private void recv(SocketChannel sc, ClientInfo ci) throws IOException {
ci.channel.read(ci.inBuf);
ByteBuffer tmpBuf = ci.inBuf.duplicate();
tmpBuf.flip();
int bytesProcessed = 0;
boolean doneLoop = false;
while (!doneLoop) {
byte b;
try {
b = tmpBuf.get();
} catch (BufferUnderflowException bue) {
// Processed all data in buffer
ci.inBuf.clear();
doneLoop = true;
break;
}
switch (b) {
case TypeServerConstants.WELCOME:
bytesProcessed++;
break;
case TypeServerConstants.GET_STRING_REQUEST:
bytesProcessed++;
if (ci.outputPending) {
// Client is backed up. We can't append to
// the byte buffer because it's in the wrong
// state. We could allocate another buffer
// here and change our send method to know
// about multiple buffers, but we'll just
// assume that the client is dead
break;
}
ci.outBuf.put(TypeServerConstants.GET_STRING_RESPONSE);
ByteBuffer strBuf = encoder.encode(testString);
ci.outBuf.putShort((short) strBuf.remaining());
ci.outBuf.put(strBuf);
ci.outBuf.flip();
send(sc, ci);
break;
case TypeServerConstants.GET_STRING_RESPONSE:
int startPos = tmpBuf.position();
try {
int nBytes = tmpBuf.getInt();
byte[] buf = new byte[nBytes];
tmpBuf.get(buf);
bytesProcessed += buf.length + 5;
String s = new String(buf);
// Send the string to the GUI
break;
} catch (BufferUnderflowException bue) {
// Processed all available data
ci.inBuf.position(ci.inBuf.position() + bytesProcessed);
doneLoop = true;
}
break;
}
}
}
public static void main(String args[]) throws Exception {
final int ENOUGH_SIZE = 1024;
final int SMALL_SIZE = 4;
boolean isBlocked = true;
int size = ENOUGH_SIZE;
if (args.length > 0) {
int opt = Integer.parseInt(args[0]);
switch (opt) {
case 1:
isBlocked = true;
size = ENOUGH_SIZE;
break;
case 2:
isBlocked = true;
size = SMALL_SIZE;
break;
case 3:
isBlocked = false;
size = ENOUGH_SIZE;
break;
case 4:
isBlocked = false;
size = SMALL_SIZE;
break;
}
}
DatagramChannel channel = DatagramChannel.open();
channel.configureBlocking(isBlocked);
ByteBuffer buffer = ByteBuffer.allocate(size);
DatagramSocket socket = channel.socket();
SocketAddress localAddr = new InetSocketAddress(8000);
socket.bind(localAddr);
while (true) {
System.out.println("开始接收数据报");
SocketAddress remoteAddr = channel.receive(buffer);
if (remoteAddr == null) {
System.out.println("没有接收到数据报");
} else {
buffer.flip();
System.out.println("接收到的数据报的大小为" + buffer.remaining());
}
Thread.sleep(500);
}
}
private synchronized DBMessage go(DBMessage msg, ByteDecoder decoder) throws IOException {
if (_sock == null) _open();
{
ByteBuffer out = msg.prepare();
while (out.remaining() > 0) _sock.write(out);
}
if (_pool != null) _pool._everWorked = true;
if (decoder == null) return null;
ByteBuffer response = decoder._buf;
if (response.position() != 0) throw new IllegalArgumentException();
int read = 0;
while (read < DBMessage.HEADER_LENGTH) read += _read(response);
int len = response.getInt(0);
if (len <= DBMessage.HEADER_LENGTH)
throw new IllegalArgumentException("db sent invalid length: " + len);
if (len > response.capacity())
throw new IllegalArgumentException(
"db message size is too big (" + len + ") " + "max is (" + response.capacity() + ")");
response.limit(len);
while (read < len) read += _read(response);
if (read != len) throw new RuntimeException("something is wrong");
response.flip();
return new DBMessage(response);
}
private int _read(ByteBuffer buf) throws IOException {
int x = _in.read(buf.array(), buf.position(), buf.remaining());
if (x < 0) throw new IOException("connection to server closed unexpectedly");
buf.position(buf.position() + x);
return x;
}
private void readMessage(SelectionKey sk, SocketChannel readChannel, TcpAddress incomingAddress)
throws IOException {
// note that socket has been used
SocketEntry entry = (SocketEntry) sockets.get(incomingAddress);
if (entry != null) {
entry.used();
ByteBuffer readBuffer = entry.getReadBuffer();
if (readBuffer != null) {
readChannel.read(readBuffer);
if (readBuffer.hasRemaining()) {
readChannel.register(selector, SelectionKey.OP_READ, entry);
} else {
dispatchMessage(incomingAddress, readBuffer, readBuffer.capacity());
}
return;
}
}
ByteBuffer byteBuffer = ByteBuffer.wrap(buf);
byteBuffer.limit(messageLengthDecoder.getMinHeaderLength());
long bytesRead = readChannel.read(byteBuffer);
if (logger.isDebugEnabled()) {
logger.debug("Reading header " + bytesRead + " bytes from " + incomingAddress);
}
MessageLength messageLength = new MessageLength(0, Integer.MIN_VALUE);
if (bytesRead == messageLengthDecoder.getMinHeaderLength()) {
messageLength = messageLengthDecoder.getMessageLength(ByteBuffer.wrap(buf));
if (logger.isDebugEnabled()) {
logger.debug("Message length is " + messageLength);
}
if ((messageLength.getMessageLength() > getMaxInboundMessageSize())
|| (messageLength.getMessageLength() <= 0)) {
logger.error(
"Received message length "
+ messageLength
+ " is greater than inboundBufferSize "
+ getMaxInboundMessageSize());
synchronized (entry) {
entry.getSocket().close();
logger.info("Socket to " + entry.getPeerAddress() + " closed due to an error");
}
} else {
byteBuffer.limit(messageLength.getMessageLength());
bytesRead += readChannel.read(byteBuffer);
if (bytesRead == messageLength.getMessageLength()) {
dispatchMessage(incomingAddress, byteBuffer, bytesRead);
} else {
byte[] message = new byte[byteBuffer.limit()];
byteBuffer.flip();
byteBuffer.get(message, 0, byteBuffer.limit() - byteBuffer.remaining());
entry.setReadBuffer(ByteBuffer.wrap(message));
}
readChannel.register(selector, SelectionKey.OP_READ, entry);
}
} else if (bytesRead < 0) {
logger.debug("Socket closed remotely");
sk.cancel();
readChannel.close();
TransportStateEvent e =
new TransportStateEvent(
DefaultTcpTransportMapping.this,
incomingAddress,
TransportStateEvent.STATE_DISCONNECTED_REMOTELY,
null);
fireConnectionStateChanged(e);
}
}
