org.vishia.communication

Class SocketCommSimple

java.lang.Object

org.vishia.communication.SocketCommSimple

public class SocketCommSimple
extends java.lang.Object

This is a simple wrapper arround the basically network classes in java.net for simple UDP communication.
In opposite the InterProcessComm concept allows more flexibility to select the communication kind. This is only for socket and UDP.

Field Summary

Fields

Modifier and Type	Field and Description
(package private) java.net.SocketAddress	dstAddr
(package private) java.net.SocketAddress	ownAddr
(package private) java.net.DatagramSocket	so
static java.lang.String	version Version and history 2012-08 created

Constructor Summary

Constructors

Constructor and Description
SocketCommSimple()

Method Summary

Modifier and Type	Method and Description
(package private) java.net.InetAddress	buildInetAddr(int addr, int port) Builds the InetAddr.
void	close() Closes the socket.
void	open(int addr, int port) Opens a port for UDP communication.
int	rx(byte[] rxBuffer) Receive operation.
void	setDst(int addr, int port) Sets the destination for the next following telegrams for tx(byte[], int)
void	tx(byte[] data, int zdata) Transmit a data packet to the given setDst(int, int)
void	tx(java.lang.String msg) Transmit a String, but only as ASCII, one character is one byte.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

version

public static final java.lang.String version

Version and history

• 2012-08 created

See Also:

Constant Field Values

so

java.net.DatagramSocket so

ownAddr

java.net.SocketAddress ownAddr

dstAddr

java.net.SocketAddress dstAddr

Constructor Detail

SocketCommSimple

public SocketCommSimple()

Method Detail

buildInetAddr

java.net.InetAddress buildInetAddr(int addr,
                                   int port)

Builds the InetAddr.

Parameters:

addr - The IpV4 address High byte is left, for example 192.168.1.3 is 0xc0a80103

port - The port 16 bit valid

Returns:

proper InetAddress

open

public void open(int addr,
                 int port)

Opens a port for UDP communication. Sets the internal so variable.

Parameters:

addr - The IpV4 address High byte is left, for example 192.168.1.3 is 0xc0a80103

port - The port 16 bit valid On any error so remains null and an error message is outputted on System.err.

setDst

public void setDst(int addr,
                   int port)

Sets the destination for the next following telegrams for tx(byte[], int)

Parameters:

addr - The IpV4 address High byte is left, for example 192.168.1.3 is 0xc0a80103

port - The port 16 bit valid

close

public void close()

Closes the socket. A waiting receive action is aborted then.

tx

public void tx(byte[] data,
               int zdata)

Transmit a data packet to the given setDst(int, int)

Parameters:

data -

zdata - length of data to transmit. data must have at least this length.

Throws:

java.io.IOException

tx

public void tx(java.lang.String msg)

Transmit a String, but only as ASCII, one character is one byte.

Parameters:

msg -

rx

public int rx(byte[] rxBuffer)

Receive operation. The operation waits for a incomming telegram (block) but aborts on close.

Parameters:

rxBuffer -

Returns:

number of bytes or -1 on error. On any error a message is output on System.err.