Java tutorial
/** * 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 com.tongbanjie.tarzan.server.client; import com.tongbanjie.tarzan.rpc.util.RpcHelper; import io.netty.channel.Channel; import org.apache.commons.collections4.MapUtils; import org.slf4j.Logger; import org.slf4j.LoggerFactory; import org.springframework.stereotype.Component; import java.util.*; import java.util.Map.Entry; import java.util.concurrent.TimeUnit; import java.util.concurrent.locks.Lock; import java.util.concurrent.locks.ReentrantLock; /** * ?<p> * ?? * * @author zixiao * @date 16/10/15 */ @Component public class ClientManager { private static final Logger LOGGER = LoggerFactory.getLogger(ClientManager.class); private static final long LOCK_TIMEOUT_MILLIS = 3000; private static final long CHANNEL_EXPIRED_TIMEOUT = 1000 * 120; private final Lock groupChannelLock = new ReentrantLock(); private final HashMap<String /* group name */, HashMap<Channel, ClientChannelInfo>> groupChannelTable = new HashMap<String, HashMap<Channel, ClientChannelInfo>>(); private final Random random = new Random(); public ClientManager() { } public HashMap<String, HashMap<Channel, ClientChannelInfo>> getGroupChannelTable() { HashMap<String, HashMap<Channel, ClientChannelInfo>> newGroupChannelTable = new HashMap<String, HashMap<Channel, ClientChannelInfo>>(); try { if (this.groupChannelLock.tryLock(LOCK_TIMEOUT_MILLIS, TimeUnit.MILLISECONDS)) { try { newGroupChannelTable.putAll(groupChannelTable); } finally { groupChannelLock.unlock(); } } } catch (InterruptedException e) { Thread.currentThread().interrupt(); LOGGER.error("", e); } return newGroupChannelTable; } public void scanNotActiveChannel() { try { if (this.groupChannelLock.tryLock(LOCK_TIMEOUT_MILLIS, TimeUnit.MILLISECONDS)) { try { for (final Entry<String, HashMap<Channel, ClientChannelInfo>> entry : this.groupChannelTable .entrySet()) { final String group = entry.getKey(); final HashMap<Channel, ClientChannelInfo> chlMap = entry.getValue(); Iterator<Entry<Channel, ClientChannelInfo>> it = chlMap.entrySet().iterator(); while (it.hasNext()) { Entry<Channel, ClientChannelInfo> item = it.next(); final ClientChannelInfo info = item.getValue(); long diff = System.currentTimeMillis() - info.getLastUpdateTimestamp(); if (diff > CHANNEL_EXPIRED_TIMEOUT) { it.remove(); LOGGER.warn( "SCAN: remove expired channel[{}] from ClientManager groupChannelTable, client group name: {}", RpcHelper.parseChannelRemoteAddr(info.getChannel()), group); RpcHelper.closeChannel(info.getChannel()); } } } } finally { this.groupChannelLock.unlock(); } } else { LOGGER.warn("ClientManager scanNotActiveChannel lock timeout"); } } catch (InterruptedException e) { Thread.currentThread().interrupt(); LOGGER.error("", e); } } public void doChannelCloseEvent(final String remoteAddr, final Channel channel) { if (channel != null) { try { if (this.groupChannelLock.tryLock(LOCK_TIMEOUT_MILLIS, TimeUnit.MILLISECONDS)) { try { for (final Entry<String, HashMap<Channel, ClientChannelInfo>> entry : this.groupChannelTable .entrySet()) { final String group = entry.getKey(); final HashMap<Channel, ClientChannelInfo> clientChannelInfoTable = entry.getValue(); final ClientChannelInfo clientChannelInfo = clientChannelInfoTable.remove(channel); if (clientChannelInfo != null) { LOGGER.info( "NETTY EVENT: remove channel[{}][{}] from ClientManager groupChannelTable, client group: {}", clientChannelInfo.toString(), remoteAddr, group); } } } finally { this.groupChannelLock.unlock(); } } else { LOGGER.warn("ClientManager doChannelCloseEvent lock timeout"); } } catch (InterruptedException e) { Thread.currentThread().interrupt(); LOGGER.error("", e); } } } public void register(final String group, final ClientChannelInfo clientChannelInfo) { try { ClientChannelInfo clientChannelInfoFound = null; if (this.groupChannelLock.tryLock(LOCK_TIMEOUT_MILLIS, TimeUnit.MILLISECONDS)) { try { HashMap<Channel, ClientChannelInfo> channelTable = this.groupChannelTable.get(group); if (null == channelTable) { channelTable = new HashMap<Channel, ClientChannelInfo>(); this.groupChannelTable.put(group, channelTable); } clientChannelInfoFound = channelTable.get(clientChannelInfo.getChannel()); if (null == clientChannelInfoFound) { channelTable.put(clientChannelInfo.getChannel(), clientChannelInfo); LOGGER.info("New client connected, group: {} channel: {}", group, clientChannelInfo.toString()); } } finally { this.groupChannelLock.unlock(); } if (clientChannelInfoFound != null) { LOGGER.debug("Get heartbeat from client, group: {} channel: {}", group, clientChannelInfoFound); clientChannelInfoFound.setLastUpdateTimestamp(System.currentTimeMillis()); } } else { LOGGER.warn("ClientManager register lock timeout"); } } catch (InterruptedException e) { Thread.currentThread().interrupt(); LOGGER.error("", e); } } public void unregister(final String group, final ClientChannelInfo clientChannelInfo) { try { if (this.groupChannelLock.tryLock(LOCK_TIMEOUT_MILLIS, TimeUnit.MILLISECONDS)) { try { HashMap<Channel, ClientChannelInfo> channelTable = this.groupChannelTable.get(group); if (null != channelTable && !channelTable.isEmpty()) { ClientChannelInfo old = channelTable.remove(clientChannelInfo.getChannel()); if (old != null) { LOGGER.info("unregister a client[{}] from groupChannelTable {}", group, clientChannelInfo.toString()); } if (channelTable.isEmpty()) { this.groupChannelTable.remove(group); LOGGER.info("unregister a client group[{}] from groupChannelTable", group); } } } finally { this.groupChannelLock.unlock(); } } else { LOGGER.warn("ClientManager unregister client lock timeout"); } } catch (InterruptedException e) { Thread.currentThread().interrupt(); LOGGER.error("", e); } } public ClientChannelInfo pickClientRandomly(String group) { Map<Channel, ClientChannelInfo> map = this.groupChannelTable.get(group); if (MapUtils.isEmpty(map)) { return null; } List<ClientChannelInfo> clientChannelInfoList = new ArrayList<ClientChannelInfo>(map.values()); int size = clientChannelInfoList.size(); return clientChannelInfoList.get(random.nextInt(size)); } }