This shows how to override the retry policies for appengine_v1::DomainMappingsClient:
auto options =
google::cloud::Options{}
.set<google::cloud::appengine_v1::
DomainMappingsConnectionIdempotencyPolicyOption>(
CustomIdempotencyPolicy().clone())
.set<google::cloud::appengine_v1::DomainMappingsRetryPolicyOption>(
google::cloud::appengine_v1::
DomainMappingsLimitedErrorCountRetryPolicy(3)
.clone())
.set<google::cloud::appengine_v1::DomainMappingsBackoffPolicyOption>(
google::cloud::ExponentialBackoffPolicy(
/*initial_delay=*/std::chrono::milliseconds(200),
/*maximum_delay=*/std::chrono::seconds(45),
/*scaling=*/2.0)
.clone());
auto connection =
google::cloud::appengine_v1::MakeDomainMappingsConnection(options);
// c1 and c2 share the same retry policies
auto c1 = google::cloud::appengine_v1::DomainMappingsClient(connection);
auto c2 = google::cloud::appengine_v1::DomainMappingsClient(connection);
// You can override any of the policies in a new client. This new client
// will share the policies from c1 (or c2) *except* for the retry policy.
auto c3 = google::cloud::appengine_v1::DomainMappingsClient(
connection,
google::cloud::Options{}
.set<google::cloud::appengine_v1::DomainMappingsRetryPolicyOption>(
google::cloud::appengine_v1::DomainMappingsLimitedTimeRetryPolicy(
std::chrono::minutes(5))
.clone()));
// You can also override the policies in a single call:
// c3.SomeRpc(..., google::cloud::Options{}
// .set<google::cloud::appengine_v1::DomainMappingsRetryPolicyOption>(
// google::cloud::appengine_v1::DomainMappingsLimitedErrorCountRetryPolicy(10).clone()));
Assuming you have created a custom idempotency policy. Such as:
class CustomIdempotencyPolicy : public google::cloud::appengine_v1::
DomainMappingsConnectionIdempotencyPolicy {
public:
~CustomIdempotencyPolicy() override = default;
std::unique_ptr<
google::cloud::appengine_v1::DomainMappingsConnectionIdempotencyPolicy>
clone() const override {
return std::make_unique<CustomIdempotencyPolicy>(*this);
}
// Override inherited functions to define as needed.
};
[[["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."],[[["\u003cp\u003eThe latest version available for the App Engine Domain Mappings Client is 2.37.0-rc, with a list of prior versions ranging down to 2.11.0 also accessible.\u003c/p\u003e\n"],["\u003cp\u003eYou can customize retry policies for the \u003ccode\u003eappengine_v1::DomainMappingsClient\u003c/code\u003e by setting options like \u003ccode\u003eDomainMappingsConnectionIdempotencyPolicyOption\u003c/code\u003e, \u003ccode\u003eDomainMappingsRetryPolicyOption\u003c/code\u003e, and \u003ccode\u003eDomainMappingsBackoffPolicyOption\u003c/code\u003e.\u003c/p\u003e\n"],["\u003cp\u003eClients created from the same connection share the same retry policies, but new clients can override specific policies, such as setting a \u003ccode\u003eDomainMappingsLimitedTimeRetryPolicy\u003c/code\u003e with a time limit.\u003c/p\u003e\n"],["\u003cp\u003eRetry policies can also be overridden for individual calls to methods of the \u003ccode\u003eappengine_v1::DomainMappingsClient\u003c/code\u003e, allowing fine-grained control over retries on a per-call basis.\u003c/p\u003e\n"],["\u003cp\u003eIt is possible to define custom idempotency policies by inheriting the \u003ccode\u003eDomainMappingsConnectionIdempotencyPolicy\u003c/code\u003e class and overriding the relevant methods.\u003c/p\u003e\n"]]],[],null,["Version latestkeyboard_arrow_down\n\n- [2.42.0-rc (latest)](/cpp/docs/reference/appengine/latest/appengine_v1_1_1DomainMappingsClient-retry-snippet)\n- [2.41.0](/cpp/docs/reference/appengine/2.41.0/appengine_v1_1_1DomainMappingsClient-retry-snippet)\n- [2.40.0](/cpp/docs/reference/appengine/2.40.0/appengine_v1_1_1DomainMappingsClient-retry-snippet)\n- [2.39.0](/cpp/docs/reference/appengine/2.39.0/appengine_v1_1_1DomainMappingsClient-retry-snippet)\n- [2.38.0](/cpp/docs/reference/appengine/2.38.0/appengine_v1_1_1DomainMappingsClient-retry-snippet)\n- [2.37.0](/cpp/docs/reference/appengine/2.37.0/appengine_v1_1_1DomainMappingsClient-retry-snippet)\n- [2.36.0](/cpp/docs/reference/appengine/2.36.0/appengine_v1_1_1DomainMappingsClient-retry-snippet)\n- [2.35.0](/cpp/docs/reference/appengine/2.35.0/appengine_v1_1_1DomainMappingsClient-retry-snippet)\n- [2.34.0](/cpp/docs/reference/appengine/2.34.0/appengine_v1_1_1DomainMappingsClient-retry-snippet)\n- [2.33.0](/cpp/docs/reference/appengine/2.33.0/appengine_v1_1_1DomainMappingsClient-retry-snippet)\n- [2.32.0](/cpp/docs/reference/appengine/2.32.0/appengine_v1_1_1DomainMappingsClient-retry-snippet)\n- [2.31.0](/cpp/docs/reference/appengine/2.31.0/appengine_v1_1_1DomainMappingsClient-retry-snippet)\n- [2.30.0](/cpp/docs/reference/appengine/2.30.0/appengine_v1_1_1DomainMappingsClient-retry-snippet)\n- [2.29.0](/cpp/docs/reference/appengine/2.29.0/appengine_v1_1_1DomainMappingsClient-retry-snippet)\n- [2.28.0](/cpp/docs/reference/appengine/2.28.0/appengine_v1_1_1DomainMappingsClient-retry-snippet)\n- [2.27.0](/cpp/docs/reference/appengine/2.27.0/appengine_v1_1_1DomainMappingsClient-retry-snippet)\n- [2.26.0](/cpp/docs/reference/appengine/2.26.0/appengine_v1_1_1DomainMappingsClient-retry-snippet)\n- [2.25.1](/cpp/docs/reference/appengine/2.25.1/appengine_v1_1_1DomainMappingsClient-retry-snippet)\n- [2.24.0](/cpp/docs/reference/appengine/2.24.0/appengine_v1_1_1DomainMappingsClient-retry-snippet)\n- [2.23.0](/cpp/docs/reference/appengine/2.23.0/appengine_v1_1_1DomainMappingsClient-retry-snippet)\n- [2.22.1](/cpp/docs/reference/appengine/2.22.1/appengine_v1_1_1DomainMappingsClient-retry-snippet)\n- [2.21.0](/cpp/docs/reference/appengine/2.21.0/appengine_v1_1_1DomainMappingsClient-retry-snippet)\n- [2.20.0](/cpp/docs/reference/appengine/2.20.0/appengine_v1_1_1DomainMappingsClient-retry-snippet)\n- [2.19.0](/cpp/docs/reference/appengine/2.19.0/appengine_v1_1_1DomainMappingsClient-retry-snippet)\n- [2.18.0](/cpp/docs/reference/appengine/2.18.0/appengine_v1_1_1DomainMappingsClient-retry-snippet)\n- [2.17.0](/cpp/docs/reference/appengine/2.17.0/appengine_v1_1_1DomainMappingsClient-retry-snippet)\n- [2.16.0](/cpp/docs/reference/appengine/2.16.0/appengine_v1_1_1DomainMappingsClient-retry-snippet)\n- [2.15.1](/cpp/docs/reference/appengine/2.15.1/appengine_v1_1_1DomainMappingsClient-retry-snippet)\n- [2.14.0](/cpp/docs/reference/appengine/2.14.0/appengine_v1_1_1DomainMappingsClient-retry-snippet)\n- [2.13.0](/cpp/docs/reference/appengine/2.13.0/appengine_v1_1_1DomainMappingsClient-retry-snippet)\n- [2.12.0](/cpp/docs/reference/appengine/2.12.0/appengine_v1_1_1DomainMappingsClient-retry-snippet)\n- [2.11.0](/cpp/docs/reference/appengine/2.11.0/appengine_v1_1_1DomainMappingsClient-retry-snippet) \n\nOverride appengine_v1::DomainMappingsClient Retry Policies\n==========================================================\n\nThis shows how to override the retry policies for appengine_v1::DomainMappingsClient: \n\n auto options =\n google::cloud::Options{}\n .set\u003cgoogle::cloud::appengine_v1::\n DomainMappingsConnectionIdempotencyPolicyOption\u003e(\n CustomIdempotencyPolicy().clone())\n .set\u003cgoogle::cloud::appengine_v1::DomainMappingsRetryPolicyOption\u003e(\n google::cloud::appengine_v1::\n DomainMappingsLimitedErrorCountRetryPolicy(3)\n .clone())\n .set\u003cgoogle::cloud::appengine_v1::DomainMappingsBackoffPolicyOption\u003e(\n google::cloud::ExponentialBackoffPolicy(\n /*initial_delay=*/std::chrono::milliseconds(200),\n /*maximum_delay=*/std::chrono::seconds(45),\n /*scaling=*/2.0)\n .clone());\n auto connection =\n google::cloud::appengine_v1::MakeDomainMappingsConnection(options);\n\n // c1 and c2 share the same retry policies\n auto c1 = google::cloud::appengine_v1::DomainMappingsClient(connection);\n auto c2 = google::cloud::appengine_v1::DomainMappingsClient(connection);\n\n // You can override any of the policies in a new client. This new client\n // will share the policies from c1 (or c2) *except* for the retry policy.\n auto c3 = google::cloud::appengine_v1::DomainMappingsClient(\n connection,\n google::cloud::Options{}\n .set\u003cgoogle::cloud::appengine_v1::DomainMappingsRetryPolicyOption\u003e(\n google::cloud::appengine_v1::DomainMappingsLimitedTimeRetryPolicy(\n std::chrono::minutes(5))\n .clone()));\n\n // You can also override the policies in a single call:\n // c3.SomeRpc(..., google::cloud::Options{}\n // .set\u003cgoogle::cloud::appengine_v1::DomainMappingsRetryPolicyOption\u003e(\n // google::cloud::appengine_v1::DomainMappingsLimitedErrorCountRetryPolicy(10).clone()));\n\nAssuming you have created a custom idempotency policy. Such as: \n\n class CustomIdempotencyPolicy : public google::cloud::appengine_v1::\n DomainMappingsConnectionIdempotencyPolicy {\n public:\n ~CustomIdempotencyPolicy() override = default;\n std::unique_ptr\u003c\n google::cloud::appengine_v1::DomainMappingsConnectionIdempotencyPolicy\u003e\n clone() const override {\n return std::make_unique\u003cCustomIdempotencyPolicy\u003e(*this);\n }\n // Override inherited functions to define as needed.\n };"]]