tigase源码分析2:ConnectionOpenThread 处理服务端socket的线程
原文链接：https://blog.csdn.net/u013934901/java/article/details/84693760
一、 ConnectionOpenThread 使用单例模式，他是负责建立服务端SOCKET和 接收连接客户端socket 线程。
在初始化ConnectionManager的时候ConnectionManager.connectThread 属性所引用的服务端SOCKET连接线程ConnectionOpenThread 就被初始化了
ConnectionManager：：
private static ConnectionOpenThread connectThread = ConnectionOpenThread.getInstance();
ConnectionOpenThread .getInstance()的实现
private Selector selector= null;
public static ConnectionOpenThread getInstance() {
if (acceptThread == null) {
acceptThread = new ConnectionOpenThread();
Thread thrd = new Thread(acceptThread);
thrd.setName("ConnectionOpenThread");
thrd.start(); //启动ConnectionOpenThread线程，则this.run（）方法将被被执行
if (log.isLoggable(Level.FINER)) {
log.finer("ConnectionOpenThread started.");
}
} // end of if (acceptThread == null)
return acceptThread;
}
private ConnectionOpenThread() {
.......
try {
selector = Selector.open();//得到一个选择器，可以去了解下nio api
} catch (Exception e) {
log.log(Level.SEVERE, "Server I/O error, can't continue my work.", e);
stopping = true;
} // end of try-catch
}
ConnectionOpenThread .run()的实现
在该方法中，selector管理的都是服务端SOCKET
public void run() {
while (!stopping) {
try {
selector.select();
//此方法为阻塞方法，当选择器管理channel（也就是向selector注册的channel） 中发生读、写或异常事件时，select（）将会被触发会往下执行
// Set<SelectionKey> selected_keys = selector.selectedKeys();
// for (SelectionKey sk : selected_keys) {
//返回已此通道已准备就绪的键集，已选择始终是键集的一个子集。
//begin iterator
for (Iterator i = selector.selectedKeys().iterator(); i.hasNext(); ) {
SelectionKey sk = (SelectionKey) i.next();
i.remove();
SocketChannel sc = null;
boolean throttled = false;
int port_no = 0;
if ((sk.readyOps() & SelectionKey.OP_ACCEPT) != 0) { //在此是否为被动SOCKET也就是服务端SOCKET，是则接受客户端socket
ServerSocketChannel nextReady = (ServerSocketChannel) sk.channel();
port_no = nextReady.socket().getLocalPort();
sc = nextReady.accept();//得到一个客户端SOCKET
...
} // end of if (sk.readyOps() & SelectionKey.OP_ACCEPT)
if ((sk.readyOps() & SelectionKey.OP_CONNECT) != 0) {
sk.cancel(); // 从Selector中删除指定的SelectionKey
//所以这个普通的conect socket只会处理一次侦听到的发生事件
sc = (SocketChannel) sk.channel();//得到connect SOCKET
} // end of if (sk.readyOps() & SelectionKey.OP_ACCEPT)
if (sc != null) { //设置接收到的SOCKET的一些信息
try {
sc.configureBlocking(false);//将客户端通道设置为非阻塞
sc.socket().setSoLinger(false, 0);
sc.socket().setReuseAddress(true);
//每个ServerSocketChannel在创建注册到selector 时就被绑定了一个ConnectionOpenListener对象， 用这个对象来处理该接受到的socket，该注册过程 在addAllWaiting()中进行
ConnectionOpenListener al = (ConnectionOpenListener) sk.attachment();
sc.socket().setTrafficClass(al.getTrafficClass());
sc.socket().setReceiveBufferSize(al.getReceiveBufferSize());
al.accept(sc);//此方法 为建立连接socket的进行后续处理的设定
} catch (java.net.SocketException e) {
ConnectionOpenListener al = (ConnectionOpenListener) sk.attachment();
al.accept(sc);
}
} else {
log.log(Level.INFO,
"Can not obtain socket channel from selection key, throttling activated = {0}, for port: {1}",
new Object[] { throttled, port_no });
} // end of if (sc != null) else
++accept_counter;
}
//end of iterator
addAllWaiting();//加载要注册到selector中的ServerSocketChannel或connect socket
} catch (IOException e) {
log.log(Level.SEVERE, "Server I/O error.", e);
// stopping = true;
} // end of catch
catch (Exception e) {
log.log(Level.SEVERE, "Other service exception.", e);
// stopping = true;
} // end of catch
}
}
在说解到addAllWaiting();加载要注册到selector中的ServerSocketChannel时，先看下源码：
在waiting队列中如果有等待处理的ConnectionOpenListener对象，则创建一个对应的ServerSocketChannel
private void addAllWaiting() throws IOException {
ConnectionOpenListener al = null;
while ((al = waiting.poll()) != null) {
try {
addPort(al);//绑定相关的端口进行监听
} catch (Exception e) {
log.log(Level.WARNING, "Error: creating connection for: " + al, e);
al.accept(null);
} // end of try-catch
} // end of for ()
}
private void addPort(ConnectionOpenListener al) throws IOException {
if ((al.getConnectionType() == ConnectionType.connect) && (al.getRemoteAddress() !=
null)) {
addISA(al.getRemoteAddress(), al);
} else if ((al.getIfcs() == null) || (al.getIfcs().length == 0) || al.getIfcs()[0]
.equals("ifc") || al.getIfcs()[0].equals("*")) {
addISA(new InetSocketAddress(al.getPort()), al);//绑定到InetSocketAddress进行监听服务
} else {
for (String ifc : al.getIfcs()) {
addISA(new InetSocketAddress(ifc, al.getPort()), al);
} // end of for ()
} // end of if (ip == null || ip.equals("")) else
}
//addISA(..)这才是真正创建ServerSocketChannel方法，绑定到服务器某一个端口上进行监听服务，
//开启了服务端socket
private void addISA(InetSocketAddress isa, ConnectionOpenListener al)throws IOException {
switch (al.getConnectionType()) {
case accept :
...
ServerSocketChannel ssc = ServerSocketChannel.open();
ssc.socket().setReceiveBufferSize(al.getReceiveBufferSize());
ssc.configureBlocking(false);//服务端socket也是非阻塞方法
ssc.socket().bind(isa, (int) (port_throttling)); //绑定到相关地址的某一个端口上
ssc.register(selector, SelectionKey.OP_ACCEPT, al);//注册服务端socket到selector中， 并且附带绑定一个ConnectionOpenListener对象，该对象为服务端socket接收到新来的socket 进行后续处理。所以selector能监听这些已注册socket的事件发生
break;
case connect :
...
//服务器socket之间要进行通讯，则先要连接
SocketChannel sc = SocketChannel.open();
sc.socket().setReceiveBufferSize(al.getReceiveBufferSize());
sc.socket().setTrafficClass(al.getTrafficClass());
sc.configureBlocking(false);
sc.connect(isa);
sc.register(selector, SelectionKey.OP_CONNECT, al);
//在此也注册到ConnectionOpenThread.selector中
break;
default :
..
break;
}
}
二、从以上addAllWaiting();分析中看到处理的都是waiting队列里的ConnectionOpenListener对象，那这个ConnectionOpenListener对象是什么时候就会被放到waiting队列的呢，这得从ConnectionManager.initializationCompleted()中说起，在启动章节中分析到MessageRouter.setProperties（map）负责加载了其它的组件最后对每一个组件都执行了初始化完成动作。从而ConnectionManager.initializationCompleted()将会被执行
MessageRouter：：
for (ServerComponent comp : components.values()) {
comp.initializationCompleted();
}
ConnectionManager.initializationCompleted()源码如下
public void initializationCompleted() {
if (isInitializationComplete()) {
// Do we really need to do this again?
return;
}
super.initializationCompleted();
initializationCompleted = true;
//加载组件中的服务配置
for (Map<String, Object> params : waitingTasks) {
//启动一个定时任务，设置准备加入ConnectionOpenThread.waiting的ConnectionListener对象
reconnectService(params, connectionDelay);
}
waitingTasks.clear();
if ( null != watchdog ){
watchdog.start();
}
}
2.1 也许看到上面的waitingTask你在想他是什么样的配置信息呢，其实他就是启动服务器监听端口的配置，系统 默认的有如下几种,bosh,c2s,s2s,ws2s组件的服务器配置，waitingTask装的是每一个组件的端口配置信息
c2s/connections/5222/type[S]=accept
c2s/connections/5222/socket[S]=plain
c2s/connections/5222/ifc[s]=*
c2s/connections/5222/remote-host[S]=localhost
c2s/connections/5222/connections/tls/required[B]=false
c2s/connections/5223/type[S]=accept
c2s/connections/5223/socket[S]=ssl
c2s/connections/5223/ifc[s]=*
c2s/connections/5223/remote-host[S]=localhost
c2s/connections/5223/connections/tls/required[B]=false
c2s/connections/ports[i]=5222, 5223
bosh/connections/5280/type[S]=accept
bosh/connections/5280/socket[S]=plain
bosh/connections/5280/ifc[s]=*
bosh/connections/5280/remote-host[S]=localhost
bosh/connections/5280/connections/tls/required[B]=false
bosh/connections/ports[i]=5280
s2s/connections/5269/type[S]=accept
s2s/connections/5269/socket[S]=plain
s2s/connections/5269/ifc[s]=*
s2s/connections/5269/remote-host[S]=localhost
s2s/connections/5269/connections/tls/required[B]=false
s2s/connections/ports[i]=5269
ws2s/connections/5290/type[S]=accept
ws2s/connections/5290/socket[S]=plain
ws2s/connections/5290/ifc[s]=*
ws2s/connections/5290/remote-host[S]=localhost
ws2s/connections/5290/connections/tls/required[B]=false
ws2s/connections/ports[i]=5290
2.1.1 ConnectionManager.setProperties(.)中对上面的配置信息作了解析，放到map里保存着
ConnectionManager.setProperties(Map<String, Object> props){
...
for (int i = 0; i < ports.length; i++) {
addWaitingTask(port_props);
}
}
//conn信息加入waitingTasks队列
protected void addWaitingTask(Map<String, Object> conn) {
if (initializationCompleted) {
reconnectService(conn, connectionDelay);
} else {
waitingTasks.add(conn);
}
}
2.2 然后回来ConnectionManager对象继续分析ConnectionOpenThread.waiting队列是怎么样增加了数据的。
ConnectionManager：：
//启动一个定时任务，设置准备加入ConnectionOpenThread.waiting的ConnectionListener对象
private void reconnectService(final Map<String, Object> port_props, long delay) {
...
addTimerTask(new tigase.util.TimerTask() {
@Override
public void run() {
startService(port_props);
}
}, delay);
}
//ConnectionOpenThread是单例模式，在此该对象只被初始化一次
private static ConnectionOpenThread connectThread = ConnectionOpenThread.getInstance();
private void startService(Map<String, Object> port_props) {
if (port_props == null) {
throw new NullPointerException("port_props cannot be null.");
}
//根据组件的配置信息生成一个相关的ConnectionListener对象
ConnectionListenerImpl cli = new ConnectionListenerImpl(port_props);
if (cli.getConnectionType() == ConnectionType.accept) {
pending_open.add(cli);
}
//将ConnectionListener对象加入ConnectionOpenThread.waiting队列中
connectThread.addConnectionOpenListener(cli);
}
最后在ConnectionOpenThread中可以看到ConnectionListener是怎么样加入waiting队列的了
ConnectionOpenThread：：
public void addConnectionOpenListener(ConnectionOpenListener al) {
waiting.offer(al);
selector.wakeup();
}
原文链接：https://blog.csdn.net/u013934901/java/article/details/84693760
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