com.mercateo.eventstore.writer.EventStoreWriter Maven / Gradle / Ivy

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/**
 * 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.writer;

import org.springframework.stereotype.Component;

import com.mercateo.eventstore.domain.Event;
import com.mercateo.eventstore.domain.EventStoreFailure;
import com.mercateo.eventstore.writer.domain.EventWriter;

import io.vavr.control.Either;
import lombok.AllArgsConstructor;
import lombok.extern.slf4j.Slf4j;

import java.util.Collections;

@Slf4j
@Component("eventStoreWriter")
@AllArgsConstructor
public class EventStoreWriter implements EventWriter {

    private final EventStoreEventMapper eventMapper;

    private final EventSender eventSender;

    private void logFailure(Iterable events, EventStoreFailure failure) {
        events.forEach(event -> log.error("Event {} not saved: {}", event, failure));
    }

    @Override
    public  Either write(E event) {
        return write(Collections.singleton(event)).map(ignore -> event);
    }

    @Override
    public > Either write(E events) {
        return eventMapper
            .toEventStoreEvent(events)
            .flatMap(eventSender::send)
            .peek(r -> logSuccess(events))
            .peekLeft(f -> logFailure(events, f))
            .map(ignore -> events);
    }

    private void logSuccess(Iterable events) {
        events.forEach(event -> log.info("Event {} saved", event));
    }
}