CODEWITHSUNDEEP
androidandroid-intentandroid-pendingintent
Don Box
Don Box

Reputation: 3336

run an IntentService at most once

I have an IntentService and I want for the startCommand to be called only if it's not already running.

The reason for this is this service is processing all existing rows in database. It can be called to start several times but if it's already running it shouldn't be started again. And similar to IntentService after there are no rows to be processed, it should close itself.

Is this achievable? Maybe with PendingIntent and FLAG_NO_CREATE ?

I could create this with a Service and a separate thread instead of a IntentService but IntentService already has the thread implemented.

Upvotes: 0

Views: 422

Answers (1)

CommonsWare
CommonsWare

Reputation: 1007359

Maybe with PendingIntent and FLAG_NO_CREATE ?

That flag refers to creating the PendingIntent, not the service.

Is this achievable?

Off the cuff:

Step #1: In your service, add an AtomicBoolean field (here called isRunning), initially set to false.

Step #2: Override onStartCommand(). If isRunning is false, set it to true and chain to super.onStartCommand() to inherit normal IntentService behavior. If isRunning is true, do not chain to super.onStartCommand().

Step #3: In onHandleIntent(), wrap all your work in a try/finally block, where you set isRunning to false in finally.

Net: a startService() invocation will only go through normal IntentService processing if onHandleIntent() is not already running.

Upvotes: 1

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