| /* |
| * Licensed to the Apache Software Foundation (ASF) under one or more |
| * contributor license agreements. See the NOTICE file distributed with |
| * this work for additional information regarding copyright ownership. |
| * The ASF licenses this file to You under the Apache License, Version 2.0 |
| * (the "License"); you may not use this file except in compliance with |
| * the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| package org.apache.jackrabbit.oak.commons; |
| |
| import java.util.LinkedList; |
| import java.util.List; |
| |
| /** |
| * {@code DebugTimer}... |
| */ |
| public class DebugTimer { |
| |
| private static String[] units = {"ns", "us", "ms", "s"}; |
| |
| private List<TimeStamp> timestamps = new LinkedList<TimeStamp>(); |
| |
| private long now; |
| |
| public DebugTimer() { |
| now = System.nanoTime(); |
| } |
| |
| public void mark(String msg) { |
| long then = now; |
| now = System.nanoTime(); |
| timestamps.add(new TimeStamp(now-then, msg)); |
| } |
| |
| public String getString() { |
| if (timestamps.isEmpty()) { |
| return ""; |
| } |
| StringBuilder b = new StringBuilder(); |
| for (TimeStamp t: timestamps) { |
| if (b.length() > 0) { |
| b.append(", "); |
| } else { |
| b.append('('); |
| } |
| int u = 0; |
| double time = t.time; |
| while (time > 1000 && u<units.length-1) { |
| time = time / 1000; |
| u++; |
| } |
| b.append(String.format("%s=%.2f%s", t.msg, time, units[u])); |
| } |
| return b.append(')').toString(); |
| } |
| |
| private static final class TimeStamp { |
| |
| private final long time; |
| |
| private final String msg; |
| |
| private TimeStamp(long time, String msg) { |
| this.time = time; |
| this.msg = msg; |
| } |
| } |
| } |