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/**
 * Copyright 2017 VMware, 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 *

* https://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 io.micrometer.statsd; import io.micrometer.core.instrument.AbstractMeter; import io.micrometer.core.instrument.Gauge; import io.micrometer.core.instrument.util.MeterEquivalence; import io.micrometer.core.lang.Nullable; import org.reactivestreams.Subscriber; import java.lang.ref.WeakReference; import java.util.concurrent.atomic.AtomicReference; import java.util.function.ToDoubleFunction; public class StatsdGauge extends AbstractMeter implements Gauge, StatsdPollable { private final StatsdLineBuilder lineBuilder; private final Subscriber subscriber; private final WeakReference ref; private final ToDoubleFunction value; private final AtomicReference lastValue = new AtomicReference<>(Double.NaN); private final boolean alwaysPublish; private volatile boolean shutdown = false; StatsdGauge(Id id, StatsdLineBuilder lineBuilder, Subscriber subscriber, @Nullable T obj, ToDoubleFunction value, boolean alwaysPublish) { super(id); this.lineBuilder = lineBuilder; this.subscriber = subscriber; this.ref = new WeakReference<>(obj); this.value = value; this.alwaysPublish = alwaysPublish; } @Override public double value() { T obj = ref.get(); return obj != null ? value.applyAsDouble(ref.get()) : Double.NaN; } @Override public void poll() { double val = value(); if (!shutdown && Double.isFinite(val) && (alwaysPublish || lastValue.getAndSet(val) != val)) { subscriber.onNext(lineBuilder.gauge(val)); } } @SuppressWarnings("EqualsWhichDoesntCheckParameterClass") @Override public boolean equals(Object o) { return MeterEquivalence.equals(this, o); } @Override public int hashCode() { return MeterEquivalence.hashCode(this); } void shutdown() { this.shutdown = true; } }





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