HeadlessEventCollector

All Known Implementing Classes:

AttributeSummarizer, CostBenefitAnalysis, DataVisualizer, ModelPerformanceChart, ScatterPlotMatrix, TextViewer
```
public interface HeadlessEventCollector
```
Interface for Knowledge Flow components that (typically) provide an interactive graphical visualization to implement. This allows events that would normally be processed to provide a graphical display to be collected and retrieved when running in headless mode (perhaps on a server for example). A copy of the component that is running with access to a display can be passed the list of events in order to construct its display-dependent output.

Version:

$Revision: 8034 $

Author:

Mark Hall (mhall{[at]}pentaho{[dot]}com).

Method Summary

All Methods Instance Methods Abstract Methods
Modifier and Type	Method	Description
`void`	`processHeadlessEvents(java.util.List<java.util.EventObject> headless)`	Process a list of events that have been collected earlier.
`java.util.List<java.util.EventObject>`	`retrieveHeadlessEvents()`	Get the list of events processed in headless mode.

- Method Detail
  - retrieveHeadlessEvents
```
java.util.List<java.util.EventObject> retrieveHeadlessEvents()
```
    Get the list of events processed in headless mode. May return null or an empty list if not running in headless mode or no events were processed
    
    Returns:
    
    a list of EventObjects or null.
  - processHeadlessEvents
```
void processHeadlessEvents(java.util.List<java.util.EventObject> headless)
```
    Process a list of events that have been collected earlier. Has no affect if the component is running in headless mode.
    
    Parameters:
    
    headless - a list of EventObjects to process.