Class AprIoProcessor

java.lang.Object

org.apache.mina.core.polling.AbstractPollingIoProcessor<AprSession>

org.apache.mina.transport.socket.apr.AprIoProcessor

All Implemented Interfaces:

IoProcessor<AprSession>

public final class AprIoProcessor
extends AbstractPollingIoProcessor<AprSession>

The class in charge of processing socket level IO events for the AprSocketConnector

Field Summary

Fields

Modifier and Type	Field	Description
private final Map<Long, AprSession>	allSessions
private final long	bufferPool
private final Queue<AprSession>	polledSessions
private final long[]	polledSockets
private final long	pollset
private static final int	POLLSET_SIZE
private final long	pool
private boolean	toBeWakenUp
private final Object	wakeupLock
private final long	wakeupSocket

Fields inherited from class AbstractPollingIoProcessor

wakeupCalled

Constructor Summary

Constructors

Constructor	Description
AprIoProcessor(Executor executor)	Create a new instance of AprIoProcessor with a given Exector for handling I/Os events.

Method Summary

Modifier and Type	Method	Description
protected Iterator<AprSession>	allSessions()	Get an Iterator for the list of IoSession polled by this IoProcessor
protected int	allSessionsCount()	Get the number of IoSession polled by this IoProcessor
protected void	destroy(AprSession session)	Destroy the underlying client socket handle
protected void	doDispose()	Dispose the resources used by this IoProcessor for polling the client connections.
protected SessionState	getState(AprSession session)	Get the state of a session (One of OPENING, OPEN, CLOSING)
protected void	init(AprSession session)	Initialize the polling of a session.
protected boolean	isBrokenConnection()	Check that the select() has not exited immediately just because of a broken connection.
protected boolean	isInterestedInRead(AprSession session)	Tells if this session is registered for reading
protected boolean	isInterestedInWrite(AprSession session)	Tells if this session is registered for writing
protected boolean	isReadable(AprSession session)	Tells if the session ready for reading
protected boolean	isSelectorEmpty()	Say if the list of IoSession polled by this IoProcessor is empty
protected boolean	isWritable(AprSession session)	Tells if the session ready for writing
protected int	read(AprSession session, IoBuffer buffer)	Reads a sequence of bytes from a IoSession into the given IoBuffer.
protected void	registerNewSelector()	In the case we are using the java select() method, this method is used to trash the buggy selector and create a new one, registring all the sockets on it.
protected int	select()	poll those sessions forever
protected int	select(long timeout)	poll those sessions for the given timeout
protected Iterator<AprSession>	selectedSessions()	Get an Iterator for the list of IoSession found selected by the last call of AbstractPollingIoProcessor.select(long)
protected void	setInterestedInRead(AprSession session, boolean isInterested)	Set the session to be informed when a read event should be processed
protected void	setInterestedInWrite(AprSession session, boolean isInterested)	Set the session to be informed when a write event should be processed
private void	throwException(int code)
protected int	transferFile(AprSession session, FileRegion region, int length)	Write a part of a file to a IoSession, if the underlying API isn't supporting system calls like sendfile(), you can throw a UnsupportedOperationException so the file will be send using usual AbstractPollingIoProcessor.write(AbstractIoSession, IoBuffer, int) call.
protected void	wakeup()	Interrupt the AbstractPollingIoProcessor.select(long) call.
protected int	write(AprSession session, IoBuffer buf, int length)	Write a sequence of bytes to a IoSession, means to be called when a session was found ready for writing.

Methods inherited from class AbstractPollingIoProcessor

add, dispose, flush, isDisposed, isDisposing, remove, updateTrafficControl, updateTrafficMask, write

Methods inherited from class Object

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

Field Details

POLLSET_SIZE

private static final int POLLSET_SIZE

See Also:

• Constant Field Values

allSessions

private final Map<Long, AprSession> allSessions

wakeupLock

private final Object wakeupLock

wakeupSocket

private final long wakeupSocket

toBeWakenUp

private volatile boolean toBeWakenUp

pool

private final long pool

bufferPool

private final long bufferPool

pollset

private final long pollset

polledSockets

private final long[] polledSockets

polledSessions

private final Queue<AprSession> polledSessions

Constructor Details

AprIoProcessor

public AprIoProcessor(Executor executor)

Create a new instance of AprIoProcessor with a given Exector for handling I/Os events.

Parameters:

executor - the Executor for handling I/O events

Method Details

doDispose

protected void doDispose()

Dispose the resources used by this IoProcessor for polling the client connections. The implementing class doDispose method will be called.

Specified by:

doDispose in class AbstractPollingIoProcessor<AprSession>

select

protected int select()
              throws Exception

poll those sessions forever

Specified by:

select in class AbstractPollingIoProcessor<AprSession>

Returns:

The number of session ready for read or for write

Throws:

Exception - if some low level IO error occurs

select

protected int select(long timeout)
              throws Exception

poll those sessions for the given timeout

Specified by:

select in class AbstractPollingIoProcessor<AprSession>

Parameters:

timeout - milliseconds before the call timeout if no event appear

Returns:

The number of session ready for read or for write

Throws:

Exception - if some low level IO error occurs

isSelectorEmpty

protected boolean isSelectorEmpty()

Say if the list of IoSession polled by this IoProcessor is empty

Specified by:

isSelectorEmpty in class AbstractPollingIoProcessor<AprSession>

Returns:

true if at least a session is managed by this IoProcessor

wakeup

protected void wakeup()

Interrupt the AbstractPollingIoProcessor.select(long) call.

Specified by:

wakeup in class AbstractPollingIoProcessor<AprSession>

allSessions

protected Iterator<AprSession> allSessions()

Get an Iterator for the list of IoSession polled by this IoProcessor

Specified by:

allSessions in class AbstractPollingIoProcessor<AprSession>

Returns:

Iterator of IoSession

allSessionsCount

protected int allSessionsCount()

Get the number of IoSession polled by this IoProcessor

Specified by:

allSessionsCount in class AbstractPollingIoProcessor<AprSession>

Returns:

the number of sessions attached to this IoProcessor

selectedSessions

protected Iterator<AprSession> selectedSessions()

Get an Iterator for the list of IoSession found selected by the last call of AbstractPollingIoProcessor.select(long)

Specified by:

selectedSessions in class AbstractPollingIoProcessor<AprSession>

Returns:

Iterator of IoSession read for I/Os operation

init

protected void init(AprSession session)
             throws Exception

Description copied from class: AbstractPollingIoProcessor

Initialize the polling of a session. Add it to the polling process.

Specified by:

init in class AbstractPollingIoProcessor<AprSession>

Parameters:

session - the IoSession to add to the polling

Throws:

Exception - any exception thrown by the underlying system calls

destroy

protected void destroy(AprSession session)
                throws Exception

Destroy the underlying client socket handle

Specified by:

destroy in class AbstractPollingIoProcessor<AprSession>

Parameters:

session - the IoSession

Throws:

Exception - any exception thrown by the underlying system calls

getState

protected SessionState getState(AprSession session)

Get the state of a session (One of OPENING, OPEN, CLOSING)

Specified by:

getState in class AbstractPollingIoProcessor<AprSession>

Parameters:

session - the IoSession to inspect

Returns:

the state of the session

isReadable

protected boolean isReadable(AprSession session)

Tells if the session ready for reading

Specified by:

isReadable in class AbstractPollingIoProcessor<AprSession>

Parameters:

session - the queried session

Returns:

true is ready, false if not ready

isWritable

protected boolean isWritable(AprSession session)

Tells if the session ready for writing

Specified by:

isWritable in class AbstractPollingIoProcessor<AprSession>

Parameters:

session - the queried session

Returns:

true is ready, false if not ready

isInterestedInRead

protected boolean isInterestedInRead(AprSession session)

Tells if this session is registered for reading

Specified by:

isInterestedInRead in class AbstractPollingIoProcessor<AprSession>

Parameters:

session - the queried session

Returns:

true is registered for reading

isInterestedInWrite

protected boolean isInterestedInWrite(AprSession session)

Tells if this session is registered for writing

Specified by:

isInterestedInWrite in class AbstractPollingIoProcessor<AprSession>

Parameters:

session - the queried session

Returns:

true is registered for writing

setInterestedInRead

protected void setInterestedInRead(AprSession session,
 boolean isInterested)
                            throws Exception

Set the session to be informed when a read event should be processed

Specified by:

setInterestedInRead in class AbstractPollingIoProcessor<AprSession>

Parameters:

session - the session for which we want to be interested in read events

isInterested - true for registering, false for removing

Throws:

Exception - If there was a problem while registering the session

setInterestedInWrite

protected void setInterestedInWrite(AprSession session,
 boolean isInterested)
                             throws Exception

Set the session to be informed when a write event should be processed

Specified by:

setInterestedInWrite in class AbstractPollingIoProcessor<AprSession>

Parameters:

session - the session for which we want to be interested in write events

isInterested - true for registering, false for removing

Throws:

Exception - If there was a problem while registering the session

read

protected int read(AprSession session,
 IoBuffer buffer)
            throws Exception

Reads a sequence of bytes from a IoSession into the given IoBuffer. Is called when the session was found ready for reading.

Specified by:

read in class AbstractPollingIoProcessor<AprSession>

Parameters:

session - the session to read

buffer - the buffer to fill

Returns:

the number of bytes read

Throws:

Exception - any exception thrown by the underlying system calls

write

protected int write(AprSession session,
 IoBuffer buf,
 int length)
             throws IOException

Write a sequence of bytes to a IoSession, means to be called when a session was found ready for writing.

Specified by:

write in class AbstractPollingIoProcessor<AprSession>

Parameters:

session - the session to write

buf - the buffer to write

length - the number of bytes to write can be superior to the number of bytes remaining in the buffer

Returns:

the number of byte written

Throws:

IOException - any exception thrown by the underlying system calls

transferFile

protected int transferFile(AprSession session,
 FileRegion region,
 int length)
                    throws Exception

Write a part of a file to a IoSession, if the underlying API isn't supporting system calls like sendfile(), you can throw a UnsupportedOperationException so the file will be send using usual AbstractPollingIoProcessor.write(AbstractIoSession, IoBuffer, int) call.

Specified by:

transferFile in class AbstractPollingIoProcessor<AprSession>

Parameters:

session - the session to write

region - the file region to write

length - the length of the portion to send

Returns:

the number of written bytes

Throws:

Exception - any exception thrown by the underlying system calls

throwException

private void throwException(int code)
                     throws IOException

Throws:

IOException

registerNewSelector

protected void registerNewSelector()

In the case we are using the java select() method, this method is used to trash the buggy selector and create a new one, registring all the sockets on it.

Specified by:

registerNewSelector in class AbstractPollingIoProcessor<AprSession>

isBrokenConnection

protected boolean isBrokenConnection()
                              throws IOException

Check that the select() has not exited immediately just because of a broken connection. In this case, this is a standard case, and we just have to loop.

Specified by:

isBrokenConnection in class AbstractPollingIoProcessor<AprSession>

Returns:

true if a connection has been brutally closed.

Throws:

IOException - If we got an exception