pub enum SystemConsumerStrategy {
    DispatchToSingle,
    RoundRobin,
    Pinned,
    PinnedByCorrelation,
    Custom(String),
}
Expand description

System supported consumer strategies for use with persistent subscriptions.

Variants

DispatchToSingle

Distributes events to a single client until the bufferSize is reached. After which the next client is selected in a round robin style, and the process is repeated.

RoundRobin

Distributes events to all clients evenly. If the client buffer-size is reached the client is ignored until events are acknowledged/not acknowledged.

Pinned

For use with an indexing projection such as the system $by_category projection. Event Store inspects event for its source stream id, hashing the id to one of 1024 buckets assigned to individual clients. When a client disconnects it’s buckets are assigned to other clients. When a client connects, it is assigned some of the existing buckets. This naively attempts to maintain a balanced workload. The main aim of this strategy is to decrease the likelihood of concurrency and ordering issues while maintaining load balancing. This is not a guarantee, and you should handle the usual ordering and concurrency issues.

PinnedByCorrelation

Custom(String)

Trait Implementations

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