| /* |
| * 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.solr.metrics; |
| |
| import java.util.Collections; |
| import java.util.Map; |
| import java.util.concurrent.ConcurrentHashMap; |
| import java.util.concurrent.atomic.AtomicInteger; |
| |
| import com.codahale.metrics.Metric; |
| |
| /** |
| * This class is used for keeping several partial named values and providing useful statistics over them. |
| */ |
| public class AggregateMetric implements Metric { |
| |
| /** |
| * Simple class to represent current value and how many times it was set. |
| */ |
| public static class Update { |
| public Object value; |
| public final AtomicInteger updateCount = new AtomicInteger(); |
| |
| public Update(Object value) { |
| update(value); |
| } |
| |
| public void update(Object value) { |
| this.value = value; |
| updateCount.incrementAndGet(); |
| } |
| |
| @Override |
| public String toString() { |
| return "Update{" + |
| "value=" + value + |
| ", updateCount=" + updateCount + |
| '}'; |
| } |
| } |
| |
| private final Map<String, Update> values = new ConcurrentHashMap<>(); |
| |
| public void set(String name, Object value) { |
| final Update existing = values.get(name); |
| if (existing == null) { |
| final Update created = new Update(value); |
| final Update raced = values.putIfAbsent(name, created); |
| if (raced != null) { |
| raced.update(value); |
| } |
| } else { |
| existing.update(value); |
| } |
| } |
| |
| public void clear(String name) { |
| values.remove(name); |
| } |
| |
| public void clear() { |
| values.clear(); |
| } |
| |
| public int size() { |
| return values.size(); |
| } |
| |
| public boolean isEmpty() { |
| return values.isEmpty(); |
| } |
| |
| public Map<String, Update> getValues() { |
| return Collections.unmodifiableMap(values); |
| } |
| |
| // --------- stats --------- |
| public double getMax() { |
| if (values.isEmpty()) { |
| return 0; |
| } |
| Double res = null; |
| for (Update u : values.values()) { |
| if (!(u.value instanceof Number)) { |
| continue; |
| } |
| Number n = (Number)u.value; |
| if (res == null) { |
| res = n.doubleValue(); |
| continue; |
| } |
| if (n.doubleValue() > res) { |
| res = n.doubleValue(); |
| } |
| } |
| if (res == null) { |
| return 0; |
| } |
| return res; |
| } |
| |
| public double getMin() { |
| if (values.isEmpty()) { |
| return 0; |
| } |
| Double res = null; |
| for (Update u : values.values()) { |
| if (!(u.value instanceof Number)) { |
| continue; |
| } |
| Number n = (Number)u.value; |
| if (res == null) { |
| res = n.doubleValue(); |
| continue; |
| } |
| if (n.doubleValue() < res) { |
| res = n.doubleValue(); |
| } |
| } |
| if (res == null) { |
| return 0; |
| } |
| return res; |
| } |
| |
| public double getMean() { |
| if (values.isEmpty()) { |
| return 0; |
| } |
| double total = 0; |
| for (Update u : values.values()) { |
| if (!(u.value instanceof Number)) { |
| continue; |
| } |
| Number n = (Number)u.value; |
| total += n.doubleValue(); |
| } |
| return total / values.size(); |
| } |
| |
| public double getStdDev() { |
| int size = values.size(); |
| if (size < 2) { |
| return 0; |
| } |
| final double mean = getMean(); |
| double sum = 0; |
| int count = 0; |
| for (Update u : values.values()) { |
| if (!(u.value instanceof Number)) { |
| continue; |
| } |
| count++; |
| Number n = (Number)u.value; |
| final double diff = n.doubleValue() - mean; |
| sum += diff * diff; |
| } |
| if (count < 2) { |
| return 0; |
| } |
| final double variance = sum / (count - 1); |
| return Math.sqrt(variance); |
| } |
| |
| public double getSum() { |
| if (values.isEmpty()) { |
| return 0; |
| } |
| double res = 0; |
| for (Update u : values.values()) { |
| if (!(u.value instanceof Number)) { |
| continue; |
| } |
| Number n = (Number)u.value; |
| res += n.doubleValue(); |
| } |
| return res; |
| } |
| |
| @Override |
| public String toString() { |
| return "AggregateMetric{" + |
| "size=" + size() + |
| ", max=" + getMax() + |
| ", min=" + getMin() + |
| ", mean=" + getMean() + |
| ", stddev=" + getStdDev() + |
| ", sum=" + getSum() + |
| ", values=" + values + |
| '}'; |
| } |
| } |