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Application monitoring instrumentation facade

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/**
 * Copyright 2017 Pivotal Software, 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 io.micrometer.statsd;

import io.micrometer.core.instrument.AbstractDistributionSummary;
import io.micrometer.core.instrument.Clock;
import io.micrometer.core.instrument.Meter;
import io.micrometer.core.instrument.distribution.DistributionStatisticConfig;
import io.micrometer.core.instrument.util.MeterEquivalence;
import io.micrometer.core.instrument.util.TimeDecayingMax;
import io.micrometer.core.lang.Nullable;
import org.reactivestreams.Subscriber;

import java.util.concurrent.atomic.DoubleAdder;
import java.util.concurrent.atomic.LongAdder;

public class StatsdDistributionSummary extends AbstractDistributionSummary {
    private final LongAdder count = new LongAdder();
    private final DoubleAdder amount = new DoubleAdder();
    private final TimeDecayingMax max;

    private final StatsdLineBuilder lineBuilder;
    private final Subscriber publisher;

    StatsdDistributionSummary(Meter.Id id, StatsdLineBuilder lineBuilder, Subscriber publisher, Clock clock,
                              DistributionStatisticConfig distributionStatisticConfig, double scale) {
        super(id, clock, distributionStatisticConfig, scale);
        this.max = new TimeDecayingMax(clock, distributionStatisticConfig);
        this.lineBuilder = lineBuilder;
        this.publisher = publisher;
    }

    @Override
    protected void recordNonNegative(double amount) {
        if (amount >= 0) {
            count.increment();
            this.amount.add(amount);
            max.record(amount);
            publisher.onNext(lineBuilder.histogram(amount));
        }
    }

    @Override
    public long count() {
        return count.longValue();
    }

    @Override
    public double totalAmount() {
        return amount.doubleValue();
    }

    /**
     * The StatsD agent will likely compute max with a different window, so the value may not match what you see here.
     * This value is not exported to the agent, and is only for diagnostic use.
     */
    @Override
    public double max() {
        return max.poll();
    }

    @SuppressWarnings("EqualsWhichDoesntCheckParameterClass")
    @Override
    public boolean equals(@Nullable Object o) {
        return MeterEquivalence.equals(this, o);
    }

    @Override
    public int hashCode() {
        return MeterEquivalence.hashCode(this);
    }
}