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complicated / too many steps","tooComplicatedTooManySteps","thumb-down"],["Out of date","outOfDate","thumb-down"],["Samples / code issue","samplesCodeIssue","thumb-down"],["Other","otherDown","thumb-down"]],["Last updated 2025-08-14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\u003eThe latest version of the \u003ccode\u003eSubscriberConnection\u003c/code\u003e class is 2.37.0-rc, and the page provides links to the documentation for versions dating back to 2.11.0.\u003c/p\u003e\n"],["\u003cp\u003e\u003ccode\u003eSubscriberConnection\u003c/code\u003e serves as an interface for connecting to the Cloud Pub/Sub service to receive events, defining virtual functions that correspond to the overload sets in \u003ccode\u003eSubscriber\u003c/code\u003e.\u003c/p\u003e\n"],["\u003cp\u003eUsers can create custom behavior by deriving from \u003ccode\u003eSubscriberConnection\u003c/code\u003e, enabling the mocking of the class for testing purposes, and \u003ccode\u003eMakeSubscriberConnection()\u003c/code\u003e creates a real connection to Cloud Pub/Sub.\u003c/p\u003e\n"],["\u003cp\u003eThe \u003ccode\u003eSubscriberConnection\u003c/code\u003e interface includes virtual functions like \u003ccode\u003eSubscribe\u003c/code\u003e, \u003ccode\u003eExactlyOnceSubscribe\u003c/code\u003e, \u003ccode\u003ePull\u003c/code\u003e, and \u003ccode\u003eoptions\u003c/code\u003e for receiving messages, configuring the connection, and pulling data.\u003c/p\u003e\n"],["\u003cp\u003eThe page details parameters and return types for the \u003ccode\u003eSubscribe\u003c/code\u003e, \u003ccode\u003eExactlyOnceSubscribe\u003c/code\u003e, \u003ccode\u003ePull\u003c/code\u003e and \u003ccode\u003eoptions\u003c/code\u003e virtual functions within \u003ccode\u003eSubscriberConnection\u003c/code\u003e.\u003c/p\u003e\n"]]],[],null,[]]
