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java.lang.Object org.acplt.oncrpc.OncRpcTcpSocketHelper
public class OncRpcTcpSocketHelper
Wraps JRE-specific networking code for TCP/IP-based client sockets. So much for compile once, make it unuseable everywhere. Why could our great Sun simply not get their socket class straight from the beginning? The BSD socket API has been around since long enough and that real network applications need to control certain aspects of the transport layer's behaviour was also well known at this time -- looks like the one exceptions was -- and still is -- Sun, and the second one is MS.
Sun always toutes Java as the perfect network "whatever" (replace with buzzword-of-the-day, like "programming language", "operating system",...) and especially their support for the Web. Sweet irony that it took them until JRE 1.3 to realize that half-closed connections are the way to do HTTP/1.0 non-persistent connections. And even more irony that they are now beginning to understand about polled network i/o.
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:
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):
In order to support connect() timeouts before JDK 1.4, there's
now a connect()
method available. It is more than just a
simple wrapper for pre JDK 1.4.
Nested Class Summary | |
---|---|
private class |
OncRpcTcpSocketHelper.Connectiator
The class Connectiator has a short and sometimes sad
life, as its only purpose is trying to connect to a TCP port at
another host machine. |
Field Summary | |
---|---|
private java.lang.reflect.Constructor |
ctor
Constructor Socket() without any parameters or null if not available
in the class library of a particular JRE. |
private java.lang.reflect.Method |
methodConnect
Method Socket.connect with timeout or null if not available
in the class library of a particular JRE. |
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.Socket |
socket
The socket for which we have to help out with some missing methods. |
Constructor Summary | |
---|---|
OncRpcTcpSocketHelper()
Creates a stream socket helper but does not associates it with a real stream socket object. |
|
OncRpcTcpSocketHelper(java.net.Socket socket)
Creates a stream socket helper and associates it with the given stream-based socket. |
Method Summary | |
---|---|
java.net.Socket |
connect(java.net.InetAddress address,
int port,
int timeout)
Connects to specified TCP port at given host address, but aborts after timeout milliseconds if the connection could not be established within this time frame. |
int |
getReceiveBufferSize()
Get size of receive buffer for this socket. |
int |
getSendBufferSize()
Get size of send buffer for this socket. |
protected void |
inspectSocketClassMethods()
Looks up methods of class Socket 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 |
---|
private java.net.Socket socket
private java.lang.reflect.Method methodSetSendBufferSize
null
if not available
in the class library of a particular JRE.
private java.lang.reflect.Method methodSetReceiveBufferSize
null
if not available
in the class library of a particular JRE.
private java.lang.reflect.Method methodGetSendBufferSize
null
if not available
in the class library of a particular JRE.
private java.lang.reflect.Method methodGetReceiveBufferSize
null
if not available
in the class library of a particular JRE.
private java.lang.reflect.Method methodConnect
null
if not available
in the class library of a particular JRE.
private java.lang.reflect.Constructor ctor
null
if not available
in the class library of a particular JRE.
Constructor Detail |
---|
public OncRpcTcpSocketHelper(java.net.Socket socket)
socket
- The socket associated with this helper.public OncRpcTcpSocketHelper()
connect(java.net.InetAddress, int, int)
lateron for a timeout-controlled connect.
Method Detail |
---|
public java.net.Socket connect(java.net.InetAddress address, int port, int timeout) throws java.io.IOException
On pre-JRE 1.4 systems, this method will create a new thread to handle connection establishment. This should be no problem, as in general you might not want to connect to many ONC/RPC servers at the same time; but surely someone will soon pop up with a perfect reason just to do so...
timeout
- Timeout in milliseconds for connection operation.
A negative timeout leaves the exact timeout up to the particular
JVM and java.net implementation.
java.io.IOException
- with the message "connect interrupted" in case the
timeout was reached before the connection could be established.public void setSendBufferSize(int size) throws java.net.SocketException
size
- The size to which to set the send buffer size. This value
must be greater than 0.
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.public int getSendBufferSize() throws java.net.SocketException
java.net.SocketException
- If the transport layer could not be queried
for the size of this socket's send buffer.public void setReceiveBufferSize(int size) throws java.net.SocketException
size
- The size to which to set the receive buffer size. This value
must be greater than 0.
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.public int getReceiveBufferSize() throws java.net.SocketException
java.net.SocketException
- If the transport layer could not be queried
for the size of this socket's receive buffer.protected void inspectSocketClassMethods()
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