uk.org.ogsadai.examples.demoFactory
Class DemoCreateInstanceActivity

java.lang.Object
  |
  +--uk.org.ogsadai.activity.Activity
        |
        +--uk.org.ogsadai.examples.demoFactory.DemoCreateInstanceActivity

public class DemoCreateInstanceActivity

extends Activity

An activity that creates a new data service resource to demonstrate the data service resource creation functionality.

For information on this activity see the OGSA-DAI user doc: OGSA-DAI/doc/interaction/activities/examples/demoCreateInstance.html

Author:

OGSA-DAI team

Field Summary

private static java.lang.String	COPYRIGHT_NOTICE Copyright statement
private static java.lang.String	INSTANCE_CLASS_NAME Name of the data resource instance class
private java.lang.String	mName The name to be returned by activities that access the created data resource.
private BlockWriter	mOutput Activity output.

Fields inherited from class uk.org.ogsadai.activity.Activity

mContext, mExternalInputs, mExternalOutputs, mInternalInputs, mInternalOutputs

Constructor Summary

DemoCreateInstanceActivity(org.w3c.dom.Element element)
Constructs a demo create instance activity using the specified XML element.

Method Summary

void	initialise() This method should be overridden by subclasses to perform any initialisation they require before the process method invocations begin.
void	processBlock() Performs an iteration of the processing of an activity.

Methods inherited from class uk.org.ogsadai.activity.Activity

cleanUp, connectsTo, createOutputPipe, getActivityConfiguration, getActivityName, getCause, getName, getObservableStatus, getProperties, getSession, getStatus, hasActivityConfiguration, hasProperties, process, processFirst, setActivityName, setCompleted, setError

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

COPYRIGHT_NOTICE

private static final java.lang.String COPYRIGHT_NOTICE

Copyright statement

See Also:

Constant Field Values

INSTANCE_CLASS_NAME

private static final java.lang.String INSTANCE_CLASS_NAME

Name of the data resource instance class

See Also:

Constant Field Values

mOutput

private BlockWriter mOutput

Activity output.

mName

private java.lang.String mName

The name to be returned by activities that access the created data resource.

Constructor Detail

DemoCreateInstanceActivity

public DemoCreateInstanceActivity(org.w3c.dom.Element element)
                           throws ActivitySpecificationException,
                                  ActivityCreationException

Constructs a demo create instance activity using the specified XML element.

Parameters:

element - Element to configure the activity with - from a perform document.

Throws:

ActivityCreationException - If there is a problem constructing the activity due to an implementation error or OGSA-DAI confguration problem.

ActivitySpecificationException - If there is a problem constructing the activity due to an invalid setting in element. mistake such as an invalid setting.

Method Detail

initialise

public void initialise()
                throws ActivitySpecificationException,
                       ActivityExecutionException

Description copied from class: Activity

This method should be overridden by subclasses to perform any initialisation they require before the process method invocations begin. This might be used for setting up convenient fields to reference objects contained in the context. It shouldn't be used for opening resources. That should be done in processFirst.

Overrides:

initialise in class Activity

Throws:

ActivityExecutionException - If some system problem prevents the activity from initialising.

ActivitySpecificationException - If a problem with settings provided by a client prevents the activity from initialising.

processBlock

public void processBlock()

Description copied from class: Activity

Performs an iteration of the processing of an activity. This may involve reading a block of input data and writing a block of output data, or may involve some other kind of processing. When an activity is processed by the OGSA-DAI engine, this method will be invoked repeatedly until the activity either completes or stops due to an error or termination call. An implementation of this method should invoke the setCompleted method to indicate that processing is complete, or the setError method if an error occurs that will prevent the processing from completing.

Specified by:

processBlock in class Activity