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DefaultPersistenceStreamingActor.java
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DefaultPersistenceStreamingActor.java
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/*
* Copyright (c) 2017 Contributors to the Eclipse Foundation
*
* See the NOTICE file(s) distributed with this work for additional
* information regarding copyright ownership.
*
* This program and the accompanying materials are made available under the
* terms of the Eclipse Public License 2.0 which is available at
* http://www.eclipse.org/legal/epl-2.0
*
* SPDX-License-Identifier: EPL-2.0
*/
package org.eclipse.ditto.internal.utils.persistence.mongo;
import java.util.function.Function;
import org.eclipse.ditto.internal.models.streaming.EntityIdWithRevision;
import org.eclipse.ditto.internal.utils.persistence.mongo.streaming.MongoReadJournal;
import org.eclipse.ditto.internal.utils.persistence.mongo.streaming.PidWithSeqNr;
import org.eclipse.ditto.utils.jsr305.annotations.AllValuesAreNonnullByDefault;
import org.apache.pekko.actor.Props;
/**
* Configurable default implementation of {@link AbstractPersistenceStreamingActor}.
*/
@AllValuesAreNonnullByDefault
public final class DefaultPersistenceStreamingActor<T extends EntityIdWithRevision<?>>
extends AbstractPersistenceStreamingActor<T> {
private final Class<T> elementClass;
@SuppressWarnings("unused")
private DefaultPersistenceStreamingActor(final Class<T> elementClass,
final Function<PidWithSeqNr, T> entityMapper,
final Function<EntityIdWithRevision<?>, PidWithSeqNr> entityUnmapper) {
super(entityMapper, entityUnmapper);
this.elementClass = elementClass;
}
@SuppressWarnings("unused")
private DefaultPersistenceStreamingActor(final Class<T> elementClass,
final Function<PidWithSeqNr, T> entityMapper,
final Function<EntityIdWithRevision<?>, PidWithSeqNr> entityUnmapper,
final MongoReadJournal readJournal) {
super(entityMapper, entityUnmapper, readJournal);
this.elementClass = elementClass;
}
/**
* Creates Akka configuration object Props for this PersistenceStreamingActor.
*
* @param <T> type of messages to stream.
* @param elementClass class of the elements.
* @param entityMapper the mapper used to map
* {@link org.eclipse.ditto.internal.utils.persistence.mongo.streaming.PidWithSeqNr} to {@code T}.
* The resulting entity will be streamed to the recipient actor.
* @param entityUnmapper the inverse of {@code entityMapper}.
* @return the Akka configuration Props object.
*/
public static <T extends EntityIdWithRevision<?>> Props props(final Class<T> elementClass,
final Function<PidWithSeqNr, T> entityMapper,
final Function<EntityIdWithRevision<?>, PidWithSeqNr> entityUnmapper) {
return Props.create(DefaultPersistenceStreamingActor.class, elementClass, entityMapper, entityUnmapper);
}
static <T extends EntityIdWithRevision<?>> Props propsForTests(final Class<T> elementClass,
final Function<PidWithSeqNr, T> entityMapper,
final Function<EntityIdWithRevision<?>, PidWithSeqNr> entityUnmapper,
final MongoReadJournal readJournal) {
return Props.create(DefaultPersistenceStreamingActor.class, elementClass, entityMapper, entityUnmapper,
readJournal);
}
@Override
protected Class<T> getElementClass() {
return elementClass;
}
}