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complicated / too many steps","tooComplicatedTooManySteps","thumb-down"],["Out of date","outOfDate","thumb-down"],["Samples / code issue","samplesCodeIssue","thumb-down"],["Other","otherDown","thumb-down"]],["Last updated 2025-08-14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."],[[["This webpage details the `PublisherConnection` class within the Google Cloud Pub/Sub C++ library, focusing on its role in publishing events to the service."],["The `PublisherConnection` interface defines pure-virtual methods, mirroring the user-facing overloads in the `Publisher` class, to allow for custom behavior injection during testing, such as mocking."],["Concrete instances for interacting with the real Cloud Pub/Sub service can be created using the `MakePublisherConnection()` function."],["The class uses `*Params` nested classes as lightweight structures for passing arguments, in order to avoid breaking derived classes when function signatures change."],["The interface includes virtual functions for `Publish()`, `Flush()`, and `ResumePublish()`, each having their own parameter structures and corresponding return types."]]],[]]
