Difference between revisions of "IS-Notification"

Revision as of 15:57, 9 September 2010

Design

The IS-Notification is a library that provides a subscription/notification mechanism based on Remote Events. This library helps the clients to interact with the Notifier Service and allows:

• for a Client or a Service (Subscriber) to subscribe for a Topic and receiving notifications
• for a Service (producer) to register its own topic and sending notification.

Interface

• public <T extends BaseNotificationConsumer> void registerToISNotification(T consumer,List<GCUBENotificationTopic> notifications, GCUBESecurityManager manager, GCUBEScope ... scope) throws ISNotifierException – this method registers a entity of type T (consumer) for a list of GCUBENotificationTopic in selected Scopes (scope) with a GCUBESecurityManager (manager) in the IS-Notifier;
• public void unregisterFromISNotification( GCUBESecurityManager manager, List<GCUBENotificationTopic> notifications, GCUBEScope ... scope) throws ISNotifierException – this method unregisters the consumer for a list of GCUBENotificationTopic from the IS-Notifier in the selected scopes (scope) with a GCUBESecurityManager (manager);
• public void registerISNotification (EndpointReferenceType producerEPR, List<? extends Topic> notifications, GCUBESecurityManager manager, GCUBEScope ... scope) throws ISNotifierException – this method registers the reference to a resource (producerEPR) that produces a list of topics (notifications) in the IS-Notifier in the selected scopes (scope) with a GCUBESecurityManager (manager);
• public void unregisterISNotification (EndpointReferenceType producerEPR, List<? extends Topic> notifications, GCUBESecurityManager manager, GCUBEScope ... scope) throws ISNotifierException – this method unregister the reference to a resource (producerEPR) for a list of topics (notifications) in the IS-Notifier in the selected scopes (scope) with a GCUBESecurityManager (manager);
• public boolean[] isTopicRegistered(GCUBESecurityManager securityManager, GCUBEScope scope, List<TopicData> topics) throws ISNotifierException - this methods checks if a topic (topic) registration is completed or not for a producer (producerEpr) in the IS-Notifier in the selected scopes (scope) with a GCUBESecurityManager (manager);

New Features

From version 1.4 this library contains new features:

• the possibility to register for a client running outside a gcore container;
• the possibility to register to a Topic specifying a 'precodition'. The 'precodition' is represented by an XPath specified at Topic creation time an evaluated producer-side. This feature reduces the number of messages exchanged between producer and consumer.

How to configure clients running outside the gCore container

To register a Topic outside a gCore cotnainer this library requires 2 steps of configuration:

• modify the file $GLOBUS_LOCATION/etc/globus_wsrf_core/client-server-config.wsdd adding in the globalConfiguration session the parameter hostname

     ...
<globalConfiguration>
        <parameter name="containerThreads" value="1"/>
        <parameter name="containerThreadsMax" value="3"/>
        <parameter name="hostname" value="yourhost"/> 
        <parameter name="sendXsiTypes" value="true"/>
 
        <!-- Authentication service -->
        <parameter name="authenticationService"
                value="gsi/AuthenticationService"/>
     ...

Examples