com.netflix.servo.monitor.BasicCounter Maven / Gradle / Ivy
/*
* Copyright 2011-2018 Netflix, Inc.
*
* 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 com.netflix.servo.monitor;
import com.netflix.servo.SpectatorContext;
import com.netflix.servo.annotations.DataSourceType;
import com.netflix.servo.tag.TagList;
import java.util.concurrent.atomic.AtomicLong;
/**
* A simple counter implementation backed by an {@link java.util.concurrent.atomic.AtomicLong}.
* The value is the total count for the life of the counter. Observers are responsible
* for converting to a rate and handling overflows if they occur.
*/
public final class BasicCounter extends AbstractMonitor
implements Counter, SpectatorMonitor {
private final MonitorConfig baseConfig;
private final AtomicLong count = new AtomicLong();
private final SpectatorContext.LazyCounter spectatorCounter;
/**
* Creates a new instance of the counter.
*/
public BasicCounter(MonitorConfig config) {
super(config.withAdditionalTag(DataSourceType.COUNTER));
this.baseConfig = config;
spectatorCounter = SpectatorContext.counter(config);
}
/**
* {@inheritDoc}
*/
@Override
public void increment() {
spectatorCounter.increment();
count.incrementAndGet();
}
/**
* {@inheritDoc}
*/
@Override
public void increment(long amount) {
spectatorCounter.increment(amount);
count.getAndAdd(amount);
}
/**
* {@inheritDoc}
*/
@Override
public Number getValue(int pollerIdx) {
return count.get();
}
/**
* {@inheritDoc}
*/
@Override
public void initializeSpectator(TagList tags) {
spectatorCounter.setId(SpectatorContext.createId(baseConfig.withAdditionalTags(tags)));
}
/**
* {@inheritDoc}
*/
@Override
public boolean equals(Object obj) {
if (obj == null || !(obj instanceof BasicCounter)) {
return false;
}
BasicCounter m = (BasicCounter) obj;
return config.equals(m.getConfig()) && count.get() == m.count.get();
}
/**
* {@inheritDoc}
*/
@Override
public int hashCode() {
int result = config.hashCode();
long n = count.get();
result = 31 * result + (int) (n ^ (n >>> 32));
return result;
}
/**
* {@inheritDoc}
*/
@Override
public String toString() {
return "BasicCounter{config=" + config + ", count=" + count.get() + '}';
}
}