mediaview: Implement FakeFileSystemInstance.

components/arc/test/fake_file_system_instance.h

 // Copyright 2016 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 COMPONENTS_ARC_TEST_FAKE_FILE_SYSTEM_INSTANCE_H_
 #define COMPONENTS_ARC_TEST_FAKE_FILE_SYSTEM_INSTANCE_H_
 
 #include <stdint.h>
 
 #include <map>
+#include <set>
 #include <string>
 #include <utility>
 #include <vector>
 
 #include "base/files/scoped_temp_dir.h"
 #include "base/macros.h"
 #include "base/threading/thread_checker.h"
 #include "components/arc/common/file_system.mojom.h"
 
 namespace arc {
@@ skipping 74 matching lines @@
              const std::string& mime_type,
              int64_t size,
              uint64_t last_modified);
     Document(const Document& that);
     ~Document();
   };
 
   FakeFileSystemInstance();
   ~FakeFileSystemInstance() override;
 
+  // Returns true if Init() has been called.
+  bool InitCalled();
+
   // Adds a file accessible by content URL based methods.
   void AddFile(const File& file);
 
   // Adds a document accessible by document provider based methods.
   void AddDocument(const Document& document);
 
+  // Triggers watchers installed to a document.
+  void TriggerWatchers(const std::string& authority,
+                       const std::string& document_id,
+                       mojom::ChangeType type);
+
   // mojom::FileSystemInstance:
   void AddWatcher(const std::string& authority,
                   const std::string& document_id,
                   const AddWatcherCallback& callback) override;
   void GetChildDocuments(const std::string& authority,
                          const std::string& document_id,
                          const GetChildDocumentsCallback& callback) override;
   void GetDocument(const std::string& authority,
                    const std::string& document_id,
                    const GetDocumentCallback& callback) override;
   void GetFileSize(const std::string& url,
                    const GetFileSizeCallback& callback) override;
   void Init(mojom::FileSystemHostPtr host) override;
   void OpenFileToRead(const std::string& url,
                       const OpenFileToReadCallback& callback) override;
   void RemoveWatcher(int64_t watcher_id,
                      const RemoveWatcherCallback& callback) override;
   void RequestMediaScan(const std::vector<std::string>& paths) override;
 
  private:
   // A pair of an authority and a document ID which identifies the location
   // of a document in documents providers.
   using DocumentKey = std::pair<std::string, std::string>;
 
   base::ThreadChecker thread_checker_;
 
   base::ScopedTempDir temp_dir_;
 
+  mojom::FileSystemHostPtr host_;
+
   // Mapping from a content URL to a file.
   std::map<std::string, File> files_;
 
   // Mapping from a document key to a document.
   std::map<DocumentKey, Document> documents_;
 
   // Mapping from a document key to its child documents.
   std::map<DocumentKey, std::vector<DocumentKey>> child_documents_;
 
+  // Mapping from a document key to its watchers.
+  std::map<DocumentKey, std::set<int64_t>> document_to_watchers_;
+
+  // Mapping from a watcher ID to a document key.
+  std::map<int64_t, DocumentKey> watcher_to_document_;
+
+  int64_t next_watcher_id_ = 1;

[hidehiko, 2017/02/23 11:30:45]

Just curious: any reasons this id starts from 1 rather than 0?

[Shuhei Takahashi, 2017/02/24 06:08:58]

Because 0 is not obvious to me if it indicates failure or success. Using -1 for
failures and positive integers for success sounds clearer to me.

+
   DISALLOW_COPY_AND_ASSIGN(FakeFileSystemInstance);
 };
 
 }  // namespace arc
 
 #endif  // COMPONENTS_ARC_TEST_FAKE_FILE_SYSTEM_INSTANCE_H_