guarana.toolkit.task.modifiers
Class Slimmer

java.lang.Object
  extended by guarana.util.observer.smart.SmartObservable
      extended by guarana.framework.task.Task
          extended by guarana.toolkit.task.modifiers.Modifier
              extended by guarana.toolkit.task.modifiers.Slimmer
All Implemented Interfaces:
ISource, guarana.util.observer.smart.ISmartObserver

public abstract class Slimmer
extends Modifier

Reduces the content of an inbound message's body by removing part of it. All header from the inbound message is kept to the outbound message. Outbound message has a new MESSAGE_ID and the inbound message as its parent.

Graphical notation:


This is an Integration Pattern implementation

Problem: How do you simplify dealing with a large message, when you are interested only in a few data items?

Solution: Use a Content Filter to remove unimportant data items from a message leaving only important items.

Details:

Since:
Guaranį SDK 1.0.0
Author:
Rafael Z. Frantz
See Also:
Content Filter pattern by Gregor Hohpe and Bobby Woolf for more details.

Field Summary
 
Fields inherited from class guarana.framework.task.Task
input, output
 
Constructor Summary
Slimmer(String name)
          Constructs a new slimmer task.
Slimmer(String name, int numberOfInputs, int numberOfOutputs)
          Constructs a new slimmer task.
 
Method Summary
abstract  void doWork(Exchange exchange)
          This method implements the business logic of this task.
 void update(guarana.util.observer.smart.SmartObservable slot, Object arg)
          This method is automatically called by the observable slot to notify the slot has received a message.
 
Methods inherited from class guarana.framework.task.Task
execute, getName, getTriggerInterval, isTriggerTask, setName, setTriggerInterval
 
Methods inherited from class guarana.util.observer.smart.SmartObservable
addSmartObserver, containsSmartObserver, containsSmartObserver, countSmartObservers, deleteSmartObserver, deleteSmartObservers, hasChanged, notifySmartObservers, notifySmartObservers
 
Methods inherited from class java.lang.Object
equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
 

Constructor Detail

Slimmer

public Slimmer(String name)
Constructs a new slimmer task.

Parameters:
name - The name of the slimmer task.

Slimmer

public Slimmer(String name,
               int numberOfInputs,
               int numberOfOutputs)
Constructs a new slimmer task.

Parameters:
name - The name of this task.
numberOfInputs - The number of input gateways this task must have.
numberOfOutputs - The number of output gateways this task must have.
Method Detail

doWork

public abstract void doWork(Exchange exchange)
                     throws TaskExecutionException
This method implements the business logic of this task.
Slims the body of the message body.

Overrides:
doWork in class Task
Parameters:
exchange - An exchange object that holds the inbound messages of this task.
Throws:
TaskExecutionException - to report any exception that has occurred during the execution of this method.

update

public void update(guarana.util.observer.smart.SmartObservable slot,
                   Object arg)
This method is automatically called by the observable slot to notify the slot has received a message. For all those tasks that can execute with one or more messages in its input slots, this method will add the task to the executable task reporter, so it can be executed. In this case the task execution will consume messages from all input slots.
Please, do not call this method by yourself. Overrides the implementation at Task for performance reasons.

Specified by:
update in interface guarana.util.observer.smart.ISmartObserver
Overrides:
update in class Task
Parameters:
slot - The Slot associated with this task.
arg - THIS PARAMETHER IS NOT USED.


Guaranį DSL Home