!per #18463 Make Persistence Query API explorable
* make the standard queries "single method interfaces" that may be implemented by a query journal plugin * remove hints (major problems with varargs anyway), the hints for standard queries should be given in configuration instead, e.g. refresh-interval
This commit is contained in:
Patrik Nordwall
parent
a45f31cecb
commit
5bd245fbc8
46 changed files with 1487 additions and 948 deletions
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@ -5,7 +5,9 @@
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package docs.persistence;
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import static akka.pattern.Patterns.ask;
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import java.util.HashSet;
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import java.util.Set;
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import java.util.Iterator;
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import com.typesafe.config.Config;
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import akka.actor.*;
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@ -44,48 +46,156 @@ public class PersistenceQueryDocTest {
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final ActorSystem system = ActorSystem.create();
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final ActorMaterializer mat = ActorMaterializer.create(system);
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static
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//#advanced-journal-query-types
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public class RichEvent {
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public final Set<String >tags;
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public final Object payload;
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public RichEvent(Set<String> tags, Object payload) {
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this.tags = tags;
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this.payload = payload;
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}
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}
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//#advanced-journal-query-types
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static
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//#advanced-journal-query-types
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// a plugin can provide:
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public final class QueryMetadata{
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public final boolean deterministicOrder;
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public final boolean infinite;
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public QueryMetadata(boolean deterministicOrder, boolean infinite) {
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this.deterministicOrder = deterministicOrder;
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this.infinite = infinite;
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}
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}
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//#advanced-journal-query-types
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static
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//#my-read-journal
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class MyReadJournal implements ReadJournal {
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private final ExtendedActorSystem system;
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public class MyReadJournalProvider implements ReadJournalProvider {
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private final MyJavadslReadJournal javadslReadJournal;
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public MyReadJournal(ExtendedActorSystem system, Config config) {
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this.system = system;
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public MyReadJournalProvider(ExtendedActorSystem system, Config config) {
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this.javadslReadJournal = new MyJavadslReadJournal(system, config);
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}
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@Override
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public MyScaladslReadJournal scaladslReadJournal() {
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return new MyScaladslReadJournal(javadslReadJournal);
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}
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final FiniteDuration defaultRefreshInterval = FiniteDuration.create(3, TimeUnit.SECONDS);
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@Override
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public MyJavadslReadJournal javadslReadJournal() {
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return this.javadslReadJournal;
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}
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}
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//#my-read-journal
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static
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//#my-read-journal
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public class MyJavadslReadJournal implements
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akka.persistence.query.javadsl.ReadJournal,
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akka.persistence.query.javadsl.EventsByTagQuery,
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akka.persistence.query.javadsl.EventsByPersistenceIdQuery,
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akka.persistence.query.javadsl.AllPersistenceIdsQuery,
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akka.persistence.query.javadsl.CurrentPersistenceIdsQuery {
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private final FiniteDuration refreshInterval;
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@SuppressWarnings("unchecked")
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public <T, M> Source<T, M> query(Query<T, M> q, Hint... hints) {
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if (q instanceof EventsByTag) {
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final EventsByTag eventsByTag = (EventsByTag) q;
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final String tag = eventsByTag.tag();
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long offset = eventsByTag.offset();
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final Props props = MyEventsByTagPublisher.props(tag, offset, refreshInterval(hints));
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return (Source<T, M>) Source.<EventEnvelope>actorPublisher(props)
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.mapMaterializedValue(noMaterializedValue());
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} else {
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// unsuported
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return Source.<T>failed(
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new UnsupportedOperationException(
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"Query " + q + " not supported by " + getClass().getName()))
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.mapMaterializedValue(noMaterializedValue());
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}
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public MyJavadslReadJournal(ExtendedActorSystem system, Config config) {
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refreshInterval =
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FiniteDuration.create(config.getDuration("refresh-interval",
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TimeUnit.MILLISECONDS), TimeUnit.MILLISECONDS);
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}
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private FiniteDuration refreshInterval(Hint[] hints) {
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for (Hint hint : hints)
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if (hint instanceof RefreshInterval)
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return ((RefreshInterval) hint).interval();
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return defaultRefreshInterval;
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@Override
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public Source<EventEnvelope, BoxedUnit> eventsByTag(String tag, long offset) {
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final Props props = MyEventsByTagPublisher.props(tag, offset, refreshInterval);
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return Source.<EventEnvelope>actorPublisher(props).
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mapMaterializedValue(m -> BoxedUnit.UNIT);
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}
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private <I, M> akka.japi.function.Function<I, M> noMaterializedValue() {
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return param -> (M) null;
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@Override
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public Source<EventEnvelope, BoxedUnit> eventsByPersistenceId(String persistenceId,
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long fromSequenceNr, long toSequenceNr) {
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// implement in a similar way as eventsByTag
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throw new UnsupportedOperationException("Not implemented yet");
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}
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@Override
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public Source<String, BoxedUnit> allPersistenceIds() {
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// implement in a similar way as eventsByTag
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throw new UnsupportedOperationException("Not implemented yet");
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}
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@Override
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public Source<String, BoxedUnit> currentPersistenceIds() {
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// implement in a similar way as eventsByTag
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throw new UnsupportedOperationException("Not implemented yet");
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}
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// possibility to add more plugin specific queries
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//#advanced-journal-query-definition
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public Source<RichEvent, QueryMetadata> byTagsWithMeta(Set<String> tags) {
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//#advanced-journal-query-definition
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// implement in a similar way as eventsByTag
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throw new UnsupportedOperationException("Not implemented yet");
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}
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}
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//#my-read-journal
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static
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//#my-read-journal
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public class MyScaladslReadJournal implements
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akka.persistence.query.scaladsl.ReadJournal,
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akka.persistence.query.scaladsl.EventsByTagQuery,
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akka.persistence.query.scaladsl.EventsByPersistenceIdQuery,
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akka.persistence.query.scaladsl.AllPersistenceIdsQuery,
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akka.persistence.query.scaladsl.CurrentPersistenceIdsQuery {
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private final MyJavadslReadJournal javadslReadJournal;
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public MyScaladslReadJournal(MyJavadslReadJournal javadslReadJournal) {
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this.javadslReadJournal = javadslReadJournal;
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}
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@Override
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public akka.stream.scaladsl.Source<EventEnvelope, BoxedUnit> eventsByTag(
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String tag, long offset) {
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return javadslReadJournal.eventsByTag(tag, offset).asScala();
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}
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@Override
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public akka.stream.scaladsl.Source<EventEnvelope, BoxedUnit> eventsByPersistenceId(
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String persistenceId, long fromSequenceNr, long toSequenceNr) {
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return javadslReadJournal.eventsByPersistenceId(persistenceId, fromSequenceNr,
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toSequenceNr).asScala();
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}
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@Override
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public akka.stream.scaladsl.Source<String, BoxedUnit> allPersistenceIds() {
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return javadslReadJournal.allPersistenceIds().asScala();
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}
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@Override
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public akka.stream.scaladsl.Source<String, BoxedUnit> currentPersistenceIds() {
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return javadslReadJournal.currentPersistenceIds().asScala();
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}
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// possibility to add more plugin specific queries
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public akka.stream.scaladsl.Source<RichEvent, QueryMetadata> byTagsWithMeta(
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scala.collection.Set<String> tags) {
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Set<String> jTags = scala.collection.JavaConversions.setAsJavaSet(tags);
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return javadslReadJournal.byTagsWithMeta(jTags).asScala();
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}
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}
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//#my-read-journal
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@ -94,13 +204,13 @@ public class PersistenceQueryDocTest {
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//#basic-usage
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// obtain read journal by plugin id
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final ReadJournal readJournal =
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PersistenceQuery.get(system)
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.getReadJournalFor("akka.persistence.query.noop-read-journal");
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final MyJavadslReadJournal readJournal =
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PersistenceQuery.get(system).getReadJournalFor(MyJavadslReadJournal.class,
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"akka.persistence.query.my-read-journal");
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// issue query to journal
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Source<EventEnvelope, BoxedUnit> source =
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readJournal.query(EventsByPersistenceId.create("user-1337", 0, Long.MAX_VALUE));
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readJournal.eventsByPersistenceId("user-1337", 0, Long.MAX_VALUE);
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// materialize stream, consuming events
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ActorMaterializer mat = ActorMaterializer.create(system);
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@ -109,52 +219,51 @@ public class PersistenceQueryDocTest {
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}
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void demonstrateAllPersistenceIdsLive() {
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final ReadJournal readJournal =
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PersistenceQuery.get(system)
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.getReadJournalFor("akka.persistence.query.noop-read-journal");
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final MyJavadslReadJournal readJournal =
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PersistenceQuery.get(system).getReadJournalFor(MyJavadslReadJournal.class,
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"akka.persistence.query.my-read-journal");
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//#all-persistence-ids-live
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readJournal.query(AllPersistenceIds.getInstance());
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readJournal.allPersistenceIds();
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//#all-persistence-ids-live
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}
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void demonstrateNoRefresh() {
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final ActorSystem system = ActorSystem.create();
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final ReadJournal readJournal =
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PersistenceQuery.get(system)
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.getReadJournalFor("akka.persistence.query.noop-read-journal");
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final MyJavadslReadJournal readJournal =
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PersistenceQuery.get(system).getReadJournalFor(MyJavadslReadJournal.class,
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"akka.persistence.query.my-read-journal");
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//#all-persistence-ids-snap
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readJournal.query(AllPersistenceIds.getInstance(), NoRefresh.getInstance());
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readJournal.currentPersistenceIds();
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//#all-persistence-ids-snap
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}
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void demonstrateRefresh() {
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final ActorSystem system = ActorSystem.create();
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final ReadJournal readJournal =
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PersistenceQuery.get(system)
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.getReadJournalFor("akka.persistence.query.noop-read-journal");
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final MyJavadslReadJournal readJournal =
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PersistenceQuery.get(system).getReadJournalFor(MyJavadslReadJournal.class,
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"akka.persistence.query.my-read-journal");
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//#events-by-persistent-id-refresh
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final RefreshInterval refresh = RefreshInterval.create(1, TimeUnit.SECONDS);
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readJournal.query(EventsByPersistenceId.create("user-us-1337"), refresh);
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//#events-by-persistent-id-refresh
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//#events-by-persistent-id
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readJournal.eventsByPersistenceId("user-us-1337", 0L, Long.MAX_VALUE);
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//#events-by-persistent-id
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}
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void demonstrateEventsByTag() {
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final ActorSystem system = ActorSystem.create();
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final ActorMaterializer mat = ActorMaterializer.create(system);
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final ReadJournal readJournal =
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PersistenceQuery.get(system)
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.getReadJournalFor("akka.persistence.query.noop-read-journal");
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final MyJavadslReadJournal readJournal =
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PersistenceQuery.get(system).getReadJournalFor(MyJavadslReadJournal.class,
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"akka.persistence.query.my-read-journal");
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//#events-by-tag
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// assuming journal is able to work with numeric offsets we can:
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final Source<EventEnvelope, BoxedUnit> blueThings =
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readJournal.query(EventsByTag.create("blue"));
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readJournal.eventsByTag("blue", 0L);
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// find top 10 blue things:
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final Future<List<Object>> top10BlueThings =
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@ -167,56 +276,39 @@ public class PersistenceQueryDocTest {
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}, mat);
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// start another query, from the known offset
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Source<EventEnvelope, BoxedUnit> blue = readJournal.query(EventsByTag.create("blue", 10));
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Source<EventEnvelope, BoxedUnit> blue = readJournal.eventsByTag("blue", 10);
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//#events-by-tag
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}
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//#materialized-query-metadata-classes
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// a plugin can provide:
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//#materialized-query-metadata-classes
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static
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//#materialized-query-metadata-classes
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final class QueryMetadata {
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public final boolean deterministicOrder;
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public final boolean infinite;
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public QueryMetadata(Boolean deterministicOrder, Boolean infinite) {
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this.deterministicOrder = deterministicOrder;
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this.infinite = infinite;
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}
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}
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//#materialized-query-metadata-classes
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static
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//#materialized-query-metadata-classes
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final class AllEvents implements Query<Object, QueryMetadata> {
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private AllEvents() {}
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private static AllEvents INSTANCE = new AllEvents();
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}
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//#materialized-query-metadata-classes
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void demonstrateMaterializedQueryValues() {
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final ActorSystem system = ActorSystem.create();
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final ActorMaterializer mat = ActorMaterializer.create(system);
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final ReadJournal readJournal =
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PersistenceQuery.get(system)
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.getReadJournalFor("akka.persistence.query.noop-read-journal");
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final MyJavadslReadJournal readJournal =
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PersistenceQuery.get(system).getReadJournalFor(MyJavadslReadJournal.class,
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"akka.persistence.query.my-read-journal");
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//#materialized-query-metadata
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//#advanced-journal-query-usage
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final Source<Object, QueryMetadata> events = readJournal.query(AllEvents.INSTANCE);
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events.mapMaterializedValue(meta -> {
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System.out.println("The query is: " +
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"ordered deterministically: " + meta.deterministicOrder + " " +
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"infinite: " + meta.infinite);
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return meta;
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});
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//#materialized-query-metadata
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Set<String> tags = new HashSet<String>();
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tags.add("red");
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tags.add("blue");
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final Source<RichEvent, QueryMetadata> events = readJournal.byTagsWithMeta(tags)
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.mapMaterializedValue(meta -> {
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System.out.println("The query is: " +
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"ordered deterministically: " + meta.deterministicOrder + " " +
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"infinite: " + meta.infinite);
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return meta;
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});
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events.map(event -> {
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System.out.println("Event payload: " + event.payload);
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return event.payload;
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}).runWith(Sink.ignore(), mat);
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//#advanced-journal-query-usage
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}
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class ReactiveStreamsCompatibleDBDriver {
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@ -229,9 +321,9 @@ public class PersistenceQueryDocTest {
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final ActorSystem system = ActorSystem.create();
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final ActorMaterializer mat = ActorMaterializer.create(system);
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final ReadJournal readJournal =
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PersistenceQuery.get(system)
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.getReadJournalFor("akka.persistence.query.noop-read-journal");
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final MyJavadslReadJournal readJournal =
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PersistenceQuery.get(system).getReadJournalFor(MyJavadslReadJournal.class,
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"akka.persistence.query.my-read-journal");
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//#projection-into-different-store-rs
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@ -240,7 +332,7 @@ public class PersistenceQueryDocTest {
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// Using an example (Reactive Streams) Database driver
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readJournal
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.query(EventsByPersistenceId.create("user-1337"))
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.eventsByPersistenceId("user-1337", 0L, Long.MAX_VALUE)
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.map(envelope -> envelope.event())
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.grouped(20) // batch inserts into groups of 20
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.runWith(Sink.create(dbBatchWriter), mat); // write batches to read-side database
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@ -262,16 +354,16 @@ public class PersistenceQueryDocTest {
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final ActorSystem system = ActorSystem.create();
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final ActorMaterializer mat = ActorMaterializer.create(system);
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final ReadJournal readJournal =
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PersistenceQuery.get(system)
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.getReadJournalFor("akka.persistence.query.noop-read-journal");
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final MyJavadslReadJournal readJournal =
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PersistenceQuery.get(system).getReadJournalFor(MyJavadslReadJournal.class,
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"akka.persistence.query.my-read-journal");
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//#projection-into-different-store-simple
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final ExampleStore store = new ExampleStore();
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readJournal
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.query(EventsByTag.create("bid"))
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.eventsByTag("bid", 0L)
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.mapAsync(1, store::save)
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.runWith(Sink.ignore(), mat);
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//#projection-into-different-store-simple
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@ -305,9 +397,9 @@ public class PersistenceQueryDocTest {
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final ActorSystem system = ActorSystem.create();
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final ActorMaterializer mat = ActorMaterializer.create(system);
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final ReadJournal readJournal =
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PersistenceQuery.get(system)
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.getReadJournalFor("akka.persistence.query.noop-read-journal");
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final MyJavadslReadJournal readJournal =
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PersistenceQuery.get(system).getReadJournalFor(MyJavadslReadJournal.class,
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"akka.persistence.query.my-read-journal");
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//#projection-into-different-store-actor-run
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@ -321,7 +413,7 @@ public class PersistenceQueryDocTest {
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long startFromOffset = Await.result(bidProjection.latestOffset(), timeout.duration());
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readJournal
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.query(EventsByTag.create("bid", startFromOffset))
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.eventsByTag("bid", startFromOffset)
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.<Long>mapAsync(8, envelope -> {
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final Future<Object> f = ask(writer, envelope.event(), timeout);
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return f.<Long>map(new Mapper<Object, Long>() {
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@ -10,15 +10,10 @@ import scala.runtime.BoxedUnit;
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import akka.actor.ActorSystem;
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import akka.persistence.journal.WriteEventAdapter;
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import akka.persistence.journal.EventSeq;
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import akka.persistence.journal.Tagged;
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import akka.persistence.query.AllPersistenceIds;
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import akka.persistence.query.EventEnvelope;
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import akka.persistence.query.EventsByPersistenceId;
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import akka.persistence.query.EventsByTag;
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import akka.persistence.query.PersistenceQuery;
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import akka.persistence.query.javadsl.ReadJournal;
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import akka.persistence.query.journal.leveldb.LeveldbReadJournal;
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import akka.persistence.query.journal.leveldb.javadsl.LeveldbReadJournal;
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import akka.stream.ActorMaterializer;
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import akka.stream.javadsl.Source;
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@ -30,38 +25,41 @@ public class LeveldbPersistenceQueryDocTest {
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//#get-read-journal
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final ActorMaterializer mat = ActorMaterializer.create(system);
|
||||
|
||||
ReadJournal queries =
|
||||
PersistenceQuery.get(system).getReadJournalFor(LeveldbReadJournal.Identifier());
|
||||
LeveldbReadJournal queries =
|
||||
PersistenceQuery.get(system).getReadJournalFor(LeveldbReadJournal.class,
|
||||
LeveldbReadJournal.Identifier());
|
||||
//#get-read-journal
|
||||
}
|
||||
|
||||
public void demonstrateEventsByPersistenceId() {
|
||||
//#EventsByPersistenceId
|
||||
ReadJournal queries =
|
||||
PersistenceQuery.get(system).getReadJournalFor(LeveldbReadJournal.Identifier());
|
||||
LeveldbReadJournal queries =
|
||||
PersistenceQuery.get(system).getReadJournalFor(LeveldbReadJournal.class,
|
||||
LeveldbReadJournal.Identifier());
|
||||
|
||||
Source<EventEnvelope, BoxedUnit> source =
|
||||
queries.query(EventsByPersistenceId.create("some-persistence-id", 0, Long.MAX_VALUE));
|
||||
queries.eventsByPersistenceId("some-persistence-id", 0, Long.MAX_VALUE);
|
||||
//#EventsByPersistenceId
|
||||
}
|
||||
|
||||
public void demonstrateAllPersistenceIds() {
|
||||
//#AllPersistenceIds
|
||||
ReadJournal queries =
|
||||
PersistenceQuery.get(system).getReadJournalFor(LeveldbReadJournal.Identifier());
|
||||
LeveldbReadJournal queries =
|
||||
PersistenceQuery.get(system).getReadJournalFor(LeveldbReadJournal.class,
|
||||
LeveldbReadJournal.Identifier());
|
||||
|
||||
Source<String, BoxedUnit> source =
|
||||
queries.query(AllPersistenceIds.getInstance());
|
||||
Source<String, BoxedUnit> source = queries.allPersistenceIds();
|
||||
//#AllPersistenceIds
|
||||
}
|
||||
|
||||
public void demonstrateEventsByTag() {
|
||||
//#EventsByTag
|
||||
ReadJournal queries =
|
||||
PersistenceQuery.get(system).getReadJournalFor(LeveldbReadJournal.Identifier());
|
||||
LeveldbReadJournal queries =
|
||||
PersistenceQuery.get(system).getReadJournalFor(LeveldbReadJournal.class,
|
||||
LeveldbReadJournal.Identifier());
|
||||
|
||||
Source<EventEnvelope, BoxedUnit> source =
|
||||
queries.query(EventsByTag.create("green", 0));
|
||||
queries.eventsByTag("green", 0);
|
||||
//#EventsByTag
|
||||
}
|
||||
|
||||
|
|
|
|||
Loading…
Add table
Add a link
Reference in a new issue