ServiceWorker: Migrate the script cache backend from BlockFile to Simple

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 <map>
 #include <set>
 #include <string>
@@ skipping 74 matching lines @@
   };
 
   // Reads next available ids from the database. Returns OK if they are
   // successfully read. Fills the arguments with an initial value and returns
   // OK if they are not found in the database. Otherwise, returns an error.
   Status GetNextAvailableIds(
       int64* next_avail_registration_id,
       int64* next_avail_version_id,
       int64* next_avail_resource_id);
 
+  // Reads the current diskcache version from the database. If the database
+  // hasn't been written anything yet, sets |disk_cache_version| to 0 and
+  // returns OK.
+  Status ReadDiskCacheVersion(int64* disk_cache_version);
+
+  // Writes the current diskcache version into the database.
+  Status WriteDiskCacheVersion(int64 disk_cache_version);
+
   // Reads origins that have one or more than one registration from the
   // database. Returns OK if they are successfully read or not found.
   // Otherwise, returns an error.
   Status GetOriginsWithRegistrations(std::set<GURL>* origins);
 
   // Reads registrations for |origin| from the database. Returns OK if they are
   // successfully read or not found. Otherwise, returns an error.
   Status GetRegistrationsForOrigin(
       const GURL& origin,
       std::vector<RegistrationData>* registrations);
@@ skipping 112 matching lines @@
   Status WritePurgeableResourceIds(const std::set<int64>& ids);
 
   // Deletes purgeable resource ids specified by |ids| from the database.
   // Returns OK on success. Otherwise deletes nothing and returns an error.
   Status ClearPurgeableResourceIds(const std::set<int64>& ids);
 
   // Moves |ids| from the uncommitted list to the purgeable list.
   // Returns OK on success. Otherwise deletes nothing and returns an error.
   Status PurgeUncommittedResourceIds(const std::set<int64>& ids);
 
+  // These *PurgeableFile functions are used for tracking purgeable files placed
+  // under the service worker directory (ie. kServiceWorkerDirectory defined in
+  // ServiceWorkerContextCore). The files should be deletable on the diskcache
+  // thread.
+
+  // Reads filenames of purgeable files from the database. Returns OK on success
+  // even if there are no purgeable files in the database.
+  Status GetPurgeableFiles(std::vector<std::string>* filenames);
+
+  // Writes |filename| into the database as a purgeable file. Returns OK on
+  // success.
+  Status WritePurgeableFile(const std::string& filename);
+
+  // Deletes a purgeable file specified by |filename| from the database. Returns
+  // OK on success.
+  Status ClearPurgeableFile(const std::string& filename);
+
   // Deletes all data for |origins|, namely, unique origin, registrations and
   // resource records. Resources are moved to the purgeable list. Returns OK if
   // they are successfully deleted or not found in the database. Otherwise,
   // returns an error.
   Status DeleteAllDataForOrigins(const std::set<GURL>& origins,
                                  std::vector<int64>* newly_purgeable_resources);
 
   // Completely deletes the contents of the database.
   // Be careful using this function.
   Status DestroyDatabase();
@@ skipping 126 matching lines @@
     INITIALIZED,
     DISABLED,
   };
   State state_;
 
   base::SequenceChecker sequence_checker_;
 
   FRIEND_TEST_ALL_PREFIXES(ServiceWorkerDatabaseTest, OpenDatabase);
   FRIEND_TEST_ALL_PREFIXES(ServiceWorkerDatabaseTest, OpenDatabase_InMemory);
   FRIEND_TEST_ALL_PREFIXES(ServiceWorkerDatabaseTest, DatabaseVersion);
+  FRIEND_TEST_ALL_PREFIXES(ServiceWorkerDatabaseTest, DiskCacheVersion);
   FRIEND_TEST_ALL_PREFIXES(ServiceWorkerDatabaseTest, GetNextAvailableIds);
   FRIEND_TEST_ALL_PREFIXES(ServiceWorkerDatabaseTest,
                            Registration_UninitializedDatabase);
   FRIEND_TEST_ALL_PREFIXES(ServiceWorkerDatabaseTest,
                            UserData_UninitializedDatabase);
   FRIEND_TEST_ALL_PREFIXES(ServiceWorkerDatabaseTest, DestroyDatabase);
   FRIEND_TEST_ALL_PREFIXES(ServiceWorkerDatabaseTest, UpgradeSchemaToVersion2);
 
   DISALLOW_COPY_AND_ASSIGN(ServiceWorkerDatabase);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_SERVICE_WORKER_SERVICE_WORKER_DATABASE_H_