Port messages sent by WebIDBCursorImpl to Mojo.

content/browser/indexed_db/indexed_db_dispatcher_host.h

 // Copyright (c) 2012 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_INDEXED_DB_INDEXED_DB_DISPATCHER_HOST_H_
 #define CONTENT_BROWSER_INDEXED_DB_INDEXED_DB_DISPATCHER_HOST_H_
 
 #include <stdint.h>
 
 #include <map>
 #include <memory>
 #include <string>
 #include <utility>
 #include <vector>
 
-#include "base/id_map.h"
 #include "base/macros.h"
 #include "base/memory/ref_counted.h"
 #include "content/browser/blob_storage/chrome_blob_storage_context.h"
 #include "content/common/indexed_db/indexed_db.mojom.h"
 #include "content/public/browser/browser_associated_interface.h"
 #include "content/public/browser/browser_message_filter.h"
 #include "net/url_request/url_request_context_getter.h"
 #include "storage/browser/blob/blob_data_handle.h"
 #include "url/gurl.h"
 
 struct IndexedDBHostMsg_DatabaseObserve_Params;
 struct IndexedDBMsg_Observation;
 struct IndexedDBMsg_ObserverChanges;
 
 namespace url {
 class Origin;
 }
 
 namespace content {
 class IndexedDBBlobInfo;
 class IndexedDBCallbacks;
 class IndexedDBConnection;
 class IndexedDBContextImpl;
-class IndexedDBCursor;
 class IndexedDBDatabaseCallbacks;
-class IndexedDBKey;
 class IndexedDBObservation;
 class IndexedDBObserverChanges;
 
 // Handles all IndexedDB related messages from a particular renderer process.
 class IndexedDBDispatcherHost
     : public BrowserMessageFilter,
       public BrowserAssociatedInterface<::indexed_db::mojom::Factory>,
       public ::indexed_db::mojom::Factory {
  public:
   // Only call the constructor from the UI thread.
   IndexedDBDispatcherHost(int ipc_process_id,
                           net::URLRequestContextGetter* request_context_getter,
                           IndexedDBContextImpl* indexed_db_context,
                           ChromeBlobStorageContext* blob_storage_context);
 
   static IndexedDBMsg_ObserverChanges ConvertObserverChanges(
       std::unique_ptr<IndexedDBObserverChanges> changes);
   static IndexedDBMsg_Observation ConvertObservation(
       const IndexedDBObservation* observation);
 
   // BrowserMessageFilter implementation.
   void OnChannelClosing() override;
   void OnDestruct() const override;
-  base::TaskRunner* OverrideTaskRunnerForMessage(
-      const IPC::Message& message) override;
   bool OnMessageReceived(const IPC::Message& message) override;
 
   void FinishTransaction(int64_t host_transaction_id, bool committed);
 
   // A shortcut for accessing our context.
   IndexedDBContextImpl* context() const { return indexed_db_context_.get(); }
   storage::BlobStorageContext* blob_storage_context() const {
     return blob_storage_context_->context();
   }
   int ipc_process_id() const { return ipc_process_id_; }
 
-  // IndexedDBCallbacks call these methods to add the results into the
-  // applicable map.  See below for more details.
-  int32_t Add(IndexedDBCursor* cursor);
-
   bool RegisterTransactionId(int64_t host_transaction_id,
                              const url::Origin& origin);
   bool GetTransactionSize(int64_t host_transaction_id,
                           int64_t* transaction_size);
   void AddToTransaction(int64_t host_transaction_id, int64_t value_length);
 
-  IndexedDBCursor* GetCursorFromId(int32_t ipc_cursor_id);
-
   // These are called to map a 32-bit front-end (renderer-specific) transaction
   // id to and from a back-end ("host") transaction id that encodes the process
   // id in the high 32 bits. The mapping is host-specific and ids are validated.
   int64_t HostTransactionId(int64_t transaction_id);
   int64_t RendererTransactionId(int64_t host_transaction_id);
 
   // These are called to decode a host transaction ID, for diagnostic purposes.
   static uint32_t TransactionIdToRendererTransactionId(
       int64_t host_transaction_id);
   static uint32_t TransactionIdToProcessId(int64_t host_transaction_id);
 
   std::string HoldBlobData(const IndexedDBBlobInfo& blob_info);
   void DropBlobData(const std::string& uuid);
 
   // True if the channel is closing/closed and outstanding requests
   // can be abandoned. Only access on IndexedDB thread.
   bool IsOpen() const;
 
  private:
   // Friends to enable OnDestruct() delegation.
   friend class BrowserThread;
   friend class base::DeleteHelper<IndexedDBDispatcherHost>;
 
   // Used in nested classes.
-  typedef std::map<int64_t, int64_t> TransactionIDToDatabaseIDMap;
   typedef std::map<int64_t, int64_t> TransactionIDToSizeMap;
   typedef std::map<int64_t, url::Origin> TransactionIDToOriginMap;
 
-  // IDMap for RefCounted types
-  template <typename RefCountedType>
-  class RefIDMap {
-   public:
-    typedef int32_t KeyType;
-
-    RefIDMap() {}
-    ~RefIDMap() {}
-
-    KeyType Add(RefCountedType* data) {
-      return map_.Add(new scoped_refptr<RefCountedType>(data));
-    }
-
-    RefCountedType* Lookup(KeyType id) {
-      scoped_refptr<RefCountedType>* ptr = map_.Lookup(id);
-      if (ptr == NULL)
-        return NULL;
-      return ptr->get();
-    }
-
-    void Remove(KeyType id) { map_.Remove(id); }
-
-    void set_check_on_null_data(bool value) {
-      map_.set_check_on_null_data(value);
-    }
-
-   private:
-    IDMap<scoped_refptr<RefCountedType>, IDMapOwnPointer> map_;
-
-    DISALLOW_COPY_AND_ASSIGN(RefIDMap);
-  };
-
-  class CursorDispatcherHost {
-   public:
-    explicit CursorDispatcherHost(IndexedDBDispatcherHost* parent);
-    ~CursorDispatcherHost();
-
-    bool OnMessageReceived(const IPC::Message& message);
-
-    void OnAdvance(int32_t ipc_object_store_id,
-                   int32_t ipc_thread_id,
-                   int32_t ipc_callbacks_id,
-                   uint32_t count);
-    void OnContinue(int32_t ipc_object_store_id,
-                    int32_t ipc_thread_id,
-                    int32_t ipc_callbacks_id,
-                    const IndexedDBKey& key,
-                    const IndexedDBKey& primary_key);
-    void OnPrefetch(int32_t ipc_cursor_id,
-                    int32_t ipc_thread_id,
-                    int32_t ipc_callbacks_id,
-                    int n);
-    void OnPrefetchReset(int32_t ipc_cursor_id,
-                         int used_prefetches,
-                         int unused_prefetches);
-    void OnDestroyed(int32_t ipc_cursor_id);
-
-    IndexedDBDispatcherHost* parent_;
-    RefIDMap<IndexedDBCursor> map_;
-
-   private:
-    DISALLOW_COPY_AND_ASSIGN(CursorDispatcherHost);
-  };
-
   ~IndexedDBDispatcherHost() override;
 
-  // Helper templates.
-  template <class ReturnType>
-  ReturnType* GetOrTerminateProcess(RefIDMap<ReturnType>* map,
-                                    int32_t ipc_return_object_id);
-
-  template <typename MapType>
-  void DestroyObject(MapType* map, int32_t ipc_object_id);
-
   // indexed_db::mojom::Factory implementation:
   void GetDatabaseNames(
       ::indexed_db::mojom::CallbacksAssociatedPtrInfo callbacks_info,
       const url::Origin& origin) override;
   void Open(int32_t worker_thread,
             ::indexed_db::mojom::CallbacksAssociatedPtrInfo callbacks_info,
             ::indexed_db::mojom::DatabaseCallbacksAssociatedPtrInfo
                 database_callbacks_info,
             const url::Origin& origin,
             const base::string16& name,
@@ skipping 10 matching lines @@
       scoped_refptr<IndexedDBCallbacks> callbacks,
       scoped_refptr<IndexedDBDatabaseCallbacks> database_callbacks,
       const url::Origin& origin,
       const base::string16& name,
       int64_t version,
       int64_t transaction_id);
   void DeleteDatabaseOnIDBThread(scoped_refptr<IndexedDBCallbacks> callbacks,
                                  const url::Origin& origin,
                                  const base::string16& name);
 
-  // Message processing. Most of the work is delegated to the dispatcher hosts
-  // below.
-  void OnAckReceivedBlobs(const std::vector<std::string>& uuids);
-
   void ResetDispatcherHosts();
 
   scoped_refptr<net::URLRequestContextGetter> request_context_getter_;
   scoped_refptr<IndexedDBContextImpl> indexed_db_context_;
   scoped_refptr<ChromeBlobStorageContext> blob_storage_context_;
 
   // Maps blob uuid to a pair (handle, ref count). Entry is added and/or count
   // is incremented in HoldBlobData(), and count is decremented and/or entry
   // removed in DropBlobData().
   std::map<std::string,
            std::pair<std::unique_ptr<storage::BlobDataHandle>, int>>
       blob_data_handle_map_;
 
   // Only access on IndexedDB thread.
   bool is_open_ = true;
   TransactionIDToSizeMap transaction_size_map_;
   TransactionIDToOriginMap transaction_origin_map_;
-  std::unique_ptr<CursorDispatcherHost> cursor_dispatcher_host_;
 
   // Used to set file permissions for blob storage.
   int ipc_process_id_;
 
   DISALLOW_IMPLICIT_CONSTRUCTORS(IndexedDBDispatcherHost);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_INDEXED_DB_INDEXED_DB_DISPATCHER_HOST_H_