/// <summary>
        /// Creates or updates a role definition.
        /// </summary>
        /// <param name="roleDefinitionDescription">The description for the role definition.</param>
        /// <param name="permissions">The permissions granted by the role definition when assigned to a principal.</param>
        /// <param name="roleScope">The scope of the <see cref="KeyVaultRoleDefinition"/> to create. The default value is <see cref="KeyVaultRoleScope.Global"/>.</param>
        /// <param name="roleDefinitionName">Optional name used to create the role definition. A new <see cref="Guid"/> will be generated if not specified.</param>
        /// <param name="cancellationToken">A <see cref="CancellationToken"/> controlling the request lifetime.</param>
        /// <returns>A <see cref="Response{TResult}"/> containing the result of the operation.</returns>
        public virtual Response <KeyVaultRoleDefinition> CreateOrUpdateRoleDefinition(string roleDefinitionDescription, KeyVaultPermission permissions, KeyVaultRoleScope roleScope = default, Guid?roleDefinitionName = null, CancellationToken cancellationToken = default)
        {
            using DiagnosticScope scope = _diagnostics.CreateScope($"{nameof(KeyVaultAccessControlClient)}.{nameof(CreateOrUpdateRoleDefinition)}");
            scope.Start();
            try
            {
                var name       = (roleDefinitionName ?? Guid.NewGuid()).ToString();
                var properties = new RoleDefinitionProperties()
                {
                    Description = roleDefinitionDescription,
                    RoleName    = name,
                    RoleType    = KeyVaultRoleType.CustomRole
                };
                properties.AssignableScopes.Add(roleScope);
                properties.Permissions.Add(permissions);

                var parameters = new RoleDefinitionCreateParameters(properties);

                return(_definitionsRestClient.CreateOrUpdate(
                           vaultBaseUrl: VaultUri.AbsoluteUri,
                           scope: roleScope == default ? roleScope.ToString() : KeyVaultRoleScope.Global.ToString(),
                           roleDefinitionName: name,
                           parameters: parameters,
                           cancellationToken: cancellationToken));
            }
            catch (Exception ex)
            {
                scope.Failed(ex);
                throw;
            }
        }
        /// <summary>
        /// Get role definition by name (GUID).
        /// </summary>
        /// <param name='roleDefinitionName'>
        /// Required. Role definition name (GUID).
        /// </param>
        /// <param name='cancellationToken'>
        /// Cancellation token.
        /// </param>
        /// <returns>
        /// Role definition get operation result.
        /// </returns>
        public async Task <RoleDefinitionGetResult> GetAsync(Guid roleDefinitionName, CancellationToken cancellationToken)
        {
            // Validate

            // Tracing
            bool   shouldTrace  = CloudContext.Configuration.Tracing.IsEnabled;
            string invocationId = null;

            if (shouldTrace)
            {
                invocationId = Tracing.NextInvocationId.ToString();
                Dictionary <string, object> tracingParameters = new Dictionary <string, object>();
                tracingParameters.Add("roleDefinitionName", roleDefinitionName);
                Tracing.Enter(invocationId, this, "GetAsync", tracingParameters);
            }

            // Construct URL
            string url = "/subscriptions/" + (this.Client.Credentials.SubscriptionId != null ? this.Client.Credentials.SubscriptionId.Trim() : "") + "/providers/Microsoft.Authorization/roleDefinitions/" + roleDefinitionName + "?";

            url = url + "api-version=2014-07-01-preview";
            string baseUrl = this.Client.BaseUri.AbsoluteUri;

            // Trim '/' character from the end of baseUrl and beginning of url.
            if (baseUrl[baseUrl.Length - 1] == '/')
            {
                baseUrl = baseUrl.Substring(0, baseUrl.Length - 1);
            }
            if (url[0] == '/')
            {
                url = url.Substring(1);
            }
            url = baseUrl + "/" + url;
            url = url.Replace(" ", "%20");

            // Create HTTP transport objects
            HttpRequestMessage httpRequest = null;

            try
            {
                httpRequest            = new HttpRequestMessage();
                httpRequest.Method     = HttpMethod.Get;
                httpRequest.RequestUri = new Uri(url);

                // Set Headers
                httpRequest.Headers.Add("x-ms-version", "2014-07-01-preview");

                // Set Credentials
                cancellationToken.ThrowIfCancellationRequested();
                await this.Client.Credentials.ProcessHttpRequestAsync(httpRequest, cancellationToken).ConfigureAwait(false);

                // Send Request
                HttpResponseMessage httpResponse = null;
                try
                {
                    if (shouldTrace)
                    {
                        Tracing.SendRequest(invocationId, httpRequest);
                    }
                    cancellationToken.ThrowIfCancellationRequested();
                    httpResponse = await this.Client.HttpClient.SendAsync(httpRequest, cancellationToken).ConfigureAwait(false);

                    if (shouldTrace)
                    {
                        Tracing.ReceiveResponse(invocationId, httpResponse);
                    }
                    HttpStatusCode statusCode = httpResponse.StatusCode;
                    if (statusCode != HttpStatusCode.OK)
                    {
                        cancellationToken.ThrowIfCancellationRequested();
                        CloudException ex = CloudException.Create(httpRequest, null, httpResponse, await httpResponse.Content.ReadAsStringAsync().ConfigureAwait(false));
                        if (shouldTrace)
                        {
                            Tracing.Error(invocationId, ex);
                        }
                        throw ex;
                    }

                    // Create Result
                    RoleDefinitionGetResult result = null;
                    // Deserialize Response
                    cancellationToken.ThrowIfCancellationRequested();
                    string responseContent = await httpResponse.Content.ReadAsStringAsync().ConfigureAwait(false);

                    result = new RoleDefinitionGetResult();
                    JToken responseDoc = null;
                    if (string.IsNullOrEmpty(responseContent) == false)
                    {
                        responseDoc = JToken.Parse(responseContent);
                    }

                    if (responseDoc != null && responseDoc.Type != JTokenType.Null)
                    {
                        RoleDefinition roleDefinitionInstance = new RoleDefinition();
                        result.RoleDefinition = roleDefinitionInstance;

                        JToken idValue = responseDoc["id"];
                        if (idValue != null && idValue.Type != JTokenType.Null)
                        {
                            string idInstance = ((string)idValue);
                            roleDefinitionInstance.Id = idInstance;
                        }

                        JToken nameValue = responseDoc["name"];
                        if (nameValue != null && nameValue.Type != JTokenType.Null)
                        {
                            Guid nameInstance = Guid.Parse(((string)nameValue));
                            roleDefinitionInstance.Name = nameInstance;
                        }

                        JToken typeValue = responseDoc["type"];
                        if (typeValue != null && typeValue.Type != JTokenType.Null)
                        {
                            string typeInstance = ((string)typeValue);
                            roleDefinitionInstance.Type = typeInstance;
                        }

                        JToken propertiesValue = responseDoc["properties"];
                        if (propertiesValue != null && propertiesValue.Type != JTokenType.Null)
                        {
                            RoleDefinitionProperties propertiesInstance = new RoleDefinitionProperties();
                            roleDefinitionInstance.Properties = propertiesInstance;

                            JToken roleNameValue = propertiesValue["roleName"];
                            if (roleNameValue != null && roleNameValue.Type != JTokenType.Null)
                            {
                                string roleNameInstance = ((string)roleNameValue);
                                propertiesInstance.RoleName = roleNameInstance;
                            }

                            JToken descriptionValue = propertiesValue["description"];
                            if (descriptionValue != null && descriptionValue.Type != JTokenType.Null)
                            {
                                string descriptionInstance = ((string)descriptionValue);
                                propertiesInstance.Description = descriptionInstance;
                            }

                            JToken scopeValue = propertiesValue["scope"];
                            if (scopeValue != null && scopeValue.Type != JTokenType.Null)
                            {
                                string scopeInstance = ((string)scopeValue);
                                propertiesInstance.Scope = scopeInstance;
                            }

                            JToken typeValue2 = propertiesValue["type"];
                            if (typeValue2 != null && typeValue2.Type != JTokenType.Null)
                            {
                                string typeInstance2 = ((string)typeValue2);
                                propertiesInstance.Type = typeInstance2;
                            }

                            JToken permissionsArray = propertiesValue["permissions"];
                            if (permissionsArray != null && permissionsArray.Type != JTokenType.Null)
                            {
                                foreach (JToken permissionsValue in ((JArray)permissionsArray))
                                {
                                    Permission permissionInstance = new Permission();
                                    propertiesInstance.Permissions.Add(permissionInstance);

                                    JToken actionsArray = permissionsValue["actions"];
                                    if (actionsArray != null && actionsArray.Type != JTokenType.Null)
                                    {
                                        foreach (JToken actionsValue in ((JArray)actionsArray))
                                        {
                                            permissionInstance.Actions.Add(((string)actionsValue));
                                        }
                                    }

                                    JToken notActionsArray = permissionsValue["notActions"];
                                    if (notActionsArray != null && notActionsArray.Type != JTokenType.Null)
                                    {
                                        foreach (JToken notActionsValue in ((JArray)notActionsArray))
                                        {
                                            permissionInstance.NotActions.Add(((string)notActionsValue));
                                        }
                                    }
                                }
                            }
                        }
                    }

                    result.StatusCode = statusCode;
                    if (httpResponse.Headers.Contains("x-ms-request-id"))
                    {
                        result.RequestId = httpResponse.Headers.GetValues("x-ms-request-id").FirstOrDefault();
                    }

                    if (shouldTrace)
                    {
                        Tracing.Exit(invocationId, result);
                    }
                    return(result);
                }
                finally
                {
                    if (httpResponse != null)
                    {
                        httpResponse.Dispose();
                    }
                }
            }
            finally
            {
                if (httpRequest != null)
                {
                    httpRequest.Dispose();
                }
            }
        }