//
// 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 com.cloud.utils;
public class Profiler {
private static final long MILLIS_FACTOR = 1000l;
private static final double EXPONENT = 2d;
private Long startTickNanoSeconds;
private Long stopTickNanoSeconds;
public long start() {
startTickNanoSeconds = System.nanoTime();
return startTickNanoSeconds;
}
public long stop() {
stopTickNanoSeconds = System.nanoTime();
return stopTickNanoSeconds;
}
/**
* 1 millisecond = 1e+6 nanoseconds
* 1 second = 1000 milliseconds = 1e+9 nanoseconds
*
* @return the duration in nanoseconds.
*/
public long getDuration() {
if (startTickNanoSeconds != null && stopTickNanoSeconds != null) {
return stopTickNanoSeconds - startTickNanoSeconds;
}
return -1;
}
/**
* 1 millisecond = 1e+6 nanoseconds
* 1 second = 1000 millisecond = 1e+9 nanoseconds
*
* @return the duration in milliseconds.
*/
public long getDurationInMillis() {
if (startTickNanoSeconds != null && stopTickNanoSeconds != null) {
return (stopTickNanoSeconds - startTickNanoSeconds) / (long)Math.pow(MILLIS_FACTOR, EXPONENT);
}
return -1;
}
public boolean isStarted() {
return startTickNanoSeconds != null;
}
public boolean isStopped() {
return stopTickNanoSeconds != null;
}
@Override
public String toString() {
if (startTickNanoSeconds == null) {
return "Not Started";
}
if (stopTickNanoSeconds == null) {
return "Started but not stopped";
}
return "Done. Duration: " + getDurationInMillis() + "ms";
}
}