CallDataService (OGSA-DAI -- (c) International Business Machines Corporation, 2002-2006, The University of Edinburgh, 2002-2006)

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uk.org.ogsadai.activity.sql
Class CallDataService

java.lang.Object
  |
  +--uk.org.ogsadai.activity.Activity
        |
        +--uk.org.ogsadai.activity.sql.CallDataService

All Implemented Interfaces:: java.lang.Runnable

class CallDataService
extends Activity
implements java.lang.Runnable

This inner class contacts a data service resource exposed by a data service. A timeout is enabled which means that if this thread doesn't return result before timeout, then the main thread will go on and discard it.

Author:: The OGSA-DAI Project Team

Field Summary
`private static java.lang.String`	`COPYRIGHT_NOTICE` Copyright statement
`private static DAILogger`	`LOG` Logger object for this class
`private DataServiceInfo`	`mDataServiceInfo` Information about a data service/resource to contact
`private java.lang.String`	`mSqlStatement` SQL query statement to submit to data service/resource
`private java.lang.String`	`mWebRowSet` XML element of WebRowSet as a string

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

mContext, mExternalInputs, mExternalOutputs, mInternalInputs, mInternalOutputs

Constructor Summary
`(package private)`	`CallDataService(org.w3c.dom.Element element, DataServiceInfo dataServiceInfo, java.lang.String sqlStatement)` Constructor.

Method Summary
`(package private) java.lang.String`	`getResult()` Gets the WebRowSet containing the query results.
`protected void`	`processBlock()` Performs an iteration of the processing of an activity.
`void`	`run()`

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

cleanUp, connectsTo, createOutputPipe, getActivityConfiguration, getActivityName, getCause, getName, getObservableStatus, getProperties, getSession, getStatus, hasActivityConfiguration, hasProperties, initialise, 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

See Also:: Constant Field Values

LOG

private static final DAILogger LOG

Logger object for this class

mDataServiceInfo

private DataServiceInfo mDataServiceInfo

Information about a data service/resource to contact

mWebRowSet

private java.lang.String mWebRowSet

XML element of WebRowSet as a string

mSqlStatement

private java.lang.String mSqlStatement

SQL query statement to submit to data service/resource

Constructor Detail

CallDataService

CallDataService(org.w3c.dom.Element element,
                DataServiceInfo dataServiceInfo,
                java.lang.String sqlStatement)
          throws ActivityCreationException,
                 ActivitySpecificationException

Constructor.
Parameters:: element - Activity XML from request; dataServiceInfo - Info about the data service/resource to contact; sqlStatement - SQL query statement to submit.

Method Detail

getResult

java.lang.String getResult()

Gets the WebRowSet containing the query results.

Returns:: WebRowSet

run

public void run()

Specified by:: run in interface java.lang.Runnable

processBlock

protected 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.