Activity - demoQueryInstance

Activity Type: Example

Description

A demo activity that queries a data service resource that was dynamically created by one of the demo instance creation activities.

For more details regarding the creation of data service resources see the How to Write an Activity that Creates Persisted Data Service Resources and How to Write an Activity that Creates Transient Data Service Resources tutorials.

Example

<demoQueryInstance name="query">
  <myOutput name="queryOutput"/>
</demoQueryInstance>

Specification

Element demoQueryInstance:

• Attribute name - unique name for the activity within the scope of a request.
• output (required)
  • Attribute name - name of the activity's output stream.

Input and Output Types

• Output: myOutput — a single block of type java.lang.String that contains the name value stored in the corresponding data resource accessor.

Data Resource Accessor

This activity requires a data resource accessor that implements the following interface: uk.org.ogsadai.examples.demoFactory.DemoNameProvider

XML Schema

OGSA-DAI/schema/ogsadai/xsd/activities/demo_query_instance.xsd

Class

uk.org.ogsadai.examples.demoFactory.DemoQueryInstanceActivity

Client Toolkit Class

None at present.