com.hazelcast.internal.metrics.impl.AbstractGauge Maven / Gradle / Ivy
/*
* Copyright (c) 2008-2018, Hazelcast, Inc. All Rights Reserved.
*
* 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.hazelcast.internal.metrics.impl;
import com.hazelcast.internal.metrics.Metric;
abstract class AbstractGauge implements Metric {
protected final MetricsRegistryImpl metricsRegistry;
protected final String name;
private volatile ProbeInstance probeInstance;
AbstractGauge(MetricsRegistryImpl metricsRegistry, String name) {
this.metricsRegistry = metricsRegistry;
this.name = name;
}
@Override
public String getName() {
return name;
}
void clearProbeInstance() {
probeInstance = null;
}
ProbeInstance getProbeInstance() {
ProbeInstance probeInstance = this.probeInstance;
if (probeInstance == null) {
probeInstance = metricsRegistry.getProbeInstance(name);
this.probeInstance = probeInstance;
}
return probeInstance;
}
}