content/browser/storage_partition_impl_map.h

   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_STORAGE_PARTITION_MAP_H_
   6 #define CONTENT_BROWSER_STORAGE_PARTITION_MAP_H_
   7
   8 #include <map>
   9 #include <string>
  10
  11 #include "base/callback_forward.h"
  12 #include "base/containers/hash_tables.h"
  13 #include "base/gtest_prod_util.h"
  14 #include "base/supports_user_data.h"
  15 #include "content/browser/storage_partition_impl.h"
  16 #include "content/public/browser/browser_context.h"
  17
  18 namespace base {
  19 class FilePath;
  20 class SequencedTaskRunner;
  21 }  // namespace base
  22
  23 namespace content {
  24
  25 class BrowserContext;
  26
  27 // A std::string to StoragePartition map for use with SupportsUserData APIs.
  28 class StoragePartitionImplMap : public base::SupportsUserData::Data {
  29  public:
  30   explicit StoragePartitionImplMap(BrowserContext* browser_context);
  31
  32   virtual ~StoragePartitionImplMap();
  33
  34   // This map retains ownership of the returned StoragePartition objects.
  35   StoragePartitionImpl* Get(const std::string& partition_domain,
  36                             const std::string& partition_name,
  37                             bool in_memory);
  38
  39   // Starts an asynchronous best-effort attempt to delete all on-disk storage
  40   // related to |site|, avoiding any directories that are known to be in use.
  41   //
  42   // |on_gc_required| is called if the AsyncObliterate() call was unable to
  43   // fully clean the on-disk storage requiring a call to GarbageCollect() on
  44   // the next browser start.
  45   void AsyncObliterate(const GURL& site, const base::Closure& on_gc_required);
  46
  47   // Examines the on-disk storage and removes any entires that are not listed
  48   // in the |active_paths|, or in use by current entries in the storage
  49   // partition.
  50   //
  51   // The |done| closure is executed on the calling thread when garbage
  52   // collection is complete.
  53   void GarbageCollect(scoped_ptr<base::hash_set<base::FilePath> > active_paths,
  54                       const base::Closure& done);
  55
  56   void ForEach(const BrowserContext::StoragePartitionCallback& callback);
  57
  58  private:
  59   FRIEND_TEST_ALL_PREFIXES(StoragePartitionConfigTest, OperatorLess);
  60
  61   // Each StoragePartition is uniquely identified by which partition domain
  62   // it belongs to (such as an app or the browser itself), the user supplied
  63   // partition name and the bit indicating whether it should be persisted on
  64   // disk or not. This structure contains those elements and is used as
  65   // uniqueness key to lookup StoragePartition objects in the global map.
  66   //
  67   // TODO(nasko): It is equivalent, though not identical to the same structure
  68   // that lives in chrome profiles. The difference is that this one has
  69   // partition_domain and partition_name separate, while the latter one has
  70   // the path produced by combining the two pieces together.
  71   // The fix for http://crbug.com/159193 will remove the chrome version.
  72   struct StoragePartitionConfig {
  73     const std::string partition_domain;
  74     const std::string partition_name;
  75     const bool in_memory;
  76
  77     StoragePartitionConfig(const std::string& domain,
  78                                const std::string& partition,
  79                                const bool& in_memory_only)
  80       : partition_domain(domain),
  81         partition_name(partition),
  82         in_memory(in_memory_only) {}
  83   };
  84
  85   // Functor for operator <.
  86   struct StoragePartitionConfigLess {
  87     bool operator()(const StoragePartitionConfig& lhs,
  88                     const StoragePartitionConfig& rhs) const {
  89       if (lhs.partition_domain != rhs.partition_domain)
  90         return lhs.partition_domain < rhs.partition_domain;
  91       else if (lhs.partition_name != rhs.partition_name)
  92         return lhs.partition_name < rhs.partition_name;
  93       else if (lhs.in_memory != rhs.in_memory)
  94         return lhs.in_memory < rhs.in_memory;
  95       else
  96         return false;
  97     }
  98   };
  99
 100   typedef std::map<StoragePartitionConfig,
 101                    StoragePartitionImpl*,
 102                    StoragePartitionConfigLess>
 103       PartitionMap;
 104
 105   // Returns the relative path from the profile's base directory, to the
 106   // directory that holds all the state for storage contexts in the given
 107   // |partition_domain| and |partition_name|.
 108   static base::FilePath GetStoragePartitionPath(
 109       const std::string& partition_domain,
 110       const std::string& partition_name);
 111
 112   // This must always be called *after* |partition| has been added to the
 113   // partitions_.
 114   //
 115   // TODO(ajwong): Is there a way to make it so that Get()'s implementation
 116   // doesn't need to be aware of this ordering?  Revisit when refactoring
 117   // ResourceContext and AppCache to respect storage partitions.
 118   void PostCreateInitialization(StoragePartitionImpl* partition,
 119                                 bool in_memory);
 120
 121   BrowserContext* browser_context_;  // Not Owned.
 122   scoped_refptr<base::SequencedTaskRunner> file_access_runner_;
 123   PartitionMap partitions_;
 124
 125   // Set to true when the ResourceContext for the associated |browser_context_|
 126   // is initialized. Can never return to false.
 127   bool resource_context_initialized_;
 128 };
 129
 130 }  // namespace content
 131
 132 #endif  // CONTENT_BROWSER_STORAGE_PARTITION_MAP_H_