ShardRegion.HashCodeMessageExtractor

java.lang.Object
- akka.cluster.sharding.ShardRegion.HashCodeMessageExtractor

All Implemented Interfaces:

ShardRegion.MessageExtractor

Enclosing class:

ShardRegion
```
public abstract static class ShardRegion.HashCodeMessageExtractor
extends java.lang.Object
implements ShardRegion.MessageExtractor
```
Convenience implementation of ShardRegion.MessageExtractor that construct shardId based on the hashCode of the entityId. The number of unique shards is limited by the given maxNumberOfShards.

Constructor Summary

Constructors
Constructor Description

HashCodeMessageExtractor(int maxNumberOfShards)

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`java.lang.Object`	`entityMessage(java.lang.Object message)`	Default implementation pass on the message as is.
`java.lang.String`	`shardId(java.lang.Object message)`	Extract the shard id from an incoming `message`.

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

Methods inherited from interface akka.cluster.sharding.ShardRegion.MessageExtractor
entityId

- Constructor Detail
  - HashCodeMessageExtractor
```
public HashCodeMessageExtractor(int maxNumberOfShards)
```
- Method Detail
  - entityMessage
```
public java.lang.Object entityMessage(java.lang.Object message)
```
    Default implementation pass on the message as is.
    
    Specified by:
    
    entityMessage in interface ShardRegion.MessageExtractor
  - shardId
```
public java.lang.String shardId(java.lang.Object message)
```
    Description copied from interface: ShardRegion.MessageExtractor
    
    Extract the shard id from an incoming message. Only messages that passed the ShardRegion.MessageExtractor.entityId(java.lang.Object) function will be used as input to this function.
    
    Specified by:
    
    shardId in interface ShardRegion.MessageExtractor