package com.profile;

import java.util.Collections;
import java.util.HashMap;
import java.util.Map;

public class Profiler 
{
	
	private static final Map<ProfilerID, TimerClass> timers = Collections.synchronizedMap(new HashMap<ProfilerID, TimerClass>());

	
	private static int idCount = 0;
	
	public static ProfilerID start(String className, String methodName) {
		ProfilerID id = new ProfilerID(idCount++, className, methodName);
		TimerClass timer = new TimerClass();
		timer.start();
		timers.put(id, timer);
		return id;
	}

    public static void end(ProfilerID id) {
    	TimerClass timer = timers.remove(id);
        timer.stop();
        System.out.println(id + " took " + timer.getTotalTimeMillis() + "ms");
    }
    
    public static class ProfilerID
	{
		private final int id;
		private final String className;
		private final String methodName;
		
		private ProfilerID(int id, String className, String methodName) {
			this.id = id;
			this.className = className;
			this.methodName = methodName;
		}
		
		@Override
		public String toString() {
			return className + "." + methodName;
		}
	}
}