = now - call.self;
final long currentTotal = now - call.total;
// update previous call's self time
if (calls.size() > 0) {
final MethodCall previous = (MethodCall)calls.get(calls.size()-1);
previous.self += currentTotal;
}
// update method descriptor
final MethodDescriptor current = call.method;
current.self += currentSelf;
if (--current.instantiations == 0) {
current.total += currentTotal;
}
if (false) {
out.println("Timer (n,g): " + call.message + " : ("
+ currentSelf + ", " + currentTotal + ")");
}
}
static private final String pad(String s, int i)
{
StringBuilder b = new StringBuilder();
for (i -= s.length(); i > 0; i--)
b.append((char)' ');
b.append(s);
return b.toString();
}
public final synchronized void print()
{
out.println("Timer : printing accumulated times ...");
final Object[] calls = methods.values().toArray();
Arrays.sort(calls,
new Comparator() {
public int compare(Object o1,
Object o2) {
return (int)(((MethodDescriptor)o2).total
- ((MethodDescriptor)o1).total);
}
public boolean equals(Object obj) {
return (obj != null && compare(this, obj) == 0);
}
});
out.println("Timer : total s self s #calls name");
DecimalFormat nf = new DecimalFormat();
nf.setMaximumFractionDigits(2);
nf.setMinimumFractionDigits(2);
//nf.applyPattern("#,##0.00");
//out.println("Timer : pattern = " + nf.toPattern());
for (int i = 0; i < calls.length; i++) {
final MethodDescriptor current = (MethodDescriptor)calls[i];
out.println("Timer : "
+ pad(nf.format(current.total / 1000.0), 8) + " "
+ pad(nf.format(current.self / 1000.0), 8) + " "
+ pad(String.valueOf(current.calls), 6) + " "
+ current.name);
}
}
}
