org.redisson.connection.balancer.LoadBalancerManagerImpl Maven / Gradle / Ivy

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Redis Java client with features of In-Memory Data Grid
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/**
 * Copyright 2014 Nikita Koksharov, Nickolay Borbit
 *
 * 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 org.redisson.connection.balancer;

import java.net.InetSocketAddress;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Collections;
import java.util.List;
import java.util.Map;

import org.redisson.MasterSlaveServersConfig;
import org.redisson.client.RedisConnection;
import org.redisson.client.RedisConnectionException;
import org.redisson.client.RedisPubSubConnection;
import org.redisson.connection.ClientConnectionsEntry;
import org.redisson.connection.ClientConnectionsEntry.FreezeReason;
import org.redisson.connection.ConnectionManager;
import org.redisson.connection.MasterSlaveEntry;
import org.redisson.connection.pool.PubSubConnectionPool;
import org.redisson.connection.pool.SlaveConnectionPool;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import io.netty.util.concurrent.Future;
import io.netty.util.concurrent.FutureListener;
import io.netty.util.internal.PlatformDependent;

public class LoadBalancerManagerImpl implements LoadBalancerManager {

    private final Logger log = LoggerFactory.getLogger(getClass());

    private final ConnectionManager connectionManager;
    private final Map addr2Entry = PlatformDependent.newConcurrentHashMap();
    private final PubSubConnectionPool pubSubEntries;
    private final SlaveConnectionPool entries;

    public LoadBalancerManagerImpl(MasterSlaveServersConfig config, ConnectionManager connectionManager, MasterSlaveEntry entry) {
        this.connectionManager = connectionManager;
        entries = new SlaveConnectionPool(config, connectionManager, entry);
        pubSubEntries = new PubSubConnectionPool(config, connectionManager, entry);
    }

    public Future add(final ClientConnectionsEntry entry) {
        Future f = entries.add(entry);
        f.addListener(new FutureListener() {
            @Override
            public void operationComplete(Future future) throws Exception {
                addr2Entry.put(entry.getClient().getAddr(), entry);
                pubSubEntries.add(entry);
            }
        });
        return f;
    }

    public int getAvailableClients() {
        int count = 0;
        for (ClientConnectionsEntry connectionEntry : addr2Entry.values()) {
            if (!connectionEntry.isFreezed()) {
                count++;
            }
        }
        return count;
    }

    public boolean unfreeze(String host, int port, FreezeReason freezeReason) {
        InetSocketAddress addr = new InetSocketAddress(host, port);
        ClientConnectionsEntry entry = addr2Entry.get(addr);
        if (entry == null) {
            throw new IllegalStateException("Can't find " + addr + " in slaves!");
        }

        synchronized (entry) {
            if (!entry.isFreezed()) {
                return false;
            }
            if ((freezeReason == FreezeReason.RECONNECT
                    && entry.getFreezeReason() == FreezeReason.RECONNECT)
                        || freezeReason != FreezeReason.RECONNECT) {
                entry.resetFailedAttempts();
                entry.setFreezed(false);
                entry.setFreezeReason(null);
                return true;
            }
        }
        return false;
    }

    public Collection freeze(String host, int port, FreezeReason freezeReason) {
        InetSocketAddress addr = new InetSocketAddress(host, port);
        ClientConnectionsEntry connectionEntry = addr2Entry.get(addr);
        if (connectionEntry == null) {
            return Collections.emptyList();
        }

        synchronized (connectionEntry) {
            log.debug("{} freezed", addr);
            connectionEntry.setFreezed(true);
            // only RECONNECT freeze reason could be replaced
            if (connectionEntry.getFreezeReason() == null
                    || connectionEntry.getFreezeReason() == FreezeReason.RECONNECT) {
                connectionEntry.setFreezeReason(freezeReason);
            }
        }

        // close all connections
        while (true) {
            RedisConnection connection = connectionEntry.pollConnection();
            if (connection == null) {
                break;
            }
            connection.closeAsync();
        }

        // close all pub/sub connections
        while (true) {
            RedisPubSubConnection connection = connectionEntry.pollSubscribeConnection();
            if (connection == null) {
                break;
            }
            connection.closeAsync();
        }

        synchronized (connectionEntry) {
            List list = new ArrayList(connectionEntry.getAllSubscribeConnections());
            connectionEntry.getAllSubscribeConnections().clear();
            return list;
        }
    }

    public Future nextPubSubConnection() {
        return pubSubEntries.get();
    }

    public Future getConnection(InetSocketAddress addr) {
        ClientConnectionsEntry entry = addr2Entry.get(addr);
        if (entry != null) {
            return entries.get(entry);
        }
        RedisConnectionException exception = new RedisConnectionException("Can't find entry for " + addr);
        return connectionManager.newFailedFuture(exception);
    }

    public Future nextConnection() {
        return entries.get();
    }

    public void returnPubSubConnection(RedisPubSubConnection connection) {
        ClientConnectionsEntry entry = addr2Entry.get(connection.getRedisClient().getAddr());
        pubSubEntries.returnConnection(entry, connection);
    }

    public void returnConnection(RedisConnection connection) {
        ClientConnectionsEntry entry = addr2Entry.get(connection.getRedisClient().getAddr());
        entries.returnConnection(entry, connection);
    }

    public void shutdown() {
        for (ClientConnectionsEntry entry : addr2Entry.values()) {
            entry.getClient().shutdown();
        }
    }

    public void shutdownAsync() {
        for (ClientConnectionsEntry entry : addr2Entry.values()) {
            connectionManager.shutdownAsync(entry.getClient());
        }
    }

}