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SseEventSniffer.java
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SseEventSniffer.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.gateway.service.endpoints.routes.sse;
import static org.eclipse.ditto.base.model.common.ConditionChecker.checkNotNull;
import org.eclipse.ditto.internal.utils.extension.DittoExtensionPoint;
import org.eclipse.ditto.internal.utils.extension.DittoExtensionIds;
import com.typesafe.config.Config;
import org.apache.pekko.NotUsed;
import org.apache.pekko.actor.ActorSystem;
import org.apache.pekko.http.javadsl.model.HttpRequest;
import org.apache.pekko.http.javadsl.model.sse.ServerSentEvent;
import org.apache.pekko.stream.javadsl.Flow;
/**
* Functional interface to sniff events over or SSE.
*/
public interface SseEventSniffer extends DittoExtensionPoint {
/**
* Create an async flow for event sniffing.
*
* @param request the HTTP request that started the event stream.
* @return flow to pass events through with a wiretap attached over an async barrier to the sink for sniffed events.
*/
Flow<ServerSentEvent, ServerSentEvent, NotUsed> toAsyncFlow(final HttpRequest request);
/**
* Loads the implementation of {@code SseEventSniffer} which is configured for the
* {@code ActorSystem}.
*
* @param actorSystem the actorSystem in which the {@code SseEventSniffer} should be loaded.
* @param config the config the extension is configured.
* @return the {@code SseEventSniffer} implementation.
* @throws NullPointerException if {@code actorSystem} is {@code null}.
* @since 3.0.0
*/
static SseEventSniffer 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<SseEventSniffer> {
private static final String CONFIG_KEY = "sse-event-sniffer";
private ExtensionId(final ExtensionIdConfig<SseEventSniffer> extensionIdConfig) {
super(extensionIdConfig);
}
static ExtensionIdConfig<SseEventSniffer> computeConfig(final Config config) {
return ExtensionIdConfig.of(SseEventSniffer.class, config, CONFIG_KEY);
}
@Override
protected String getConfigKey() {
return CONFIG_KEY;
}
}
}