guarana.toolkit.task.modifiers
Class Slimmer
java.lang.Object
guarana.util.observer.smart.SmartObservable
guarana.framework.task.Task
guarana.toolkit.task.modifiers.Modifier
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:
- Number of Inputs: 1
- Number of Outputs: 1
- Java Object of the inbound message is modified and reused for the outbound message!
- Since:
- Guaranį SDK 1.0.0
- Author:
- Rafael Z. Frantz
- See Also:
- Content Filter pattern by Gregor Hohpe and Bobby Woolf for more details.
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.util.observer.smart.SmartObservable |
addSmartObserver, containsSmartObserver, containsSmartObserver, countSmartObservers, deleteSmartObserver, deleteSmartObservers, hasChanged, notifySmartObservers, notifySmartObservers |
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.
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.
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