| // Licensed to the Apache Software Foundation (ASF) under one |
| // or more contributor license agreements. See the NOTICE file |
| // distributed with this work for additional information |
| // regarding copyright ownership. The ASF licenses this file |
| // to you under the Apache License, Version 2.0 (the |
| // "License"); you may not use this file except in compliance |
| // with the License. You may obtain a copy of the License at |
| // |
| // http://www.apache.org/licenses/LICENSE-2.0 |
| // |
| // Unless required by applicable law or agreed to in writing, |
| // software distributed under the License is distributed on an |
| // "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY |
| // KIND, either express or implied. See the License for the |
| // specific language governing permissions and limitations |
| // under the License. |
| |
| using System; |
| using System.Net.Http; |
| using System.Threading; |
| using System.Threading.Tasks; |
| using Microsoft.Practices.TransientFaultHandling; |
| |
| namespace Org.Apache.REEF.Client.YARN.RestClient |
| { |
| /// <summary> |
| /// DelegatingHandler for retrying requests with HTTP client |
| /// </summary> |
| internal class HttpClientRetryHandler : DelegatingHandler |
| { |
| private const int RetryCount = 3; |
| private static readonly TimeSpan MinBackoffTimeSpan = TimeSpan.FromMilliseconds(100); |
| private static readonly TimeSpan MaxBackoffTimeSpan = TimeSpan.FromSeconds(5); |
| private static readonly TimeSpan DeltaBackoffTimeSpan = TimeSpan.FromMilliseconds(500); |
| |
| private readonly RetryPolicy<AllErrorsTransientStrategy> _retryPolicy; |
| |
| public HttpClientRetryHandler(HttpMessageHandler innerHandler) |
| : base(innerHandler) |
| { |
| this._retryPolicy = new RetryPolicy<AllErrorsTransientStrategy>( |
| new ExponentialBackoff( |
| "YarnRESTRetryHandler", |
| RetryCount, |
| MinBackoffTimeSpan, |
| MaxBackoffTimeSpan, |
| DeltaBackoffTimeSpan, |
| firstFastRetry: true)); |
| } |
| |
| protected override async Task<HttpResponseMessage> SendAsync( |
| HttpRequestMessage request, |
| CancellationToken cancellationToken) |
| { |
| return await this._retryPolicy.ExecuteAsync( |
| async () => await base.SendAsync(request, cancellationToken), |
| cancellationToken); |
| } |
| } |
| |
| internal class AllErrorsTransientStrategy : ITransientErrorDetectionStrategy |
| { |
| public bool IsTransient(Exception ex) |
| { |
| return true; |
| } |
| } |
| } |