com.netflix.spectator.api.DefaultGauge Maven / Gradle / Ivy
/*
* Copyright 2014-2019 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.spectator.api;
import com.netflix.spectator.impl.AtomicDouble;
import java.util.Collections;
/** Counter implementation for the default registry. */
class DefaultGauge implements Gauge {
private final Clock clock;
private final Id id;
private final AtomicDouble value;
/** Create a new instance. */
DefaultGauge(Clock clock, Id id) {
this.clock = clock;
this.id = id;
this.value = new AtomicDouble(Double.NaN);
}
@Override public Id id() {
return id;
}
@Override public Iterable measure() {
final Measurement m = new Measurement(id, clock.wallTime(), value());
return Collections.singletonList(m);
}
@Override public boolean hasExpired() {
return false;
}
@Override public void set(double v) {
value.set(v);
}
@Override public double value() {
return value.get();
}
}