NewDemultiplexingBuildQueue creates an adapter for the Execution service to forward requests to different backends backed on the instance given in requests.

NewForwardingBuildQueue creates a GRPC service for the Capabilities and Execution service that simply forwards all requests to a GRPC client.

NewNonExecutableBuildQueue creates a build queue that is incapable of executing anything.

NewUpdatableActionCacheBuildQueue alters the response of GetCapabilities() to announce that this build queue allows direct writing to the Action Cache.

BuildQueue is an interface for the set of operations that a scheduler process must implement.

BuildQueueGetter is the callback invoked by the demultiplexing build queue to obtain a backend that matches the instance name that is provided.