Activity - demoCreateTransientInstance

Activity Type: Example

Description

A demo activity that creates a data service resource. The data resource accessor for the new data service resource is held only within memory and is not written to file. This data service resource will therefore not be persisted so will not survive a container restart

The data resource accessor that is created will implement the uk.org.ogsadai.examples.demoFactory.DemoNameProvider interface and be be queried using the demoQueryInstance activity.

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

Example

<demoCreateTransientInstance name="myActivity">
  <name value="Bob"/>
  <myOutput name="outputStream"/>
</demoCreateTransientInstance>

Specification

Element demoCreateTransientInstance:

• Attribute name - unique name for the activity within the scope of a request.
• name (required)
  • Attribute value - a string that can subsequently be retrieved from the newly created resource using the queryInstance activity. This demostrates passing some state to the new instance via the creation activity.
• 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 of the newly create data service resource.

Data Resource Accessor

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

XML Schema

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

Class

uk.org.ogsadai.examples.demoTransientFactory.DemoCreateTransientInstanceActivity

Client Toolkit Class

None at present.