A connection to the Cloud Pub/Sub service to publish events.
This interface defines pure-virtual methods for each of the user-facing overload sets in Publisher. That is, all of Publisher's overloads will forward to the one pure-virtual method declared in this interface. This allows users to inject custom behavior (e.g., with a Google Mock object) in a Publisher object for use in their own tests.
To create a concrete instance that connects you to the real Cloud Pub/Sub service, see MakePublisherConnection().
The *Params nested classes
Applications may define classes derived from PublisherConnection, 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.
[[["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complicated / too many steps","tooComplicatedTooManySteps","thumb-down"],["Out of date","outOfDate","thumb-down"],["Samples / code issue","samplesCodeIssue","thumb-down"],["Other","otherDown","thumb-down"]],["Last updated 2025-08-14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 content provides documentation for the \u003ccode\u003ePublisherConnection\u003c/code\u003e class in the Google Cloud Pub/Sub C++ library, with the latest release candidate version being 2.37.0-rc.\u003c/p\u003e\n"],["\u003cp\u003e\u003ccode\u003ePublisherConnection\u003c/code\u003e defines pure-virtual methods that correspond to the overloads in the \u003ccode\u003ePublisher\u003c/code\u003e class, enabling users to inject custom behavior for testing purposes.\u003c/p\u003e\n"],["\u003cp\u003eThe \u003ccode\u003eMakePublisherConnection()\u003c/code\u003e function facilitates the creation of a concrete connection to the actual Cloud Pub/Sub service.\u003c/p\u003e\n"],["\u003cp\u003eThe documentation outlines three key functions: \u003ccode\u003ePublish()\u003c/code\u003e, \u003ccode\u003eFlush()\u003c/code\u003e, and \u003ccode\u003eResumePublish()\u003c/code\u003e, which define the interfaces for their corresponding \u003ccode\u003ePublisher\u003c/code\u003e methods.\u003c/p\u003e\n"],["\u003cp\u003eLightweight structures called *Params nested classes, are employed to avoid breaking derived classes when the arguments of the member functions are modified.\u003c/p\u003e\n"]]],[],null,[]]
