|
|
@@ -0,0 +1,72 @@
|
|
|
+//
|
|
|
+// RetryStrategy.swift
|
|
|
+// Kingfisher
|
|
|
+//
|
|
|
+// Created by onevcat on 2020/05/04.
|
|
|
+//
|
|
|
+// Copyright (c) 2020 Wei Wang <onevcat@gmail.com>
|
|
|
+//
|
|
|
+// Permission is hereby granted, free of charge, to any person obtaining a copy
|
|
|
+// of this software and associated documentation files (the "Software"), to deal
|
|
|
+// in the Software without restriction, including without limitation the rights
|
|
|
+// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
|
|
|
+// copies of the Software, and to permit persons to whom the Software is
|
|
|
+// furnished to do so, subject to the following conditions:
|
|
|
+//
|
|
|
+// The above copyright notice and this permission notice shall be included in
|
|
|
+// all copies or substantial portions of the Software.
|
|
|
+//
|
|
|
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
|
|
|
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
|
|
|
+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
|
|
|
+// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
|
|
|
+// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
|
|
|
+// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
|
|
|
+// THE SOFTWARE.
|
|
|
+
|
|
|
+import Foundation
|
|
|
+
|
|
|
+struct RetryContext {
|
|
|
+
|
|
|
+ let source: Source
|
|
|
+
|
|
|
+ let error: KingfisherError
|
|
|
+ let retriedCount: Int
|
|
|
+
|
|
|
+ let userInfo: Any?
|
|
|
+}
|
|
|
+
|
|
|
+enum RetryPolicy {
|
|
|
+ case retry
|
|
|
+ case stop
|
|
|
+}
|
|
|
+
|
|
|
+protocol RetryStrategy {
|
|
|
+ func retry(context: RetryContext, retryHandler: @escaping (RetryPolicy) -> Void)
|
|
|
+}
|
|
|
+
|
|
|
+class SimpleRetryPolicy: RetryStrategy {
|
|
|
+ let maxRetryCount: Int
|
|
|
+ let retryInterval: TimeInterval
|
|
|
+
|
|
|
+ init(maxRetryCount: Int, retryInterval: TimeInterval = 3.0) {
|
|
|
+ self.maxRetryCount = maxRetryCount
|
|
|
+ self.retryInterval = retryInterval
|
|
|
+ }
|
|
|
+
|
|
|
+ func retry(context: RetryContext, retryHandler: @escaping (RetryPolicy) -> Void) {
|
|
|
+ guard context.retriedCount < maxRetryCount else {
|
|
|
+ retryHandler(.stop)
|
|
|
+ return
|
|
|
+ }
|
|
|
+
|
|
|
+ guard !context.error.isTaskCancelled else {
|
|
|
+ retryHandler(.stop)
|
|
|
+ return
|
|
|
+ }
|
|
|
+
|
|
|
+ DispatchQueue.main.asyncAfter(deadline: .now() + self.retryInterval) {
|
|
|
+ retryHandler(.retry)
|
|
|
+ }
|
|
|
+ }
|
|
|
+}
|
onevcat