OGSA-DAI
Grid Data Service Factory
EPCC, University of Edinburgh
Mike Jackson,
michaelj@epcc.ed.ac.uk
OGSA-DAI Training Workshop – April 2003
Release: P2R2
Talk Outline
Grid Data Service Factory
4Release 2:
– Capabilities.
– Java API.
4Release 3:
– Planned Capabilities.
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OGSA-DAI Training Workshop, Release: P2R2
Grid Data Service Factory
4Implements OGSA PortTypes:
– GridService
– Factory
– NotificationSource
4Provides services for:
– Creating new Grid Data Services for pre-defined data resources.
– Querying of service data:
• Pre-defined data resources for which the GDSF can create GDSs.
• Information relating to these data resources – schemes, locations,
paths, resources.
– Subscribing to changes in the GDSF state.
4Is a persistent Grid service.
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Initialisation
4Configuration documents specify:
– Available data resources:
•
•
•
•
•
Schemes
Locations
Resources
Paths
Activities
– Activity Maps.
– Data Resource Implementations.
– Registration List.
4On creation, the GDSF registers with specified
Grid Data Service Registries.
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OGSA-DAI Training Workshop, Release: P2R2
Initialisation + Deployment
<service name="ogsadai/GridDataServiceFactoryP2R2" provider="Handler"
style="wrapped">
<parameter name="ogsadai.gdsf.config.xml.file"
value="OGSADAI.PROPERTIES.DIR/GDSFConfig.xml"/>
<parameter name="ogsadai.gdsf.registrations.xml.file"
value="OGSADAI.PROPERTIES.DIR/registrationList.xml"/>
<parameter name="ogsadai.gdsf.activities.xml.file"
value="OGSADAI.PROPERTIES.DIR/activityMap.xml"/>
<parameter name="ogsadai.gdsf.dataresource.impl.map.xml.file"
value="OGSADAI.PROPERTIES.DIR/dataResourceImplementationMap.xml"/>
<parameter name="allowedMethods" value="*"/>
<parameter name="className"
value="uk.org.ogsadai.service.gdsf.GridDataServiceFactoryP2R2"/>
<parameter name="persistent" value="true"/>
<parameter name="activateOnStartup" value="true"/>
<parameter name="schemaPath" value="schema/ogsadai/gdsf/gdsf_service.wsdl"/>
<parameter name="instanceSchemaPath"
value="schema/ogsadai/gds/grid_data_service.wsdl"/>
<parameter name="handlerClass"
value="org.globus.ogsa.handlers.RPCURIProvider"/>
</service>
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OGSA-DAI Training Workshop, Release: P2R2
Accessing a GDSF
4
Interface and implementing class:
uk.org.ogsadai.client.gdsf.GridDataServiceFactory
uk.org.ogsadai.client.gdsf.GridDataServiceFactoryLocator
4
Methods:
GridServicePortType
getGridServicePort(URL url)
FactoryPortType
getFactoryPort(URL url)
NotificationSourcePortType getNotificationSourcePort(URL url)
–
Where:
•
•
•
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url is the GSH of a GDSR.
Return objects all belong to org.gridforum.ogsa.
All methods throw javax.xml.rpc.ServiceException.
OGSA-DAI Training Workshop, Release: P2R2
Creating a GDS – CreateService Documents
<?xml version="1.0" encoding="UTF-8"?>
<gdsf:gridDataServiceFactoryCreate
xmlns:gds="http://ogsadai.org.uk/P2R2/schemas/gds"
xmlns:gdsf="http://ogsadai.org.uk/P2R2/schemas/gdsf"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://ogsadai.org.uk/P2R2/schemas/gdsf
../../src/wsdlR2/types/grid_data_service_factory_types.xsd
http://ogsadai.org.uk/P2R2/schemas/gds
grid_data_service_types.xsd ">
<gdsf:dataResourceName>
myDataResource
</gdsf:dataResourceName>
</gdsf:gridDataServiceFactoryCreate>
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Creating a GDS – Eliciting Information
4Query available data resources for which the GDSF
can provide GDSs.
4Use GridService::FindServiceData:
<gsdl:QueryByServiceDataName xmlns:gsdl=
‘‘http://www.gridforum.org/namespaces/2002/10/gridServices’’>
<serviceDataName name=
‘‘{http://ogsadai.org.uk/schemas/gdsf/definitions}DataResources’’/>
</gsdl:QueryByServiceDataName>
4 Namespace: {http://ogsadai.org.uk/schemas/gdsf/definitions}
4 Local parts:
–
–
–
–
8
Schemes
Locations
Resources
DataResources
OGSA-DAI Training Workshop, Release: P2R2
DataResources Service Data
<ns1:serviceData xsi:type="ns1:ServiceDataType" ns1:availableUntil="200304-22T08:40:54.330Z" ns1:goodFrom="2003-04-21T08:40:54.330Z"
ns1:goodUntil="2003-04-22T08:40:54.330Z" ns1:name="ns2:DataResources"
xmlns:ns2="http://ogsadai.org.uk/schemas/gdsf/definitions"
xmlns:ns1="http://www.gridforum.org/namespaces/2002/10/gridServices"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
<ns3:dataResource xsi:type="ns3:DataResourceType“
name="myXMLDBDataResource”
xmlns:ns3="http://ogsadai.org.uk/P2R2/schemas/gdsf">
<ns3:scheme-ref>xindice</ns3:scheme-ref>
<ns3:path-ref>myXMLDB</ns3:path-ref>
<ns3:location-ref>myXMLDBMS</ns3:location-ref>
</ns3:dataResource>
<ns4:dataResource xsi:type="ns4:DataResourceType"
name="myDataResource"
xmlns:ns4="http://ogsadai.org.uk/P2R2/schemas/gdsf">
<ns4:scheme-ref>mysql1</ns4:scheme-ref>
<ns4:path-ref>myDB</ns4:path-ref>
<ns4:location-ref>myJDBCDBMS</ns4:location-ref>
</ns4:dataResource>
</ns1:serviceData>
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OGSA-DAI Training Workshop, Release: P2R2
Factory::CreateService
4 Method of interface org.gridforum.ogsa.FactoryPortType
ServiceTerminationReferenceType
createService(CreationType creation)
throws java.rmi.RemoteException,
org.gridforum.ogsa.ServiceAlreadyExistsFault
4 Where:
– creation holds:
• CreateService Document specifying the data resource to which new new
GDS should manage access.
• Requested termination time of the new GDS (optional).
– ServiceTerminationReferenceType belongs to
org.gridforum.ogsa and holds:
• GSH of the new GDS.
• Termination time of the new GDS.
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Future Capabilities
4 Revising GDSF service data:
– Exposing activities corresponding to data resources.
– Exposing information about activities themselves.
– Exposing dynamic information about a data resource:
• Database tables or XML Schema.
• Database memory usage and availability.
• Database load.
4 Registering newly-created GDSs with GDSRs.
4 Allowing clients to define new data resources based on
the GDSF configuration:
– Updating GDSF configuration documents for reuse.
4 Client authorisation:
– Restrict abilities of clients to create services.
4 Transient GDSFs.
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OGSA-DAI Training Workshop, Release: P2R2