/// <summary>
/// Updates task state for a given taskId based on the task event
/// </summary>
private void UpdateState(string taskId, TaskStateEvent taskEvent)
{
var taskInfo = GetTaskInfo(taskId);
RecordingTime(taskId, taskInfo, taskEvent);
taskInfo.TaskState.MoveNext(taskEvent);
taskInfo.TimeStateUpdated = DateTime.Now;
}
/// <summary>
/// Recording timing from one task state to another
/// The method can be extended to record the time for other task states
/// The log level should be changed to verb once we complete the testing
/// </summary>
private void RecordingTime(string taskId, TaskInfo taskInfo, TaskStateEvent taskEvent)
{
if (taskInfo.TaskState.CurrentState.Equals(TaskState.TaskWaitingForClose) && taskEvent.Equals(TaskStateEvent.CompletedTask))
{
var timeSpan = DateTime.Now - taskInfo.TimeStateUpdated;
_totalNumberOfClosedTasksByDriver++;
_totalTaskClosingTimeSpan = _totalTaskClosingTimeSpan.Add(timeSpan);
Logger.Log(Level.Info, "RecordClosingTime for task id {0}, closing time: {1}, average closing time: {2}.", taskId, timeSpan.Milliseconds, _totalTaskClosingTimeSpan.Milliseconds / _totalNumberOfClosedTasksByDriver);
}
}
/// <summary>
/// Get next valid state based on the current state and event given without changing the current state
/// If there is no valid next state, TaskStateTransitionException will be thrown.
/// </summary>
/// <param name="taskEvent"></param>
/// <returns></returns>
internal TaskState GetNext(TaskStateEvent taskEvent)
{
StateTransition <TaskState, TaskStateEvent> transition = new StateTransition <TaskState, TaskStateEvent>(_currentState, taskEvent);
TaskState nextState;
if (!Transitions.TryGetValue(transition, out nextState))
{
throw new TaskStateTransitionException(_currentState, taskEvent);
}
return(nextState);
}
/// <summary>
/// Move to the next state
/// If it is not able to move to the next valid state for a given event, TaskStateTransitionException will be thrown.
/// </summary>
/// <param name="taskEvent"></param>
/// <returns></returns>
internal TaskState MoveNext(TaskStateEvent taskEvent)
{
_currentState = GetNext(taskEvent);
return(_currentState);
}
/// <summary>
/// Updates task state for a given taskId based on the task event
/// </summary>
/// <param name="taskId"></param>
/// <param name="taskEvent"></param>
private void UpdateState(string taskId, TaskStateEvent taskEvent)
{
GetTaskInfo(taskId).TaskState.MoveNext(taskEvent);
}
/// <summary>
/// Exception when error happens in task state transition
/// </summary>
/// <param name="taskState"></param>
/// <param name="taskEvent"></param>
internal TaskStateTransitionException(TaskState taskState, TaskStateEvent taskEvent)
: base(ExceptionMessage(taskState, taskEvent))
{
}
/// <summary>
/// Format a message
/// </summary>
/// <param name="taskState"></param>
/// <param name="taskEvent"></param>
/// <returns></returns>
private static string ExceptionMessage(TaskState taskState, TaskStateEvent taskEvent)
{
return(string.Format(CultureInfo.InvariantCulture, "Unexpected event {0} in state {1}.", taskEvent, taskState));
}
/// <summary>
/// Move to the next state
/// If it is not able to move to the next valid state for a given event, TaskStateTransitionException will be thrown.
/// </summary>
/// <param name="taskEvent"></param>
/// <returns></returns>
internal TaskState MoveNext(TaskStateEvent taskEvent)
{
_currentState = GetNext(taskEvent);
return _currentState;
}
/// <summary>
/// Get next valid state based on the current state and event given without changing the current state
/// If there is no valid next state, TaskStateTransitionException will be thrown.
/// </summary>
/// <param name="taskEvent"></param>
/// <returns></returns>
internal TaskState GetNext(TaskStateEvent taskEvent)
{
StateTransition<TaskState, TaskStateEvent> transition = new StateTransition<TaskState, TaskStateEvent>(_currentState, taskEvent);
TaskState nextState;
if (!Transitions.TryGetValue(transition, out nextState))
{
throw new TaskStateTransitionException(_currentState, taskEvent);
}
return nextState;
}
/// <summary>
/// Updates task state for a given taskId based on the task event
/// </summary>
/// <param name="taskId"></param>
/// <param name="taskEvent"></param>
private void UpdateState(string taskId, TaskStateEvent taskEvent)
{
GetTaskInfo(taskId).TaskState.MoveNext(taskEvent);
}
/// <summary>
/// Format a message
/// </summary>
/// <param name="taskState"></param>
/// <param name="taskEvent"></param>
/// <returns></returns>
private static string ExceptionMessage(TaskState taskState, TaskStateEvent taskEvent)
{
return string.Format(CultureInfo.InvariantCulture, "Unexpected event {0} in state {1}.", taskEvent, taskState);
}
/// <summary>
/// Exception when error happens in task state transition
/// </summary>
/// <param name="taskState"></param>
/// <param name="taskEvent"></param>
internal TaskStateTransitionException(TaskState taskState, TaskStateEvent taskEvent)
: base(ExceptionMessage(taskState, taskEvent))
{
}
