MultiInputWatermarkManager (Nemo Project 0.4 API)

java.lang.Object
- org.apache.nemo.runtime.executor.datatransfer.MultiInputWatermarkManager

All Implemented Interfaces:

InputWatermarkManager
```
public final class MultiInputWatermarkManager
extends java.lang.Object
implements InputWatermarkManager
```
This tracks the minimum input watermark among multiple input streams.

Constructor Summary

Constructors
Constructor Description

MultiInputWatermarkManager(int numEdges, OutputCollector<?> watermarkCollector)

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`void`	`trackAndEmitWatermarks(int edgeIndex, Watermark watermark)`	This tracks the minimum input watermark among multiple input streams.

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

- Constructor Detail
  - MultiInputWatermarkManager
```
public MultiInputWatermarkManager(int numEdges,
                                  OutputCollector<?> watermarkCollector)
```
- Method Detail
  - trackAndEmitWatermarks
```
public void trackAndEmitWatermarks(int edgeIndex,
                                   Watermark watermark)
```
    Description copied from interface: InputWatermarkManager
    
    This tracks the minimum input watermark among multiple input streams. This method is not a Thread-safe so the caller should synchronize it if multiple threads access this method concurrently. Ex) -- input stream1 (edge 1): ---------- ts: 3 ------------------ts: 6 ^^^ emit ts: 4 (edge 2) watermark at this time -- input stream2 (edge 2): ----------------- ts: 4------ ^^^ emit ts: 3 (edge 1) watermark at this time -- input stream3 (edge 3): ------- ts: 5 ---------------
    
    Specified by:
    
    trackAndEmitWatermarks in interface InputWatermarkManager
    
    Parameters:
    
    edgeIndex - incoming edge index
    
    watermark - watermark emitted from the edge