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SubscriptionsReader.java
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SubscriptionsReader.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.internal.utils.pubsub.ddata;
import java.util.Collection;
import java.util.Map;
import java.util.Set;
import java.util.stream.Collectors;
import org.apache.pekko.actor.ActorRef;
/**
* Reader of local subscriptions.
*/
public final class SubscriptionsReader {
private final Map<ActorRef, SubscriberData> subscriberDataMap;
private SubscriptionsReader(final Map<ActorRef, SubscriberData> subscriberDataMap) {
this.subscriberDataMap = subscriberDataMap;
}
/**
* @return An empty subscription-reader.
*/
public static SubscriptionsReader empty() {
return new SubscriptionsReader(Map.of());
}
/**
* Construct a subscriptions-reader from immutable collections.
*
* @param subscriberDataMap a map from subscriber to its topics, group and filter.
* @return a subscription-reader.
*/
public static SubscriptionsReader fromSubscriberData(final Map<ActorRef, SubscriberData> subscriberDataMap) {
return new SubscriptionsReader(subscriberDataMap);
}
/**
* @return the ternary relation between subscribers, groups and topics.
*/
public Map<ActorRef, SubscriberData> getSubscriberDataMap() {
return subscriberDataMap;
}
/**
* Look up the set of subscribers subscribing to at least one of the given topics.
* NOT performant. Only intended for tests.
*
* @param topics the topics.
* @return the set of subscribers.
*/
public Set<ActorRef> getSubscribers(final Collection<String> topics) {
return subscriberDataMap.entrySet()
.stream()
.filter(entry -> topics.stream().anyMatch(entry.getValue().getTopics()::contains))
.map(Map.Entry::getKey)
.collect(Collectors.toSet());
}
@Override
public boolean equals(final Object other) {
if (other instanceof SubscriptionsReader) {
final SubscriptionsReader that = (SubscriptionsReader) other;
return subscriberDataMap.equals(that.subscriberDataMap);
} else {
return false;
}
}
@Override
public int hashCode() {
return subscriberDataMap.hashCode();
}
@Override
public String toString() {
return getClass().getSimpleName() + " [" +
"subscriberDataMap=" + subscriberDataMap +
"]";
}
}