com.sun.grizzly
Class TCPSelectorHandler

java.lang.Object
  com.sun.grizzly.TCPSelectorHandler

All Implemented Interfaces:

Handler, LinuxSpinningWorkaround, SelectorHandler, PendingIOhandler, AttributeHolder, Copyable, SupportStateHolder<State>

Direct Known Subclasses:

ReusableTCPSelectorHandler, RoundRobinSelectorHandler, SSLSelectorHandler, UDPSelectorHandler

public class TCPSelectorHandler
extends Object
implements SelectorHandler, LinuxSpinningWorkaround

A SelectorHandler handles all java.nio.channels.Selector operations. One or more instance of a Selector are handled by SelectorHandler. The logic for processing of SelectionKey interest (OP_ACCEPT,OP_READ, etc.) is usually defined using an instance of SelectorHandler. This class represents a TCP implementation of a SelectorHandler. This class first bind a ServerSocketChannel to a TCP port and then start waiting for NIO events.

Author:

Jeanfrancois Arcand

Field Summary

protected AsyncQueueReader	asyncQueueReader AsyncQueueWriter
protected AsyncQueueWriter	asyncQueueWriter AsyncQueueWriter
protected Map<String,Object>	attributes Attributes, associated with the SelectorHandler instance
protected ConnectorInstanceHandler	connectorInstanceHandler The ConnectorInstanceHandler used to return a new or pooled ConnectorHandler
protected InetAddress	inet The inet address to use when binding.
protected ProtocolChainInstanceHandler	instanceHandler The ProtocolChainInstanceHandler used by this instance.
protected AtomicBoolean	isShutDown Flag, which shows whether shutdown was called for this SelectorHandler
protected int	linger The socket linger.
protected Logger	logger
protected LinkedTransferQueue<SelectionKeyOP>	opToRegister The list of SelectionKeyOP to register next time the Selector.select is invoked.
protected int	port The default TCP port.
protected int	receiveBufferSize The size to which to set the receive buffer If this value is not greater than 0, it is not used.
protected boolean	reuseAddress The socket reuseAddress
protected Role	role Is this used for client only or client/server operation.
protected SelectionKeyHandler	selectionKeyHandler The SelectionKeyHandler associated with this SelectorHandler.
protected Selector	selector The single Selector.
protected long	selectTimeout The Selector time out.
protected int	sendBufferSize The size to which to set the send buffer If this value is not greater than 0, it is not used.
protected ServerSocket	serverSocket The ServerSocket instance.
protected ServerSocketChannel	serverSocketChannel The ServerSocketChannel.
protected int	serverTimeout The server socket time out
protected int	socketTimeout The socket time out
protected int	ssBackLog Server socket backlog.
protected StateHolder<State>	stateHolder This SelectorHandler StateHolder, which is shared among SelectorHandler and its clones
protected boolean	tcpNoDelay The socket tcpDelay.
protected ExecutorService	threadPool The ExecutorService used by this instance.

Constructor Summary

TCPSelectorHandler()

TCPSelectorHandler(boolean isClient)
Create a TCPSelectorHandler only used with ConnectorHandler.

TCPSelectorHandler(Role role)
Create a TCPSelectorHandler only used with ConnectorHandler.

Method Summary

SelectableChannel	acceptWithoutRegistration(SelectionKey key) Accepts connection, without registering it for reading or writing
ConnectorHandler	acquireConnectorHandler() Return an instance of the default ConnectorHandler, which is the TCPConnectorHandler
void	addPendingIO(Runnable runnable)
void	addPendingKeyCancel(SelectionKey key)
protected static Role	boolean2Role(boolean isClient) Returns the Role, depending on isClient value
void	closeChannel(SelectableChannel channel) Closes SelectableChannel
void	configureChannel(SelectableChannel channel) Configure the channel operations.
protected void	connect(SocketAddress remoteAddress, SocketAddress localAddress, CallbackHandler callbackHandler) Register a CallBackHandler to this Selector.
void	copyTo(Copyable copy)
AsyncQueueReader	getAsyncQueueReader() Returns AsyncQueueReader associated with this SelectorHandler.
AsyncQueueWriter	getAsyncQueueWriter() Returns AsyncQueueWriter associated with this SelectorHandler.
Object	getAttribute(String key) Return an object based on a key.
Map<String,Object>	getAttributes() Return a Map of attribute name/value pairs.
protected Callable<ConnectorHandler>	getConnectorInstanceHandlerDelegate() Return factory object, which knows how to create ConnectorInstanceHandler corresponding to the protocol
InetAddress	getInet()
int	getLinger()
Logger	getLogger()
int	getPendingIOlimitPerThread() Max number of pendingIO tasks that will be executed per worker thread.
int	getPort()
int	getPortLowLevel() Deprecated. Use getPort
Class<? extends SelectionKeyHandler>	getPreferredSelectionKeyHandler() Get the preffered SelectionKeyHandler implementation for this SelectorHandler.
ProtocolChainInstanceHandler	getProtocolChainInstanceHandler() Return the ProtocolChainInstanceHandler
Role	getRole() Gets this SelectorHandler current role.
protected SelectableChannel	getSelectableChannel(SocketAddress remoteAddress, SocketAddress localAddress)
SelectionKeyHandler	getSelectionKeyHandler() Get the SelectionKeyHandler associated with this SelectorHandler.
Selector	getSelector() Gets the underlying selector.
long	getSelectTimeout()
int	getServerTimeout()
int	getSocketTimeout()
int	getSpinRate() Returns the Selector spinrate
int	getSsBackLog()
StateHolder<State>	getStateHolder()
ExecutorService	getThreadPool() Return the ExecutorService used to execute this SelectorHandler's SelectionKey ops
protected void	invokeAsyncQueueReader(NIOContext context) Invoke a AsyncQueueReader
protected void	invokeAsyncQueueWriter(NIOContext context) Invoke a AsyncQueueWriter
protected void	invokeCallbackHandler(CallbackHandler callbackHandler, NIOContext context) Invoke a CallbackHandler via a Context instance.
boolean	isFinishIOUsingCurrentThread() Return true by default, meaning the WorkerThread used to execute the I/O operation will also complete the I/O operations.
boolean	isOpen() Is the Selector open.
boolean	isReuseAddress()
boolean	isTcpNoDelay() Return the tcpNoDelay value used by the underlying accepted Sockets.
SelectionKey	keyFor(SelectableChannel channel) Returns SelectionKey, which represents binding between the SelectableChannel and this SelectorHandler
Set<SelectionKey>	keys() Return the set of SelectionKey registered on this Selector.
boolean	onAcceptInterest(SelectionKey key, Context ctx) Handle OP_ACCEPT.
boolean	onConnectInterest(SelectionKey key, Context ctx) Handle OP_CONNECT.
protected void	onConnectOp(Context ctx, SelectionKeyOP.ConnectSelectionKeyOP selectionKeyOp) Handle new OP_CONNECT ops.
boolean	onReadInterest(SelectionKey key, Context ctx) Handle OP_READ.
boolean	onWriteInterest(SelectionKey key, Context ctx) Handle OP_WRITE.
void	pause() Pause this SelectorHandler
protected NIOContext	pollContext(Context serverContext, SelectionKey key, Context.OpType opType) Polls Context from pool and initializes it.
void	postSelect(Context ctx) Invoked after Selector.select().
void	preSelect(Context ctx) Before invoking Selector.select(long), make sure the ServerSocketChannel has been created.
protected void	processPendingOperations(Context ctx)
Controller.Protocol	protocol() A token decribing the protocol supported by an implementation of this interface
void	register(SelectableChannel channel, int ops) Register the SelectableChannel on the Selector.
void	register(SelectionKey key, int ops) Register a SelectionKey to this Selector. Storing each interest type in different queues removes the need of wrapper (SelectionKeyOP) while lowering thread contention due to the load is spread out on different queues.
void	releaseConnectorHandler(ConnectorHandler connectorHandler) Release a ConnectorHandler.
Object	removeAttribute(String key) Remove a key/value object.
void	resetSpinCounter() Resets the spincounter
void	resume() Resume this SelectorHandler
Set<SelectionKey>	select(Context ctx) Execute the Selector.select(...) operations.
void	setAttribute(String key, Object value) Set a key/value object.
void	setAttributes(Map<String,Object> attributes) Set a Map of attribute name/value pairs.
void	setFinishIOUsingCurrentThread(boolean finishIOUsingCurrentThread) Set to false to use a the kernel thread pool to finish pending I/O operations, like closing connection.
void	setInet(InetAddress inet)
void	setLinger(int linger)
void	setLogger(Logger logger)
void	setMaxAcceptRetries(int maxAcceptRetries) Max number of accept() failures before abording.
void	setPendingIOlimitPerThread(int pendingIOlimitPerThread) Max number of pendingIO tasks that will be executed per worker thread.
void	setPort(int port)
void	setProtocolChainInstanceHandler(ProtocolChainInstanceHandler instanceHandler) Set the ProtocolChainInstanceHandler to use for creating instance of ProtocolChain.
void	setReceiveBufferSize(int size) Sets the receiveBufferSize to the specified value
void	setReuseAddress(boolean reuseAddress)
void	setRole(Role role) Sets this SelectorHandler current role.
void	setSelectionKeyHandler(SelectionKeyHandler selectionKeyHandler) Set SelectionKeyHandler associated with this SelectorHandler.
void	setSelector(Selector selector) Sets the underlying Selector
void	setSelectTimeout(long selectTimeout)
void	setSendBufferSize(int size) Sets the sendBufferSize to the specified value
void	setServerTimeout(int serverTimeout)
void	setSocketTimeout(int socketTimeout)
void	setSsBackLog(int ssBackLog)
void	setTcpNoDelay(boolean tcpNoDelay) Enable (true) or disable (false) the underlying Socket's tcpNoDelay.
void	setThreadPool(ExecutorService threadPool) Set the ExecutorService used to execute this SelectorHandler's SelectionKey ops
void	shutdown() Shuntdown this instance by closing its Selector and associated channels.
void	workaroundSelectorSpin() Execute workaround for selector spin issue

Methods inherited from class java.lang.Object

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

Field Detail

connectorInstanceHandler

protected ConnectorInstanceHandler connectorInstanceHandler

The ConnectorInstanceHandler used to return a new or pooled ConnectorHandler

opToRegister

protected final LinkedTransferQueue<SelectionKeyOP> opToRegister

The list of SelectionKeyOP to register next time the Selector.select is invoked. can be combined read+write interest or Connect

tcpNoDelay

protected boolean tcpNoDelay

The socket tcpDelay. Default value for tcpNoDelay is disabled (set to true).

reuseAddress

protected boolean reuseAddress

The socket reuseAddress

linger

protected int linger

The socket linger.

socketTimeout

protected int socketTimeout

The socket time out

logger

protected Logger logger

serverTimeout

protected int serverTimeout

The server socket time out

inet

protected InetAddress inet

The inet address to use when binding.

port

protected int port

The default TCP port.

serverSocket

protected ServerSocket serverSocket

The ServerSocket instance.

serverSocketChannel

protected ServerSocketChannel serverSocketChannel

The ServerSocketChannel.

selector

protected Selector selector

The single Selector.

selectTimeout

protected long selectTimeout

The Selector time out.

ssBackLog

protected int ssBackLog

Server socket backlog.

role

protected Role role

Is this used for client only or client/server operation.

selectionKeyHandler

protected SelectionKeyHandler selectionKeyHandler

The SelectionKeyHandler associated with this SelectorHandler.

instanceHandler

protected ProtocolChainInstanceHandler instanceHandler

The ProtocolChainInstanceHandler used by this instance. If not set, and instance of the DefaultInstanceHandler will be created.

threadPool

protected ExecutorService threadPool

The ExecutorService used by this instance. If null - Controller's ExecutorService will be used

asyncQueueWriter

protected AsyncQueueWriter asyncQueueWriter

AsyncQueueWriter

asyncQueueReader

protected AsyncQueueReader asyncQueueReader

AsyncQueueWriter

attributes

protected Map<String,Object> attributes

Attributes, associated with the SelectorHandler instance

stateHolder

protected StateHolder<State> stateHolder

This SelectorHandler StateHolder, which is shared among SelectorHandler and its clones

isShutDown

protected final AtomicBoolean isShutDown

Flag, which shows whether shutdown was called for this SelectorHandler

sendBufferSize

protected int sendBufferSize

The size to which to set the send buffer If this value is not greater than 0, it is not used.

receiveBufferSize

protected int receiveBufferSize

The size to which to set the receive buffer If this value is not greater than 0, it is not used.

Constructor Detail

TCPSelectorHandler

public TCPSelectorHandler()

TCPSelectorHandler

public TCPSelectorHandler(boolean isClient)

Create a TCPSelectorHandler only used with ConnectorHandler.

Parameters:

isClient - true if this SelectorHandler is only used to handle ConnectorHandler.

TCPSelectorHandler

public TCPSelectorHandler(Role role)

Create a TCPSelectorHandler only used with ConnectorHandler.

Parameters:

role - the TCPSelectorHandler Role

Method Detail

copyTo

public void copyTo(Copyable copy)

Specified by:

copyTo in interface Copyable

keys

public Set<SelectionKey> keys()

Return the set of SelectionKey registered on this Selector.

Specified by:

keys in interface SelectorHandler

isOpen

public boolean isOpen()

Is the Selector open.

Specified by:

isOpen in interface SelectorHandler

Returns:

true / false

preSelect

public void preSelect(Context ctx)
               throws IOException

Before invoking Selector.select(long), make sure the ServerSocketChannel has been created. If true, then register all SelectionKey to the Selector.

Specified by:

preSelect in interface SelectorHandler

Parameters:

ctx - Context

Throws:

IOException

processPendingOperations

protected void processPendingOperations(Context ctx)
                                 throws IOException

Parameters:

ctx -

Throws:

IOException

onConnectOp

protected void onConnectOp(Context ctx,
                           SelectionKeyOP.ConnectSelectionKeyOP selectionKeyOp)
                    throws IOException

Handle new OP_CONNECT ops.

Throws:

IOException

select

public Set<SelectionKey> select(Context ctx)
                         throws IOException

Execute the Selector.select(...) operations.

Specified by:

select in interface SelectorHandler

Parameters:

ctx - Context

Returns:

Set of SelectionKey

Throws:

IOException

postSelect

public void postSelect(Context ctx)

Invoked after Selector.select().

Specified by:

postSelect in interface SelectorHandler

Parameters:

ctx - Context

addPendingIO

public void addPendingIO(Runnable runnable)

Specified by:

addPendingIO in interface PendingIOhandler

addPendingKeyCancel

public void addPendingKeyCancel(SelectionKey key)

Specified by:

addPendingKeyCancel in interface PendingIOhandler

register

public void register(SelectionKey key,
                     int ops)

Register a SelectionKey to this Selector.
Storing each interest type in different queues removes the need of wrapper (SelectionKeyOP) while lowering thread contention due to the load is spread out on different queues.

Specified by:

register in interface SelectorHandler

Parameters:

key -

ops -

register

public void register(SelectableChannel channel,
                     int ops)

Description copied from interface: SelectorHandler

Register the SelectableChannel on the Selector.

Specified by:

register in interface SelectorHandler

ops - interested operations

connect

protected void connect(SocketAddress remoteAddress,
                       SocketAddress localAddress,
                       CallbackHandler callbackHandler)
                throws IOException

Register a CallBackHandler to this Selector.

Parameters:

remoteAddress - remote address to connect

localAddress - local address to bin

callbackHandler - CallbackHandler

Throws:

IOException

getSelectableChannel

protected SelectableChannel getSelectableChannel(SocketAddress remoteAddress,
                                                 SocketAddress localAddress)
                                          throws IOException

Throws:

IOException

pause

public void pause()

Pause this SelectorHandler

Specified by:

pause in interface SelectorHandler

resume

public void resume()

Resume this SelectorHandler

Specified by:

resume in interface SelectorHandler

getStateHolder

public StateHolder<State> getStateHolder()

Specified by:

getStateHolder in interface SupportStateHolder<State>

shutdown

public void shutdown()

Shuntdown this instance by closing its Selector and associated channels.

Specified by:

shutdown in interface SelectorHandler

acceptWithoutRegistration

public SelectableChannel acceptWithoutRegistration(SelectionKey key)
                                            throws IOException

Accepts connection, without registering it for reading or writing

Specified by:

acceptWithoutRegistration in interface SelectorHandler

Returns:

accepted SelectableChannel

Throws:

IOException

onAcceptInterest

public boolean onAcceptInterest(SelectionKey key,
                                Context ctx)
                         throws IOException

Handle OP_ACCEPT.

Specified by:

onAcceptInterest in interface SelectorHandler

Parameters:

ctx - Context

key - SelectionKey

Returns:

always returns false

Throws:

IOException

onReadInterest

public boolean onReadInterest(SelectionKey key,
                              Context ctx)
                       throws IOException

Handle OP_READ.

Specified by:

onReadInterest in interface SelectorHandler

Parameters:

ctx - Context

key - SelectionKey

Returns:

false if handled by a CallbackHandler, otherwise true

Throws:

IOException

onWriteInterest

public boolean onWriteInterest(SelectionKey key,
                               Context ctx)
                        throws IOException

Handle OP_WRITE.

Specified by:

onWriteInterest in interface SelectorHandler

Parameters:

key - SelectionKey

ctx - Context

Returns:

true if and only if the ProtocolChain must be invoked after executing this method.

Throws:

IOException

onConnectInterest

public boolean onConnectInterest(SelectionKey key,
                                 Context ctx)
                          throws IOException

Handle OP_CONNECT.

Specified by:

onConnectInterest in interface SelectorHandler

Parameters:

key - SelectionKey

ctx - Context

Returns:

true if and only if the ProtocolChain must be invoked after executing this method.

Throws:

IOException

invokeCallbackHandler

protected void invokeCallbackHandler(CallbackHandler callbackHandler,
                                     NIOContext context)
                              throws IOException

Invoke a CallbackHandler via a Context instance.

Parameters:

context - Context

Throws:

IOException

invokeAsyncQueueReader

protected void invokeAsyncQueueReader(NIOContext context)
                               throws IOException

Invoke a AsyncQueueReader

Parameters:

context - Context

Throws:

IOException

invokeAsyncQueueWriter

protected void invokeAsyncQueueWriter(NIOContext context)
                               throws IOException

Invoke a AsyncQueueWriter

Parameters:

context - Context

Throws:

IOException

acquireConnectorHandler

public ConnectorHandler acquireConnectorHandler()

Return an instance of the default ConnectorHandler, which is the TCPConnectorHandler

Specified by:

acquireConnectorHandler in interface SelectorHandler

Returns:

ConnectorHandler

releaseConnectorHandler

public void releaseConnectorHandler(ConnectorHandler connectorHandler)

Release a ConnectorHandler.

Specified by:

releaseConnectorHandler in interface SelectorHandler

Parameters:

connectorHandler - ConnectorHandler

protocol

public Controller.Protocol protocol()

A token decribing the protocol supported by an implementation of this interface

Specified by:

protocol in interface SelectorHandler

Returns:

SelectorHandler supported protocol

configureChannel

public void configureChannel(SelectableChannel channel)
                      throws IOException

Configure the channel operations.

Specified by:

configureChannel in interface SelectorHandler

Parameters:

channel - SelectableChannel to configure

Throws:

IOException - on possible configuration related error

getPendingIOlimitPerThread

public int getPendingIOlimitPerThread()

Max number of pendingIO tasks that will be executed per worker thread.

Returns:

setPendingIOlimitPerThread

public void setPendingIOlimitPerThread(int pendingIOlimitPerThread)

Max number of pendingIO tasks that will be executed per worker thread.

Parameters:

pendingIOlimitPerThread -

getSelector

public final Selector getSelector()

Description copied from interface: SelectorHandler

Gets the underlying selector.

Specified by:

getSelector in interface SelectorHandler

Returns:

underlying Selector

setSelector

public final void setSelector(Selector selector)

Description copied from interface: SelectorHandler

Sets the underlying Selector

Specified by:

setSelector in interface SelectorHandler

Parameters:

selector - underlying Selector

getAsyncQueueReader

public AsyncQueueReader getAsyncQueueReader()

Returns AsyncQueueReader associated with this SelectorHandler. Method will return null, if this SelectorHandler is not running.

Specified by:

getAsyncQueueReader in interface SelectorHandler

Returns:

AsyncQueueReader

getAsyncQueueWriter

public AsyncQueueWriter getAsyncQueueWriter()

Returns AsyncQueueWriter associated with this SelectorHandler. Method will return null, if this SelectorHandler is not running.

Specified by:

getAsyncQueueWriter in interface SelectorHandler

Returns:

AsyncQueueWriter

getSelectTimeout

public long getSelectTimeout()

setSelectTimeout

public void setSelectTimeout(long selectTimeout)

getServerTimeout

public int getServerTimeout()

setServerTimeout

public void setServerTimeout(int serverTimeout)

getInet

public InetAddress getInet()

setInet

public void setInet(InetAddress inet)

getRole

public Role getRole()

Gets this SelectorHandler current role. TCPSelectorHandler could act as client, which corresponds to Role.CLIENT or client-server, which corresponds to the Role.CLIENT_SERVER

Returns:

the Role

setRole

public void setRole(Role role)

Sets this SelectorHandler current role. TCPSelectorHandler could act as client, which corresponds to Role.CLIENT or client-server, which corresponds to the Role.CLIENT_SERVER

Parameters:

role - the Role

getPortLowLevel

public int getPortLowLevel()

Deprecated. Use getPort

Returns port number SelectorHandler is listening on Similar to getPort(), but getting port number directly from connection (ServerSocket, DatagramSocket). So if default port number 0 was set during initialization, then getPort() will return 0, but getPortLowLevel() will return port number assigned by OS.

Returns:

port number or -1 if SelectorHandler was not initialized for accepting connections.

getPort

public int getPort()

setPort

public void setPort(int port)

getSsBackLog

public int getSsBackLog()

setSsBackLog

public void setSsBackLog(int ssBackLog)

isTcpNoDelay

public boolean isTcpNoDelay()

Return the tcpNoDelay value used by the underlying accepted Sockets. Also see setTcpNoDelay(boolean tcpNoDelay)

setTcpNoDelay

public void setTcpNoDelay(boolean tcpNoDelay)

Enable (true) or disable (false) the underlying Socket's tcpNoDelay. Default value for tcpNoDelay is enabled (set to true), as according to the performance tests, it performs better for most cases. The Connector side should also set tcpNoDelay the same as it is set here whenever possible.

getLinger

public int getLinger()

setLinger

public void setLinger(int linger)

getSocketTimeout

public int getSocketTimeout()

setSocketTimeout

public void setSocketTimeout(int socketTimeout)

getLogger

public Logger getLogger()

setLogger

public void setLogger(Logger logger)

isReuseAddress

public boolean isReuseAddress()

setReuseAddress

public void setReuseAddress(boolean reuseAddress)

getThreadPool

public ExecutorService getThreadPool()

Return the ExecutorService used to execute this SelectorHandler's SelectionKey ops

Specified by:

getThreadPool in interface SelectorHandler

Returns:

The thread pool to use, or null if the Controller's ExecutorService should be used.

setThreadPool

public void setThreadPool(ExecutorService threadPool)

Set the ExecutorService used to execute this SelectorHandler's SelectionKey ops

Specified by:

setThreadPool in interface SelectorHandler

getPreferredSelectionKeyHandler

public Class<? extends SelectionKeyHandler> getPreferredSelectionKeyHandler()

Get the preffered SelectionKeyHandler implementation for this SelectorHandler.

Specified by:

getPreferredSelectionKeyHandler in interface SelectorHandler

getSelectionKeyHandler

public SelectionKeyHandler getSelectionKeyHandler()

Get the SelectionKeyHandler associated with this SelectorHandler.

Specified by:

getSelectionKeyHandler in interface SelectorHandler

setSelectionKeyHandler

public void setSelectionKeyHandler(SelectionKeyHandler selectionKeyHandler)

Set SelectionKeyHandler associated with this SelectorHandler.

Specified by:

setSelectionKeyHandler in interface SelectorHandler

setProtocolChainInstanceHandler

public void setProtocolChainInstanceHandler(ProtocolChainInstanceHandler instanceHandler)

Set the ProtocolChainInstanceHandler to use for creating instance of ProtocolChain.

Specified by:

setProtocolChainInstanceHandler in interface SelectorHandler

getProtocolChainInstanceHandler

public ProtocolChainInstanceHandler getProtocolChainInstanceHandler()

Return the ProtocolChainInstanceHandler

Specified by:

getProtocolChainInstanceHandler in interface SelectorHandler

closeChannel

public void closeChannel(SelectableChannel channel)

Closes SelectableChannel

Specified by:

closeChannel in interface SelectorHandler

pollContext

protected NIOContext pollContext(Context serverContext,
                                 SelectionKey key,
                                 Context.OpType opType)

Polls Context from pool and initializes it.

Parameters:

serverContext - Controller context

key - SelectionKey

Returns:

Context

getConnectorInstanceHandlerDelegate

protected Callable<ConnectorHandler> getConnectorInstanceHandlerDelegate()

Return factory object, which knows how to create ConnectorInstanceHandler corresponding to the protocol

Returns:

factory

removeAttribute

public Object removeAttribute(String key)

Remove a key/value object. Method is not thread safe

Specified by:

removeAttribute in interface AttributeHolder

Parameters:

key - - name of an attribute

Returns:

attribute which has been removed

setAttribute

public void setAttribute(String key,
                         Object value)

Set a key/value object. Method is not thread safe

Specified by:

setAttribute in interface AttributeHolder

Parameters:

key - - name of an attribute

value - - value of named attribute

getAttribute

public Object getAttribute(String key)

Return an object based on a key. Method is not thread safe

Specified by:

getAttribute in interface AttributeHolder

Parameters:

key - - name of an attribute

Returns:

- attribute value for the key, null if key does not exist in attributes

setAttributes

public void setAttributes(Map<String,Object> attributes)

Set a Map of attribute name/value pairs. Old AttributeHolder values will not be available. Later changes of this Map will lead to changes to the current AttributeHolder.

Specified by:

setAttributes in interface AttributeHolder

Parameters:

attributes - - map of name/value pairs

getAttributes

public Map<String,Object> getAttributes()

Return a Map of attribute name/value pairs. Updates, performed on the returned Map will be reflected in this AttributeHolder

Specified by:

getAttributes in interface AttributeHolder

Returns:

- Map of attribute name/value pairs

boolean2Role

protected static Role boolean2Role(boolean isClient)

Returns the Role, depending on isClient value

Parameters:

isClient - true>tt>, if this SelectorHandler works in the client mode, or false otherwise.

Returns:

Role

resetSpinCounter

public void resetSpinCounter()

Resets the spincounter

Specified by:

resetSpinCounter in interface LinuxSpinningWorkaround

getSpinRate

public int getSpinRate()

Returns the Selector spinrate

Specified by:

getSpinRate in interface LinuxSpinningWorkaround

Returns:

workaroundSelectorSpin

public void workaroundSelectorSpin()
                            throws IOException

Execute workaround for selector spin issue

Specified by:

workaroundSelectorSpin in interface LinuxSpinningWorkaround

Throws:

IOException

keyFor

public SelectionKey keyFor(SelectableChannel channel)

Returns SelectionKey, which represents binding between the SelectableChannel and this SelectorHandler

Specified by:

keyFor in interface SelectorHandler

Parameters:

channel - SelectableChannel

Returns:

SelectionKey, which represents binding between the SelectableChannel and this SelectorHandler

setSendBufferSize

public void setSendBufferSize(int size)

Sets the sendBufferSize to the specified value

Parameters:

size - the size to which to set the send buffer. This value should be greater than 0.

setReceiveBufferSize

public void setReceiveBufferSize(int size)

Sets the receiveBufferSize to the specified value

Parameters:

size - the size to which to set the receive buffer. This value should be greater than 0.

isFinishIOUsingCurrentThread

public boolean isFinishIOUsingCurrentThread()

Return true by default, meaning the WorkerThread used to execute the I/O operation will also complete the I/O operations. Setting to false delegate the task to the kernel thread pool.

Returns:

the finishIOUsingCurrentThread

setFinishIOUsingCurrentThread

public void setFinishIOUsingCurrentThread(boolean finishIOUsingCurrentThread)

Set to false to use a the kernel thread pool to finish pending I/O operations, like closing connection.

Parameters:

finishIOUsingCurrentThread - the finishIOUsingCurrentThread to set

setMaxAcceptRetries

public void setMaxAcceptRetries(int maxAcceptRetries)

Max number of accept() failures before abording.

Parameters:

maxAcceptRetries -