Simulate transient error and verify exponential backoff.

chrome/browser/sync/retry_verifier.h

Index: chrome/browser/sync/retry_verifier.h
diff --git a/chrome/browser/sync/retry_verifier.h b/chrome/browser/sync/retry_verifier.h
new file mode 100644
index 0000000000000000000000000000000000000000..930f092ada2f2e876186a4d725f9e395321b5476
--- /dev/null
+++ b/chrome/browser/sync/retry_verifier.h
@@ -0,0 +1,44 @@
+// Copyright (c) 2011 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef CHROME_BROWSER_SYNC_RETRY_VERIFIER_H_
+#define CHROME_BROWSER_SYNC_RETRY_VERIFIER_H_
+#pragma once
+
+

[Raghu Simha, 2011/08/05 18:04:52]

Delete extra blank line.

[lipalani1, 2011/08/05 21:33:57]

Done.

+#include "base/time.h"
+
+

[Raghu Simha, 2011/08/05 18:04:52]

Delete extra blank line.

[lipalani1, 2011/08/05 21:33:57]

Done.

+namespace browser_sync {
+  namespace sessions {

[Raghu Simha, 2011/08/05 18:04:52]

indent -= 2.

[lipalani1, 2011/08/05 21:33:57]

Done.

+    struct SyncSessionSnapshot;

[Raghu Simha, 2011/08/05 18:04:52]

indent -= 4.

[lipalani1, 2011/08/05 21:33:57]

Done.

+  }
+}
+
+// The minimum and maximum wait times for a retry. The actual retry would take
+// place somewhere in this range. The algorithm that calculates the retry wait
+// time uses rand functions.
+struct DelayInfo {
+  int64 min_delay;
+  int64 max_delay;
+};
+
+// Class to verify retries take place using the exponential backoff algorithm.
+class RetryVerifier {
+ public:
+  static const int kMaxRetry = 10;
+  RetryVerifier();
+  ~RetryVerifier();
+  int RetryCount() const { return retry_count_; }
+  void Initialize(const browser_sync::sessions::SyncSessionSnapshot& snap);
+  bool VerifyRetryInterval(
+      const browser_sync::sessions::SyncSessionSnapshot& snap);
+
+ private:
+  int retry_count_;
+  base::Time last_sync_time_;
+  DelayInfo delay_table_[kMaxRetry];

[Raghu Simha, 2011/08/05 18:04:52]

DISALLOW_COPY_AND_ASSIGN(RetryVerifier);

[lipalani1, 2011/08/05 21:33:57]

Done.

+};
+
+#endif  // CHROME_BROWSER_SYNC_RETRY_VERIFIER_H_