public async Task PolicyRegistry_WithHttpClientFactory()
{
// typically this stuff would go in Startup.ConfigureServices
IServiceCollection services = new ServiceCollection();
services.AddPolicyRegistry(PolicyRegistryFactory.GetPolicyRegistry());
services.AddHttpClient("CustomerService",
client =>
{
client.BaseAddress = new Uri(DemoHelper.DemoBaseUrl);
client.Timeout =
TimeSpan.FromSeconds(
3); // this will apply as an outer timeout to the entire request flow, including waits, retries,etc
})
.AddPolicyHandlerFromRegistry("CustomerServicePolicy");
// typically you would inject http client factory into class via constructor
var serviceProvider = services.BuildServiceProvider();
var clientFactory = serviceProvider.GetService<IHttpClientFactory>();
// create client using factory
var httpClient = clientFactory.CreateClient("CustomerService");
// verify retry on error
var responseMessage = await httpClient.GetStringAsync("api/demo/error?failures=1");
Assert.AreEqual("Success!", responseMessage);
}
public async Task PolicyRegistry_BasicExample()
{
// typically this stuff would go in Startup.ConfigureServices
IServiceCollection services = new ServiceCollection();
services.AddPolicyRegistry(PolicyRegistryFactory.GetPolicyRegistry());
// typically you would inject this into a class via constructor
var serviceProvider = services.BuildServiceProvider();
var registry = serviceProvider.GetService<IReadOnlyPolicyRegistry<string>>();
// customer service contains a retry to this will succeed
var customerServicePolicy = registry.Get<IAsyncPolicy<HttpResponseMessage>>("CustomerServicePolicy");
var response = await customerServicePolicy.ExecuteAsync(ct => DemoHelper.DemoClient.GetAsync("api/demo/error?failures=1", ct),
CancellationToken.None);
var responseMessage = await response.Content.ReadAsStringAsync();
Assert.AreEqual("Success!", responseMessage);
DemoHelper.Reset();
// product service does not contain a retry, so this will fail (return default)
var productServicePolicy = registry.Get<IAsyncPolicy<HttpResponseMessage>>("ProductServicePolicy");
response = await productServicePolicy.ExecuteAsync(
ct => DemoHelper.DemoClient.GetAsync("api/demo/error?failures=1", ct), CancellationToken.None);
responseMessage = await response.Content.ReadAsStringAsync();
Assert.AreEqual("Default!", responseMessage);
}
