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complicated / too many steps","tooComplicatedTooManySteps","thumb-down"],["Out of date","outOfDate","thumb-down"],["Samples / code issue","samplesCodeIssue","thumb-down"],["Other","otherDown","thumb-down"]],["Last updated 2025-08-14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 document details the \u003ccode\u003ePublisherConnection\u003c/code\u003e interface, which provides a connection to the Cloud Pub/Sub service for publishing events.\u003c/p\u003e\n"],["\u003cp\u003eThe \u003ccode\u003ePublisherConnection\u003c/code\u003e interface contains pure-virtual methods that mirror the overloads found in the \u003ccode\u003ePublisher\u003c/code\u003e class, allowing for custom behavior injection and testing.\u003c/p\u003e\n"],["\u003cp\u003eThe document lists multiple previous versions of the interface, ranging from version 2.11.0 all the way up to the most recent Release Candidate (RC), version 2.37.0-rc, with the current version being 2.32.0.\u003c/p\u003e\n"],["\u003cp\u003eThe \u003ccode\u003ePublisherConnection\u003c/code\u003e class defines three key virtual functions: \u003ccode\u003ePublish()\u003c/code\u003e, \u003ccode\u003eFlush()\u003c/code\u003e, and \u003ccode\u003eResumePublish()\u003c/code\u003e, each with its own set of parameters and return types.\u003c/p\u003e\n"],["\u003cp\u003eApplications can derive classes from \u003ccode\u003ePublisherConnection\u003c/code\u003e to mock the class and pass arguments using lightweight structures to avoid breaking derived classes.\u003c/p\u003e\n"]]],[],null,[]]
