Class OncRpcTcpSocketHelper
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):
- getTcpNoDelay() / setTcpNoDelay()
- getSoTimeout() / setSoTimeout()
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.
- Version:
- $Revision: 1.3 $ $Date: 2007/05/29 19:45:46 $ $State: Exp $ $Locker: $
- Author:
- Harald Albrecht
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Nested Class Summary
Nested ClassesModifier and TypeClassDescriptionprivate class
The classConnectiator
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
FieldsModifier and TypeFieldDescriptionprivate Constructor
Constructor Socket() without any parameters ornull
if not available in the class library of a particular JRE.private Method
Method Socket.connect with timeout ornull
if not available in the class library of a particular JRE.private Method
Method Socket.getReceiveBufferSize ornull
if not available in the class library of a particular JRE.private Method
Method Socket.getSendBufferSize ornull
if not available in the class library of a particular JRE.private Method
Method Socket.setReceiverBufferSize ornull
if not available in the class library of a particular JRE.private Method
Method Socket.setSendBufferSize ornull
if not available in the class library of a particular JRE.private Socket
The socket for which we have to help out with some missing methods. -
Constructor Summary
ConstructorsConstructorDescriptionCreates a stream socket helper but does not associates it with a real stream socket object.OncRpcTcpSocketHelper
(Socket socket) Creates a stream socket helper and associates it with the given stream-based socket. -
Method Summary
Modifier and TypeMethodDescriptionconnect
(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
Get size of receive buffer for this socket.int
Get size of send buffer for this socket.protected void
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.
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Field Details
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socket
The socket for which we have to help out with some missing methods. -
methodSetSendBufferSize
Method Socket.setSendBufferSize ornull
if not available in the class library of a particular JRE. -
methodSetReceiveBufferSize
Method Socket.setReceiverBufferSize ornull
if not available in the class library of a particular JRE. -
methodGetSendBufferSize
Method Socket.getSendBufferSize ornull
if not available in the class library of a particular JRE. -
methodGetReceiveBufferSize
Method Socket.getReceiveBufferSize ornull
if not available in the class library of a particular JRE. -
methodConnect
Method Socket.connect with timeout ornull
if not available in the class library of a particular JRE. -
ctor
Constructor Socket() without any parameters ornull
if not available in the class library of a particular JRE.
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Constructor Details
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OncRpcTcpSocketHelper
Creates a stream socket helper and associates it with the given stream-based socket.- Parameters:
socket
- The socket associated with this helper.
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OncRpcTcpSocketHelper
public OncRpcTcpSocketHelper()Creates a stream socket helper but does not associates it with a real stream socket object. You need to callconnect(java.net.InetAddress, int, int)
lateron for a timeout-controlled connect.
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Method Details
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connect
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.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...
- Parameters:
timeout
- Timeout in milliseconds for connection operation. A negative timeout leaves the exact timeout up to the particular JVM and java.net implementation.- Throws:
IOException
- with the message "connect interrupted" in case the timeout was reached before the connection could be established.
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setSendBufferSize
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:
SocketException
- if the socket's send buffer size could not be set, because the transport layer decided against accepting the new buffer size.IllegalArgumentException
- ifsize
is 0 or negative.
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getSendBufferSize
Get size of send buffer for this socket.- Returns:
- Size of send buffer.
- Throws:
SocketException
- If the transport layer could not be queried for the size of this socket's send buffer.
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setReceiveBufferSize
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:
SocketException
- if the socket's receive buffer size could not be set, because the transport layer decided against accepting the new buffer size.IllegalArgumentException
- ifsize
is 0 or negative.
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getReceiveBufferSize
Get size of receive buffer for this socket.- Returns:
- Size of receive buffer.
- Throws:
SocketException
- If the transport layer could not be queried for the size of this socket's receive buffer.
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inspectSocketClassMethods
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.
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