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C++ Client Libraries | Google Cloud

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An idiomatic C++ client library for Cloud Composer, a service that manages Apache Airflow environments on Google Cloud Platform.

While this library is GA, please note Google Cloud C++ client libraries do not follow Semantic Versioning.

The following shows the code that you'll run in the google/cloud/composer/quickstart/ directory, which should give you a taste of the Cloud Composer C++ client library API.

#include "google/cloud/composer/v1/environments_client.h"
#include <iostream>

int main(int argc, char* argv[]) try {
  if (argc != 3) {
    std::cerr << "Usage: " << argv[0] << " project-id location-id\n";
    return 1;
  }

  namespace composer = ::google::cloud::composer_v1;
  auto client =
      composer::EnvironmentsClient(composer::MakeEnvironmentsConnection());

  auto const parent =
      std::string("projects/") + argv[1] + "/locations/" + argv[2];
  for (auto e : client.ListEnvironments(parent)) {
    if (!e) throw std::move(e).status();
    std::cout << e->DebugString() << "\n";
  }

  return 0;
} catch (google::cloud::Status const& status) {
  std::cerr << "google::cloud::Status thrown: " << status << "\n";
  return 1;
}

This library offers multiple *Client classes, which are listed below. Each one of these classes exposes all the RPCs for a gRPC service as member functions of the class. This library groups multiple gRPC services because they are part of the same product or are often used together. A typical example may be the administrative and data plane operations for a single product.

The library also has other classes that provide helpers, configuration parameters, and infrastructure to mock the *Client classes when testing your application.

• composer_v1::EnvironmentsClient
• composer_v1::ImageVersionsClient

The library automatically retries requests that fail with transient errors, and uses exponential backoff to backoff between retries. Application developers can override the default policies.

• Error Handling - describes how the library reports errors.
• How to Override the Default Endpoint - describes how to override the default endpoint.
• How to Override the Authentication Credentials - describes how to change the authentication credentials used by the library.
• Environment Variables - describes environment variables that can configure the behavior of the library.

Except as otherwise noted, the content of this page is licensed under the Creative Commons Attribution 4.0 License, and code samples are licensed under the Apache 2.0 License. For details, see the Google Developers Site Policies. Java is a registered trademark of Oracle and/or its affiliates.

Last updated 2025-08-14 UTC.

[[["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 2025-08-14 UTC."],[[["This webpage provides documentation for the Cloud Composer C++ Client Library, which is a GA idiomatic client library for managing Apache Airflow environments on Google Cloud Platform."],["The latest version of the library is 2.37.0-rc, and the page lists many previous versions of the library starting from version 2.36.0 down to 2.11.0, providing a full view of release history."],["The documentation includes code examples, such as a quickstart guide demonstrating how to list environments using the `EnvironmentsClient` class, in addition to showcasing `ImageVersionsClient`."],["The library automatically implements retry and exponential backoff policies for transient errors, but these default behaviors can be customized by developers."],["The document also features detailed instructions on how to handle errors, override endpoints and authentication credentials, and use environment variables to change the behavior of the library."]]],[]]

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