| /* |
| * Copyright 2009-2010 by The Regents of the University of California |
| * Licensed 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 from |
| * |
| * 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 edu.uci.ics.hyracks.control.common.job.profiling.counters; |
| |
| import java.io.Serializable; |
| |
| public class MultiResolutionEventProfiler implements Serializable { |
| private static final long serialVersionUID = 1L; |
| |
| private final int[] times; |
| |
| private long offset; |
| |
| private int ptr; |
| |
| private int resolution; |
| |
| private int eventCounter; |
| |
| public MultiResolutionEventProfiler(int nSamples) { |
| times = new int[nSamples]; |
| offset = -1; |
| ptr = 0; |
| resolution = 1; |
| eventCounter = 0; |
| } |
| |
| public void reportEvent() { |
| ++eventCounter; |
| if (eventCounter % resolution != 0) { |
| return; |
| } |
| if (ptr >= times.length) { |
| compact(); |
| return; |
| } |
| eventCounter = 0; |
| long time = System.currentTimeMillis(); |
| if (offset < 0) { |
| offset = time; |
| } |
| int value = (int) (time - offset); |
| times[ptr++] = value; |
| } |
| |
| private void compact() { |
| for (int i = 1; i < ptr / 2; ++i) { |
| times[i] = times[i * 2]; |
| } |
| resolution <<= 1; |
| ptr >>= 1; |
| } |
| |
| public int getResolution() { |
| return resolution; |
| } |
| |
| public int getCount() { |
| return ptr; |
| } |
| |
| public int[] getSamples() { |
| return times; |
| } |
| |
| public long getOffset() { |
| return offset; |
| } |
| } |