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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.metrics;

import java.util.*;
import java.util.concurrent.atomic.AtomicInteger;

import com.codahale.metrics.Gauge;
import com.codahale.metrics.Histogram;
import com.codahale.metrics.Meter;
import com.codahale.metrics.Reservoir;
import org.apache.cassandra.transport.*;

import static org.apache.cassandra.metrics.CassandraMetricsRegistry.Metrics;

public final class ClientMetrics
{
    public static final ClientMetrics instance = new ClientMetrics();

    private static final MetricNameFactory factory = new DefaultNameFactory("Client");

    private volatile boolean initialized = false;
    private Collection servers = Collections.emptyList();

    private Meter authSuccess;
    private Meter authFailure;
    private AtomicInteger pausedConnections;
    
    @SuppressWarnings({ "unused", "FieldCanBeLocal" })
    private Gauge pausedConnectionsGauge;
    
    private Meter requestDiscarded;
    private Meter requestDispatched;

    private Meter protocolException;
    private Meter unknownException;

    private ClientMetrics()
    {
    }

    public void markAuthSuccess()
    {
        authSuccess.mark();
    }

    public void markAuthFailure()
    {
        authFailure.mark();
    }

    public void pauseConnection() { pausedConnections.incrementAndGet(); }
    public void unpauseConnection() { pausedConnections.decrementAndGet(); }

    public void markRequestDiscarded() { requestDiscarded.mark(); }
    public void markRequestDispatched() { requestDispatched.mark(); }

    public List allConnectedClients()
    {
        List clients = new ArrayList<>();

        for (Server server : servers)
            clients.addAll(server.getConnectedClients());

        return clients;
    }

    public void markProtocolException()
    {
        protocolException.mark();
    }

    public void markUnknownException()
    {
        unknownException.mark();
    }

    public synchronized void init(Collection servers)
    {
        if (initialized)
            return;

        this.servers = servers;

        // deprecated the lower-cased initial letter metric names in 4.0
        registerGauge("ConnectedNativeClients", "connectedNativeClients", this::countConnectedClients);
        registerGauge("ConnectedNativeClientsByUser", "connectedNativeClientsByUser", this::countConnectedClientsByUser);
        registerGauge("Connections", "connections", this::connectedClients);
        registerGauge("ClientsByProtocolVersion", "clientsByProtocolVersion", this::recentClientStats);
        registerGauge("RequestsSize", ClientResourceLimits::getCurrentGlobalUsage);

        Reservoir ipUsageReservoir = ClientResourceLimits.ipUsageReservoir();
        Metrics.register(factory.createMetricName("RequestsSizeByIpDistribution"),
                         new Histogram(ipUsageReservoir)
        {
             public long getCount()
             {
                 return ipUsageReservoir.size();
             }
        });

        authSuccess = registerMeter("AuthSuccess");
        authFailure = registerMeter("AuthFailure");

        pausedConnections = new AtomicInteger();
        pausedConnectionsGauge = registerGauge("PausedConnections", pausedConnections::get);
        requestDiscarded = registerMeter("RequestDiscarded");
        requestDispatched = registerMeter("RequestDispatched");

        protocolException = registerMeter("ProtocolException");
        unknownException = registerMeter("UnknownException");

        initialized = true;
    }

    private int countConnectedClients()
    {
        int count = 0;

        for (Server server : servers)
            count += server.countConnectedClients();

        return count;
    }

    private Map countConnectedClientsByUser()
    {
        Map counts = new HashMap<>();

        for (Server server : servers)
        {
            server.countConnectedClientsByUser()
                  .forEach((username, count) -> counts.put(username, counts.getOrDefault(username, 0) + count));
        }

        return counts;
    }

    private List> connectedClients()
    {
        List> clients = new ArrayList<>();

        for (Server server : servers)
            for (ConnectedClient client : server.getConnectedClients())
                clients.add(client.asMap());

        return clients;
    }

    private List> recentClientStats()
    {
        List> stats = new ArrayList<>();

        for (Server server : servers)
            for (ClientStat stat : server.recentClientStats())
                stats.add(new HashMap<>(stat.asMap())); // asMap returns guava, so need to convert to java for jmx

        stats.sort(Comparator.comparing(map -> map.get(ClientStat.PROTOCOL_VERSION)));

        return stats;
    }

    private  Gauge registerGauge(String name, Gauge gauge)
    {
        return Metrics.register(factory.createMetricName(name), gauge);
    }
    
    private void registerGauge(String name, String deprecated, Gauge gauge)
    {
        Gauge registeredGauge = registerGauge(name, gauge);
        Metrics.registerMBean(registeredGauge, factory.createMetricName(deprecated).getMBeanName());
    }

    private Meter registerMeter(String name)
    {
        return Metrics.meter(factory.createMetricName(name));
    }
}