org.apache.niolex.config.service.impl.ReplicaServiceImpl.java Source code

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Here is the source code for org.apache.niolex.config.service.impl.ReplicaServiceImpl.java

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/**
 * ReplicaServiceImpl.java
 *
 * Copyright 2012 Niolex, Inc.
 *
 * Niolex 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.niolex.config.service.impl;

import java.net.InetAddress;
import java.net.InetSocketAddress;
import java.util.HashMap;
import java.util.Map;
import java.util.Set;

import org.apache.niolex.commons.codec.StringUtil;
import org.apache.niolex.commons.net.NetUtil;
import org.apache.niolex.commons.test.MockUtil;
import org.apache.niolex.commons.util.DateTimeUtil;
import org.apache.niolex.config.core.CodeMap;
import org.apache.niolex.config.handler.GroupAddedHandler;
import org.apache.niolex.config.handler.GroupDiffHandler;
import org.apache.niolex.config.service.ReplicaService;
import org.apache.niolex.network.Config;
import org.apache.niolex.network.IPacketWriter;
import org.apache.niolex.network.PacketData;
import org.apache.niolex.network.client.PacketClient;
import org.apache.niolex.network.handler.DispatchPacketHandler;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

/**
 * @author <a href="mailto:xiejiyun@gmail.com">Xie, Jiyun</a>
 * @version 1.0.0
 * @since 2012-7-6
 */
@Service
public class ReplicaServiceImpl implements ReplicaService {
    private static final Logger LOG = LoggerFactory.getLogger(ReplicaServiceImpl.class);
    private static final String AUTH = "3836a809b1bd88a0f093916a4bc46a6b";
    private static final Set<InetAddress> IP_SET = NetUtil.getAllLocalAddresses();

    private final Map<String, PacketClient> otherServers = new HashMap<String, PacketClient>();

    @Autowired
    private GroupDiffHandler diffHandler;
    @Autowired
    private GroupAddedHandler addHandler;
    // The local Server listening port
    private int localPort;

    /**
     * Override super method
     * @see org.apache.niolex.config.service.ReplicaService#connectToOtherServers(java.net.InetSocketAddress[])
     */
    @Override
    public synchronized void connectToOtherServers(InetSocketAddress[] addresses) {
        for (InetSocketAddress addr : addresses) {
            if (!otherServers.containsKey(addr.toString())) {
                tryConnectToOtherServer(addr);
            }
        }
    }

    public void tryConnectToOtherServer(InetSocketAddress addr) {
        /**
         * First of all, let's remove localhost from the list.
         */
        if (IP_SET.contains(addr.getAddress()) && localPort == addr.getPort()) {
            return;
        }
        final PacketClient client = new PacketClient();
        otherServers.put(addr.toString(), client);
        LOG.info("Want to connect to {}.", addr);
        client.setConnectTimeout(60000);
        client.setServerAddress(addr);
        ReConnectHandler handler = new ReConnectHandler();
        handler.addHandler(CodeMap.GROUP_DIF, diffHandler);
        handler.addHandler(CodeMap.GROUP_ADD, addHandler);
        client.setPacketHandler(handler);

        // Do try connect in another thread.
        new Thread() {
            public void run() {
                initConnection(client);
            }
        }.start();
    }

    /**
     * Try to connect to the other server infinitely.
     * @param client
     */
    public void initConnection(PacketClient client) {
        long sleepTime = 0;
        while (true) {
            try {
                client.connect();
                break;
            } catch (Exception e) {
                LOG.info("Error occured when connect to address: {}, client will retry. {}",
                        client.getServerAddress(), e.toString());
                try {
                    if (sleepTime < DateTimeUtil.MINUTE * 10) {
                        sleepTime += 3000 + MockUtil.randInt(10000);
                    }
                    Thread.sleep(sleepTime);
                } catch (InterruptedException e1) {
                }
            }
        }
        connected(client);
    }

    /**
     * Connected to other server, so we init heart beat and init server subscribe.
     * @param client
     */
    public void connected(PacketClient client) {
        client.handleWrite(new PacketData(Config.CODE_REGR_HBEAT));
        client.handleWrite(new PacketData(CodeMap.SERVER_SUBS, AUTH));
    }

    class ReConnectHandler extends DispatchPacketHandler {
        private boolean reTry = true;

        /**
         * Add this to listen server subscribe result.
         */
        @Override
        public void handlePacket(PacketData sc, IPacketWriter wt) {
            if (sc.getCode() == CodeMap.RES_SERVER_SUBS) {
                String result = StringUtil.utf8ByteToStr(sc.getData());
                if (!result.equalsIgnoreCase("OK")) {
                    // Subscribe to server failed.
                    LOG.warn("Subscribe to server {} failed: {}.", wt.getRemoteName(), result);
                    reTry = false;
                    ((PacketClient) wt).stop();
                }
            } else {
                super.handlePacket(sc, wt);
            }
        }

        @Override
        public void handleClose(IPacketWriter wt) {
            if (reTry) {
                LOG.warn("Connection to {} lost, system will try to reconnect.", wt.getRemoteName());
                initConnection((PacketClient) wt);
            }
        }

    }

    public void setDiffHandler(GroupDiffHandler diffHandler) {
        this.diffHandler = diffHandler;
    }

    public void setAddHandler(GroupAddedHandler addHandler) {
        this.addHandler = addHandler;
    }

    public void setLocalPort(int localPort) {
        this.localPort = localPort;
    }

}