Job object of collaboration in kotlin

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Job object

• For each collaboration created （ adopt launch perhaps async）, Will return a Job example , This instance is the unique identifier of the coroutine , And manage the lifecycle of the collaboration .
• A task can contain a series of States ： New creation (New)、 active (Active)、 Finishing (Completing)、 Completed (Completed)、 Cancel (Cancelling) And have been cancelled (Cancelled).
  Although we don't have direct access to these States , But we can visit Job Properties of ：isActive、isCancelled and isCompleted.

Job Life cycle of

• If the process is active , The coroutine runs in error or calls job.cancel() Will set the current task to cancel (Cancelling) state (isActive = false,isCancelled = true).
  When all the subprocesses are finished , The program will enter the canceled program (Cancelled) state , here isCompleted = true.