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JAVA NIO服务器:如何重置所有连接_Java_Sockets_Nio - Fatal编程技术网

JAVA NIO服务器:如何重置所有连接

JAVA NIO服务器:如何重置所有连接,java,sockets,nio,Java,Sockets,Nio,我必须在JBoss中构建一个JavaNIO服务器应用程序,以便从10-200个传感器盒中读取数据。他们打开一个流,一直向我发送数据。通信是双向的。现在,有时会发生这样的情况:这些盒子(或服务器)有一些内部错误。为了检测这类问题,观察者线程每5秒检查一次数据块是否在上次检查后进入。如果在此之前我的任何一个盒子都没有发送数据,那么就发生了不好的事情,我想重新启动整个套接字通信 现在,关于如何使用NIO建立套接字连接已经有了很好的文档记录,但是很难找到如何清理和重置它们的复杂示例。这就是我的问题:当我

我必须在JBoss中构建一个JavaNIO服务器应用程序,以便从10-200个传感器盒中读取数据。他们打开一个流,一直向我发送数据。通信是双向的。现在,有时会发生这样的情况:这些盒子(或服务器)有一些内部错误。为了检测这类问题,观察者线程每5秒检查一次数据块是否在上次检查后进入。如果在此之前我的任何一个盒子都没有发送数据,那么就发生了不好的事情,我想重新启动整个套接字通信

现在,关于如何使用NIO建立套接字连接已经有了很好的文档记录,但是很难找到如何清理和重置它们的复杂示例。这就是我的问题:当我的看门狗检测到在过去5秒内没有数据时,它会调用close()然后调用startEngine()。但在那之后,仍然没有数据到达。有些东西似乎被阻塞了,有些资源仍然相关或类似。如果我重新启动JBoss,数据就会再次到达。谁能给我一个提示吗

谢谢你抽出时间! 斯特凡

公共类TestServer
{
专用NIOServer;
private HashMap clientsList=new HashMap();
类NIOServer扩展线程
{
类消息缓冲区
{
int[]msgAsByte=新int[msgSize];
int pos=0;
int lastSign=0;
int字节读取=0;
}
private ByteBuffer readBuffer=ByteBuffer.allocate(256);
专用选择器;
私有布尔停止=false;
专用int[]端口;
私有int-msgSize=48;
私有HashMap缓冲区=新HashMap();
私人列表频道;
//将SocketChannel映射到ByteBuffer实例列表
私有映射pendingDataToWrite=newHashMap();
公共NIOServer(int[]端口){
这个端口=端口;
}
私有void stopAll()
{
停止=真;
尝试
{
中断();
加入服务器(3000);
} 
捕捉(中断异常e){
Thread.currentThread().interrupt();
}
闭合连接();
}
public void sendData(SocketChannel套接字,字节[]数据)
{ 
//并将要写入的数据排队
已同步(此.pendingDataToWrite){
列表队列=(列表)this.pendingDataToWrite.get(套接字);
if(队列==null){
queue=newarraylist();
this.pendingDataToWrite.put(套接字,队列);
}
add(ByteBuffer.wrap(数据));
}
SelectionKey=socket.keyFor(此.selector);
if(key!=null)
key.interesttops(选择key.OP_WRITE);
//最后,唤醒我们正在选择的线程,以便它可以进行所需的更改
这个.selector.wakeup();
}
公开募捐
{
尝试
{
停止=错误;
选择器=selector.open();
通道=新的ArrayList();
serversocketchannelserverchannel;
用于(int端口:端口)
{
尝试
{
serverchannel=ServerSocketChannel.open();
serverchannel.configureBlocking(false);
尝试
{
serverchannel.socket().setReuseAddress(true);
}
捕获(SocketException se)
{
//
}
serverchannel.socket().bind(新的InetSocketAddress(端口));
serverchannel.register(选择器、SelectionKey.OP_ACCEPT);
channels.add(serverchannel);
}
捕获(例外e)
{
//
}
}
当(!停止)
{
SelectionKey=null;
尝试
{
selector.select();
迭代器键迭代器=选择器。selectedKeys()
.iterator();
while(keysIterator.hasNext())
{
key=keysIterator.next();
if(key.isValid())
{
if(key.isAcceptable())
{
接受(钥匙);
} 
else if(key.isReadable())
{
读取数据(键);
} 
else if(key.isWritable())
{
写入数据(键);
}
}
其他的
{
SocketChannel sc=(SocketChannel)key.channel();
}
键位
public class TestServer 
{
  private NIOServer server;
  private HashMap<String, SocketChannel> clientsList = new HashMap<String, SocketChannel>();

  class NIOServer extends Thread 
  {
        class MessageBuffer
        {
              int [] msgAsByte = new int[msgSize];
              int pos = 0;
              int lastSign = 0;                                    
              int bytesRead = 0;
        }
        private ByteBuffer readBuffer = ByteBuffer.allocate(256);
        private Selector selector;
        private boolean stop = false;
        private int[] ports;
        private int msgSize = 48;
        private HashMap<String,MessageBuffer> buffer = new HashMap<String, MessageBuffer>();

        private List<ServerSocketChannel> channels;
        // Maps a SocketChannel to a list of ByteBuffer instances
        private Map<SocketChannel, List<ByteBuffer>> pendingDataToWrite = new HashMap<SocketChannel, List<ByteBuffer>>();

        public NIOServer(int[] ports) {
              this.ports = ports;
        }

        private void stopAll()
        {
              stop = true;

              try 
              {
                    server.interrupt();
                    server.join(3000);
              } 
              catch (InterruptedException e) {
                    Thread.currentThread().interrupt();
              }
              closeConnections();
        }

        public void sendData(SocketChannel socket, byte[] data) 
        { 
              // And queue the data we want written
              synchronized (this.pendingDataToWrite) {
                    List<ByteBuffer> queue = (List<ByteBuffer>) this.pendingDataToWrite.get(socket);
                    if (queue == null) {
                          queue = new ArrayList<ByteBuffer>();
                          this.pendingDataToWrite.put(socket, queue);
                    }
                    queue.add(ByteBuffer.wrap(data));
              }

              SelectionKey key = socket.keyFor(this.selector);
              if(key != null)
                    key.interestOps(SelectionKey.OP_WRITE);
              // Finally, wake up our selecting thread so it can make the required changes
              this.selector.wakeup();
        }

        public void run() 
        {
              try
              {
                    stop = false;
                    selector = Selector.open();
                    channels = new ArrayList<ServerSocketChannel>();
                    ServerSocketChannel serverchannel;
                    for (int port : ports) 
                    {
                          try
                          {
                                serverchannel = ServerSocketChannel.open();
                                serverchannel.configureBlocking(false);
                                try
                                {
                                      serverchannel.socket().setReuseAddress(true);
                                }
                                catch(SocketException se)
                                {
                                      //
                                }
                                serverchannel.socket().bind(new InetSocketAddress(port));
                                serverchannel.register(selector, SelectionKey.OP_ACCEPT);
                                channels.add(serverchannel);
                          }
                          catch(Exception e)
                          {
                                //
                          }
                    }
                    while (!stop) 
                    {

                          SelectionKey key = null;
                          try 
                          {
                                selector.select();
                                Iterator<SelectionKey> keysIterator = selector.selectedKeys()
                                            .iterator();
                                while (keysIterator.hasNext()) 
                                {
                                      key = keysIterator.next();

                                      if(key.isValid())
                                      {
                                            if (key.isAcceptable()) 
                                            {
                                                  accept(key);
                                            } 
                                            else if (key.isReadable()) 
                                            {
                                                  readData(key);
                                            } 
                                            else if (key.isWritable()) 
                                            {
                                                  writeData(key);
                                            }
                                      }
                                      else
                                      {
                                            SocketChannel sc = (SocketChannel) key.channel(); 
                                      }
                                      keysIterator.remove();
                                }
                          }
                          catch ( Exception e) 
                          {
                                if(e instanceof IOException || e instanceof ClosedSelectorException)
                                {
                                      try
                                      {
                                            ServerSocketChannel ssc = (ServerSocketChannel) key.channel();
                                            channels.remove(ssc);
                                            ssc.close();
                                            key.cancel();
                                      }
                                      catch(Exception ex)
                                      {
                                            //
                                      }

                                }
                                else
                                {
                                      //
                                }
                          }
                    } 
              }
              catch(Exception e1)
              {
                    //
              }

              closeConnections();

        }

        private void closeConnections()
        {
              //if thread is stopped, close all 
              try
              {
                    try 
                    {
                          if(this.selector == null || this.selector.keys() == null)
                          {
                                log.debug("No selectors or keys found to close");
                          }
                          else
                          {
                                Iterator<SelectionKey> keys = this.selector.keys().iterator();
                                while(keys.hasNext()) 
                                {
                                      SelectionKey key = keys.next();
                                      key.cancel();
                                }
                          }
                    }
                    catch(Exception ex) {
                          //
                    }
                    if(selector != null)
                          selector.close();
                    if(channels != null)
                    {
                          for(ServerSocketChannel channel:channels)
                          {
                                channel.socket().close();
                                channel.close();
                          }
                    }

                    if(clientsList != null)
                    {
                          Iterator<Map.Entry<String, SocketChannel>> hfm = clientsList.entrySet().iterator();
                          while(hfm.hasNext()) 
                          {
                                Map.Entry<String, SocketChannel> s = hfm.next();
                                s.getValue().close();
                          }
                    }
                    clientsList=null;

                    selector = null;
                    channels = null;
                    pendingDataToWrite = null;
              }
              catch(Exception e)
              {
                    //
              }

        }

        private void accept(SelectionKey key) throws IOException 
        {

              ServerSocketChannel ssc = (ServerSocketChannel) key.channel();
              SocketChannel sc = ssc.accept();
              sc.configureBlocking(false);
              sc.register(selector, SelectionKey.OP_READ);

              String ip = sc.socket().getRemoteSocketAddress().toString();
              if(!buffer.containsKey(ip))
                    buffer.put(ip, new MessageBuffer());
        }

        private void readData(SelectionKey key) throws Exception
        {

              SocketChannel sc = (SocketChannel) key.channel();      

              MessageBuffer buf = buffer.get(sc.socket().getRemoteSocketAddress().toString());
              try
              {
                    buf.bytesRead = sc.read(readBuffer); //read into buffer.
              }
              catch(Exception e2)
              {
                    sc.close();
                    buffer.remove(sc);
              }

              //close connection
              if (buf.bytesRead == -1)
              {
                    sc.close();
                    key.cancel();
                    return;
              }

              readBuffer.flip();      //make buffer ready for read

              while(readBuffer.hasRemaining())
              {
                    //Read the data and forward it to another Process...
              }

              readBuffer.compact(); //make buffer ready for writing

        }

        private void writeData(SelectionKey key) throws Exception
        {
              SocketChannel socketChannel = (SocketChannel) key.channel();
              synchronized (this.pendingDataToWrite) {
                    List queue = (List) this.pendingDataToWrite.get(socketChannel);

                    // Write until there's not more data ...
                    while (!queue.isEmpty()) {
                          ByteBuffer buf = (ByteBuffer) queue.get(0);
                          try
                          {
                                socketChannel.write(buf);
                          }
                          catch(Exception e)
                          {
                                //
                          }
                          finally
                          {
                                queue.remove(0);
                          }
                          if (buf.remaining() > 0) {
                                // ... or the socket's buffer fills up
                                break;
                          }
                    }

                    key.interestOps(SelectionKey.OP_READ);
              }
        }
  }



  public void close() {

        if (server != null && server.isAlive()) 
        {      
                    server.stopAll(); 
        }
        if(clientsList != null)
        {
              clientsList.clear();
        }
        server = null;

  }

  public void startEngine(int[] ports) {
        if (ports != null) {
              for (int port : ports)
                    log.info("Listening on port " + port);
              server= new NIOServer(ports);
              server.start();
        }
  }

}