ServiceWorker: Manipulate uncommitted/purgeable resource ids

content/browser/service_worker/service_worker_database.h

 // Copyright 2014 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 CONTENT_BROWSER_SERVICE_WORKER_SERVICE_WORKER_DATABASE_H_
 #define CONTENT_BROWSER_SERVICE_WORKER_SERVICE_WORKER_DATABASE_H_
 
 #include <set>
 #include <vector>
 
@@ skipping 78 matching lines @@
                          const std::vector<ResourceRecord>& resources);
 
   bool UpdateVersionToActive(int64 registration_id,
                              const GURL& origin);
   bool UpdateLastCheckTime(int64 registration_id,
                            const GURL& origin,
                            const base::Time& time);
   bool DeleteRegistration(int64 registration_id,
                           const GURL& origin);
 
+  // As new resources are put into the diskcache, they go into an uncommitted
+  // list. When a registration is saved that refers to those ids, they're
+  // removed from that list. When a resource no longer has any registrations or
+  // caches referring to it, it's added to the purgeable list. Periodically,
+  // the purgeable list can be purged from the diskcache. At system startup, all
+  // uncommitted ids are moved to the purgeable list.
+
+  // Reads uncommitted resource ids from the database. Returns true on success.
+  // Otherwise clears |ids| and returns false.
+  bool GetUncommittedResourceIds(std::set<int64>* ids);
+
+  // Writes |ids| into the database as uncommitted resources. Returns true on
+  // success. Otherwise writes nothing and returns false.
+  bool WriteUncommittedResourceIds(const std::set<int64>& ids);
+
+  // Deletes uncommitted resource ids specified by |ids| from the database.
+  // Returns true on success. Otherwise deletes nothing and returns false.
+  bool ClearUncommittedResourceIds(const std::set<int64>& ids);
+
+  // Reads purgeable resource ids from the database. Returns true on success.
+  // Otherwise clears |ids| and returns false.
+  bool GetPurgeableResourceIds(std::set<int64>* ids);
+
+  // Writes |ids| into the database as purgeable resources. Returns true on
+  // success. Otherwise writes nothing and returns false.
+  bool WritePurgeableResourceIds(const std::set<int64>& ids);
+
+  // Deletes purgeable resource ids specified by |ids| from the database.
+  // Returns true on success. Otherwise deletes nothing and returns false.
+  bool ClearPurgeableResourceIds(const std::set<int64>& ids);
+
   bool is_disabled() const { return is_disabled_; }
   bool was_corruption_detected() const { return was_corruption_detected_; }
 
  private:
   // Opens the database at the |path_|. This is lazily called when the first
   // database API is called. Returns true if the database was opened. Returns
   // false if the opening failed or was not neccessary, that is, the database
   // does not exist and |create_if_needed| is false.
   bool LazyOpen(bool create_if_needed);
 
   bool ReadNextAvailableId(const char* id_key,
                            int64* next_avail_id);
   bool ReadRegistrationData(int64 registration_id,
                             const GURL& origin,
                             RegistrationData* registration);
+  bool ReadResourceIds(const char* id_key_prefix,
+                       std::set<int64>* ids);
+  bool WriteResourceIds(const char* id_key_prefix,
+                        const std::set<int64>& ids);
+  bool DeleteResourceIds(const char* id_key_prefix,
+                         const std::set<int64>& ids);
   bool ReadDatabaseVersion(int64* db_version);
 
   // Write a batch into the database.
   // NOTE: You must call this when you want to put something into the database
   // because this initializes the database if needed.
   bool WriteBatch(leveldb::WriteBatch* batch);
 
   // Bumps the next available id if |used_id| is greater than or equal to the
   // cached one.
   void BumpNextRegistrationIdIfNeeded(int64 used_id,
@@ skipping 30 matching lines @@
   FRIEND_TEST_ALL_PREFIXES(ServiceWorkerDatabaseTest, OpenDatabase);
   FRIEND_TEST_ALL_PREFIXES(ServiceWorkerDatabaseTest, OpenDatabase_InMemory);
   FRIEND_TEST_ALL_PREFIXES(ServiceWorkerDatabaseTest, GetNextAvailableIds);
 
   DISALLOW_COPY_AND_ASSIGN(ServiceWorkerDatabase);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_SERVICE_WORKER_SERVICE_WORKER_DATABASE_H_