ProgressService (common 1.4.2 API)

```
public interface ProgressService
```
simplified version of the ScheduleService meant for one-time tasks

Author:

jutzig.dev@googlemail.com

Method Summary

All Methods Instance Methods Abstract Methods
Modifier and Type	Method	Description
`void`	`cancel(String id)`	attempts to cancel the task with the given id
`Progression`	`progressionOf(String id)`	retrieves a task currently executed with `#schedule(RunnableWithProgress)`
`String`	`schedule(RunnableWithProgress task, String description)`	use this to schedule a one-time task
`void`	`shutdown()`	shuts the scheduler/progress service down.

- Method Detail
  - schedule
```
String schedule(RunnableWithProgress task,
                String description)
```
    use this to schedule a one-time task
    
    Parameters:
    
    task -
    
    Returns:
    
    the id of the task
  - progressionOf
```
Progression progressionOf(String id)
```
    retrieves a task currently executed with #schedule(RunnableWithProgress)
    
    Parameters:
    
    id -
    
    Returns:
    
    the progression of the task
    
    Throws:
    
    RuntimeException - if the progression cannot be obtained
  - cancel
```
void cancel(String id)
```
    attempts to cancel the task with the given id
    
    Parameters:
    
    id -
  - shutdown
```
void shutdown()
```
    shuts the scheduler/progress service down. Tasks will no longer be executed after calling this method. The method is synchronous, so it will wait for the scheduler to be shutdown completely before returning