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complicated / too many steps","tooComplicatedTooManySteps","thumb-down"],["Out of date","outOfDate","thumb-down"],["Samples / code issue","samplesCodeIssue","thumb-down"],["Other","otherDown","thumb-down"]],["Last updated 2025-08-14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 for connecting to the Cloud Pub/Sub service to receive events.\u003c/p\u003e\n"],["\u003cp\u003eThe page lists different versions of \u003ccode\u003eSubscriberConnection\u003c/code\u003e, with version 2.37.0-rc being the latest release candidate.\u003c/p\u003e\n"],["\u003cp\u003eThe \u003ccode\u003eSubscriberConnection\u003c/code\u003e class includes pure-virtual functions like \u003ccode\u003eSubscribe\u003c/code\u003e, \u003ccode\u003eExactlyOnceSubscribe\u003c/code\u003e, and \u003ccode\u003ePull\u003c/code\u003e that are designed to be implemented.\u003c/p\u003e\n"],["\u003cp\u003e\u003ccode\u003eSubscriberConnection\u003c/code\u003e facilitates creating mock implementations for testing purposes and can be used in conjunction with \u003ccode\u003eMakeSubscriberConnection()\u003c/code\u003e for real Cloud Pub/Sub service connections.\u003c/p\u003e\n"],["\u003cp\u003eThe class uses lightweight parameter structures, such as \u003ccode\u003eSubscribeParams\u003c/code\u003e and \u003ccode\u003eExactlyOnceSubscribeParams\u003c/code\u003e, to manage the function arguments efficiently.\u003c/p\u003e\n"]]],[],null,[]]
