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complicated / too many steps","tooComplicatedTooManySteps","thumb-down"],["Out of date","outOfDate","thumb-down"],["Samples / code issue","samplesCodeIssue","thumb-down"],["Other","otherDown","thumb-down"]],["Last updated 2025-08-14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 document details the \u003ccode\u003eSubscriberConnection\u003c/code\u003e interface, which facilitates receiving events from the Cloud Pub/Sub service and is currently at version 2.22.1.\u003c/p\u003e\n"],["\u003cp\u003eThe \u003ccode\u003eSubscriberConnection\u003c/code\u003e interface uses pure-virtual functions, enabling users to inject custom behaviors into \u003ccode\u003eSubscriber\u003c/code\u003e objects, particularly for testing purposes.\u003c/p\u003e\n"],["\u003cp\u003eThe document lists several versions of the interface, ranging from the latest release candidate (2.37.0-rc) down to 2.11.0.\u003c/p\u003e\n"],["\u003cp\u003eThe interface defines key functions like \u003ccode\u003eSubscribe\u003c/code\u003e, \u003ccode\u003eExactlyOnceSubscribe\u003c/code\u003e, \u003ccode\u003ePull\u003c/code\u003e, and \u003ccode\u003eoptions\u003c/code\u003e, with parameters passed through lightweight structures to maintain compatibility.\u003c/p\u003e\n"],["\u003cp\u003eIt allows users to connect to the actual Cloud Pub/Sub service using \u003ccode\u003eMakeSubscriberConnection()\u003c/code\u003e and explains that \u003ccode\u003eSubscriberConnection\u003c/code\u003e derived classes can be created for mocking purposes.\u003c/p\u003e\n"]]],[],null,[]]
