Activity - demoCreateInstance

Activity Type: Example

Description

A demo activity that creates a data service resource. The configuration relating to this new resource will be written to file thereby persiting the resource so it will survive container restarts.

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 Persisted Data Service Resources tutorial.

Example

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

Specification

Element demoCreateInstance:

• 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.service.resource.factory.ConfigDirectoryProvider

XML Schema

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

Class

uk.org.ogsadai.examples.demoFactory.DemoCreateInstanceActivity

Client Toolkit Class

None at present.