server/task/task-memory/src/test/java/org/apache/james/task/eventsourcing/TaskAggregateTest.java

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package org.apache.james.task.eventsourcing;

import static org.assertj.core.api.Assertions.assertThat;

import java.util.Arrays;
import java.util.function.Function;
import java.util.stream.Collectors;
import java.util.stream.Stream;

import org.apache.james.eventsourcing.Event;
import org.apache.james.eventsourcing.EventId;
import org.apache.james.eventsourcing.eventstore.History;
import org.apache.james.task.Hostname;
import org.apache.james.task.MemoryReferenceWithCounterTask;
import org.apache.james.task.Task;
import org.apache.james.task.TaskId;
import org.junit.jupiter.api.Test;

import com.google.common.collect.Streams;
import scala.None;
import scala.None$;

class TaskAggregateTest {

    static final Hostname HOSTNAME = Hostname.apply("foo");
    static final TaskAggregateId ID = TaskAggregateId.apply(TaskId.generateTaskId());

    History buildHistory(Function<EventId, Event>... events) {
        return History.of(
            Streams.zip(
                    Stream.iterate(EventId.first(), EventId::next),
                    Arrays.stream(events),
                    (id, event) -> event.apply(id))
                .collect(Collectors.toList()));
    }

    @Test
    void givenNoStartedTaskEmitNoEventWhenUpdateAdditionalInformationCommand() {
        History history = buildHistory(
            eventId -> Created.apply(ID, eventId, new MemoryReferenceWithCounterTask((counter) -> Task.Result.COMPLETED), HOSTNAME)
        );
        TaskAggregate aggregate = TaskAggregate.fromHistory(ID, history);
        assertThat(aggregate.update(new MemoryReferenceWithCounterTask.AdditionalInformation(3))).isEmpty();
    }

    @Test
    void givenInProgressTaskEmitEventWhenUpdateAdditionalInformationCommand() {
        History history = buildHistory(
            eventId -> Created.apply(ID, eventId, new MemoryReferenceWithCounterTask((counter) -> Task.Result.COMPLETED), HOSTNAME),
            eventId -> Started.apply(ID, eventId, HOSTNAME)
        );
        TaskAggregate aggregate = TaskAggregate.fromHistory(ID, history);
        assertThat(aggregate.update(new MemoryReferenceWithCounterTask.AdditionalInformation(3)))
            .containsExactly(AdditionalInformationUpdated.apply(ID, history.getNextEventId(), new MemoryReferenceWithCounterTask.AdditionalInformation(3)));
    }

    @Test
    void givenCancelRequestedTaskEmitEventWhenUpdateAdditionalInformationCommand() {
        History history = buildHistory(
            eventId -> Created.apply(ID, eventId, new MemoryReferenceWithCounterTask((counter) -> Task.Result.COMPLETED), HOSTNAME),
            eventId -> Started.apply(ID, eventId, HOSTNAME),
            eventId -> CancelRequested.apply(ID, eventId, HOSTNAME)
        );
        TaskAggregate aggregate = TaskAggregate.fromHistory(ID, history);
        assertThat(aggregate.update(new MemoryReferenceWithCounterTask.AdditionalInformation(3)))
            .containsExactly(AdditionalInformationUpdated.apply(ID, history.getNextEventId(), new MemoryReferenceWithCounterTask.AdditionalInformation(3)));
    }

    @Test
    void givenCompletedTaskEmitNoEventWhenUpdateAdditionalInformationCommand() {
        MemoryReferenceWithCounterTask task = new MemoryReferenceWithCounterTask((counter) -> Task.Result.COMPLETED);
        History history = buildHistory(
            eventId -> Created.apply(ID, eventId, task, HOSTNAME),
            eventId -> Started.apply(ID, eventId, HOSTNAME),
            eventId -> Completed.apply(ID, eventId, Task.Result.COMPLETED, task.type(), None$.empty())
        );
        TaskAggregate aggregate = TaskAggregate.fromHistory(ID, history);
        assertThat(aggregate.update(new MemoryReferenceWithCounterTask.AdditionalInformation(3))).isEmpty();
    }

    @Test
    void givenFailedTaskEmitNoEventWhenUpdateAdditionalInformationCommand() {
        MemoryReferenceWithCounterTask task = new MemoryReferenceWithCounterTask((counter) -> Task.Result.COMPLETED);
        History history = buildHistory(
            eventId -> Created.apply(ID, eventId, task, HOSTNAME),
            eventId -> Started.apply(ID, eventId, HOSTNAME),
            eventId -> Failed.apply(ID, eventId, task.type(), None$.empty())
        );
        TaskAggregate aggregate = TaskAggregate.fromHistory(ID, history);
        assertThat(aggregate.update(new MemoryReferenceWithCounterTask.AdditionalInformation(3))).isEmpty();
    }

    @Test
    void givenCancelTaskEmitNoEventWhenUpdateAdditionalInformationCommand() {
        MemoryReferenceWithCounterTask task = new MemoryReferenceWithCounterTask((counter) -> Task.Result.COMPLETED);
        History history = buildHistory(
            eventId -> Created.apply(ID, eventId, task, HOSTNAME),
            eventId -> Started.apply(ID, eventId, HOSTNAME),
            eventId -> Cancelled.apply(ID, eventId, task.type(), None$.empty())
        );
        TaskAggregate aggregate = TaskAggregate.fromHistory(ID, history);
        assertThat(aggregate.update(new MemoryReferenceWithCounterTask.AdditionalInformation(3))).isEmpty();
    }
}