This interface defines pure-virtual methods for each of the user-facing overload sets in Table. This allows users to inject custom behavior (e.g., with a Google Mock object) in a Table object for use in their own tests.
This class opens a number of gRPC Channels upon its construction. These channels each initiate a connection to the Cloud Bigtable service. This is a relatively slow operation that can take milliseconds, so applications are advised to reuse DataConnection objects when possible.
The exact number of channels can be configured with the google::cloud::GrpcNumChannelsOption. If this option is not set, the class creates between 1 and 64 channels. The specific algorithm and number of channels is an implementation detail, and subject to change without notice.
Each request sent from the client library cycles through the channels in the connection pool in a round robin fashion.
Unused gRPC channels can enter an idle state. Refreshing them during a request may incur additional latency. To avoid this, the client library keeps connections open by refreshing the channels in a background thread. Advanced users can configure the frequency of the refreshes, or disable this feature, by using bigtable::MinConnectionRefreshOption and bigtable::MaxConnectionRefreshOption.
[[["Easy to understand","easyToUnderstand","thumb-up"],["Solved my problem","solvedMyProblem","thumb-up"],["Other","otherUp","thumb-up"]],[["Hard to understand","hardToUnderstand","thumb-down"],["Incorrect information or sample code","incorrectInformationOrSampleCode","thumb-down"],["Missing the information/samples I need","missingTheInformationSamplesINeed","thumb-down"],["Other","otherDown","thumb-down"]],["Last updated 2025-03-05 UTC."],[[["This page details the `DataConnection` class, which serves as an interface for connecting to the Cloud Bigtable Data API within the C++ client library."],["The `DataConnection` class manages a pool of gRPC channels to optimize connections to the Cloud Bigtable service, enhancing performance by reusing connections."],["Users can inject custom behavior into a `Table` object through this `DataConnection` interface, making it very useful for testing by mocking using objects like the `bigtable_mocks::MockDataConnection` class."],["The number of channels in the connection pool is configurable, or set between 1-64 by default, and the channels cycle in a round-robin fashion."],["The page lists all versions of the `DataConnection` class, from the latest `2.37.0-rc` to `2.11.0`, along with the functions supported by this class."]]],[]]
