org.acplt.oncrpc
Class OncRpcUdpSocketHelper

java.lang.Object
  org.acplt.oncrpc.OncRpcUdpSocketHelper

public class OncRpcUdpSocketHelper
extends java.lang.Object

Wraps JRE-specific networking code for UDP/IP-based client sockets. So much for compile once, make it unuseable everywhere.

The following JRE-dependent methods are wrapped and will just do nothing or return fake information on old JRE plattforms. The number after each method wrapper indicates the first JRE version supporting a particular feature:

setSendBufferSize() -- 1.2

setReceiveBufferSize() -- 1.2

The following methods have been around since JDK 1.1, so we do not need to wrap them as we will never support JDK 1.0 -- let it rest in piece(s):

• getTcpNoDelay() / setTcpNoDelay()
• getSoTimeout() / setSoTimeout()

Field Summary

private java.lang.reflect.Method	methodGetReceiveBufferSize Method Socket.getReceiveBufferSize or null if not available in the class library of a particular JRE.
private java.lang.reflect.Method	methodGetSendBufferSize Method Socket.getSendBufferSize or null if not available in the class library of a particular JRE.
private java.lang.reflect.Method	methodSetReceiveBufferSize Method Socket.setReceiverBufferSize or null if not available in the class library of a particular JRE.
private java.lang.reflect.Method	methodSetSendBufferSize Method Socket.setSendBufferSize or null if not available in the class library of a particular JRE.
private java.net.DatagramSocket	socket The datagram socket for which we have to help out with some missing methods.

Constructor Summary

OncRpcUdpSocketHelper(java.net.DatagramSocket socket)
Creates a datagram socket and binds it to an arbitrary available port on the local host machine.

Method Summary

int	getReceiveBufferSize() Get size of receive buffer for this socket.
int	getSendBufferSize() Get size of send buffer for this socket.
protected void	queryMethods() Looks up methods of class DatagramSocket whether they are supported by the class libraries of the JRE we are currently executing on.
void	setReceiveBufferSize(int size) Sets the socket's receive buffer size as a hint to the underlying transport layer to use appropriately sized I/O buffers.
void	setSendBufferSize(int size) Sets the socket's send buffer size as a hint to the underlying transport layer to use appropriately sized I/O buffers.

Methods inherited from class java.lang.Object

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

Field Detail

socket

private java.net.DatagramSocket socket

The datagram socket for which we have to help out with some missing methods.

methodSetSendBufferSize

private java.lang.reflect.Method methodSetSendBufferSize

Method Socket.setSendBufferSize or null if not available in the class library of a particular JRE.

methodSetReceiveBufferSize

private java.lang.reflect.Method methodSetReceiveBufferSize

Method Socket.setReceiverBufferSize or null if not available in the class library of a particular JRE.

methodGetSendBufferSize

private java.lang.reflect.Method methodGetSendBufferSize

Method Socket.getSendBufferSize or null if not available in the class library of a particular JRE.

methodGetReceiveBufferSize

private java.lang.reflect.Method methodGetReceiveBufferSize

Method Socket.getReceiveBufferSize or null if not available in the class library of a particular JRE.

Constructor Detail

OncRpcUdpSocketHelper

public OncRpcUdpSocketHelper(java.net.DatagramSocket socket)

Creates a datagram socket and binds it to an arbitrary available port on the local host machine.

Method Detail

setSendBufferSize

public void setSendBufferSize(int size)
                       throws java.net.SocketException

Sets the socket's send buffer size as a hint to the underlying transport layer to use appropriately sized I/O buffers. If the class libraries of the underlying JRE do not support setting the send buffer size, this is silently ignored.

Parameters:

size - The size to which to set the send buffer size. This value must be greater than 0.

Throws:

java.net.SocketException - if the socket's send buffer size could not be set, because the transport layer decided against accepting the new buffer size.

java.lang.IllegalArgumentException - if size is 0 or negative.

getSendBufferSize

public int getSendBufferSize()
                      throws java.net.SocketException

Get size of send buffer for this socket.

Returns:

Size of send buffer.

Throws:

java.net.SocketException - If the transport layer could not be queried for the size of this socket's send buffer.

setReceiveBufferSize

public void setReceiveBufferSize(int size)
                          throws java.net.SocketException

Sets the socket's receive buffer size as a hint to the underlying transport layer to use appropriately sized I/O buffers. If the class libraries of the underlying JRE do not support setting the receive buffer size, this is silently ignored.

Parameters:

size - The size to which to set the receive buffer size. This value must be greater than 0.

Throws:

java.net.SocketException - if the socket's receive buffer size could not be set, because the transport layer decided against accepting the new buffer size.

java.lang.IllegalArgumentException - if size is 0 or negative.

getReceiveBufferSize

public int getReceiveBufferSize()
                         throws java.net.SocketException

Get size of receive buffer for this socket.

Returns:

Size of receive buffer.

Throws:

java.net.SocketException - If the transport layer could not be queried for the size of this socket's receive buffer.

queryMethods

protected void queryMethods()

Looks up methods of class DatagramSocket whether they are supported by the class libraries of the JRE we are currently executing on.