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TimestampPersistence.java
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TimestampPersistence.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.internal.utils.pekko.streaming;
import java.time.Instant;
import java.util.Optional;
import javax.annotation.Nullable;
import org.apache.pekko.Done;
import org.apache.pekko.NotUsed;
import org.apache.pekko.japi.Pair;
import org.apache.pekko.stream.javadsl.Source;
/**
* Defines operations for managing metadata of streams.
*/
public interface TimestampPersistence {
/**
* Updates the timestamp in the persistence..
*
* @param timestamp The timestamp.
* @return a {@link Source} holding the publisher to execute the operation.
*/
Source<NotUsed, NotUsed> setTimestamp(Instant timestamp);
/**
* Update the timestamp with a tag.
*
* @param timestamp the timestamp to persist.
* @param tag the tag.
* @return source that completes after the update completes.
*/
Source<Done, NotUsed> setTaggedTimestamp(Instant timestamp, @Nullable String tag);
/**
* Retrieve the timestamp in the persistence.
*
* @return a {@link Source} of the {@link Instant} stored in the persistence.
*/
Source<Optional<Instant>, NotUsed> getTimestampAsync();
/**
* Retrieve the tagged timestamp if any exists in the collection.
*
* @return the tagged timestamp.
*/
Source<Optional<Pair<Instant, String>>, NotUsed> getTaggedTimestamp();
}