HashFunction (flink-cdc-parent 3.8-SNAPSHOT API)

Type Parameters:

T - the type of given event.

All Known Implementing Classes:

PaimonHashFunction
```
@Internal
public interface HashFunction<T>
```
The hash function used to calculate the hash code from a given event.

Nested Class Summary

Nested Classes
Modifier and Type Interface Description

static interface HashFunction.HashContext
Runtime context for calculating an event hash code.

Method Summary

All Methods Static Methods Instance Methods Abstract Methods Default Methods
Modifier and Type	Method	Description
`static HashFunction.HashContext`	`createContext(int sourceSubtaskIndex, int downstreamParallelism)`	Creates a hash context.
`default int`	`hashcode(HashFunction.HashContext context, T event)`	Calculates the hash code with the runtime hash context.
`int`	`hashcode(T event)`

Method Detail

createContext

static HashFunction.HashContext createContext(int sourceSubtaskIndex,
                                              int downstreamParallelism)

Creates a hash context.

hashcode
```
int hashcode(T event)
```

hashcode
```
default int hashcode(HashFunction.HashContext context,
                     T event)
```
Calculates the hash code with the runtime hash context.
Implementations that do not depend on the context can continue implementing hashcode(Object) only.