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object PartitioningStrategy

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  1. type RequestMerger[Req <: ThriftStructIface] = (Seq[Req]) ⇒ Req

    A request merger defines the merger function needed to define a Finagle partitioning service for Thrift services.

    A request merger defines the merger function needed to define a Finagle partitioning service for Thrift services.

    This is used for HashingPartitioningStrategy, which applies a consistent hashing partitioning strategy under the hood. Note that more than one request may fall in the same HashNode, even though they're assigned with different hashing keys. It merges a collection of requests to a final request which matches the Thrift IDL definition. RequestMerger is registered through RequestMergerRegistry

    for example:

    i32 example(1: string in)

val requestMerger: RequestMerger[Example.Args] = listArgs =>
  Example.Args(in = listArgs.map(_.in).mkString(";"))
  2. final class RequestMergerRegistry extends AnyRef

    Maintain a map of method name to method's RequestMerger.

  3. type ResponseMerger[Rep] = (Seq[Rep], Seq[Throwable]) ⇒ Try[Rep]

    A response merger defines the merger function needed to define a Finagle partitioning service for Thrift services.

    A response merger defines the merger function needed to define a Finagle partitioning service for Thrift services.

    This is used for messaging fan-out, it merges a collection of successful responses and a collection of failures to a final response which matches the Thrift IDL definition. ResponseMerger is registered through ResponseMergerRegistry.

    Failing sub-responses are expected to be handled by the application (proper logging, exception handling, etc),

    for example:

    string example(1: i32 a)

val responseMerger: ResponseMerger[String] = (successes, failures) =>
  if (successes.nonEmpty) Return(successes.mkString(";"))
  else Throw(failures.head)
  4. final class ResponseMergerRegistry extends AnyRef

    Maintain a map of method name to method's ResponseMerger.

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