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SignalTransformers.java
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SignalTransformers.java
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/*
* Copyright (c) 2022 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.base.service.signaltransformer;
import static org.eclipse.ditto.base.model.common.ConditionChecker.checkNotNull;
import java.util.List;
import java.util.concurrent.CompletableFuture;
import java.util.concurrent.CompletionStage;
import java.util.stream.Collectors;
import org.eclipse.ditto.base.model.signals.Signal;
import org.eclipse.ditto.internal.utils.extension.DittoExtensionIds;
import org.eclipse.ditto.internal.utils.extension.DittoExtensionPoint;
import org.eclipse.ditto.internal.utils.extension.DittoExtensionPoint.ExtensionId.ExtensionIdConfig;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import com.typesafe.config.Config;
import com.typesafe.config.ConfigValue;
import akka.actor.ActorSystem;
public final class SignalTransformers implements DittoExtensionPoint, SignalTransformer {
private static final Logger LOGGER = LoggerFactory.getLogger(SignalTransformers.class);
private static final String SIGNAL_TRANSFORMERS = "signal-transformers";
private final List<SignalTransformer> transformers;
@SuppressWarnings("unused")
private SignalTransformers(final ActorSystem actorSystem, final Config config) {
final DittoExtensionIds dittoExtensionIds = DittoExtensionIds.get(actorSystem);
final List<ConfigValue> configuredTransformers =
config.hasPath(SIGNAL_TRANSFORMERS) ? config.getList(SIGNAL_TRANSFORMERS) : List.of();
transformers = configuredTransformers
.stream()
.map(configValue -> ExtensionIdConfig.of(SignalTransformer.class, configValue))
.map(extensionIdConfig -> dittoExtensionIds.computeIfAbsent(extensionIdConfig,
SignalTransformerExtensionId::new))
.map(extensionId -> extensionId.get(actorSystem))
.toList();
final String loadedSignalTransformersAsCommaSeparatedList =
transformers.stream().map(Object::getClass).map(Class::getName).collect(Collectors.joining(","));
LOGGER.info("Instantiated the following signal transformers: {}.", loadedSignalTransformersAsCommaSeparatedList);
}
@Override
public CompletionStage<Signal<?>> apply(final Signal<?> signal) {
CompletionStage<Signal<?>> prior = CompletableFuture.completedStage(signal);
for (final SignalTransformer signalTransformer : transformers) {
prior = prior.thenCompose(signalTransformer);
}
return prior.whenComplete((result, error) -> {
if(error != null) {
LOGGER.warn("Error happened during signal transforming. This should not happen. If the signal" +
"transformer is designed to throw an exception in case of an invalid signal it should" +
"most likely be a PreEnforcer instead.");
} else {
LOGGER.debug("Signal transforming of <{}> resulted in <{}>.", signal, result);
}
});
}
/**
* Loads all implementation of {@code SignalTransformer} which is configured for the {@code ActorSystem}.
*
* @param actorSystem the actorSystem in which the {@code SignalTransformers} should be loaded.
* @return the {@code SignalTransformers}.
* @throws NullPointerException if {@code actorSystem} is {@code null}.
*/
public static SignalTransformers 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);
}
private static final class ExtensionId extends DittoExtensionPoint.ExtensionId<SignalTransformers> {
private static final String CONFIG_KEY = "signal-transformers-provider";
private ExtensionId(final ExtensionIdConfig<SignalTransformers> extensionIdConfig) {
super(extensionIdConfig);
}
static ExtensionIdConfig<SignalTransformers> computeConfig(final Config config) {
return ExtensionIdConfig.of(SignalTransformers.class, config, CONFIG_KEY);
}
@Override
protected String getConfigKey() {
return CONFIG_KEY;
}
}
private static final class SignalTransformerExtensionId extends DittoExtensionPoint.ExtensionId<SignalTransformer> {
SignalTransformerExtensionId(final ExtensionIdConfig<SignalTransformer> extensionIdConfig) {
super(extensionIdConfig);
}
@Override
protected String getConfigKey() {
throw new UnsupportedOperationException("SignalTransformers do not support an individual config key. " +
"They should be configured in the " +
"ditto.extensions.signal-transformers-provider.extension-config.signal-transformers list.");
}
}
}