Unrevert r245135 "Created new Windows LevelDB environment."

third_party/leveldatabase/env_chromium_stdio.h

+// Copyright (c) 2013 The LevelDB Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file. See the AUTHORS file for names of contributors.
+
+#ifndef THIRD_PARTY_LEVELDATABASE_ENV_CHROMIUM_STDIO_H_
+#define THIRD_PARTY_LEVELDATABASE_ENV_CHROMIUM_STDIO_H_
+
+#include "env_chromium.h"
+
+namespace leveldb_env {
+
+class ChromiumWritableFile : public leveldb::WritableFile {
+ public:
+  ChromiumWritableFile(const std::string& fname,
+                       FILE* f,
+                       const UMALogger* uma_logger,
+                       WriteTracker* tracker,
+                       bool make_backup);
+  virtual ~ChromiumWritableFile();
+  virtual leveldb::Status Append(const leveldb::Slice& data);
+  virtual leveldb::Status Close();
+  virtual leveldb::Status Flush();
+  virtual leveldb::Status Sync();
+
+ private:
+  enum Type {
+    kManifest,
+    kTable,
+    kOther
+  };
+  leveldb::Status SyncParent();
+
+  std::string filename_;
+  FILE* file_;
+  const UMALogger* uma_logger_;
+  WriteTracker* tracker_;
+  Type file_type_;
+  std::string parent_dir_;
+  bool make_backup_;
+};
+
+class ChromiumEnvStdio : public ChromiumEnv {
+ public:
+  ChromiumEnvStdio();
+  virtual ~ChromiumEnvStdio();
+
+  virtual leveldb::Status NewSequentialFile(const std::string& fname,
+                                            leveldb::SequentialFile** result);
+  virtual leveldb::Status NewRandomAccessFile(
+      const std::string& fname,
+      leveldb::RandomAccessFile** result);
+  virtual leveldb::Status NewWritableFile(const std::string& fname,
+                                          leveldb::WritableFile** result);
+  virtual leveldb::Status NewLogger(const std::string& fname,
+                                    leveldb::Logger** result);
+
+ protected:
+  virtual base::PlatformFileError GetDirectoryEntries(
+      const base::FilePath& dir_param,
+      std::vector<base::FilePath>* result) const;
+
+ private:
+  // BGThread() is the body of the background thread
+  void BGThread();
+  static void BGThreadWrapper(void* arg) {
+    reinterpret_cast<ChromiumEnvStdio*>(arg)->BGThread();
+  }
+  void RecordOpenFilesLimit(const std::string& type);
+};
+
+}  // namespace leveldb_env
+
+#endif