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/*
* Copyright (c) 1996-2001
* Logica Mobile Networks Limited
* All rights reserved.
*
* This software is distributed under Logica Open Source License Version 1.0
* ("Licence Agreement"). You shall use it and distribute only in accordance
* with the terms of the License Agreement.
*
*/
package org.smpp;
import org.smpp.util.*;
import java.net.ServerSocket;
import java.net.Socket;
import java.net.SocketException;
import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.EOFException;
import java.io.IOException;
import java.io.InterruptedIOException;
import javax.net.ServerSocketFactory;
import javax.net.SocketFactory;
/**
* Implementation of TCP/IP type of communication.
* Covers both client (peer-to-peer) connection and server (new connections
* from clients accepting and creating) type of connections.
*
* @author Logica Mobile Networks SMPP Open Source Team
* @version $Id: TCPIPConnection.java 80 2009-10-28 02:13:18Z sverkera $
* @see Connection
* @see java.net.Socket
* @see java.net.ServerSocket
* @see java.io.BufferedInputStream
* @see java.io.BufferedOutputStream
*/
public class TCPIPConnection extends Connection {
/**
* The port number on the remote host to which the socket
* is connected or port number where receiverSocket
* is acception connections.
*/
private int port = 0;
/**
* The TCP/IP (client) socket.
*
* @see java.net.Socket
*/
private Socket socket = null;
/**
* An input stream for reading bytes from the socket.
*
* @see java.io.BufferedInputStream
*/
private BufferedInputStream inputStream = null;
/**
* An output stream for writting bytes to the socket.
*
* @see java.io.BufferedOutputStream
*/
private BufferedOutputStream outputStream = null;
/**
* Indication if the socket is opened.
*/
private boolean opened = false;
/**
* The server socket used for accepting connection on port.
*
* @see #port
* @see java.net.ServerSocket
*/
private ServerSocket receiverSocket = null;
/**
* Indicates if the connection represents client or server socket.
*/
private byte connType = CONN_NONE;
/**
* Indicates that the connection type hasn't been set yet.
*/
private static final byte CONN_NONE = 0;
/**
* Indicates that the connection is client type connection.
* @see #socket
*/
private static final byte CONN_CLIENT = 1;
/**
* Indicates that the connection is server type connection.
* @see #receiverSocket
*/
private static final byte CONN_SERVER = 2;
/**
* Default size for socket io streams buffers.
* @see #initialiseIOStreams(Socket)
*/
private static final int DFLT_IO_BUF_SIZE = 2 * 1024;
/**
* Default size for the receiving buffer.
*/
private static final int DFLT_RECEIVE_BUFFER_SIZE = 4 * 1024;
/**
* The default maximum of bytes received in one call to
* the receive function.
* @see #maxReceiveSize
* @see #receive()
*/
private static final int DFLT_MAX_RECEIVE_SIZE = 128 * 1024;
/**
* The size for IO stream's buffers. Used by the instances of
* BufferedInputStream which are used as sreams for accessing
* the socket.
* @see #setIOBufferSize(int)
*/
private int ioBufferSize = DFLT_IO_BUF_SIZE;
/**
* The receiver buffer size. Can be changed by call to the function
* setReceiveBufferSize. This is the maximum count of bytes
* which can be read from the socket in one call to the socket's
* input stream's read.
* @see #setReceiveBufferSize(int)
* @see #receive()
*/
private int receiveBufferSize;
/**
* The buffer for storing of received data in the receive
* function.
* @see #setReceiveBufferSize(int)
* @see #receive()
*/
private byte[] receiveBuffer;
/**
* Max count of bytes which can be returned from one call
* to the receive function. If the returned data seems
* to be incomplete, you might want to call the receive again.
* @see #setMaxReceiveSize(int)
* @see #receive()
*/
private int maxReceiveSize = DFLT_MAX_RECEIVE_SIZE;
/**
* Instanciate a SocketFactory which will be used to create sockets later.
* Subclasses can override this field with e.g. a SSLSocketFactory
*/
protected SocketFactory socketFactory = SocketFactory.getDefault();
/**
* Instanciate a ServerSocketFactory which will be used to create server sockets later.
* Subclasses can override this field with e.g. a SSLServerSocketFactory
*/
protected ServerSocketFactory serverSocketFactory = ServerSocketFactory.getDefault();
/**
* Initialises the connection with port only, which means that
* the connection will serve as connection receiving server.
* The accepting of the connection must be invoked explicitly by
* calling of accept method.
*
* @param port the port number to listen on
*/
public TCPIPConnection(int port) {
if ((port >= Data.MIN_VALUE_PORT) && (port <= Data.MAX_VALUE_PORT)) {
this.port = port;
} else {
debug.write("Invalid port.");
}
connType = CONN_SERVER;
}
/**
* Initialises the connection for client communication.
*
* @param address the address of the remote end
* of the socket
* @param port the port number on the remote host
*/
public TCPIPConnection(String address, int port) {
if (address.length() >= Data.MIN_LENGTH_ADDRESS) {
this.address = address;
} else {
debug.write("Invalid address.");
}
if ((port >= Data.MIN_VALUE_PORT) && (port <= Data.MAX_VALUE_PORT)) {
this.port = port;
} else {
debug.write("Invalid port.");
}
connType = CONN_CLIENT;
setReceiveBufferSize(DFLT_RECEIVE_BUFFER_SIZE);
}
/**
* Initialises the connection with existing socket.
* It's intended for use with one server connection which generates
* new sockets and creates connections with the sockets.
*
* @param socket the socket to use for communication
* @see #accept()
*/
public TCPIPConnection(Socket socket) throws IOException {
connType = CONN_CLIENT;
this.socket = socket;
address = socket.getInetAddress().getHostAddress();
port = socket.getPort();
initialiseIOStreams(socket);
opened = true;
setReceiveBufferSize(DFLT_RECEIVE_BUFFER_SIZE);
}
/**
* Opens the connection by creating new Socket (for client
* type connection) or by creating ServerSocket (for
* server type connection). If the connection is already opened,
* the method is not doing anything.
*
* @see #connType
* @see java.net.ServerSocket
* @see java.net.Socket
*/
public void open() throws IOException {
debug.enter(DCOM, this, "open");
IOException exception = null;
if (!opened) {
if (connType == CONN_CLIENT) {
try {
socket = socketFactory.createSocket(address, port);
initialiseIOStreams(socket);
opened = true;
debug.write(DCOM, "opened client tcp/ip connection to " + address + " on port " + port);
} catch (IOException e) {
debug.write("IOException opening TCPIPConnection " + e);
event.write(e, "IOException opening TCPIPConnection");
exception = e;
}
} else if (connType == CONN_SERVER) {
try {
receiverSocket = serverSocketFactory.createServerSocket(port);
opened = true;
debug.write(DCOM, "listening tcp/ip on port " + port);
} catch (IOException e) {
debug.write("IOException creating listener socket " + e);
exception = e;
}
} else {
debug.write("Unknown connection type = " + connType);
}
} else {
debug.write("attempted to open already opened connection ");
}
debug.exit(DCOM, this);
if (exception != null) {
throw exception;
}
}
/**
* Closes the client or server connection.
*
* @see #connType
* @see #open()
*/
public void close() throws IOException {
debug.enter(DCOM, this, "close");
IOException exception = null;
if (connType == CONN_CLIENT) {
try {
if(inputStream != null)
inputStream.close();
if(outputStream != null)
outputStream.close();
if(socket != null)
socket.close();
inputStream = null;
outputStream = null;
socket = null;
opened = false;
debug.write(DCOM, "closed client tcp/ip connection to " + address + " on port " + port);
} catch (IOException e) {
debug.write("IOException closing socket " + e);
event.write(e, "IOException closing socket");
exception = e;
}
} else if (connType == CONN_SERVER) {
try {
if(receiverSocket != null)
receiverSocket.close();
receiverSocket = null;
opened = false;
debug.write(DCOM, "stopped listening tcp/ip on port " + port);
} catch (IOException e) {
debug.write("IOException closing listener socket " + e);
event.write(e, "IOException closing listener socket");
exception = e;
}
} else {
debug.write("Unknown connection type = " + connType);
}
debug.exit(DCOM, this);
if (exception != null) {
throw exception;
}
}
/**
* Sends data over the connection. Must be client type connection.
* The timeout for sending is set by setCommsTimeout.
*
* @see java.net.Socket
*/
public void send(ByteBuffer data) throws IOException {
debug.enter(DCOM, this, "send");
IOException exception = null;
if (outputStream == null) {
debug.exit(DCOM, this);
throw new IOException("Not connected");
}
if (connType == CONN_CLIENT) {
try {
socket.setSoTimeout((int) getCommsTimeout());
try {
outputStream.write(data.getBuffer(), 0, data.length());
debug.write(DCOM, "sent " + data.length() + " bytes to " + address + " on port " + port);
} catch (IOException e) {
debug.write("IOException sending data " + e);
exception = e;
}
outputStream.flush();
} catch (IOException e) {
debug.write("IOException flushing data " + e);
if (exception == null) {
exception = e;
}
}
} else if (connType == CONN_SERVER) {
debug.write("Attempt to send data over server type connection.");
} else {
debug.write("Unknown connection type = " + connType);
}
debug.exit(DCOM, this);
if (exception != null) {
throw exception;
}
}
/**
* Reads data from the connection. Must be client type connection.
* The timeout for receiving is set by setReceiveTimeout.
* The timeout for single attempt to read something from socket is
* set by setCommsTimeout.
*
* @see #setReceiveBufferSize(int)
* @see #setMaxReceiveSize(int)
* @see Connection#getCommsTimeout()
* @see java.net.Socket
*/
public ByteBuffer receive() throws IOException {
debug.enter(DCOMD, this, "receive");
IOException exception = null;
ByteBuffer data = null;
if (connType == CONN_CLIENT) {
data = new ByteBuffer();
long endTime = Data.getCurrentTime() + getReceiveTimeout();
//int bytesAvailable = 0;
int bytesToRead = 0;
int bytesRead = 0;
int totalBytesRead = 0;
try {
socket.setSoTimeout((int) getCommsTimeout());
bytesToRead = receiveBufferSize;
debug.write(DCOMD, "going to read from socket");
debug.write(
DCOMD,
"comms timeout="
+ getCommsTimeout()
+ " receive timeout="
+ getReceiveTimeout()
+ " receive buffer size="
+ receiveBufferSize);
do {
bytesRead = 0;
try {
bytesRead = inputStream.read(receiveBuffer, 0, bytesToRead);
} catch (InterruptedIOException e) {
// comms read timeout expired, no problem
debug.write(DCOMD, "timeout reading from socket");
}
if (bytesRead > 0) {
debug.write(DCOMD, "read " + bytesRead + " bytes from socket");
data.appendBytes(receiveBuffer, bytesRead);
totalBytesRead += bytesRead;
}
if (bytesRead == -1) {
debug.write(DCOMD, "reached end of stream");
close();
throw new EOFException("Reached end of stream");
}
bytesToRead = inputStream.available();
if (bytesToRead > 0) {
debug.write(DCOMD, "more data (" + bytesToRead + " bytes) remains in the socket");
} else {
debug.write(DCOMD, "no more data remains in the socket");
}
if (bytesToRead > receiveBufferSize) {
bytesToRead = receiveBufferSize;
}
if (totalBytesRead + bytesToRead > maxReceiveSize) {
// would be more than allowed
bytesToRead = maxReceiveSize - totalBytesRead;
}
} while (
((bytesToRead != 0) && (Data.getCurrentTime() <= endTime)) && (totalBytesRead < maxReceiveSize));
debug.write(DCOM, "totally read " + data.length() + " bytes from socket");
} catch (IOException e) {
debug.write("IOException: " + e.getMessage());
event.write(e, "IOException receive via TCPIPConnection");
exception = e;
close();
}
} else if (connType == CONN_SERVER) {
debug.write("Attempt to receive data from server type connection.");
} else {
debug.write("Unknown connection type = " + connType);
}
debug.exit(DCOMD, this);
if (exception != null) {
throw exception;
}
return data;
}
/**
* Accepts new connection on server type connection, i.e. on ServerSocket.
* If new socket is returned from ServerSocket.accept(), creates new
* instance of TCPIPConnection with the new socket and returns it,
* otherwise returns null. The timeout for new connection accept is
* set by setReceiveTimeout, i.e. waits for new connection
* for this time and then, if none is requested, returns with null.
*
* @see #TCPIPConnection(Socket)
* @see java.net.ServerSocket#accept()
* @see java.net.ServerSocket#setSoTimeout(int)
*/
public Connection accept() throws IOException {
debug.enter(DCOMD, this, "receive");
IOException exception = null;
Connection newConn = null;
if (connType == CONN_SERVER) {
try {
receiverSocket.setSoTimeout((int) getReceiveTimeout());
} catch (SocketException e) {
// don't care, we're just setting the timeout
}
Socket acceptedSocket = null;
try {
acceptedSocket = receiverSocket.accept();
} catch (IOException e) {
debug.write(DCOMD, "Exception accepting socket (timeout?)" + e);
}
if (acceptedSocket != null) {
try {
newConn = new TCPIPConnection(acceptedSocket);
} catch (IOException e) {
debug.write("IOException creating new client connection " + e);
event.write(e, "IOException creating new client connection");
exception = e;
}
}
} else if (connType == CONN_CLIENT) {
debug.write("Attempt to receive data from client type connection.");
} else {
debug.write("Unknown connection type = " + connType);
}
debug.exit(DCOMD, this);
if (exception != null) {
throw exception;
}
return newConn;
}
/**
* Initialises input and output streams to the streams from socket
* for client type connection.
* Streams are used for sending and receiving data from the socket.
*
* @see #inputStream
* @see #outputStream
* @see java.net.Socket#getInputStream()
* @see java.net.Socket#getOutputStream()
*/
private void initialiseIOStreams(Socket socket) throws IOException {
if (connType == CONN_CLIENT) {
inputStream = new BufferedInputStream(socket.getInputStream(), ioBufferSize);
outputStream = new BufferedOutputStream(socket.getOutputStream(), ioBufferSize);
} else if (connType == CONN_SERVER) {
debug.write("Attempt to initialise i/o streams for server type connection.");
} else {
debug.write("Unknown connection type = " + connType);
}
}
/**
* Sets the size for the io buffers of streams for accessing the socket.
* The size can only be changed before actual opening of the connection.
* @see #initialiseIOStreams(Socket)
*/
public void setIOBufferSize(int ioBufferSize) {
if (!opened) {
this.ioBufferSize = ioBufferSize;
}
}
/**
* Sets the size of the receiving buffer, which is used for reading from
* the socket. A buffer of this size is allocated for the reading.
* @see #receive()
*/
public void setReceiveBufferSize(int receiveBufferSize) {
this.receiveBufferSize = receiveBufferSize;
receiveBuffer = new byte[receiveBufferSize];
}
/**
* Sets the maximum size of the data which can be read in one call to
* the receive function. After reading of this amount
* of bytes the receive returns the data read even if there are more data
* in the socket.
* @see #receive()
*/
public void setMaxReceiveSize(int maxReceiveSize) {
this.maxReceiveSize = maxReceiveSize;
}
/**
* @see org.smpp.Connection#isOpened()
*/
public boolean isOpened() {
return opened;
}
}
/*
* $Log: not supported by cvs2svn $
* Revision 1.2 2003/12/16 14:47:20 sverkera
* Added a close when reaching end-of-stream
*
* Revision 1.1 2003/07/23 00:28:39 sverkera
* Imported
*
*
* Old changelog:
* 26-09-01 [email protected] debug code categorized to groups
* 27-09-01 [email protected] receive() rewritten not to consume cpu time while
* waiting for data on socket
* 27-09-01 [email protected] added customizable limit on maximum received bytes
* in one call to receive()
* 27-09-01 [email protected] added prealocated buffer for socket reads
* with customizable size
* 28-09-01 [email protected] the io streams buffer size is customizable now
* 01-10-01 [email protected] traces added
*/
