Alignable (Flink : Runtime 2.1.0 API)

All Known Implementing Classes:

AlignableBoolWatermarkDeclaration, AlignableLongWatermarkDeclaration
```
public interface Alignable
```
An interface used to represent the special WatermarkDeclarations can create aligned Watermarks, which need to be aligned when the operator receives them from input channels. Note that this interface is currently only used for internal implementation.

- Method Summary
  
  All Methods Instance Methods Abstract Methods
  Modifier and Type Method Description
  
  boolean isAligned()
  Represents whether the created Watermark needs to be aligned.

- Method Detail
  - isAligned
```
boolean isAligned()
```
    Represents whether the created Watermark needs to be aligned.