/* * Copyright 2012-2015 org.opencloudb. * * 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 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.opencloudb.statistic; import java.util.LinkedList; import java.util.List; import org.opencloudb.util.TimeUtil; /** * 记录最近3个时段的平均响应时间,默认1,10,30分钟。 * * @author mycat */ public class HeartbeatRecorder { private static final int MAX_RECORD_SIZE = 256; private static final long AVG1_TIME = 60 * 1000L; private static final long AVG2_TIME = 10 * 60 * 1000L; private static final long AVG3_TIME = 30 * 60 * 1000L; private long avg1; private long avg2; private long avg3; private final List<Record> records; public HeartbeatRecorder() { this.records = new LinkedList<Record>(); } public String get() { return new StringBuilder().append(avg1).append(',').append(avg2).append(',').append(avg3).toString(); } public void set(long value) { if (value < 0) { return; } long time = TimeUtil.currentTimeMillis(); remove(time); int size = records.size(); if (size == 0) { records.add(new Record(value, time)); avg1 = avg2 = avg3 = value; return; } if (size >= MAX_RECORD_SIZE) { records.remove(0); } records.add(new Record(value, time)); calculate(time); } /** * 删除超过统计时间段的数据 */ private void remove(long time) { final List<Record> records = this.records; while (records.size() > 0) { Record record = records.get(0); if (time >= record.time + AVG3_TIME) { records.remove(0); } else { break; } } } /** * 计算记录的统计数据 */ private void calculate(long time) { long v1 = 0L, v2 = 0L, v3 = 0L; int c1 = 0, c2 = 0, c3 = 0; for (Record record : records) { long t = time - record.time; if (t <= AVG1_TIME) { v1 += record.value; ++c1; } if (t <= AVG2_TIME) { v2 += record.value; ++c2; } if (t <= AVG3_TIME) { v3 += record.value; ++c3; } } avg1 = (v1 / c1); avg2 = (v2 / c2); avg3 = (v3 / c3); } /** * @author mycat */ private static class Record { private long value; private long time; Record(long value, long time) { this.value = value; this.time = time; } } }