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ModifyToCreateConnectionTransformer.java
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ModifyToCreateConnectionTransformer.java
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/*
* Copyright (c) 2023 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.connectivity.service.enforcement.pre;
import java.util.concurrent.CompletableFuture;
import java.util.concurrent.CompletionStage;
import org.apache.pekko.actor.ActorSystem;
import org.eclipse.ditto.base.model.signals.Signal;
import org.eclipse.ditto.base.service.signaltransformer.SignalTransformer;
import org.eclipse.ditto.connectivity.model.signals.commands.modify.CreateConnection;
import org.eclipse.ditto.connectivity.model.signals.commands.modify.ModifyConnection;
import com.typesafe.config.Config;
/**
* Transforms a ModifyConnection into a CreateConnection if the connection does not exist already.
*/
public final class ModifyToCreateConnectionTransformer implements SignalTransformer {
private final ConnectionExistenceChecker existenceChecker;
@SuppressWarnings("unused")
ModifyToCreateConnectionTransformer(final ActorSystem actorSystem, final Config config) {
this(new ConnectionExistenceChecker(actorSystem));
}
ModifyToCreateConnectionTransformer(final ConnectionExistenceChecker existenceChecker) {
this.existenceChecker = existenceChecker;
}
@Override
public CompletionStage<Signal<?>> apply(final Signal<?> signal) {
if (signal instanceof ModifyConnection modifyConnection) {
return existenceChecker.checkExistence(modifyConnection)
.thenApply(exists -> {
if (Boolean.FALSE.equals(exists)) {
return CreateConnection.of(
modifyConnection.getConnection(),
modifyConnection.getDittoHeaders()
);
} else {
return modifyConnection;
}
});
} else {
return CompletableFuture.completedFuture(signal);
}
}
}