uk.org.ogsadai.activity.delivery
Class InputStreamActivity
java.lang.Object
|
+--uk.org.ogsadai.activity.Activity
|
+--uk.org.ogsadai.activity.delivery.InputStreamActivity
- public class InputStreamActivity
- extends Activity
Create an input stream that is exposed via a service's data transport putFully/Block operations.
For information on this activity see the OGSA-DAI user doc: OGSA-DAI/doc/interaction/activities/delivery/inputStream.html
- 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 BlockReader |
mInput
Activity input - data from client via data transport operations |
private BlockWriter |
mOutput
Activity output - data from the client received from the input |
| 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 |
COPYRIGHT_NOTICE
private static final java.lang.String COPYRIGHT_NOTICE
-
Copyright statement
- See Also:
- Constant Field Values
LOG
private static DAILogger LOG
-
Logger object for logging in this class
mInput
private BlockReader mInput
-
Activity input - data from client via data transport operations
mOutput
private BlockWriter mOutput
-
Activity output - data from the client received from the input
InputStreamActivity
public InputStreamActivity(org.w3c.dom.Element element)
throws ActivityCreationException,
ActivitySpecificationException
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
-