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SessionedSignal.java
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SessionedSignal.java
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/*
* Copyright (c) 2020 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.gateway.streaming.actors;
import java.util.Optional;
import java.util.concurrent.CompletableFuture;
import java.util.concurrent.CompletionStage;
import javax.annotation.Nullable;
import javax.annotation.concurrent.Immutable;
import org.eclipse.ditto.json.JsonField;
import org.eclipse.ditto.json.JsonObject;
import org.eclipse.ditto.model.base.entity.id.EntityId;
import org.eclipse.ditto.model.base.exceptions.SignalEnrichmentFailedException;
import org.eclipse.ditto.model.base.headers.DittoHeaders;
import org.eclipse.ditto.model.base.json.Jsonifiable;
import org.eclipse.ditto.model.things.ThingFieldSelector;
import org.eclipse.ditto.model.things.ThingId;
import org.eclipse.ditto.services.models.signalenrichment.SignalEnrichmentFacade;
import org.eclipse.ditto.signals.base.Signal;
/**
* Sessioned Jsonifiable that supports signal enrichment.
*/
@Immutable
final class SessionedSignal implements SessionedJsonifiable {
private final Signal<?> signal;
private final DittoHeaders sessionHeaders;
private final StreamingSession session;
SessionedSignal(final Signal<?> signal, final DittoHeaders sessionHeaders, final StreamingSession session) {
this.signal = signal;
this.sessionHeaders = sessionHeaders;
this.session = session;
}
@Override
public Jsonifiable.WithPredicate<JsonObject, JsonField> getJsonifiable() {
return signal;
}
@Override
public DittoHeaders getDittoHeaders() {
return signal.getDittoHeaders();
}
@Override
public CompletionStage<JsonObject> retrieveExtraFields(@Nullable final SignalEnrichmentFacade facade) {
final EntityId entityId = signal.getEntityId();
final Optional<ThingFieldSelector> extraFields = session.getExtraFields();
if (extraFields.isPresent() && (facade == null || !(entityId instanceof ThingId))) {
final CompletableFuture<JsonObject> future = new CompletableFuture<>();
future.completeExceptionally(SignalEnrichmentFailedException.newBuilder()
.dittoHeaders(signal.getDittoHeaders())
.build());
return future;
} else if (extraFields.isPresent()) {
return facade.retrievePartialThing((ThingId) entityId, extraFields.get(), sessionHeaders, signal);
} else {
return CompletableFuture.completedFuture(JsonObject.empty());
}
}
@Override
public Optional<StreamingSession> getSession() {
return Optional.of(session);
}
}