StepObserverRegistry (Eoulsan 2.6.1 API)

java.lang.Object
- fr.ens.biologie.genomique.eoulsan.core.workflow.StepObserverRegistry

```
public class StepObserverRegistry
extends Object
```
This class allow to relay workflow step events to other observers. This class avoid storing observers WorkflowStep objects that are serialized.

Since:

2.0

Author:

Laurent Jourdren

Method Summary

All Methods Static Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`void`	`addObserver(StepObserver observer)`	Add a listener.
`static StepObserverRegistry`	`getInstance()`	Get the singleton instance of WorkflowStepObserverRegistry.
`boolean`	`isNoObserverRegistered()`	Test if observers has been registered
`void`	`removeObserver(StepObserver observer)`	Remove a listener.
`void`	`stepStateEvent(fr.ens.biologie.genomique.eoulsan.core.workflow.StepStateEvent event)`	Handle step state change events.
`void`	`uiStepEvent(UIStepEvent event)`	Handle UI step events.
`void`	`uiTaskEvent(UITaskEvent event)`	Handle UI task events.
`void`	`uiWorkflowEvent(UIWorkflowEvent event)`	Handle UI workflow events.

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Method Detail
  - addObserver
```
public void addObserver(StepObserver observer)
```
    Add a listener.
    
    Parameters:
    
    observer - listener to add
  - removeObserver
```
public void removeObserver(StepObserver observer)
```
    Remove a listener.
    
    Parameters:
    
    observer - listener to remove
  - isNoObserverRegistered
```
public boolean isNoObserverRegistered()
```
    Test if observers has been registered
    
    Returns:
    
    true if observers has been registered
  - uiTaskEvent
```
public void uiTaskEvent(UITaskEvent event)
```
    Handle UI task events.
    
    Parameters:
    
    event - the event to handle
  - stepStateEvent
```
public void stepStateEvent(fr.ens.biologie.genomique.eoulsan.core.workflow.StepStateEvent event)
```
    Handle step state change events.
    
    Parameters:
    
    event - the event to handle
  - uiStepEvent
```
public void uiStepEvent(UIStepEvent event)
```
    Handle UI step events.
    
    Parameters:
    
    event - the event to handle
  - uiWorkflowEvent
```
public void uiWorkflowEvent(UIWorkflowEvent event)
```
    Handle UI workflow events.
    
    Parameters:
    
    event - the event to handle
  - getInstance
```
public static StepObserverRegistry getInstance()
```
    Get the singleton instance of WorkflowStepObserverRegistry.
    
    Returns:
    
    the singleton instance of WorkflowStepObserverRegistry