org.objectweb.carol.cmi

Class DistributorSlsbRemote

java.lang.Object

org.objectweb.carol.cmi.Distributor

org.objectweb.carol.cmi.DistributorSlsbRemote

public abstract class DistributorSlsbRemote
extends Distributor

Specific Distributor class for the Home interface load balancing and fail-over logic - default LB algorithm : -> local pref and round robin - default fail-over algorithm : -> retry on ConnectException or ConnectIOException or NoSuchObjectException

Author:

Benoit Pelletier

Constructor Summary

Constructors

Constructor and Description
DistributorSlsbRemote()

Method Summary

Methods

Modifier and Type	Method and Description
StubData	choose(java.lang.reflect.Method method, java.lang.Object[] parameters) choose a stub according to the load balancing algorithm - round robin Note that here the local preference is not implemented because not necessary.
boolean	equivAtBind() To be overriden
boolean	equivAtExport() To be overriden
Decision	onException(java.lang.reflect.Method method, java.lang.Object[] parameters, StubData sd, java.lang.Exception ex) Decision on Exception : - retry on ConnectException or ConnectIOException or NoSuchObjectException The application deployer can override this method to make its own choices.
Decision	onReturn(java.lang.reflect.Method method, java.lang.Object[] parameters, StubData sd, java.lang.Object retVal) Decision on return - do nothing The application deployer can override this method to make its own choices.

Methods inherited from class org.objectweb.carol.cmi.Distributor

chooseLocalFirst, getCurrentState, getMyServerId, getStubList, preInvoke, read, removeStub, removeStub, toContentsString, toString, write

Methods inherited from class java.lang.Object

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

Constructor Detail

DistributorSlsbRemote

public DistributorSlsbRemote()

Method Detail

equivAtBind

public boolean equivAtBind()

Description copied from class: Distributor

To be overriden

Specified by:

equivAtBind in class Distributor

Returns:

true if the bound object have to be clustered

See Also:

Distributor.equivAtBind()

equivAtExport

public boolean equivAtExport()

Description copied from class: Distributor

To be overriden

Specified by:

equivAtExport in class Distributor

Returns:

true if the export object have to be clustered

See Also:

The single remote stub for the SSB has to be replicated at the export() time

choose

public StubData choose(java.lang.reflect.Method method,
              java.lang.Object[] parameters)
                throws NoServerException

choose a stub according to the load balancing algorithm - round robin Note that here the local preference is not implemented because not necessary. Indeed, the onReturn() method of the DistributorHome class for a create() returns a single stub (not a CMI stub but a simple RMI stub) when a local one exists. Thus for the SSB remote interface the CMI stub is used and this choose() method is called only if there is not local target. The application can override this method

Overrides:

choose in class Distributor

Parameters:

method - called method

parameters - method's parameters list

Returns:

chose stub

Throws:

NoServerException - if no more stub available

onReturn

public Decision onReturn(java.lang.reflect.Method method,
                java.lang.Object[] parameters,
                StubData sd,
                java.lang.Object retVal)

Decision on return - do nothing The application deployer can override this method to make its own choices.

Overrides:

onReturn in class Distributor

Parameters:

method - calling method

parameters - parameters of the calling method

sd - stub data

retVal - return value

Returns:

decision

onException

public Decision onException(java.lang.reflect.Method method,
                   java.lang.Object[] parameters,
                   StubData sd,
                   java.lang.Exception ex)

Decision on Exception : - retry on ConnectException or ConnectIOException or NoSuchObjectException The application deployer can override this method to make its own choices.

Overrides:

onException in class Distributor

Parameters:

method - calling method

parameters - parameters of the calling method

sd - stub data

ex - exception

Returns:

decision