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jBasics is a collection of useful utility classes for Java. This includes helper for XML, mathematic functions, restful web services helper, pattern oriented programming interfaces and more. Currently Java7 and up is supported. Version 1.0 will required at leaset Java8.

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/*
 * Copyright (c) 2009-2015
 * 	IT-Consulting Stephan Schloepke (http://www.schloepke.de/)
 * 	klemm software consulting Mirko Klemm (http://www.klemm-scs.com/)
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 */
package org.jbasics.profile;

import java.util.HashMap;
import java.util.Map;
import java.util.concurrent.Callable;

public class TimeProfile {
	private static Map marked;
	private static long fixup;
	private final int iterations;

	public TimeProfile(int iterations) {
		if (iterations < 1) {
			this.iterations = 1;
		} else {
			this.iterations = iterations;
		}
	}

	public static void areaStart(String name) {
		long tmp = System.currentTimeMillis();
		if (marked == null) {
			return;
		}
		Area a = marked.get(name);
		if (a == null) {
			a = new Area();
			marked.put(name, a);
		}
		a.start();
		fixup += System.currentTimeMillis() - tmp;
	}

	public static void areaStop(String name) {
		long tmp = System.currentTimeMillis();
		if (marked == null) {
			return;
		}
		Area a = marked.get(name);
		if (a == null) {
			throw new IllegalStateException("Area not started so cannot stop " + name);
		}
		a.stop(tmp);
		fixup += System.currentTimeMillis() - tmp;
	}

	public Result profile(Callable proband) {
		try {
			proband.call();
		} catch (Exception e) {
			// ignore
		}
		marked = new HashMap();
		fixup = 0;
		long start = System.currentTimeMillis();
		for (int i = this.iterations; i > 0; i--) {
			try {
				proband.call();
			} catch (Exception e) {
				// ignore
			}
		}
		long end = System.currentTimeMillis();
		double total = (end - start - fixup) / (double) this.iterations;
		Map markedResult = null;
		if (!marked.isEmpty()) {
			markedResult = new HashMap();
			for (Map.Entry area : marked.entrySet()) {
				double areaTotal = area.getValue().getRuntime(end) / (double) this.iterations;
				markedResult.put(area.getKey(), Double.valueOf(Math.ceil(areaTotal * 1000) / 1000));
			}
		}
		return new Result(total, markedResult);
	}

	public static class Area {
		private long running;
		private long start;

		public void start() {
			if (this.start != 0) {
				throw new IllegalStateException("Probe problem");
			}
			this.start = System.currentTimeMillis();
		}

		public void stop() {
			if (this.start == 0) {
				throw new IllegalStateException("Probe problem");
			}
			this.running += System.currentTimeMillis() - this.start;
			this.start = 0;
		}

		public void stop(long time) {
			if (this.start == 0) {
				throw new IllegalStateException("Probe problem");
			}
			this.running += time - this.start;
			this.start = 0;
		}

		public long getRuntime() {
			if (this.start == 0) {
				return this.running;
			} else {
				return this.running + (System.currentTimeMillis() - this.start);
			}
		}

		public long getRuntime(long time) {
			if (this.start == 0) {
				return this.running;
			} else {
				return this.running + (time - this.start);
			}
		}
	}

	public static class Result {
		private final double total;
		private final Map areas;

		public Result(double total, Map areas) {
			this.total = total;
			this.areas = areas;
		}

		public double getTotal() {
			return this.total;
		}

		public String toString() {
			StringBuilder t = new StringBuilder();
			t.append(this.total).append("ms");
			if (this.areas != null) {
				t.append("(");
				for (Map.Entry area : this.areas.entrySet()) {
					t.append(area.getKey()).append(" = ").append(area.getValue()).append("ms, ");
				}
				t.setLength(t.length() - 2);
				t.append(")");
			}
			return t.toString();
		}
	}
}