org.apache.zookeeper.server.metric.SimpleCounterSet Maven / Gradle / Ivy
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* 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.zookeeper.server.metric;
import java.util.LinkedHashMap;
import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;
import org.apache.zookeeper.metrics.CounterSet;
/**
* Represent a set of counters identified by different keys.
* The counter is thread-safe
*/
public class SimpleCounterSet extends Metric implements CounterSet {
private final String name;
private final ConcurrentHashMap counters = new ConcurrentHashMap<>();
public SimpleCounterSet(final String name) {
this.name = name;
}
@Override
public void add(final String key, final long delta) {
final SimpleCounter counter = counters.computeIfAbsent(key, (k) -> new SimpleCounter(k + "_" + name));
counter.add(delta);
}
@Override
public void reset() {
counters.values().forEach(SimpleCounter::reset);
}
@Override
public Map values() {
final Map m = new LinkedHashMap<>();
counters.values().forEach(counter -> m.putAll(counter.values()));
return m;
}
}