guarana.toolkit.task.routers
Class Resequencer
java.lang.Object
guarana.util.observer.smart.SmartObservable
guarana.framework.task.Task
guarana.toolkit.task.routers.Router
guarana.toolkit.task.routers.Resequencer
- All Implemented Interfaces:
- ISource, guarana.util.observer.smart.ISmartObserver
public class Resequencer
- extends Router
Rebuild the correct sequence of split messages. When this sequence is completed this task
publishes all messages in the sequence order to the output gateway.
A resequencer does not change the state of inbound messages.
It means the MESSAGE_ID is kept the same!
Graphical notation:
This is an Integration Pattern implementation
Problem: How can we get a stream of related but out-of-sequence messages back into the correct order?
Solution: Use a stateful filter, a Resequencer, to collect and re-order messages so that they can be published to the output channel in a specified order.
- Since:
- Guaranį SDK 1.0.0
- Author:
- Rafael Z. Frantz
- See Also:
- Resequencer pattern by Gregor Hohpe and Bobby Woolf for more details.
Details:
- Number of Inputs: 1
- Number of Outputs: 1
Constructor Summary |
Resequencer(String name)
Constructs a new resequencer task. |
Resequencer(String name,
int numberOfInputs,
int numberOfOutputs)
Constructs a new resequencer task. |
Method Summary |
void |
execute()
This method executes 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 |
Resequencer
public Resequencer(String name)
- Constructs a new resequencer task.
- Parameters:
name
- The name of the resequencer task.
Resequencer
public Resequencer(String name,
int numberOfInputs,
int numberOfOutputs)
- Constructs a new resequencer 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.
execute
public void execute()
throws TaskExecutionException
- This method executes the business logic of this task. It is automatically invoked by workers.
- Overrides:
execute
in class Task
- Throws:
TaskExecutionException
- to report any exception that has occurred during the execution of this method.- See Also:
TaskExecutionException
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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