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complicated / too many steps","tooComplicatedTooManySteps","thumb-down"],["Out of date","outOfDate","thumb-down"],["Samples / code issue","samplesCodeIssue","thumb-down"],["Other","otherDown","thumb-down"]],["Last updated 2025-08-14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\u003eThis page details the \u003ccode\u003ePublisherConnection\u003c/code\u003e class, which provides an interface for connecting to the Cloud Pub/Sub service to publish events.\u003c/p\u003e\n"],["\u003cp\u003eThe latest version available is 2.37.0-rc, while the current version of the documentation is 2.35.0, with versions ranging back to 2.11.0.\u003c/p\u003e\n"],["\u003cp\u003e\u003ccode\u003ePublisherConnection\u003c/code\u003e uses pure-virtual methods that mirror the user-facing overloads in the \u003ccode\u003ePublisher\u003c/code\u003e class, allowing for the injection of custom behavior, like mock objects.\u003c/p\u003e\n"],["\u003cp\u003eThe \u003ccode\u003ePublisherConnection\u003c/code\u003e class defines \u003ccode\u003ePublish\u003c/code\u003e, \u003ccode\u003eFlush\u003c/code\u003e, and \u003ccode\u003eResumePublish\u003c/code\u003e functions, each with corresponding parameter classes like \u003ccode\u003ePublishParams\u003c/code\u003e, \u003ccode\u003eFlushParams\u003c/code\u003e, and \u003ccode\u003eResumePublishParams\u003c/code\u003e.\u003c/p\u003e\n"],["\u003cp\u003eA concrete \u003ccode\u003ePublisherConnection\u003c/code\u003e instance for real Cloud Pub/Sub interaction can be created via the \u003ccode\u003eMakePublisherConnection()\u003c/code\u003e function.\u003c/p\u003e\n"]]],[],null,[]]
