org.apache.http.nio.reactor

Interface IOSession

All Known Implementing Classes:

IOSessionImpl, SSLIOSession, SSLIOSession

public interface IOSession

IOSession interface represents a sequence of logically related data exchanges between two end points.

The channel associated with implementations of this interface can be used to read data from and write data to the session.

I/O sessions are not bound to an execution thread, therefore one cannot use the context of the thread to store a session's state. All details about a particular session must be stored within the session itself, usually using execution context associated with it.

Implementations of this interface are expected to be threading safe.

Since:

4.0

Field Summary

Fields

Modifier and Type	Field and Description
static int	ACTIVE
static String	ATTACHMENT_KEY Name of the context attribute key, which can be used to obtain the session attachment object.
static int	CLOSED
static int	CLOSING

Method Summary

Methods

Modifier and Type	Method and Description
ByteChannel	channel() Returns the underlying I/O channel associated with this session.
void	clearEvent(int op) Clears interest in a particular I/O event type by updating the event mask associated with the session.
void	close() Terminates the session gracefully and closes the underlying I/O channel.
Object	getAttribute(String name) Returns the value of the attribute with the given name.
int	getEventMask() Returns mask of I/O evens this session declared interest in.
SocketAddress	getLocalAddress() Returns local address.
SocketAddress	getRemoteAddress() Returns address of the remote peer.
int	getSocketTimeout() Returns value of the socket timeout in milliseconds.
int	getStatus() Returns status of the session:
boolean	hasBufferedInput() Determines if the input buffer associated with the session contains data.
boolean	hasBufferedOutput() Determines if the output buffer associated with the session contains data.
boolean	isClosed() Determines if the session has been terminated.
Object	removeAttribute(String name) Removes attribute with the given name.
void	setAttribute(String name, Object obj) This method can be used to associate a particular object with the session by the given attribute name.
void	setBufferStatus(SessionBufferStatus status) Quite often I/O sessions need to maintain internal I/O buffers in order to transform input / output data prior to returning it to the consumer or writing it to the underlying channel.
void	setEvent(int op) Declares interest in a particular I/O event type by updating the event mask associated with the session.
void	setEventMask(int ops) Declares interest in I/O event notifications by setting the event mask associated with the session
void	setSocketTimeout(int timeout) Sets value of the socket timeout in milliseconds.
void	shutdown() Terminates the session by shutting down the underlying I/O channel.

Field Detail

ATTACHMENT_KEY

static final String ATTACHMENT_KEY

Name of the context attribute key, which can be used to obtain the session attachment object.

See Also:

Constant Field Values

ACTIVE

static final int ACTIVE

See Also:

Constant Field Values

CLOSING

static final int CLOSING

See Also:

Constant Field Values

CLOSED

static final int CLOSED

See Also:

Constant Field Values

Method Detail

channel

ByteChannel channel()

Returns the underlying I/O channel associated with this session.

Returns:

the I/O channel.

getRemoteAddress

SocketAddress getRemoteAddress()

Returns address of the remote peer.

Returns:

socket address.

getLocalAddress

SocketAddress getLocalAddress()

Returns local address.

Returns:

socket address.

getEventMask

int getEventMask()

Returns mask of I/O evens this session declared interest in.

Returns:

I/O event mask.

setEventMask

void setEventMask(int ops)

Declares interest in I/O event notifications by setting the event mask associated with the session

Parameters:

ops - new I/O event mask.

setEvent

void setEvent(int op)

Declares interest in a particular I/O event type by updating the event mask associated with the session.

Parameters:

op - I/O event type.

clearEvent

void clearEvent(int op)

Clears interest in a particular I/O event type by updating the event mask associated with the session.

Parameters:

op - I/O event type.

close

void close()

Terminates the session gracefully and closes the underlying I/O channel. This method ensures that session termination handshake, such as the one used by the SSL/TLS protocol, is correctly carried out.

shutdown

void shutdown()

Terminates the session by shutting down the underlying I/O channel.

getStatus

int getStatus()

Returns status of the session:

ACTIVE: session is active.

CLOSING: session is being closed.

CLOSED: session has been terminated.

Returns:

session status.

isClosed

boolean isClosed()

Determines if the session has been terminated.

Returns:

true if the session has been terminated, false otherwise.

getSocketTimeout

int getSocketTimeout()

Returns value of the socket timeout in milliseconds. The value of 0 signifies the session cannot time out.

Returns:

socket timeout.

setSocketTimeout

void setSocketTimeout(int timeout)

Sets value of the socket timeout in milliseconds. The value of 0 signifies the session cannot time out.

Parameters:

timeout - socket timeout.

setBufferStatus

void setBufferStatus(SessionBufferStatus status)

Quite often I/O sessions need to maintain internal I/O buffers in order to transform input / output data prior to returning it to the consumer or writing it to the underlying channel. Memory management in HttpCore NIO is based on the fundamental principle that the data consumer can read only as much input data as it can process without having to allocate more memory. That means, quite often some input data may remain unread in one of the internal or external session buffers. The I/O reactor can query the status of these session buffers, and make sure the consumer gets notified correctly as more data gets stored in one of the session buffers, thus allowing the consumer to read the remaining data once it is able to process it

I/O sessions can be made aware of the status of external session buffers using the SessionBufferStatus interface.

Parameters:

status -

hasBufferedInput

boolean hasBufferedInput()

Determines if the input buffer associated with the session contains data.

Returns:

true if the session input buffer contains data, false otherwise.

hasBufferedOutput

boolean hasBufferedOutput()

Determines if the output buffer associated with the session contains data.

Returns:

true if the session output buffer contains data, false otherwise.

setAttribute

void setAttribute(String name,
                Object obj)

This method can be used to associate a particular object with the session by the given attribute name.

I/O sessions are not bound to an execution thread, therefore one cannot use the context of the thread to store a session's state. All details about a particular session must be stored within the session itself.

Parameters:

name - name of the attribute.

obj - value of the attribute.

getAttribute

Object getAttribute(String name)

Returns the value of the attribute with the given name. The value can be null if not set.

The value of the session attachment object can be obtained using ATTACHMENT_KEY name.

Parameters:

name - name of the attribute.

Returns:

value of the attribute.

See Also:

setAttribute(String, Object)

removeAttribute

Object removeAttribute(String name)

Removes attribute with the given name.

Parameters:

name - name of the attribute to be removed.

Returns:

value of the removed attribute.

See Also:

setAttribute(String, Object)