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complicated / too many steps","tooComplicatedTooManySteps","thumb-down"],["Out of date","outOfDate","thumb-down"],["Samples / code issue","samplesCodeIssue","thumb-down"],["Other","otherDown","thumb-down"]],["Last updated 2025-08-14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 for the Google Cloud Pub/Sub C++ library, specifically for version 2.19.0, which facilitates publishing events to the service.\u003c/p\u003e\n"],["\u003cp\u003eThe interface uses pure-virtual methods that align with the overloads found in the \u003ccode\u003ePublisher\u003c/code\u003e class, allowing users to implement custom behavior, such as mocking, for testing purposes.\u003c/p\u003e\n"],["\u003cp\u003e\u003ccode\u003ePublisherConnection\u003c/code\u003e utilizes lightweight structures, like \u003ccode\u003ePublishParams\u003c/code\u003e and \u003ccode\u003eFlushParams\u003c/code\u003e, to handle arguments in member functions, which helps maintain compatibility across derived classes.\u003c/p\u003e\n"],["\u003cp\u003eThe interface defines functions such as \u003ccode\u003ePublish\u003c/code\u003e, \u003ccode\u003eFlush\u003c/code\u003e, and \u003ccode\u003eResumePublish\u003c/code\u003e, each with their respective parameter and return types for interacting with the Google Cloud Pub/Sub service.\u003c/p\u003e\n"],["\u003cp\u003eThe latest release candidate version for this library is 2.37.0-rc, and there are various release versions to access documentation for, ranging from version 2.11.0 to 2.36.0.\u003c/p\u003e\n"]]],[],null,[]]
