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Merge pull request #496 from hjubb/job_id_uniqueness

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add in multiple job ID collision handling
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Niels Andriesse 2021-04-09 15:22:59 +10:00 committed by GitHub
commit 82809089c0
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1 changed files with 12 additions and 1 deletions
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libsession/src/main/java/org/session/libsession/messaging/jobs/JobQueue.kt
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@ -6,7 +6,9 @@ import kotlinx.coroutines.channels.Channel.Factory.UNLIMITED
import org.session.libsession.messaging.MessagingConfiguration import org.session.libsession.messaging.MessagingConfiguration
import org.session.libsignal.utilities.logging.Log import org.session.libsignal.utilities.logging.Log
import java.util.* import java.util.*
import java.util.concurrent.ConcurrentHashMap
import java.util.concurrent.Executors import java.util.concurrent.Executors
import java.util.concurrent.atomic.AtomicInteger
import kotlin.concurrent.schedule import kotlin.concurrent.schedule
import kotlin.math.min import kotlin.math.min
import kotlin.math.pow import kotlin.math.pow
@ -16,6 +18,8 @@ import kotlin.math.roundToLong
class JobQueue : JobDelegate { class JobQueue : JobDelegate {
private var hasResumedPendingJobs = false // Just for debugging private var hasResumedPendingJobs = false // Just for debugging
private val jobTimestampMap = ConcurrentHashMap<Long, AtomicInteger>()
private val dispatcher = Executors.newSingleThreadExecutor().asCoroutineDispatcher() private val dispatcher = Executors.newSingleThreadExecutor().asCoroutineDispatcher()
private val scope = GlobalScope + SupervisorJob() private val scope = GlobalScope + SupervisorJob()
private val queue = Channel<Job>(UNLIMITED) private val queue = Channel<Job>(UNLIMITED)
@ -44,7 +48,14 @@ class JobQueue : JobDelegate {
} }
private fun addWithoutExecuting(job: Job) { private fun addWithoutExecuting(job: Job) {
job.id = System.currentTimeMillis().toString() // When adding multiple jobs in rapid succession, timestamps might not be good enough as a unique ID. To
// deal with this we keep track of the number of jobs with a given timestamp and that to the end of the
// timestamp to make it a unique ID. We can't use a random number because we do still want to keep track
// of the order in which the jobs were added.
val currentTime = System.currentTimeMillis()
jobTimestampMap.putIfAbsent(currentTime, AtomicInteger())
job.id = jobTimestampMap[currentTime]!!.getAndIncrement().toString()
MessagingConfiguration.shared.storage.persistJob(job) MessagingConfiguration.shared.storage.persistJob(job)
} }