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MessageMapperExtension.java
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MessageMapperExtension.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.connectivity.service.mapping;
import static org.eclipse.ditto.base.model.common.ConditionChecker.checkNotNull;
import javax.annotation.Nullable;
import org.eclipse.ditto.connectivity.model.ConnectionId;
import org.eclipse.ditto.internal.utils.extension.DittoExtensionIds;
import org.eclipse.ditto.internal.utils.extension.DittoExtensionPoint;
import com.typesafe.config.Config;
import akka.actor.ActorSystem;
/**
* Interface for wrapping an existing message mapper after creation.
*/
public interface MessageMapperExtension extends DittoExtensionPoint {
/**
* Instantiates a message mapper.
*
* @param connectionId ID of the connection.
* @param mapper the mapper that can be extended or wrapped.
* @return an instantiated message mapper according to the mapping context if instantiation is possible, or
* {@code null} otherwise.
*/
@Nullable
MessageMapper apply(ConnectionId connectionId, MessageMapper mapper);
/**
* Loads the implementation of {@code MessageMapperExtension} which is configured for the {@code ActorSystem}.
*
* @param actorSystem the actorSystem in which the {@code MessageMapperExtension} should be loaded.
* @param config the configuration for this extension.
* @return the {@code MessageMapperExtension} implementation.
* @throws NullPointerException if {@code actorSystem} is {@code null}.
* @since 3.0.0
*/
static MessageMapperExtension 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);
}
final class ExtensionId extends DittoExtensionPoint.ExtensionId<MessageMapperExtension> {
private static final String CONFIG_KEY = "message-mapper-extension";
private ExtensionId(final ExtensionIdConfig<MessageMapperExtension> extensionIdConfig) {
super(extensionIdConfig);
}
static ExtensionIdConfig<MessageMapperExtension> computeConfig(final Config config) {
return ExtensionIdConfig.of(MessageMapperExtension.class, config, CONFIG_KEY);
}
@Override
protected String getConfigKey() {
return CONFIG_KEY;
}
}
}