com.hazelcast.monitor.impl.LocalPNCounterStatsImpl Maven / Gradle / Ivy

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Core Hazelcast Module
There is a newer version: 5.5.0
/*
 * Copyright (c) 2008-2020, 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.monitor.impl;

import com.hazelcast.internal.metrics.Probe;
import com.hazelcast.internal.json.JsonObject;
import com.hazelcast.monitor.LocalPNCounterStats;
import com.hazelcast.util.Clock;

import java.util.concurrent.atomic.AtomicLongFieldUpdater;

import static com.hazelcast.util.JsonUtil.getLong;
import static java.util.concurrent.atomic.AtomicLongFieldUpdater.newUpdater;

/**
 * Local PN counter statistics thread safe implementation
 */
public class LocalPNCounterStatsImpl implements LocalPNCounterStats {
    private static final AtomicLongFieldUpdater TOTAL_INCREMENT_OPERATION_COUNT =
            newUpdater(LocalPNCounterStatsImpl.class, "totalIncrementOperationCount");
    private static final AtomicLongFieldUpdater TOTAL_DECREMENT_OPERATION_COUNT =
            newUpdater(LocalPNCounterStatsImpl.class, "totalDecrementOperationCount");
    @Probe
    private long creationTime;
    @Probe
    private volatile long value;
    @Probe
    private volatile long totalIncrementOperationCount;
    @Probe
    private volatile long totalDecrementOperationCount;

    public LocalPNCounterStatsImpl() {
        creationTime = Clock.currentTimeMillis();
    }

    @Override
    public long getCreationTime() {
        return creationTime;
    }

    @Override
    public long getValue() {
        return value;
    }

    @Override
    public long getTotalIncrementOperationCount() {
        return totalIncrementOperationCount;
    }

    @Override
    public long getTotalDecrementOperationCount() {
        return totalDecrementOperationCount;
    }

    /**
     * Sets the current value for the PN counter.
     *
     * @param value the PN counter value
     */
    public void setValue(long value) {
        this.value = value;
    }

    /**
     * Increments the number of add (including increment) operations on this
     * PN counter.
     */
    public void incrementIncrementOperationCount() {
        TOTAL_INCREMENT_OPERATION_COUNT.incrementAndGet(this);
    }

    /**
     * Increments the number of subtract (including decrement) operations on
     * this PN counter.
     */
    public void incrementDecrementOperationCount() {
        TOTAL_DECREMENT_OPERATION_COUNT.incrementAndGet(this);
    }

    @Override
    public JsonObject toJson() {
        JsonObject root = new JsonObject();
        root.add("creationTime", creationTime);
        root.add("value", value);
        root.add("totalIncrementOperationCount", totalIncrementOperationCount);
        root.add("totalDecrementOperationCount", totalDecrementOperationCount);
        return root;
    }

    @Override
    public void fromJson(JsonObject json) {
        creationTime = getLong(json, "creationTime", -1L);
        value = getLong(json, "value", -1L);
        totalIncrementOperationCount = getLong(json, "totalIncrementOperationCount", -1L);
        totalDecrementOperationCount = getLong(json, "totalDecrementOperationCount", -1L);
    }

    @Override
    public String toString() {
        return "LocalPNCounterStatsImpl{"
                + "creationTime=" + creationTime
                + ", value=" + value
                + ", totalIncrementOperationCount=" + totalIncrementOperationCount
                + ", totalDecrementOperationCount=" + totalDecrementOperationCount
                + '}';
    }
}