IssueTracker

Component used:  "android.arch.work:work-runtime:1.0.0-alpha04"
Devices/Android versions reproduced on: Android Emulator api28

I have SyncWorker which I wrap in OneTimeWorkRequest and enqueue by WorkManager but the problem is that this worker is executed only once, no matter how many times I enqueue it.

I create OneTimeWorkRequest.Builder() with common configuration

    private val syncWorkBuilder = OneTimeWorkRequest.Builder(SyncWorker::class.java)
        .setConstraints(Constraints.Builder()
                .setRequiredNetworkType(NetworkType.CONNECTED)
                .build())
        .setBackoffCriteria(BackoffPolicy.EXPONENTIAL, 30, TimeUnit.SECONDS)

Then I reuse it by changing some configuration that might wary between invocations and enqueue

fun sync(triggerImmediate: Boolean = false, syncFromScratch: Boolean = false, delay: Int = 0) {
    val workManager = WorkManager.getInstance()
    if ( workManager == null
            || workManager.getStatusesByTag(SyncWorker.SYNC_FULL_TAG).value
                    ?.find { it.state == State.RUNNING || it.state == State.ENQUEUED } != null) {
        return
    }

    val startDelaySeconds = if (triggerImmediate) 0L else 2L + delay

    val syncWork = syncWorkBuilder
            .addTag(if (syncFromScratch) SyncWorker.SYNC_INITIAL_TAG else SyncWorker.SYNC_FULL_TAG)
            .setInitialDelay(startDelaySeconds, TimeUnit.SECONDS)
            .build()

    Timber.i("Sync work enqueued $syncWork")
    workManager.enqueue(syncWork)
}

It appeared that if I'm not reusing Builder but creating new every time it works fine
I think the problem is in constructor `mId` is crated there and is the same for this instance of builder
    public Builder(@NonNull Class<? extends Worker> workerClass) {
        mId = UUID.randomUUID();
        mWorkSpec = new WorkSpec(mId.toString(), workerClass.getName());
        addTag(workerClass.getName());
    }