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)
[[["Easy to understand","easyToUnderstand","thumb-up"],["Solved my problem","solvedMyProblem","thumb-up"],["Other","otherUp","thumb-up"]],[["Missing the information I need","missingTheInformationINeed","thumb-down"],["Too complicated / too many steps","tooComplicatedTooManySteps","thumb-down"],["Out of date","outOfDate","thumb-down"],["Samples / code issue","samplesCodeIssue","thumb-down"],["Other","otherDown","thumb-down"]],["Last updated 2025-08-14 UTC."],[[["\u003cp\u003eThis webpage details the \u003ccode\u003eSubscriberConnection\u003c/code\u003e class within the Google Cloud Pub/Sub C++ library, offering an interface for receiving events from the Cloud Pub/Sub service.\u003c/p\u003e\n"],["\u003cp\u003eThe page provides a list of versions, from 2.11.0 to the latest release candidate 2.37.0-rc, with links to each version's documentation of the \u003ccode\u003eSubscriberConnection\u003c/code\u003e class.\u003c/p\u003e\n"],["\u003cp\u003e\u003ccode\u003eSubscriberConnection\u003c/code\u003e features pure-virtual functions corresponding to \u003ccode\u003eSubscriber\u003c/code\u003e overloads, enabling users to inject custom behaviors for testing, as with a Google Mock object.\u003c/p\u003e\n"],["\u003cp\u003eThe page includes information on the \u003ccode\u003eSubscriberConnection\u003c/code\u003e interface's key functions, including \u003ccode\u003eSubscribe\u003c/code\u003e, \u003ccode\u003eExactlyOnceSubscribe\u003c/code\u003e, \u003ccode\u003ePull\u003c/code\u003e, and \u003ccode\u003eoptions\u003c/code\u003e, which are crucial for interacting with the Pub/Sub service, as well as the parameters and return types for these functions.\u003c/p\u003e\n"],["\u003cp\u003eUsers may also create their own derived class from the \u003ccode\u003eSubscriberConnection\u003c/code\u003e if they need to mock the class, but in order to do so, they should look at the nested param classes provided.\u003c/p\u003e\n"]]],[],null,[]]
