Index: Src/GoogleApis/Apis/Http/ExponentialBackOffInitializer.cs
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+/*
+Copyright 2013 Google Inc
+
+Licensed 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.Collections.Generic;
+using System.Linq;
+using System.Text;
+
+namespace Google.Apis.Http
+{
+ ///
+ /// Indicates if exponential back-off is used automatically on exceptions in a service requests and\or when 503
+ /// responses is returned form the server.
+ ///
+ [Flags]
+ public enum ExponentialBackOffPolicy
+ {
+ None = 0,
+ Exception = 1,
+ UnsuccessfulResponse503 = 2
+ }
+
+ ///
+ /// An initializer which adds exponential back-off as exception handler and\or unsuccessful response handler by
+ /// the given .
+ ///
+ public class ExponentialBackOffInitializer : IConfigurableHttpClientInitializer
+ {
+ /// Gets or sets the used back-off policy.
+ private ExponentialBackOffPolicy Policy { get; set; }
+
+ /// Gets or sets the back-off handler creation function.
+ private Func CreateBackOff { get; set; }
+
+ ///
+ /// Constructs a new back-off initializer with the given policy and back-off handler create function.
+ ///
+ public ExponentialBackOffInitializer(ExponentialBackOffPolicy policy, Func createBackOff)
+ {
+ Policy = policy;
+ CreateBackOff = createBackOff;
+ }
+
+ public void Initialize(ConfigurableHttpClient httpClient)
+ {
+ var backOff = CreateBackOff();
+
+ // Add exception handler and\or unsuccessful response handler.
+ if ((Policy & ExponentialBackOffPolicy.Exception) == ExponentialBackOffPolicy.Exception)
+ {
+ httpClient.MessageHandler.ExceptionHandlers.Add(backOff);
+ }
+
+ if ((Policy & ExponentialBackOffPolicy.UnsuccessfulResponse503) ==
+ ExponentialBackOffPolicy.UnsuccessfulResponse503)
+ {
+ httpClient.MessageHandler.UnsuccessfulResponseHandlers.Add(backOff);
+ }
+ }
+ }
+
+}