c

akka.cluster.sharding.typed

Murmur2MessageExtractor

final class Murmur2MessageExtractor[M] extends ShardingMessageExtractor[ShardingEnvelope[M], M]

The murmur2 message extractor uses the same algorithm as the default kafka partitioner allowing kafka partitions to be mapped to shards. This can be used with the akka.cluster.sharding.external.ExternalShardAllocationStrategy to have messages processed locally.

Extend Murmur2NoEnvelopeMessageExtractor to not use a message envelope extractor.

Source
Murmur2MessageExtractor.scala
Linear Supertypes
ShardingMessageExtractor[ShardingEnvelope[M], M], AnyRef, Any
Type Hierarchy
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Inherited
  1. Murmur2MessageExtractor
  2. ShardingMessageExtractor
  3. AnyRef
  4. Any
Implicitly
  1. by any2stringadd
  2. by StringFormat
  3. by Ensuring
  4. by ArrowAssoc
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Visibility
  1. Public
  2. Protected

Instance Constructors

  1. new Murmur2MessageExtractor(numberOfShards: Int)

Value Members

  1. def entityId(envelope: ShardingEnvelope[M]): String

    Extract the entity id from an incoming message.

    Extract the entity id from an incoming message. If null is returned the message will be unhandled, i.e. posted as Unhandled messages on the event stream

    Definition Classes
    → ShardingMessageExtractor
  2. val numberOfShards: Int
  3. def shardId(entityId: String): String

    The shard identifier for a given entity id.

    The shard identifier for a given entity id. Only messages that passed the ShardingMessageExtractor#entityId function will be used as input to this function.

    Definition Classes
    → ShardingMessageExtractor
  4. def unwrapMessage(envelope: ShardingEnvelope[M]): M

    Extract the message to send to the entity from an incoming message.

    Extract the message to send to the entity from an incoming message. Note that the extracted message does not have to be the same as the incoming message to support wrapping in message envelope that is unwrapped before sending to the entity actor.

    Definition Classes
    → ShardingMessageExtractor