org.eclipse.osbp.xtext.oxtype/src/org/eclipse/osbp/xtext/oxtype/resource/DerivedStateMetric.java

package org.eclipse.osbp.xtext.oxtype.resource;

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

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

public class DerivedStateMetric {

	private static final Logger LOGGER = LoggerFactory
			.getLogger(DerivedStateMetric.class);

	Map<String, Data> cache = new HashMap<>();

	static final DerivedStateMetric INSTANCE = new DerivedStateMetric();

	public static DerivedStateMetric getInstance() {
		return INSTANCE;
	}

	private DerivedStateMetric() {

	}

	public void addMetric(String key, long timeExecuteState) {
		Data data = cache.get(key);
		if (data == null) {
			data = new Data(key);
			cache.put(key, data);
		}

		data.add(timeExecuteState);
	}

	public void print() {
		List<Map.Entry<String, Data>> values = new ArrayList<>(cache.entrySet());
		Collections.sort(values,
				(o1, o2) -> {
					return (int) (o2.getValue().timeExecuteStateSum - o1
							.getValue().timeExecuteStateSum);
				});

		for (Map.Entry<String, Data> entry : values) {
			System.out.println(entry.getValue().toString());
		}
	}

	public void clear() {
		cache.clear();
	}

	static class Data {
		final String key;
		int count;
		long timeExecuteStateSum = 0;
		long avgTime;

		public Data(String key) {
			this.key = key;
		}

		public void add(long timeExecuteState) {
			this.count++;
			this.timeExecuteStateSum += timeExecuteState;
			this.avgTime = timeExecuteStateSum / count;
		}

		@Override
		public String toString() {
			return "Data [key=" + key + ", count=" + count
					+ " timeExecuteStateSum=" + timeExecuteStateSum
					+ "ms, avgTime=" + avgTime + "ms]";
		}
	}
}