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complicated / too many steps","tooComplicatedTooManySteps","thumb-down"],["Out of date","outOfDate","thumb-down"],["Samples / code issue","samplesCodeIssue","thumb-down"],["Other","otherDown","thumb-down"]],["Last updated 2025-08-14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 communication with the Cloud Pub/Sub service for event reception.\u003c/p\u003e\n"],["\u003cp\u003eIt includes a list of available versions of the \u003ccode\u003eSubscriberConnection\u003c/code\u003e class, ranging from version 2.11.0 up to the latest release candidate 2.37.0-rc, and describes the version 2.34.0 specifically in more detail.\u003c/p\u003e\n"],["\u003cp\u003eThe \u003ccode\u003eSubscriberConnection\u003c/code\u003e interface allows the implementation of custom behavior, such as through the use of mocks, for testing purposes.\u003c/p\u003e\n"],["\u003cp\u003eKey functions of \u003ccode\u003eSubscriberConnection\u003c/code\u003e include \u003ccode\u003eSubscribe\u003c/code\u003e, \u003ccode\u003eExactlyOnceSubscribe\u003c/code\u003e, \u003ccode\u003ePull\u003c/code\u003e, and \u003ccode\u003eoptions\u003c/code\u003e, each serving a distinct role in managing subscriptions and configurations.\u003c/p\u003e\n"],["\u003cp\u003e\u003ccode\u003eSubscriberConnection\u003c/code\u003e also uses the \u003ccode\u003e*Params\u003c/code\u003e nested class to avoid issues when changing the number or type of arguments to member functions.\u003c/p\u003e\n"]]],[],null,[]]
