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JdbcReadJournalProvider.scala
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JdbcReadJournalProvider.scala
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package no.nextgentel.oss.akkatools.persistence.jdbcjournal
import java.util.concurrent.TimeUnit
import akka.NotUsed
import akka.actor.{ActorLogging, ExtendedActorSystem, Props}
import akka.cluster.pubsub.DistributedPubSub
import akka.cluster.pubsub.DistributedPubSubMediator.Subscribe
import akka.persistence.PersistentRepr
import akka.persistence.query._
import akka.persistence.query.scaladsl.{ReadJournal => ScalaReadJournal}
import akka.persistence.query.javadsl.{ReadJournal => JavaReadJournal}
import akka.serialization.SerializationExtension
import akka.stream.actor.ActorPublisher
import akka.stream.actor.ActorPublisherMessage.{Cancel, Request}
import akka.stream.javadsl
import akka.stream.scaladsl.Source
import com.typesafe.config.Config
import scala.concurrent.duration.{Duration, FiniteDuration}
class JdbcReadJournalProvider(system: ExtendedActorSystem, config: Config) extends ReadJournalProvider {
lazy val jdbcReadJournal = new JdbcReadJournal(system, config)
lazy val javaJdbcReadJournal = new JavaJdbcReadJournal(system, config)
override def scaladslReadJournal(): ScalaReadJournal = jdbcReadJournal
override def javadslReadJournal(): JavaReadJournal = javaJdbcReadJournal
}
object JdbcReadJournal {
// Corresponds to the config section
val identifier = "akka.persistence.query.jdbc-read-journal"
}
class JavaJdbcReadJournal(system: ExtendedActorSystem, config: Config) extends JavaReadJournal
with akka.persistence.query.javadsl.EventsByPersistenceIdQuery
with akka.persistence.query.javadsl.CurrentEventsByPersistenceIdQuery
with akka.persistence.query.javadsl.EventsByTagQuery
with akka.persistence.query.javadsl.CurrentEventsByTagQuery {
val scalaJdbcReadJournal = new JdbcReadJournal(system, config)
override def eventsByPersistenceId(persistenceId: String, fromSequenceNr: Long, toSequenceNr: Long): javadsl.Source[EventEnvelope, NotUsed] =
scalaJdbcReadJournal.eventsByPersistenceId(persistenceId, fromSequenceNr, toSequenceNr).asJava
override def currentEventsByPersistenceId(persistenceId: String, fromSequenceNr: Long, toSequenceNr: Long): javadsl.Source[EventEnvelope, NotUsed] =
scalaJdbcReadJournal.currentEventsByPersistenceId(persistenceId, fromSequenceNr, toSequenceNr).asJava
override def eventsByTag(tag: String, offset: Offset): javadsl.Source[EventEnvelope, NotUsed] =
scalaJdbcReadJournal.eventsByTag(tag, offset).asJava
override def currentEventsByTag(tag: String, offset: Offset): javadsl.Source[EventEnvelope, NotUsed] =
scalaJdbcReadJournal.currentEventsByTag(tag, offset).asJava
}
class JdbcReadJournal(system: ExtendedActorSystem, val config: Config) extends ScalaReadJournal
with akka.persistence.query.scaladsl.EventsByPersistenceIdQuery
with akka.persistence.query.scaladsl.CurrentEventsByPersistenceIdQuery
with akka.persistence.query.scaladsl.EventsByTagQuery
with akka.persistence.query.scaladsl.CurrentEventsByTagQuery
with JdbcJournalRuntimeDataExtractor {
val persistenceIdParser = runtimeData.persistenceIdParser
val refreshInterval: FiniteDuration = {
val millis = config.getDuration("refresh-interval", TimeUnit.MILLISECONDS)
FiniteDuration(millis, TimeUnit.MILLISECONDS)
}
override def eventsByPersistenceId(persistenceId: String, fromSequenceNr: Long, toSequenceNr: Long): Source[EventEnvelope, NotUsed] = {
val props = Props(new JdbcEventsByPersistenceIdActor(configName, runtimeData, true, refreshInterval, persistenceIdParser.parse(persistenceId), fromSequenceNr, toSequenceNr))
Source.actorPublisher[EventEnvelope](props).mapMaterializedValue(_ ⇒ NotUsed)
}
override def currentEventsByPersistenceId(persistenceId: String, fromSequenceNr: Long, toSequenceNr: Long): Source[EventEnvelope, NotUsed] = {
val props = Props(new JdbcEventsByPersistenceIdActor(configName, runtimeData, false, refreshInterval, persistenceIdParser.parse(persistenceId), fromSequenceNr, toSequenceNr))
Source.actorPublisher[EventEnvelope](props).mapMaterializedValue(_ ⇒ NotUsed)
}
private def parseTag(tagOrTags:String):PersistenceId = {
val tags = tagOrTags.split("""\|""")
if ( tags.size == 1) {
PersistenceIdSingleTagOnly(tags(0))
} else {
PersistenceIdMultipleTags(tags.toList)
}
}
override def eventsByTag(tag: String, offset: Offset): Source[EventEnvelope, NotUsed] = {
val persistenceId = parseTag(tag)
val props = Props(new JdbcEventsByPersistenceIdActor(configName, runtimeData, true, refreshInterval, persistenceId, fromOffsetToSequence(offset), Long.MaxValue))
Source.actorPublisher[EventEnvelope](props).mapMaterializedValue(_ ⇒ NotUsed)
}
override def currentEventsByTag(tag: String, offset: Offset): Source[EventEnvelope, NotUsed] = {
val persistenceId = parseTag(tag)
val props = Props(new JdbcEventsByPersistenceIdActor(configName, runtimeData, false, refreshInterval, persistenceId, fromOffsetToSequence(offset), Long.MaxValue))
Source.actorPublisher[EventEnvelope](props).mapMaterializedValue(_ ⇒ NotUsed)
}
private def fromOffsetToSequence(offset:Offset):Long = {
offset match {
case NoOffset => 0
case Sequence(value) => value
case x => throw new Exception(s"Offset of type ${x.getClass} is not supported")
}
}
}
private case object Continue
class JdbcEventsByPersistenceIdActor(configName:String, runtimeData:JdbcJournalRuntimeData, live:Boolean, refreshInterval: FiniteDuration, persistenceId: PersistenceId, fromSequenceNr: Long, toSequenceNr: Long)
extends ActorPublisher[EventEnvelope] with ActorLogging {
val serializer = SerializationExtension.get(context.system).serializerFor(classOf[PersistentRepr])
private var nextFromSequenceNr = fromSequenceNr
var buf = Vector.empty[EventEnvelope]
import context.dispatcher
val continueTask = context.system.scheduler.schedule( refreshInterval, refreshInterval, self, Continue)
// Start listening for EntryWrittenToTag-messages which is publish each time an event is written for
// a specific tag - maybe the one we're tracking
val pubsubMediator = DistributedPubSub(context.system).mediator
if ( live ) {
val subscriptionTopics:List[String] = persistenceId match {
case p:PersistenceIdSingle =>
List(EntryWrittenToTag.topic(configName, p.tag))
case p:PersistenceIdTagsOnly =>
p.tags.map {
tag =>
EntryWrittenToTag.topic(configName, tag)
}
}
subscriptionTopics.foreach {
subscriptionTopic =>
pubsubMediator ! Subscribe( subscriptionTopic, self)
}
}
override def postStop(): Unit = {
continueTask.cancel()
}
def receive = {
case entryWrittenToTag: EntryWrittenToTag =>
persistenceId match {
case p:PersistenceIdTagsOnly =>
// We're tracking a tags
doWork()
case p:PersistenceIdSingle =>
// we're tracking single id
if( runtimeData.persistenceIdParser.parse(entryWrittenToTag.persistenceId) == persistenceId) {
// This means one of our events have been written
doWork()
}
}
if ( persistenceId.isInstanceOf[PersistenceIdSingleTagOnly] ) {
// We're tracking a tag
doWork()
} else if(entryWrittenToTag.persistenceId == persistenceId) {
// This means one of our events have been written
doWork()
}
case _: Request | Continue ⇒
doWork()
case Cancel ⇒
context.stop(self)
}
def doWork(): Unit = {
query()
deliverBuf()
}
def query(): Unit =
if (buf.isEmpty) {
try {
log.debug(s"Reading entries for persistenceId=$persistenceId - nextFromSequenceNr=$nextFromSequenceNr, toSequenceNr=$toSequenceNr")
val entries: List[JournalEntryDto] = runtimeData.repo.loadJournalEntries(persistenceId, nextFromSequenceNr, toSequenceNr, runtimeData.maxRowsPrRead)
buf = entries.map {
entry: JournalEntryDto =>
val persistentRepr = serializer.fromBinary(entry.persistentRepr).asInstanceOf[PersistentRepr]
nextFromSequenceNr = entry.sequenceNr +1
// TODO: Need to add test for this
val event:AnyRef = persistentRepr.payload match {
case q:EventWithInjectableTimestamp => q.cloneWithInjectedTimestamp(entry.timestamp)
case x:AnyRef => x
}
EventEnvelope(Sequence(entry.sequenceNr), persistentRepr.persistenceId, entry.sequenceNr, event)
}.toVector
if ( !live && buf.isEmpty) {
log.debug(s"Stopping none-live stream for persistenceId=$persistenceId")
onCompleteThenStop()
}
} catch {
case e: Exception ⇒
log.error(e, s"JdbcEventsByPersistenceIdActor stopped for persistenceId=$persistenceId")
onErrorThenStop(e)
}
}
final def deliverBuf(): Unit =
if (totalDemand > 0 && buf.nonEmpty) {
if (totalDemand <= Int.MaxValue) {
val (use, keep) = buf.splitAt(totalDemand.toInt)
buf = keep
use foreach onNext
} else {
buf foreach onNext
buf = Vector.empty
}
}
}