ProcessingTimeServiceFactory (Flink : 2.0-SNAPSHOT API)

Functional Interface:

This is a functional interface and can therefore be used as the assignment target for a lambda expression or method reference.
```
@FunctionalInterface
@Internal
public interface ProcessingTimeServiceFactory
```
A factory for creating processing time services with a given MailboxExecutor. The factory is usually bound to a specific task.

Method Summary

All Methods Instance Methods Abstract Methods
Modifier and Type	Method	Description
`ProcessingTimeService`	`createProcessingTimeService(MailboxExecutor mailboxExecutor)`	Creates a new processing time service with the mailbox executor.

- Method Detail
  - createProcessingTimeService
```
ProcessingTimeService createProcessingTimeService(MailboxExecutor mailboxExecutor)
```
    Creates a new processing time service with the mailbox executor. The mailbox executor is used to defer the ProcessingTimeCallback of the timer registered with the ProcessingTimeService to mailbox for execution.