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ConnectivitySignalEnrichmentProvider.java
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ConnectivitySignalEnrichmentProvider.java
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/*
* Copyright (c) 2019 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.mapping;
import static org.eclipse.ditto.base.model.common.ConditionChecker.checkNotNull;
import org.eclipse.ditto.base.service.DittoExtensionIds;
import org.eclipse.ditto.base.service.DittoExtensionPoint;
import org.eclipse.ditto.connectivity.model.ConnectionId;
import org.eclipse.ditto.internal.models.signalenrichment.SignalEnrichmentFacade;
import com.typesafe.config.Config;
import akka.actor.ActorSystem;
/**
* Provider of {@link SignalEnrichmentFacade} to be loaded by reflection.
* Implementations MUST have a public constructor taking the following parameters as arguments:
* <ul>
* <li>ActorSystem actorSystem: actor system in which this provider is loaded,</li>
* <li>ActorRef commandHandler: recipient of retrieve-thing commands,</li>
* <li>Config config: configuration for the facade provider.</li>
* </ul>
*/
public interface ConnectivitySignalEnrichmentProvider extends DittoExtensionPoint {
/**
* Create a signal-enriching facade from the ID of a connection.
*
* @param connectionId the connection ID.
* @return the facade.
*/
SignalEnrichmentFacade getFacade(ConnectionId connectionId);
/**
* Load a {@code ConnectivitySignalEnrichmentProvider} dynamically according to the streaming configuration.
*
* @param actorSystem The actor system in which to load the facade provider class.
* @return The configured facade provider.
*/
static ConnectivitySignalEnrichmentProvider get(final ActorSystem actorSystem, final Config config) {
checkNotNull(actorSystem, "actorSystem");
checkNotNull(config, "config");
final var extensionIdConfig = ExtensionId.computeConfig(config);
return DittoExtensionIds.get(actorSystem)
.computeIfAbsent(extensionIdConfig, ExtensionId::new)
.get(actorSystem);
}
/**
* ID of the actor system extension to provide signal enrichment for connectivity.
*/
final class ExtensionId extends DittoExtensionPoint.ExtensionId<ConnectivitySignalEnrichmentProvider> {
private static final String CONFIG_KEY = "signal-enrichment-provider";
private ExtensionId(final ExtensionIdConfig<ConnectivitySignalEnrichmentProvider> extensionIdConfig) {
super(extensionIdConfig);
}
static ExtensionIdConfig<ConnectivitySignalEnrichmentProvider> computeConfig(final Config config) {
return ExtensionIdConfig.of(ConnectivitySignalEnrichmentProvider.class, config, CONFIG_KEY);
}
@Override
protected String getConfigKey() {
return CONFIG_KEY;
}
}
}