/
JsonValueSourceRef.java
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/
JsonValueSourceRef.java
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/*
* Copyright (c) 2021 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.services.utils.cluster;
import java.util.Objects;
import javax.annotation.Nullable;
import javax.annotation.concurrent.Immutable;
import org.eclipse.ditto.json.JsonValue;
import org.eclipse.ditto.model.base.common.ConditionChecker;
import com.fasterxml.jackson.annotation.JsonIgnore;
import com.fasterxml.jackson.annotation.JsonProperty;
import akka.NotUsed;
import akka.stream.SourceRef;
import akka.stream.javadsl.Source;
/**
* Wraps a {@link SourceRef} of {@link JsonValue}s. The purpose of this class is to make working with SourceRef type
* safe. Rationale: Sending a plain SourceRef through the cluster works but it discards the type information, i.e. the
* receiver does not know the actual type of the SourceRef's elements.
* @see <a href="https://doc.akka.io/docs/akka/2.6/stream/stream-refs.html#serialization-of-sourceref-and-sinkref">Akka
* documentation "Serialization of SourceRef and SinkRef"</a>
*/
@Immutable
public final class JsonValueSourceRef implements AkkaJacksonCborSerializable {
private final SourceRef<JsonValue> sourceRef;
private JsonValueSourceRef(@JsonProperty("sourceRef") final SourceRef<JsonValue> sourceRef) {
this.sourceRef = sourceRef;
}
/**
* Returns an instance of {@code JsonValueSourceRef} that wraps the specified SourceRef.
*
* @param sourceRef the SourceRef to be wrapped.
* @return the instance.
* @throws NullPointerException if {@code sourceRef} is {@code null}.
*/
public static JsonValueSourceRef of(final SourceRef<JsonValue> sourceRef) {
return new JsonValueSourceRef(ConditionChecker.checkNotNull(sourceRef, "sourceRef"));
}
/**
* Returns the wrapped SourceRef.
*
* @return the SourceRef.
*/
public SourceRef<JsonValue> getSourceRef() {
return sourceRef;
}
/**
* Returns the Source underlying to the wrapped SourceRef.
*
* @return the Source.
*/
@JsonIgnore
public Source<JsonValue, NotUsed> getSource() {
return sourceRef.getSource();
}
@Override
public boolean equals(@Nullable final Object o) {
if (this == o) {
return true;
}
if (o == null || getClass() != o.getClass()) {
return false;
}
final var that = (JsonValueSourceRef) o;
return sourceRef.equals(that.sourceRef);
}
@Override
public int hashCode() {
return Objects.hash(sourceRef);
}
}