Send the list of used and unused resources for precache

components/precache/core/precache_referrer_host_table.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_PRECACHE_CORE_PRECACHE_REFERRER_HOST_TABLE_H_
+#define COMPONENTS_PRECACHE_CORE_PRECACHE_REFERRER_HOST_TABLE_H_
+
+#include <stdint.h>
+
+#include <map>
+#include <string>
+
+#include "base/macros.h"
+#include "base/time/time.h"
+
+namespace sql {
+class Connection;
+}
+
+namespace precache {
+
+struct PrecacheReferrerHostEntry {
+  static const int64_t kInvalidId;
+
+  PrecacheReferrerHostEntry(int64_t id,
+                            const std::string& referrer_host,
+                            int64_t manifest_id,
+                            const base::Time& time)
+      : id(id),
+        referrer_host(referrer_host),
+        manifest_id(manifest_id),
+        time(time) {}
+
+  // Comparison for testing.
+  bool operator==(const PrecacheReferrerHostEntry& entry) const;
+
+  int64_t id;
+  std::string referrer_host;
+  int64_t manifest_id;
+  base::Time time;
+};
+
+class PrecacheReferrerHostTable {
+ public:
+  PrecacheReferrerHostTable();
+  ~PrecacheReferrerHostTable();
+
+  // Initialize the precache referrer host table for use with the specified
+  // database connection. The caller keeps ownership of |db|, and |db| must not
+  // be NULL. Init must be called before any other methods.
+  bool Init(sql::Connection* db);
+
+  // Returns the referrer host information about |referrer_host|.
+  PrecacheReferrerHostEntry GetReferrerHost(const std::string& referrer_host);
+
+  // Updates the referrer host information about |referrer_host|.
+  int64_t UpdateReferrerHost(const std::string& referrer_host,
+                             int64_t manifest_id,
+                             const base::Time& time);
+
+  // Deletes entries that were created before the time of |delete_end|.
+  void DeleteAllEntriesBefore(const base::Time& delete_end);
+
+  // Delete all entries.
+  void DeleteAll();
+
+  // Used by tests to get the contents of the table.
+  std::map<std::string, PrecacheReferrerHostEntry> GetAllDataForTesting();
+
+ private:
+  bool CreateTableIfNonExistent();
+
+  // Not owned by |this|.
+  sql::Connection* db_;
+
+  DISALLOW_COPY_AND_ASSIGN(PrecacheReferrerHostTable);
+};
+
+}  // namespace precache
+
+#endif  // COMPONENTS_PRECACHE_CORE_PRECACHE_REFERRER_HOST_TABLE_H_