IS-Registry

Role

The IS-Registry is the gateway to entering in a gCube infrastructure for gCube resources by means of registering/unregistering their profiles.

The IS-Registry performs three fundamental tasks:

• decide if accept or not a new resource
• validate a resource before its registration
• execute post-deletion actions to keep consistent the IS content

Design

The design of the service is distributed across two port-types: the ResourceRegistration and the Factory. Both of them work in a stateless manner, however the Factory creates a stateful resource for notification purposes.

Figure 1. IS-Registry Architecture

ResourceRegistration

Figure 2. IS-Registry ResourceRegistration port-type

The ResourceRegistration port-type manages the registration/update/removal of GCUBE Resources. It is directly contacted only by the IS-Publisher in order to perform such operations.

It exposes three operations:

• create – which takes as input a CreateMessage containing the string serialization of the resource profile to register;
• update – which takes as input an UpdateMessage containing the new profile that will replace an existing one;
• remove – which takes as input a RemoveMessage containing the unique identifier of the resource to be removed and its type;

The first two operations throw an InvalidResourceFault if the profile was not correct/valid and a ResourceNotAcceptedFault if the profile was not accepted because of the instance's configured filters.

Factory

Figure 3. IS-Registry Factory port-type

From the functional point of view, the Factory port-type is practically a wrapper around the ResourceRegistration port-type to provide backwards compatibility to previous IS-Publisher and testers implementation. Therefore, it exposes the following operations:

• createResource
• updateResource
• removeResource

that are mapped on the ResourceRegistration's operations. Using this port-type is strongly deprecated and it will likely disappear in the next releases of the service.

FactoryResource

At start up time, the Factory port-type is in charge of creating the singleton FactoryResource. This resource (whose name is derived from previous versions of the service) exposes a set of WS-ResourceProperties registered as Topics in the IS-Notifier, making possible for interested clients to subscribe on events representing the changes of status of Infrastructure constituents (e.g. the disappearance of a Running Instance).

Figure 4. IS-Registry FactoryResource

This is the list of RPs exposed:

<xsd:element name="RegistryFactoryResourceProperties">
        <xsd:complexType>
               <xsd:sequence>                          
                      <xsd:element ref="tns:RunningInstance" minOccurs="1" maxOccurs="1"/>
                      <xsd:element ref="tns:ExternalRunningInstance" minOccurs="1" maxOccurs="1"/>
                      <xsd:element ref="tns:Service" minOccurs="1" maxOccurs="1"/>
                      <xsd:element ref="tns:Collection" minOccurs="1" maxOccurs="1"/>
                      <xsd:element ref="tns:GHN" minOccurs="1" maxOccurs="1"/>
                      <xsd:element ref="tns:MetadataCollection" minOccurs="1" maxOccurs="1"/>
                      <xsd:element ref="tns:GenericResource" minOccurs="1" maxOccurs="1"/>
              </xsd:sequence>
        </xsd:complexType>
</xsd:element>

and each element of the sequence is of type ResourceProperty defined as follows:

<xsd:complexType name="RegistryProperty">	
	<xsd:sequence>
		<xsd:element name="uniqueID" type="xsd:string" nillable="true"/>
		<xsd:element name="profile" type="xsd:string" nillable="true"/>  
		<xsd:element name="operationType" type="xsd:string" nillable="true"/> 
	  	<xsd:element name="changeTime" type="xsd:dateTime" nillable="true"/> 
	</xsd:sequence>
</xsd:complexType>

Note that:

• uniqueID is the identifier of the resource
• profile is the string serialization of the resource's profile
• operationType is the type of operation performed on the resource (allowed values are: create, update, destroy)
• changeTime is the time stamp of the operation

Sample Usage

This section provides sample usage of the ResourceRegistration port-type. The Factory port-type is obsolete and should not be used anymore.

Note that:

• due to the behavior of the IS-Publisher, any request is executed asynchronously (at the next scheduled bulk execution)
• if the operation is performed inside a service, the ServiceContext has to be used as GCUBESecurityManager (instead of the ad hoc manager created here below).

Registering a new GCUBE Resource

The following test method show how to register a new GCUBE Resource:

import org.gcube.informationsystem.registry.stubs.resourceregistration.CreateMessage;
import org.gcube.informationsystem.registry.stubs.resourceregistration.ResourceRegistrationPortType;
import org.gcube.informationsystem.registry.stubs.resourceregistration.service.ResourceRegistrationServiceAddressingLocator;
 
//...
 
protected void registerResource(GCUBEResource resource, GCUBEScope scope) throws Exception {
	int timeout = 20000;
	StringWriter profile = new StringWriter();
	resource.store(profile);
	GCUBESecurityManagerImpl manager = new GCUBESecurityManagerImpl() {
		public boolean isSecurityEnabled() { return false;}
	};
	ResourceRegistrationServiceAddressingLocator locator = new ResourceRegistrationServiceAddressingLocator(); 			
	ResourceRegistrationPortType registration = locator.getResourceRegistrationPortTypePort(epr);
	registration = GCUBERemotePortTypeContext.getProxy(registration, scope, timeout, manager);
	try {
		CreateMessage message = new CreateMessage();
		message.setProfile(profile.toString());
		message.setType(resource.getType());
		registration.create(message);
	} catch(Exception e) { 				
		logger.error("Failed to publish the GCUBE Resource ",e);										
	}
}

Updating an existing GCUBE Resource

The following test method show how to update an existing GCUBE Resource:

import org.gcube.informationsystem.registry.stubs.resourceregistration.UpdateMessage;
import org.gcube.informationsystem.registry.stubs.resourceregistration.ResourceRegistrationPortType;
import org.gcube.informationsystem.registry.stubs.resourceregistration.service.ResourceRegistrationServiceAddressingLocator;
 
//...
 
protected void updateResource(GCUBEResource resource, GCUBEScope scope) throws Exception {
	int timeout = 20000;
	StringWriter profile = new StringWriter();
	resource.store(profile);
	GCUBESecurityManagerImpl manager = new GCUBESecurityManagerImpl() {
		public boolean isSecurityEnabled() { return false;}
	};
	ResourceRegistrationServiceAddressingLocator locator = new ResourceRegistrationServiceAddressingLocator(); 			
	ResourceRegistrationPortType registration = locator.getResourceRegistrationPortTypePort(epr);
	registration = GCUBERemotePortTypeContext.getProxy(registration, scope, timeout, manager);
	try {
		UpdateMessage message = new UpdateMessage();
		message.setUniqueID(profile.getID());
		message.setXmlProfile(profile.toString());
		message.setType(resource.getType());
		registration.update(message);
	} catch(Exception e) { 				
		logger.error("Failed to update the GCUBE Resource ",e);										
	}
}

Removing a GCUBE resource

The following test method show how to remove a GCUBE Resource:

import org.gcube.informationsystem.registry.stubs.resourceregistration.RemoveMessage;
import org.gcube.informationsystem.registry.stubs.resourceregistration.ResourceRegistrationPortType;
import org.gcube.informationsystem.registry.stubs.resourceregistration.service.ResourceRegistrationServiceAddressingLocator;
 
//...
 
protected void unregisterResource(GCUBEResource resource, GCUBEScope scope) throws Exception {
	int timeout = 20000;
	GCUBESecurityManagerImpl manager = new GCUBESecurityManagerImpl() {
		public boolean isSecurityEnabled() { return false;}
	};
	ResourceRegistrationServiceAddressingLocator locator = new ResourceRegistrationServiceAddressingLocator(); 			
	ResourceRegistrationPortType registration = locator.getResourceRegistrationPortTypePort(epr);
	registration = GCUBERemotePortTypeContext.getProxy(registration, scope, timeout, manager);
	try {
		RemoveMessage message = new RemoveMessage();
		message.setUniqueID(this.getResourceID());
		message.setType(resource.getType());
		registration.remove(message);
	} catch(Exception e) { 				
		logger.error("Failed to remove the GCUBE Resource ",e);										
	}
}