public Interface ServerCallHandler<RequestT, ResponseT>

Starts asynchronous processing of an incoming call.

Callers of this method transfer their ownership of the non-thread-safe ServerCall and Metadata arguments to the ServerCallHandler implementation for processing. Ownership means that the implementation may invoke methods on call and headers while startCall runs and at any time after it returns normally. On the other hand, if startCall throws, ownership of call and headers reverts to the caller and the implementation loses the right to call methods on these objects (from some other thread, say).

Ownership also includes the responsibility to eventually close call. In particular, if startCall throws an exception, the caller must handle it by closing call with an error. Since call can only be closed once, an implementation can report errors either to ServerCall#close for itself or by throwing an exception, but not both.

Returns a non-null listener for the incoming call. Callers of this method must arrange for events associated with call to be delivered there.

Parameters

call:ServerCall<RequestT, ResponseT>

object for responding to the remote client.

headers:Metadata

request headers received from the client but open to modification by an owner

Returns:ServerCall.Listener<RequestT>

listener for processing incoming request messages for call