final class HashCodeMessageExtractor[M] extends ShardingMessageExtractor[ShardingEnvelope[M], M]
Default message extractor type, using envelopes to identify what entity a message is for and the hashcode of the entityId to decide which shard an entity belongs to.
This is recommended since it does not force details about sharding into the entity protocol
- M
The type of message accepted by the entity actor
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def
entityId(envelope: ShardingEnvelope[M]): String
Extract the entity id from an incoming
message
.Extract the entity id from an incoming
message
. Ifnull
is returned the message will beunhandled
, i.e. posted asUnhandled
messages on the event stream- Definition Classes
- HashCodeMessageExtractor → ShardingMessageExtractor
- val numberOfShards: Int
-
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
- HashCodeMessageExtractor → ShardingMessageExtractor
-
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
- HashCodeMessageExtractor → ShardingMessageExtractor