DBus changes for implementing local GATT attributes.

device/bluetooth/dbus/bluetooth_gatt_attribute_value_delegate.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 DEVICE_BLUETOOTH_DBUS_BLUETOOTH_GATT_ATTRIBUTE_VALUE_DELEGATE_H_
+#define DEVICE_BLUETOOTH_DBUS_BLUETOOTH_GATT_ATTRIBUTE_VALUE_DELEGATE_H_
+
+#include <cstdint>
+#include <vector>
+
+#include "base/callback_forward.h"
+#include "device/bluetooth/bluetooth_local_gatt_service.h"
+
+namespace bluez {
+
+// A simpler interface for reacting to GATT attribute value requests by the
+// DBus attribute service providers.
+class BluetoothGattAttributeValueDelegate {
+ public:
+  virtual ~BluetoothGattAttributeValueDelegate() {}
+
+  // This method will be called when a remote device requests to read the
+  // value of the exported GATT attribute. Invoke |callback| with a value
+  // to return that value to the requester. Invoke |error_callback| to report
+  // a failure to read the value. This can happen, for example, if the
+  // attribute has no read permission set. Either callback should be
+  // invoked after a reasonable amount of time, since the request will time
+  // out if left pending for too long causing a disconnection.
+  virtual void GetValue(
+      const device::BluetoothLocalGattService::Delegate::ValueCallback&
+          callback,
+      const device::BluetoothLocalGattService::Delegate::ErrorCallback&
+          error_callback) = 0;
+
+  // This method will be called, when a remote device requests to write the
+  // value of the exported GATT attribute. Invoke |callback| to report
+  // that the value was successfully written. Invoke |error_callback| to
+  // report a failure to write the value. This can happen, for example, if the
+  // attribute has no write permission set. Either callback should be
+  // invoked after a reasonable amount of time, since the request will time
+  // out if left pending for too long causing a disconnection.
+  virtual void SetValue(
+      const std::vector<uint8_t>& value,
+      const base::Closure& callback,
+      const device::BluetoothLocalGattService::Delegate::ErrorCallback&
+          error_callback) = 0;
+};
+
+}  // namespace bluez
+
+#endif  // DEVICE_BLUETOOTH_DBUS_BLUETOOTH_GATT_ATTRIBUTE_VALUE_DELEGATE_H_