Implementing client policy and controller.

components/offline_pages/offline_page_client_policy.h

+// Copyright 2016 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 COMPONENTS_OFFLINE_PAGES_OFFLINE_PAGE_CLIENT_POLICY_H_
+#define COMPONENTS_OFFLINE_PAGES_OFFLINE_PAGE_CLIENT_POLICY_H_
+
+#include <stdint.h>
+
+#include <string>
+
+#include "base/time/time.h"
+
+namespace offline_pages {
+
+static const int kUnlimitedPages = 0;
+
+// The struct describing the lifetime policy of offline pages.
+// The following behaviors are controlled by policy:
+//    a. Persistency of the offline page.
+//    b. Expiration time of an offline page
+//    c. Limit of number of pages offline.
+struct LifetimePolicy {
+  // Type of the client, indicating where the archived page would be saved
+  // and whether it could be kept indefinitely.
+  enum class LifetimeType {
+    TEMPORARY,
+    PERSISTENT,
+  };
+
+  // Type of the page generated by the client.
+  LifetimeType lifetime_type;
+
+  // The time after which the page expires.
+  base::TimeDelta expiration_period;
+
+  // The maximum number of pages allowed to be saved by the namespace.
+  // kUnlimitedPages (defined above) means no limit set.
+  int page_limit;
+};
+
+// The struct describing policies for various namespaces (Bookmark, Last-N etc.)
+// used by offline page model. The name_space is supposed to be key, so that
+// it's sufficient to compare name_space only when doing comparisons.
+struct OfflinePageClientPolicy {
+  // Namespace to which the policy applied.
+  std::string name_space;
+
+  // Policy to control the lifetime of a page generated by this namespace.
+  LifetimePolicy lifetime_policy;
+};
+
+}  // namespace offline_pages
+
+#endif  // COMPONENTS_OFFLINE_PAGES_OFFLINE_PAGE_CLIENT_POLICY_H_