edu.uci.isr.yancees.server.dispatcher.elvin
Class OldElvinAdapter

java.lang.Object
  extended byedu.uci.isr.yancees.server.dispatcher.elvin.OldElvinAdapter
All Implemented Interfaces:
EventDispatcherAdapterInterface

public class OldElvinAdapter
extends java.lang.Object
implements EventDispatcherAdapterInterface

Implements the event dispatcher interface, bridging the communication between the yancees core and the idiosincrasies of the target event notification used, in this case, Elvin.


Field Summary
 java.lang.String ADAPTER_NAME
           
 java.lang.String BODY
           
 java.lang.String BODY_PREFIX
           
 java.lang.String HEADER
           
 java.lang.String HEADER_PREFIX
           
 java.lang.String SEPARATOR
           
 
Constructor Summary
OldElvinAdapter()
           
OldElvinAdapter(java.lang.String address)
          Constructor
 
Method Summary
 void connect()
           
 void connect(java.lang.String address)
          Connects to siena bafore any method can be used.
protected  void finalize()
           
 java.lang.String getAdapterName()
           
 void publish(EventInterface e)
          Publishes a Yancees event in the format of Elvin event.
 void resumeDispatcher(EventDispatcherListenerInterface li)
          resumes the delivery of notifications to the given subscriber n.
 void shutdownDispatcher()
          closes this Dispatcher service access point.
 void subscribe(SubscriptionInterface sub, EventDispatcherListenerInterface li)
          subscribes for sequences of events matching subscription p.
 void suspendDispatcher(EventDispatcherListenerInterface li)
          suspends the delivery of notifications to the given subscriber li.
 void unsubscribe(EventDispatcherListenerInterface li)
          cancels all the subscriptions posted by n.
 void unsubscribe(SubscriptionInterface sub, EventDispatcherListenerInterface li)
          cancels the subscriptions, posted by li, whose subscripton sub' is covered by subscripiton p.
 
Methods inherited from class java.lang.Object
clone, equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
 

Field Detail

BODY_PREFIX

public final java.lang.String BODY_PREFIX
See Also:
Constant Field Values

HEADER_PREFIX

public final java.lang.String HEADER_PREFIX
See Also:
Constant Field Values

SEPARATOR

public final java.lang.String SEPARATOR
See Also:
Constant Field Values

BODY

public final java.lang.String BODY
See Also:
Constant Field Values

HEADER

public final java.lang.String HEADER
See Also:
Constant Field Values

ADAPTER_NAME

public final java.lang.String ADAPTER_NAME
See Also:
Constant Field Values
Constructor Detail

OldElvinAdapter

public OldElvinAdapter(java.lang.String address)
Constructor


OldElvinAdapter

public OldElvinAdapter()
Method Detail

connect

public void connect()

connect

public void connect(java.lang.String address)
Connects to siena bafore any method can be used. this method is used by the architecture manager to initialize the dispatcher

Specified by:
connect in interface EventDispatcherAdapterInterface
Parameters:
address - is the address of the server.

finalize

protected void finalize()
                 throws java.lang.Throwable
Throws:
java.lang.Throwable

publish

public void publish(EventInterface e)
             throws DispatcherException
Publishes a Yancees event in the format of Elvin event. It also makes the namespace transformation to differentiate body and header events. Special attributes are added to identify yancees events from regular ones that may be used in siena

Specified by:
publish in interface EventDispatcherAdapterInterface
Throws:
DispatcherException
See Also:
Event

subscribe

public void subscribe(SubscriptionInterface sub,
                      EventDispatcherListenerInterface li)
               throws DispatcherException
subscribes for sequences of events matching subscription p.

Notice that given the distributed nature of some implementations of Dispatcher interface, there exist race conditions that might affect the semantics of subscriptions. A subscriber might miss some notifications published before or while the subscription is processed by Dispatcher.

Also, keep in mind that the current implementation of Dispatcher does not enforce any temporal order for the delivery of notifications. This limitation might affect the recognition of patterns. For example, two notifications x and y, generated at time tx and ty respectively, with tx < ty, in that order matching a pattern P=(fx fy), might in fact reach the subscriber at times Tx and Ty, with Tx > Ty, in which case pattern P would not be matched.

Specified by:
subscribe in interface EventDispatcherAdapterInterface
Parameters:
li - is the subscriber
sub - is a generic subscription containing a DOM tree. It is expected here that this subscription is in the format readable by the OldElvinAdapter.
Throws:
DispatcherException
See Also:
unsubscribe(edu.uci.isr.yancees.SubscriptionInterface, edu.uci.isr.yancees.dispatcher.EventDispatcherListenerInterface)

unsubscribe

public void unsubscribe(SubscriptionInterface sub,
                        EventDispatcherListenerInterface li)
                 throws DispatcherException
cancels the subscriptions, posted by li, whose subscripton sub' is covered by subscripiton p.

Unsubscriptions might incurr in the same kind of race conditions as subscriptions. Dispatcher will stop sending notifications to the subscriber only after it has completed the processing of the unsubscription. Due to the distributed nature of some implementations of Dispatcher, this might result in some additional ``unsolicited'' notifications.

Specified by:
unsubscribe in interface EventDispatcherAdapterInterface
Parameters:
li - is the subscriber interface
Throws:
DispatcherException
See Also:
subscribe(edu.uci.isr.yancees.SubscriptionInterface, edu.uci.isr.yancees.dispatcher.EventDispatcherListenerInterface)

unsubscribe

public void unsubscribe(EventDispatcherListenerInterface li)
                 throws DispatcherException
cancels all the subscriptions posted by n.

Specified by:
unsubscribe in interface EventDispatcherAdapterInterface
Parameters:
li - is the subscriber
Throws:
DispatcherException
See Also:
subscribe(edu.uci.isr.yancees.SubscriptionInterface, edu.uci.isr.yancees.dispatcher.EventDispatcherListenerInterface)

suspendDispatcher

public void suspendDispatcher(EventDispatcherListenerInterface li)
                       throws DispatcherException
suspends the delivery of notifications to the given subscriber li.

Specified by:
suspendDispatcher in interface EventDispatcherAdapterInterface
Parameters:
li - subscriber to be suspended
Throws:
DispatcherException

resumeDispatcher

public void resumeDispatcher(EventDispatcherListenerInterface li)
                      throws DispatcherException
resumes the delivery of notifications to the given subscriber n.

Specified by:
resumeDispatcher in interface EventDispatcherAdapterInterface
Parameters:
li - is the subscriber callback reference
Throws:
DispatcherException

shutdownDispatcher

public void shutdownDispatcher()
                        throws DispatcherException
closes this Dispatcher service access point. This method releases any system resources associated with the access point. In case this access point is connected to other Dispatcher servers, this method will properly disconnect it.

Specified by:
shutdownDispatcher in interface EventDispatcherAdapterInterface
Throws:
DispatcherException

getAdapterName

public java.lang.String getAdapterName()
Specified by:
getAdapterName in interface EventDispatcherAdapterInterface
Returns:
a name that identifies this adapter.