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The Apache Cassandra Project develops a highly scalable second-generation distributed database, bringing together Dynamo's fully distributed design and Bigtable's ColumnFamily-based data model.

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/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you 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 org.apache.cassandra.net;

import java.util.concurrent.atomic.AtomicLongFieldUpdater;

/**
 * Aggregates counters for (from, connection type) for the duration of host uptime.
 *
 * If contention/false sharing ever become a problem, consider introducing padding.
 */
class InboundCounters
{
    private volatile long errorCount;
    private volatile long errorBytes;

    private static final AtomicLongFieldUpdater errorCountUpdater =
        AtomicLongFieldUpdater.newUpdater(InboundCounters.class, "errorCount");
    private static final AtomicLongFieldUpdater errorBytesUpdater =
        AtomicLongFieldUpdater.newUpdater(InboundCounters.class, "errorBytes");

    void addError(int bytes)
    {
        errorCountUpdater.incrementAndGet(this);
        errorBytesUpdater.addAndGet(this, bytes);
    }

    long errorCount()
    {
        return errorCount;
    }

    long errorBytes()
    {
        return errorBytes;
    }

    private volatile long expiredCount;
    private volatile long expiredBytes;

    private static final AtomicLongFieldUpdater expiredCountUpdater =
        AtomicLongFieldUpdater.newUpdater(InboundCounters.class, "expiredCount");
    private static final AtomicLongFieldUpdater expiredBytesUpdater =
        AtomicLongFieldUpdater.newUpdater(InboundCounters.class, "expiredBytes");

    void addExpired(int bytes)
    {
        expiredCountUpdater.incrementAndGet(this);
        expiredBytesUpdater.addAndGet(this, bytes);
    }

    long expiredCount()
    {
        return expiredCount;
    }

    long expiredBytes()
    {
        return expiredBytes;
    }

    private volatile long processedCount;
    private volatile long processedBytes;

    private static final AtomicLongFieldUpdater processedCountUpdater =
        AtomicLongFieldUpdater.newUpdater(InboundCounters.class, "processedCount");
    private static final AtomicLongFieldUpdater processedBytesUpdater =
        AtomicLongFieldUpdater.newUpdater(InboundCounters.class, "processedBytes");

    void addProcessed(int bytes)
    {
        processedCountUpdater.incrementAndGet(this);
        processedBytesUpdater.addAndGet(this, bytes);
    }

    long processedCount()
    {
        return processedCount;
    }

    long processedBytes()
    {
        return processedBytes;
    }

    private volatile long scheduledCount;
    private volatile long scheduledBytes;

    private static final AtomicLongFieldUpdater scheduledCountUpdater =
        AtomicLongFieldUpdater.newUpdater(InboundCounters.class, "scheduledCount");
    private static final AtomicLongFieldUpdater scheduledBytesUpdater =
        AtomicLongFieldUpdater.newUpdater(InboundCounters.class, "scheduledBytes");

    void addPending(int bytes)
    {
        scheduledCountUpdater.incrementAndGet(this);
        scheduledBytesUpdater.addAndGet(this, bytes);
    }

    void removePending(int bytes)
    {
        scheduledCountUpdater.decrementAndGet(this);
        scheduledBytesUpdater.addAndGet(this, -bytes);
    }

    long scheduledCount()
    {
        return scheduledCount;
    }

    long scheduledBytes()
    {
        return scheduledBytes;
    }
}