[Chromoting] The daemon process now starts the networking process and passes the host configuration…

remoting/host/config_file_watcher.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 REMOTING_HOST_DAEMON_CONFIG_WATCHER_H_
+#define REMOTING_HOST_DAEMON_CONFIG_WATCHER_H_
+
+#include "base/basictypes.h"
+#include "base/compiler_specific.h"
+#include "base/file_path.h"
+#include "base/memory/ref_counted.h"
+
+namespace base {
+class SingleThreadTaskRunner;
+}  // namespace base
+
+namespace remoting {
+
+extern const char kHostConfigSwitchName[];
+extern const FilePath::CharType kDefaultHostConfigFile[];
+
+class ConfigFileWatcherImpl;
+
+class ConfigFileWatcher {
+ public:
+  class Delegate {
+   public:
+    virtual ~Delegate();
+
+    // Called once after starting watching the configuration file and every time
+    // the file changes.
+    virtual void OnConfigUpdated(const std::string& config) = 0;
+
+    // Called when the configuration file watcher encountered an error.
+    virtual void OnConfigWatcherError() = 0;
+  };
+
+  // Creates a configuration file watcher that lives at the |io_task_runner|
+  // thread but posts config file updates on on |main_task_runner|.
+  ConfigFileWatcher(
+      scoped_refptr<base::SingleThreadTaskRunner> main_task_runner,
+      scoped_refptr<base::SingleThreadTaskRunner> io_task_runner,
+      Delegate* delegate);
+  virtual ~ConfigFileWatcher();
+
+  // Starts watching |config_path|.
+  void Watch(const FilePath& config_path);
+
+ private:
+  scoped_refptr<ConfigFileWatcherImpl> impl_;
+
+  DISALLOW_COPY_AND_ASSIGN(ConfigFileWatcher);
+};
+
+}  // namespace remoting
+
+#endif  // REMOTING_HOST_DAEMON_CONFIG_WATCHER_H_