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      1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
      2 // Use of this source code is governed by a BSD-style license that can be
      3 // found in the LICENSE file.
      4 
      5 #ifndef CONTENT_BROWSER_APPCACHE_APPCACHE_QUOTA_CLIENT_H_
      6 #define CONTENT_BROWSER_APPCACHE_APPCACHE_QUOTA_CLIENT_H_
      7 
      8 #include <deque>
      9 #include <map>
     10 #include <string>
     11 
     12 #include "base/gtest_prod_util.h"
     13 #include "base/memory/ref_counted.h"
     14 #include "base/memory/scoped_ptr.h"
     15 #include "content/browser/appcache/appcache_storage.h"
     16 #include "content/common/content_export.h"
     17 #include "net/base/completion_callback.h"
     18 #include "storage/browser/quota/quota_client.h"
     19 #include "storage/browser/quota/quota_task.h"
     20 #include "storage/common/quota/quota_types.h"
     21 
     22 namespace content {
     23 class AppCacheQuotaClientTest;
     24 class AppCacheServiceImpl;
     25 class AppCacheStorageImpl;
     26 
     27 // A QuotaClient implementation to integrate the appcache service
     28 // with the quota management system. The QuotaClient interface is
     29 // used on the IO thread by the quota manager. This class deletes
     30 // itself when both the quota manager and the appcache service have
     31 // been destroyed.
     32 class AppCacheQuotaClient : public storage::QuotaClient {
     33  public:
     34   typedef std::deque<base::Closure> RequestQueue;
     35 
     36   virtual ~AppCacheQuotaClient();
     37 
     38   // QuotaClient method overrides
     39   virtual ID id() const OVERRIDE;
     40   virtual void OnQuotaManagerDestroyed() OVERRIDE;
     41   virtual void GetOriginUsage(const GURL& origin,
     42                               storage::StorageType type,
     43                               const GetUsageCallback& callback) OVERRIDE;
     44   virtual void GetOriginsForType(storage::StorageType type,
     45                                  const GetOriginsCallback& callback) OVERRIDE;
     46   virtual void GetOriginsForHost(storage::StorageType type,
     47                                  const std::string& host,
     48                                  const GetOriginsCallback& callback) OVERRIDE;
     49   virtual void DeleteOriginData(const GURL& origin,
     50                                 storage::StorageType type,
     51                                 const DeletionCallback& callback) OVERRIDE;
     52   virtual bool DoesSupport(storage::StorageType type) const OVERRIDE;
     53 
     54  private:
     55   friend class content::AppCacheQuotaClientTest;
     56   friend class AppCacheServiceImpl;  // for NotifyAppCacheIsDestroyed
     57   friend class AppCacheStorageImpl;  // for NotifyAppCacheIsReady
     58 
     59   CONTENT_EXPORT
     60       explicit AppCacheQuotaClient(AppCacheServiceImpl* service);
     61 
     62   void DidDeleteAppCachesForOrigin(int rv);
     63   void GetOriginsHelper(storage::StorageType type,
     64                         const std::string& opt_host,
     65                         const GetOriginsCallback& callback);
     66   void ProcessPendingRequests();
     67   void DeletePendingRequests();
     68   const AppCacheStorage::UsageMap* GetUsageMap();
     69   net::CancelableCompletionCallback* GetServiceDeleteCallback();
     70 
     71   // For use by appcache internals during initialization and shutdown.
     72   CONTENT_EXPORT void NotifyAppCacheReady();
     73   CONTENT_EXPORT void NotifyAppCacheDestroyed();
     74 
     75   // Prior to appcache service being ready, we have to queue
     76   // up reqeusts and defer acting on them until we're ready.
     77   RequestQueue pending_batch_requests_;
     78   RequestQueue pending_serial_requests_;
     79 
     80   // And once it's ready, we can only handle one delete request at a time,
     81   // so we queue up additional requests while one is in already in progress.
     82   DeletionCallback current_delete_request_callback_;
     83   scoped_ptr<net::CancelableCompletionCallback> service_delete_callback_;
     84 
     85   AppCacheServiceImpl* service_;
     86   bool appcache_is_ready_;
     87   bool quota_manager_is_destroyed_;
     88 
     89   DISALLOW_COPY_AND_ASSIGN(AppCacheQuotaClient);
     90 };
     91 
     92 }  // namespace content
     93 
     94 #endif  // CONTENT_BROWSER_APPCACHE_APPCACHE_QUOTA_CLIENT_H_
     95