io.axoniq.axonserver.connector.event.impl.AppendEventsTransactionImpl Maven / Gradle / Ivy

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/*
 * Copyright (c) 2020. AxonIQ
 *
 * 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 io.axoniq.axonserver.connector.event.impl;

import io.axoniq.axonserver.connector.event.AppendEventsTransaction;
import io.axoniq.axonserver.grpc.event.Confirmation;
import io.axoniq.axonserver.grpc.event.Event;
import io.grpc.Status;
import io.grpc.StatusRuntimeException;
import io.grpc.stub.StreamObserver;

import java.util.concurrent.CompletableFuture;

/**
 * Implementation of the {@link AppendEventsTransaction} used to append events to the Event Store.
 */
public class AppendEventsTransactionImpl implements AppendEventsTransaction {

    private final StreamObserver stream;
    private final CompletableFuture result;

    /**
     * Constructs a {@link AppendEventsTransactionImpl} used to append events to the Event Store.
     *
     * @param stream the {@link StreamObserver} of {@link Event} instances which should be appended
     * @param result a {@link CompletableFuture} resolving the {@link Confirmation} of the successful processing of this
     *               transaction
     */
    public AppendEventsTransactionImpl(StreamObserver stream, CompletableFuture result) {
        this.stream = stream;
        this.result = result;
    }

    @Override
    public AppendEventsTransaction appendEvent(Event event) {
        stream.onNext(event);
        return this;
    }

    @Override
    public CompletableFuture commit() {
        stream.onCompleted();
        return result;
    }

    @Override
    public void rollback() {
        stream.onError(new StatusRuntimeException(Status.CANCELLED));
    }
}