[CrOS Tether] Create DisconnectTetheringOperation, which sends a DisconnectTetheringRequest to a re…

chromeos/components/tether/disconnect_tethering_operation.h

Index: chromeos/components/tether/disconnect_tethering_operation.h
diff --git a/chromeos/components/tether/disconnect_tethering_operation.h b/chromeos/components/tether/disconnect_tethering_operation.h
new file mode 100644
index 0000000000000000000000000000000000000000..81e1e65e7f4c976d6e554a95f9c0753eac6185b5
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+++ b/chromeos/components/tether/disconnect_tethering_operation.h
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+// Copyright 2017 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 CHROMEOS_COMPONENTS_TETHER_DISCONNECT_TETHERING_OPERATION_H_
+#define CHROMEOS_COMPONENTS_TETHER_DISCONNECT_TETHERING_OPERATION_H_
+
+#include "base/observer_list.h"
+#include "chromeos/components/tether/message_transfer_operation.h"
+
+namespace chromeos {
+
+namespace tether {
+
+class BleConnectionManager;
+
+// Operation which sends a disconnect message to a tether host.
+class DisconnectTetheringOperation : public MessageTransferOperation {
+ public:
+  class Factory {
+   public:
+    static std::unique_ptr<DisconnectTetheringOperation> NewInstance(
+        const cryptauth::RemoteDevice& device_to_connect,
+        BleConnectionManager* connection_manager);
+
+    static void SetInstanceForTesting(Factory* factory);
+
+   protected:
+    virtual std::unique_ptr<DisconnectTetheringOperation> BuildInstance(
+        const cryptauth::RemoteDevice& device_to_connect,
+        BleConnectionManager* connection_manager);
+
+   private:
+    static Factory* factory_instance_;
+  };
+
+  class Observer {
+   public:
+    // Alerts observers when the operation has finished. |success| is true when
+    // the operation successfully sends the message and false otherwise.
+    virtual void OnOperationFinished(bool success) = 0;
+  };
+
+  DisconnectTetheringOperation(const cryptauth::RemoteDevice& device_to_connect,
+                               BleConnectionManager* connection_manager);
+  ~DisconnectTetheringOperation() override;
+
+  void AddObserver(Observer* observer);
+  void RemoveObserver(Observer* observer);
+
+ protected:
+  // MessageTransferOperation:
+  void OnDeviceAuthenticated(
+      const cryptauth::RemoteDevice& remote_device) override;
+  void OnOperationFinished() override;
+  MessageType GetMessageTypeForConnection() override;
+
+ private:
+  friend class DisconnectTetheringOperationTest;
+
+  base::ObserverList<Observer> observer_list_;
+  bool has_authenticated_;
+
+  DISALLOW_COPY_AND_ASSIGN(DisconnectTetheringOperation);
+};
+
+}  // namespace tether
+
+}  // namespace chromeos
+
+#endif  // CHROMEOS_COMPONENTS_TETHER_DISCONNECT_TETHERING_OPERATION_H_