com.cosylab.epics.caj

Class CAJContext

java.lang.Object

gov.aps.jca.Context

com.cosylab.epics.caj.CAJContext

All Implemented Interfaces:

CAJConstants, CAContext, LoggerProvider, gov.aps.jca.configuration.Configurable

public class CAJContext
extends gov.aps.jca.Context
implements CAContext, CAJConstants, gov.aps.jca.configuration.Configurable

Implementation of CAJ JCA Context.

Version:

$id$

Author:

Matej Sekoranja

Field Summary

Fields

Modifier and Type	Field and Description
protected String	addressList A space-separated list of broadcast address for process variable name resolution.
protected boolean	autoAddressList Define whether or not the network interfaces should be discovered at runtime.
protected Map	beaconHandlers Beacon handler map.
protected float	beaconPeriod Period in second between two beacon signals.
protected BroadcastTransport	broadcastTransport Broadcast transport needed for channel searches.
protected CachedByteBufferAllocator	cachedBufferAllocator Cached byte buffer allocator.
static String	CAJ_SINGLE_THREADED_MODEL String value of the JVM property key to turn on single threaded model.
protected IntHashMap	channelsByCID Map of channels (keys are CIDs).
protected Map	channelsByName Map of channels (keys are names).
protected float	connectionTimeout If the context doesn't see a beacon from a server that it is connected to for connectionTimeout seconds then a state-of-health message is sent to the server over TCP/IP.
protected CAConnector	connector CA connector (creates CA virtual circuit).
protected ArrayList	contextExceptionListeners List of context exception listeners.
protected ArrayList	contextMessageListeners List of context message listeners.
protected gov.aps.jca.event.EventDispatcher	eventDispatcher Event dispatcher.
protected LeaderFollowersThreadPool	leaderFollowersThreadPool Leader/followers thread pool.
protected Logger	logger Context logger.
protected int	maxArrayBytes Length in bytes of the maximum array size that may pass through CA.
protected IntHashMap	pendingResponseRequests Map of pending response requests (keys are IOID).
protected Reactor	reactor Reactor.
protected boolean	registrationConfirmed Registration confirmation status.
protected int	repeaterPort Port number for the repeater to listen to.
protected int	serverPort Port number for the server to listen to.
protected Timer	timer Timer.
protected CATransportRegistry	transportRegistry CA transport (virtual circuit) registry.
static gov.aps.jca.Version	VERSION Version.

Fields inherited from interface com.cosylab.epics.caj.CAJConstants

CAJ_DEBUG, CAJ_STRIP_HOSTNAME

Constructor Summary

Constructors

Constructor and Description
CAJContext() Constructor.

Method Summary

Methods

Modifier and Type	Method and Description
void	addContextExceptionListener(gov.aps.jca.event.ContextExceptionListener l)
void	addContextMessageListener(gov.aps.jca.event.ContextMessageListener l)
void	attachCurrentThread()
void	beaconAnomalyNotify() Called each time beacon anomaly is detected.
protected void	checkState() Check context state and tries to establish necessary state.
void	configure(gov.aps.jca.configuration.Configuration configuration)
gov.aps.jca.Channel	createChannel(String name, gov.aps.jca.event.ConnectionListener l, short priority)
void	decrementPendingRequests(int usedSequenceNumberIO) Decrement pending requests counter.
void	destroy()
void	destroyChannel(CAJChannel channel, boolean force) Destroy channel.
void	flushIO()
String	getAddressList() Get search address list.
CABeaconHandler	getBeaconHandler(InetSocketAddress responseFrom) Get (and if necessary create) beacon handler.
float	getBeaconPeriod() Get beacon period (in seconds).
int	getBroadcastPort() Get broadcast port.
BroadcastTransport	getBroadcastTransport() Broadcast transport.
CachedByteBufferAllocator	getCachedBufferAllocator() Get cached byte allocator.
CAJChannel	getChannel(int channelID) Searches for a channel with given channel ID.
CAJChannel	getChannel(String name, short priority, boolean acquire) Searches for a channel with given channel name.
gov.aps.jca.Channel[]	getChannels()
ChannelSearchManager	getChannelSearchManager() Get channel search manager.
float	getConnectionTimeout() Get connection timeout (in seconds).
gov.aps.jca.event.ContextExceptionListener[]	getContextExceptionListeners()
gov.aps.jca.event.ContextMessageListener[]	getContextMessageListeners()
gov.aps.jca.event.EventDispatcher	getEventDispatcher() Get event dispatcher.
int	getLastReceivedSequenceNumber(int seqNo) Set last UDP recived sequence number.
LeaderFollowersThreadPool	getLeaderFollowersThreadPool() Get LF thread pool.
Logger	getLogger() Get logger.
int	getMaxArrayBytes() Get max size of payload.
Reactor	getReactor() Get context reactor.
int	getRepeaterPort() Get repeater port.
ResponseRequest	getResponseRequest(int ioid) Searches for a response request with given channel IOID.
int	getServerPort() Get server port.
Timer	getTimer() Get timer.
CATransportRegistry	getTransportRegistry() Get CA transport (virtual circuit) registry.
gov.aps.jca.Version	getVersion() Get context version.
int	incrementPendingRequests() Increment pending requests counter.
void	initialize()
protected void	initializeLogger() Initialize context logger.
void	invalidateLastReceivedSequence() Invalidate last (UDP) received sequence.
boolean	isAutoAddressList() Get auto search-list flag.
boolean	isDestroyed() Get destruction status.
boolean	isInitialized() Get initialization status.
boolean	isRegistrationConfirmed() Get repeater registration status.
protected void	loadConfiguration() Load configuration.
void	notifyException(gov.aps.jca.event.ContextExceptionEvent event) Notifies context listeners about exception.
void	pendEvent(double timeout)
void	pendIO(double timeout)
void	poll()
void	printInfo(PrintStream out)
int	registerResponseRequest(ResponseRequest request) Register response request.
void	removeContextExceptionListener(gov.aps.jca.event.ContextExceptionListener l)
void	removeContextMessageListener(gov.aps.jca.event.ContextMessageListener l)
void	repeaterConfirm(InetSocketAddress responseFrom) Repeater registration confirmation.
void	searchResponse(int cid, int sid, short type, int count, short minorRevision, InetSocketAddress serverAddress) Search response from server (channel found).
void	setLastReceivedSequenceNumber(int seqNo) Set last UDP recived sequence number.
boolean	testIO()
ResponseRequest	unregisterResponseRequest(ResponseRequest request) Unregister response request.

Methods inherited from class gov.aps.jca.Context

createChannel, createChannel, createChannel, dispose, printInfo

Methods inherited from class java.lang.Object

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

Field Detail

VERSION

public static final gov.aps.jca.Version VERSION

Version.

CAJ_SINGLE_THREADED_MODEL

public static final String CAJ_SINGLE_THREADED_MODEL

String value of the JVM property key to turn on single threaded model.

See Also:

Constant Field Values

logger

protected Logger logger

Context logger.

addressList

protected String addressList

A space-separated list of broadcast address for process variable name resolution. Each address must be of the form: ip.number:port or host.name:port

autoAddressList

protected boolean autoAddressList

Define whether or not the network interfaces should be discovered at runtime.

connectionTimeout

protected float connectionTimeout

If the context doesn't see a beacon from a server that it is connected to for connectionTimeout seconds then a state-of-health message is sent to the server over TCP/IP. If this state-of-health message isn't promptly replied to then the context will assume that the server is no longer present on the network and disconnect.

beaconPeriod

protected float beaconPeriod

Period in second between two beacon signals.

repeaterPort

protected int repeaterPort

Port number for the repeater to listen to.

serverPort

protected int serverPort

Port number for the server to listen to.

maxArrayBytes

protected int maxArrayBytes

Length in bytes of the maximum array size that may pass through CA.

contextMessageListeners

protected ArrayList contextMessageListeners

List of context message listeners.

contextExceptionListeners

protected ArrayList contextExceptionListeners

List of context exception listeners.

eventDispatcher

protected gov.aps.jca.event.EventDispatcher eventDispatcher

Event dispatcher.

timer

protected Timer timer

Timer.

reactor

protected Reactor reactor

Reactor.

leaderFollowersThreadPool

protected LeaderFollowersThreadPool leaderFollowersThreadPool

Leader/followers thread pool.

registrationConfirmed

protected boolean registrationConfirmed

Registration confirmation status.

broadcastTransport

protected BroadcastTransport broadcastTransport

Broadcast transport needed for channel searches.

connector

protected CAConnector connector

CA connector (creates CA virtual circuit).

transportRegistry

protected CATransportRegistry transportRegistry

CA transport (virtual circuit) registry. This registry contains all active transports - connections to CA servers.

cachedBufferAllocator

protected CachedByteBufferAllocator cachedBufferAllocator

Cached byte buffer allocator. Used by transports which as send buffers.

channelsByCID

protected IntHashMap channelsByCID

Map of channels (keys are CIDs).

channelsByName

protected Map channelsByName

Map of channels (keys are names).

pendingResponseRequests

protected IntHashMap pendingResponseRequests

Map of pending response requests (keys are IOID).

beaconHandlers

protected Map beaconHandlers

Beacon handler map.

Constructor Detail

CAJContext

public CAJContext()

Constructor.

Method Detail

getVersion

public gov.aps.jca.Version getVersion()

Get context version.

Specified by:

getVersion in class gov.aps.jca.Context

See Also:

Context.getVersion()

initializeLogger

protected void initializeLogger()

Initialize context logger.

loadConfiguration

protected void loadConfiguration()

Load configuration.

configure

public void configure(gov.aps.jca.configuration.Configuration configuration)
               throws gov.aps.jca.configuration.ConfigurationException

Specified by:

configure in interface gov.aps.jca.configuration.Configurable

Throws:

gov.aps.jca.configuration.ConfigurationException

See Also:

Configurable.configure(gov.aps.jca.configuration.Configuration)

getContextMessageListeners

public gov.aps.jca.event.ContextMessageListener[] getContextMessageListeners()
                                                                      throws IllegalStateException

Specified by:

getContextMessageListeners in class gov.aps.jca.Context

Throws:

IllegalStateException

See Also:

Context.getContextMessageListeners()

addContextMessageListener

public void addContextMessageListener(gov.aps.jca.event.ContextMessageListener l)
                               throws gov.aps.jca.CAException,
                                      IllegalStateException

Specified by:

addContextMessageListener in class gov.aps.jca.Context

Throws:

gov.aps.jca.CAException

IllegalStateException

See Also:

Context.addContextMessageListener(gov.aps.jca.event.ContextMessageListener)

removeContextMessageListener

public void removeContextMessageListener(gov.aps.jca.event.ContextMessageListener l)
                                  throws gov.aps.jca.CAException,
                                         IllegalStateException

Specified by:

removeContextMessageListener in class gov.aps.jca.Context

Throws:

gov.aps.jca.CAException

IllegalStateException

See Also:

Context.removeContextMessageListener(gov.aps.jca.event.ContextMessageListener)

getContextExceptionListeners

public gov.aps.jca.event.ContextExceptionListener[] getContextExceptionListeners()
                                                                          throws IllegalStateException

Specified by:

getContextExceptionListeners in class gov.aps.jca.Context

Throws:

IllegalStateException

See Also:

Context.getContextExceptionListeners()

addContextExceptionListener

public void addContextExceptionListener(gov.aps.jca.event.ContextExceptionListener l)
                                 throws gov.aps.jca.CAException,
                                        IllegalStateException

Specified by:

addContextExceptionListener in class gov.aps.jca.Context

Throws:

gov.aps.jca.CAException

IllegalStateException

See Also:

Context.addContextExceptionListener(gov.aps.jca.event.ContextExceptionListener)

removeContextExceptionListener

public void removeContextExceptionListener(gov.aps.jca.event.ContextExceptionListener l)
                                    throws gov.aps.jca.CAException,
                                           IllegalStateException

Specified by:

removeContextExceptionListener in class gov.aps.jca.Context

Throws:

gov.aps.jca.CAException

IllegalStateException

See Also:

Context.removeContextExceptionListener(gov.aps.jca.event.ContextExceptionListener)

notifyException

public void notifyException(gov.aps.jca.event.ContextExceptionEvent event)

Notifies context listeners about exception.

Parameters:

event - context exception event to be fired.

checkState

protected void checkState()
                   throws gov.aps.jca.CAException,
                          IllegalStateException

Check context state and tries to establish necessary state.

Throws:

gov.aps.jca.CAException

IllegalStateException

initialize

public void initialize()
                throws gov.aps.jca.CAException

Overrides:

initialize in class gov.aps.jca.Context

Throws:

gov.aps.jca.CAException

See Also:

Context.initialize()

destroy

public void destroy()
             throws gov.aps.jca.CAException,
                    IllegalStateException

Specified by:

destroy in class gov.aps.jca.Context

Throws:

gov.aps.jca.CAException

IllegalStateException

See Also:

Context.destroy()

createChannel

public gov.aps.jca.Channel createChannel(String name,
                                gov.aps.jca.event.ConnectionListener l,
                                short priority)
                                  throws gov.aps.jca.CAException,
                                         IllegalStateException

Specified by:

createChannel in class gov.aps.jca.Context

Throws:

gov.aps.jca.CAException

IllegalStateException

See Also:

Context.createChannel(java.lang.String, gov.aps.jca.event.ConnectionListener, short)

destroyChannel

public void destroyChannel(CAJChannel channel,
                  boolean force)
                    throws gov.aps.jca.CAException,
                           IllegalStateException

Destroy channel.

Parameters:

channel -

force -

Throws:

gov.aps.jca.CAException

IllegalStateException

getChannel

public CAJChannel getChannel(int channelID)

Searches for a channel with given channel ID.

Parameters:

channelID - CID.

Returns:

channel with given CID, null if non-existant.

getChannel

public CAJChannel getChannel(String name,
                    short priority,
                    boolean acquire)

Searches for a channel with given channel name.

Parameters:

name - channel name.

priority - channel priority.

acquire - whether to acquire ownership (increment ref. counting)

Returns:

channel with given name, null if non-existant.

getChannels

public gov.aps.jca.Channel[] getChannels()

Specified by:

getChannels in class gov.aps.jca.Context

See Also:

Context.getChannels()

pendIO

public void pendIO(double timeout)
            throws gov.aps.jca.TimeoutException,
                   gov.aps.jca.CAException,
                   IllegalStateException

Specified by:

pendIO in class gov.aps.jca.Context

Throws:

gov.aps.jca.TimeoutException

gov.aps.jca.CAException

IllegalStateException

See Also:

Context.pendIO(double)

testIO

public boolean testIO()
               throws gov.aps.jca.CAException,
                      IllegalStateException

Specified by:

testIO in class gov.aps.jca.Context

Throws:

gov.aps.jca.CAException

IllegalStateException

See Also:

Context.testIO()

pendEvent

public void pendEvent(double timeout)
               throws gov.aps.jca.CAException,
                      IllegalStateException

Specified by:

pendEvent in class gov.aps.jca.Context

Throws:

gov.aps.jca.CAException

IllegalStateException

See Also:

Context.pendEvent(double)

poll

public void poll()
          throws gov.aps.jca.CAException,
                 IllegalStateException

Specified by:

poll in class gov.aps.jca.Context

Throws:

gov.aps.jca.CAException

IllegalStateException

See Also:

Context.poll()

flushIO

public void flushIO()
             throws gov.aps.jca.CAException,
                    IllegalStateException

Specified by:

flushIO in class gov.aps.jca.Context

Throws:

gov.aps.jca.CAException

IllegalStateException

See Also:

Context.flushIO()

attachCurrentThread

public void attachCurrentThread()
                         throws gov.aps.jca.CAException,
                                IllegalStateException

Specified by:

attachCurrentThread in class gov.aps.jca.Context

Throws:

gov.aps.jca.CAException

IllegalStateException

See Also:

Context.attachCurrentThread()

printInfo

public void printInfo(PrintStream out)
               throws IllegalStateException

Overrides:

printInfo in class gov.aps.jca.Context

Throws:

IllegalStateException

See Also:

Context.printInfo(java.io.PrintStream)

isInitialized

public boolean isInitialized()

Get initialization status.

Returns:

initialization status.

isDestroyed

public boolean isDestroyed()

Get destruction status.

Returns:

destruction status.

getAddressList

public String getAddressList()

Get search address list.

Returns:

get search address list.

isAutoAddressList

public boolean isAutoAddressList()

Get auto search-list flag.

Returns:

auto search-list flag.

getBeaconPeriod

public float getBeaconPeriod()

Get beacon period (in seconds).

Returns:

beacon period (in seconds).

getConnectionTimeout

public float getConnectionTimeout()

Get connection timeout (in seconds).

Returns:

connection timeout (in seconds).

getLogger

public Logger getLogger()

Get logger.

Specified by:

getLogger in interface LoggerProvider

Returns:

logger.

getMaxArrayBytes

public int getMaxArrayBytes()

Get max size of payload.

Returns:

max size of payload.

getRepeaterPort

public int getRepeaterPort()

Get repeater port.

Returns:

repeater port.

getServerPort

public int getServerPort()

Get server port.

Specified by:

getServerPort in interface CAContext

Returns:

server port.

getBroadcastPort

public int getBroadcastPort()

Get broadcast port.

Specified by:

getBroadcastPort in interface CAContext

Returns:

broadcast port.

getEventDispatcher

public final gov.aps.jca.event.EventDispatcher getEventDispatcher()

Get event dispatcher.

Returns:

event dispatcher.

getReactor

public Reactor getReactor()

Get context reactor.

Specified by:

getReactor in interface CAContext

Returns:

context reactor.

getBroadcastTransport

public BroadcastTransport getBroadcastTransport()

Broadcast transport.

Specified by:

getBroadcastTransport in interface CAContext

Returns:

broadcast transport.

getTransportRegistry

public CATransportRegistry getTransportRegistry()

Get CA transport (virtual circuit) registry.

Specified by:

getTransportRegistry in interface CAContext

Returns:

CA transport (virtual circuit) registry.

getTimer

public Timer getTimer()

Get timer.

Specified by:

getTimer in interface CAContext

Returns:

timer.

getChannelSearchManager

public ChannelSearchManager getChannelSearchManager()

Get channel search manager.

Returns:

channel search manager.

getCachedBufferAllocator

public CachedByteBufferAllocator getCachedBufferAllocator()

Get cached byte allocator.

Specified by:

getCachedBufferAllocator in interface CAContext

Returns:

cached byte allocator.

getLeaderFollowersThreadPool

public LeaderFollowersThreadPool getLeaderFollowersThreadPool()

Get LF thread pool.

Specified by:

getLeaderFollowersThreadPool in interface CAContext

Returns:

LF thread pool, can be null if disabled.

isRegistrationConfirmed

public boolean isRegistrationConfirmed()

Get repeater registration status.

Returns:

repeater registration status.

repeaterConfirm

public void repeaterConfirm(InetSocketAddress responseFrom)

Repeater registration confirmation.

Parameters:

responseFrom - response from address.

beaconAnomalyNotify

public void beaconAnomalyNotify()

Called each time beacon anomaly is detected.

searchResponse

public void searchResponse(int cid,
                  int sid,
                  short type,
                  int count,
                  short minorRevision,
                  InetSocketAddress serverAddress)

Search response from server (channel found).

Parameters:

cid - client channel ID.

sid - server channel ID.

type - channel type code.

count - channel element count.

minorRevision - server minor CA revision.

serverAddress - server address.

getResponseRequest

public ResponseRequest getResponseRequest(int ioid)

Searches for a response request with given channel IOID.

Parameters:

ioid - I/O ID.

Returns:

request response with given I/O ID.

registerResponseRequest

public int registerResponseRequest(ResponseRequest request)

Register response request.

Parameters:

request - request to register.

Returns:

request ID (IOID).

unregisterResponseRequest

public ResponseRequest unregisterResponseRequest(ResponseRequest request)

Unregister response request.

Parameters:

request -

Returns:

removed object, can be null

incrementPendingRequests

public int incrementPendingRequests()

Increment pending requests counter.

Returns:

IO sequence number (pendIO sequence number).

decrementPendingRequests

public void decrementPendingRequests(int usedSequenceNumberIO)

Decrement pending requests counter.

Parameters:

usedSequenceNumberIO - IO sequence number returned by incrementPendingRequests

setLastReceivedSequenceNumber

public final void setLastReceivedSequenceNumber(int seqNo)

Set last UDP recived sequence number.

Parameters:

seqNo - last UDP recived sequence number.

getLastReceivedSequenceNumber

public final int getLastReceivedSequenceNumber(int seqNo)

Set last UDP recived sequence number.

Parameters:

seqNo - last UDP recived sequence number.

invalidateLastReceivedSequence

public final void invalidateLastReceivedSequence()

Description copied from interface: CAContext

Invalidate last (UDP) received sequence.

Specified by:

invalidateLastReceivedSequence in interface CAContext

See Also:

CAContext.invalidateLastReceivedSequence()

getBeaconHandler

public CABeaconHandler getBeaconHandler(InetSocketAddress responseFrom)

Get (and if necessary create) beacon handler.

Parameters:

responseFrom - remote source address of received beacon.

Returns:

beacon handler for particular server.