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

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uk.org.ogsadai.activity
Class ObserverActivity

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

class ObserverActivity
extends Activity

This is a special kind of activity used internally for observing the status of an activity that is driven by an external output. The activity will complete processing only when the activity that it has been observing reaches a finished state.

Author:: The OGSA-DAI Project Team

Field Summary
`private static java.lang.String`	`COPYRIGHT_NOTICE` Copyright statement
`private static DAILogger`	`LOG` Logger object for logging in this class
`private boolean`	`mWaiting` Indicates whether we need to wait for the activity to finish.

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

mContext, mExternalInputs, mExternalOutputs, mInternalInputs, mInternalOutputs

Constructor Summary
`(package private)`	`ObserverActivity(Activity activity)` Constructs an `ObserverActivity` that will observe the status of another activity.

Method Summary
`void`	`processBlock()` Performs an iteration of the processing of an activity.

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

cleanUp, configureContext, connectsTo, createOutputPipe, getActivityConfiguration, getActivityName, getAllOutputs, getCause, getExternalInputs, getExternalOutputs, getInputs, getName, getObservableStatus, getOutputs, getProperties, getSession, getStatus, hasActivityConfiguration, hasProperties, initialise, process, processFirst, setActivityConfiguration, setActivityName, setCompleted, setError, setProperties, terminate

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 logging in this class

mWaiting

private boolean mWaiting

Indicates whether we need to wait for the activity to finish.

Constructor Detail

ObserverActivity

ObserverActivity(Activity activity)

Constructs an ObserverActivity that will observe the status of another activity. This activity should be one that is driven by an external output.
Parameters:: activity - An Activity that is driven by an external output.

Method Detail

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.