com.mercateo.eventstore.connection.EventStream Maven / Gradle / Ivy

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Common functionaliy for EventStore client.
There is a newer version: 0.3.5
/**
 * Copyright © 2018 Mercateo AG (http://www.mercateo.com)
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package com.mercateo.eventstore.connection;

import static com.github.msemys.esjc.ExpectedVersion.ANY;

import java.util.concurrent.CompletableFuture;

import com.github.msemys.esjc.CatchUpSubscription;
import com.github.msemys.esjc.CatchUpSubscriptionListener;
import com.github.msemys.esjc.EventData;
import com.github.msemys.esjc.EventReadResult;
import com.github.msemys.esjc.EventStore;
import com.github.msemys.esjc.WriteResult;
import com.mercateo.eventstore.domain.EventStreamId;

import io.vavr.control.Option;
import lombok.ToString;
import lombok.extern.slf4j.Slf4j;

@Slf4j
@ToString
public class EventStream {

    public static final int BEFORE_FIRST_EVENT = -1;

    public static final String EVENT_STREAM_ID_SEPARATOR = "/";

    private final EventStreamId eventStreamId;

    private final EventStore eventStoreClient;

    private Option catchUpSubscription;

    public EventStream(EventStore eventStoreClient, EventStreamId eventStreamId) {
        this.eventStreamId = eventStreamId;
        this.eventStoreClient = eventStoreClient;
    }

    public CompletableFuture append(long expectedVersion, EventData eventData) {
        return eventStoreClient.appendToStream(eventStreamId.eventStreamName().value(), expectedVersion, eventData);
    }

    public CompletableFuture append(long expectedVersion, Iterable eventData) {
        return eventStoreClient.appendToStream(eventStreamId.eventStreamName().value(), expectedVersion, eventData);
    }

    public CompletableFuture append(EventData eventData) {
        return append(ANY, eventData);
    }

    public CompletableFuture append(Iterable eventData) {
        return append(ANY, eventData);
    }

    public void subscribeToStreamFrom(long eventNumber, CatchUpSubscriptionListener eventStreamListener) {
        catchUpSubscription = Option.of(eventStoreClient.subscribeToStreamFrom(eventStreamId.eventStreamName().value(),
                eventNumber == BEFORE_FIRST_EVENT ? null : eventNumber, eventStreamListener));

    }

    public EventStreamId getEventStreamId() {
        return eventStreamId;
    }

    public CompletableFuture readEvent(int eventNumber, boolean resolveLinkTos) {
        return eventStoreClient.readEvent(eventStreamId.eventStreamName().value(), eventNumber, resolveLinkTos);
    }

    public void stopSubscription() {
        catchUpSubscription.forEach(CatchUpSubscription::stop);
    }
}