Class SubscriberConnection (2.21.0)

A connection to the Cloud Pub/Sub service to receive events.

This interface defines pure-virtual functions for each of the user-facing overload sets in Subscriber. That is, all of Subscriber's overloads will forward to the one pure-virtual function declared in this interface. This allows users to inject custom behavior (e.g., with a Google Mock object) in a Subscriber object for use in their own tests.

To create a concrete instance that connects you to the real Cloud Pub/Sub service, see MakeSubscriberConnection().

The *Params nested classes

Applications may define classes derived from SubscriberConnection, for example, because they want to mock the class. To avoid breaking all such derived classes when we change the number or type of the arguments to the member functions we define lightweight structures to pass the arguments.

Functions

virtual Subscribe(SubscribeParams)

Defines the interface for Subscriber::Subscribe(ApplicationCallback)

Parameter
NameDescription
p SubscribeParams
Returns
TypeDescription
future< Status >

virtual ExactlyOnceSubscribe(ExactlyOnceSubscribeParams)

Defines the interface for Subscriber::Subscribe(ExactlyOnceApplicationCallback).

We use a different name for this function (as opposed to an overload) to simplify the use of mocks.

Parameter
NameDescription
p ExactlyOnceSubscribeParams
Returns
TypeDescription
future< Status >

virtual Pull()

Returns
TypeDescription
StatusOr< PullResponse >

virtual options()

Returns the configuration parameters for this object.

Returns
TypeDescription
Options