net.jini.jeri.connection

Interface Connection

public interface Connection

Represents an established client-side connection. For example, a TCP-based Connection implementation typically contains a Socket.

Connection is implemented by connection-based Endpoint implementations that use ConnectionManager for managing connections. A Connection is created by the implementation for newly-established connections and is obtained by a ConnectionManager from its ConnectionEndpoint's connect methods.

Since:

2.0

Author:

Sun Microsystems, Inc.

Method Summary

Modifier and Type	Method and Description
void	close() Closes this connection.
SocketChannel	getChannel() Returns a socket channel that performs I/O on this connection, or null if no socket channel is available.
InputStream	getInputStream() Returns an input stream that reads data from this connection.
OutputStream	getOutputStream() Returns an output stream that writes data to this connection.
InvocationConstraints	getUnfulfilledConstraints(OutboundRequestHandle handle) Implements OutboundRequest.getUnfulfilledConstraints for a request with the specified handle.
void	populateContext(OutboundRequestHandle handle, Collection context) Populates the supplied collection with context information representing a request with the specified handle.
IOException	readResponseData(OutboundRequestHandle handle, InputStream stream) Reads from the specified stream any per-response data required by this connection for a request with the specified handle.
void	writeRequestData(OutboundRequestHandle handle, OutputStream stream) Writes to the specified stream any per-request data required by this connection for a request with the specified handle.

Method Detail

getInputStream

InputStream getInputStream()
                    throws IOException

Returns an input stream that reads data from this connection.

Returns:

an input stream that reads data from this connection

Throws:

IOException - if an I/O exception occurs

getOutputStream

OutputStream getOutputStream()
                      throws IOException

Returns an output stream that writes data to this connection.

Returns:

an output stream that writes data to this connection

Throws:

IOException - if an I/O exception occurs

getChannel

SocketChannel getChannel()

Returns a socket channel that performs I/O on this connection, or null if no socket channel is available. If a non-null socket channel is returned, it is connected.

Returns:

a socket channel that performs I/O on this connection, or null

populateContext

void populateContext(OutboundRequestHandle handle,
                     Collection context)

Populates the supplied collection with context information representing a request with the specified handle. This method is used to implement OutboundRequest.populateContext for such requests; the context may also be populated by the connection manager.

Parameters:

handle - the handle for the request

context - the context collection to populate

Throws:

IllegalArgumentException - if the specified handle was not created for use with a connection endpoint equivalent to the one used to create this connection

NullPointerException - if handle or context is null

UnsupportedOperationException - if context is unmodifiable

getUnfulfilledConstraints

InvocationConstraints getUnfulfilledConstraints(OutboundRequestHandle handle)

Implements OutboundRequest.getUnfulfilledConstraints for a request with the specified handle.

Parameters:

handle - the handle for the request

Returns:

the constraints for the request that must be partially or fully implemented by higher layers

Throws:

IllegalArgumentException - if the specified handle was not created for use with a connection endpoint equivalent to the one used to create this connection

NullPointerException - if handle is null

writeRequestData

void writeRequestData(OutboundRequestHandle handle,
                      OutputStream stream)
               throws IOException

Writes to the specified stream any per-request data required by this connection for a request with the specified handle.

This method is invoked by ConnectionManager with the request output stream of the OutboundRequest that it creates for the request. This method can be used, for example, to convey per-request information about delegation, client authentication, or client privileges.

There may be multiple requests in progress concurrently over this connection, and data written to the specified stream may be buffered and multiplexed with data from other requests before being written to this connection's underlying output stream. Therefore, this method should only write data to the specified stream and must not read any data from this connection's underlying input stream; data can, however, be subsequently read with readResponseData.

Parameters:

handle - the handle for the request

stream - the request output stream of the request

Throws:

IOException - if an I/O exception occurs

SecurityException - if a security exception occurs

IllegalArgumentException - if the specified handle was not created for use with a connection endpoint equivalent to the one used to create this connection

NullPointerException - if handle or stream is null

readResponseData

IOException readResponseData(OutboundRequestHandle handle,
                             InputStream stream)
                      throws IOException

Reads from the specified stream any per-response data required by this connection for a request with the specified handle.

This method returns null if the information read (if any) indicates that the constraints are satisfied, and it returns an exception if the constraints could not be satisfied. If an exception is returned rather than thrown, the delivery status of a corresponding OutboundRequest will be false.

This method is invoked by ConnectionManager with the response input stream of the OutboundRequest that it creates for the request and the same handle that was passed to writeRequestData. This method can be used to read information produced by ServerConnection.processRequestData in response to the information sent by writeRequestData.

There may be multiple requests in progress concurrently over this connection, and data read from the specified stream may have been buffered and multiplexed with data from other requests being read from this connection's underlying input stream. Therefore, this method should only read data from the specified stream and must not write any data to this connection's underlying output stream.

Parameters:

handle - the handle for the request

stream - the response input stream of the request

Returns:

null if the constraints are satisfied, or an exception if the constraints could not be satisfied

Throws:

IOException - if an I/O exception occurs

SecurityException - if a security exception occurs

IllegalArgumentException - if the specified handle was not created for use with a connection endpoint equivalent to the one used to create this connection

NullPointerException - if handle or stream is null

close

void close()
    throws IOException

Closes this connection.

Throws:

IOException - if an I/O exception occurs