Beispiel #1
0
 @Override
 public NextAction handleRead(FilterChainContext context) throws IOException {
   Object message = context.getMessage();
   Connection<?> connection = context.getConnection();
   Channel channel = GrizzlyChannel.getOrAddChannel(connection, url, handler);
   try {
     if (message instanceof Buffer) { // 收到新的数据包
       Buffer buffer = (Buffer) message; // 缓存
       int readable = buffer.capacity(); // 本次可读取新数据的大小
       if (readable == 0) {
         return context.getStopAction();
       }
       byte[] bytes; // byte[]缓存区,将Buffer转成byte[],再转成UnsafeByteArrayInputStream
       int offset; // 指向已用数据的偏移量,off之前的数据都是已用过的
       int limit; // 有效长度,limit之后的长度是空白或无效数据,off到limit之间的数据是准备使用的有效数据
       Object[] remainder = (Object[]) channel.getAttribute(BUFFER_KEY); // 上次序列化剩下的数据
       channel.removeAttribute(BUFFER_KEY);
       if (remainder == null) { // 如果没有,创建新的bytes缓存
         bytes = new byte[bufferSize];
         offset = 0;
         limit = 0;
       } else { // 如果有,使用剩下的bytes缓存
         bytes = (byte[]) remainder[0];
         offset = (Integer) remainder[1];
         limit = (Integer) remainder[2];
       }
       return receive(context, channel, buffer, readable, bytes, offset, limit);
     } else if (message instanceof Object[]) { // 同一Buffer多轮Filter,即:一个Buffer里有多个请求
       Object[] remainder = (Object[]) message;
       Buffer buffer = (Buffer) remainder[0];
       int readable = (Integer) remainder[1];
       byte[] bytes = (byte[]) remainder[2];
       int offset = (Integer) remainder[3];
       int limit = (Integer) remainder[4];
       return receive(context, channel, buffer, readable, bytes, offset, limit);
     } else { // 其它事件直接往下传
       return context.getInvokeAction();
     }
   } finally {
     GrizzlyChannel.removeChannelIfDisconnectd(connection);
   }
 }