private void createSpy(final DomainEventStream eventStream) {
lastSpy = mock(DomainEventStream.class);
when(lastSpy.next())
.thenAnswer(
new Answer<Object>() {
@Override
public Object answer(InvocationOnMock invocation) throws Throwable {
return eventStream.next();
}
});
when(lastSpy.hasNext())
.thenAnswer(
new Answer<Object>() {
@Override
public Object answer(InvocationOnMock invocation) throws Throwable {
return eventStream.hasNext();
}
});
when(lastSpy.peek())
.thenAnswer(
new Answer<Object>() {
@Override
public Object answer(InvocationOnMock invocation) throws Throwable {
return eventStream.peek();
}
});
}
/**
* Checks that {@link DomainEventStream} contains only DomainEvents form the passed in list.
* equals method will be used to check equality.
*
* @param appendedEvents List of DomainEvents that should be contained into the stream.
* @param readEvents {@link DomainEventStream} to be checked.
*/
public static void assertDomainEventsEquality(
List<? extends DomainEvent> appendedEvents, DomainEventStream readEvents) {
for (DomainEvent appendedEvent : appendedEvents) {
assertTrue(readEvents.hasNext());
final DomainEvent readEvent = readEvents.next();
assertEquals(appendedEvent, readEvent);
}
assertFalse(readEvents.hasNext());
}
/**
* {@inheritDoc}
*
* <p>This implementation is aware of a special type of <code>DomainEvents</code>: the <code>
* AggregateSnapshot</code>, which is a snapshot event, containing the actual aggregate inside.
*
* <p><code>AggregateSnapshot</code> events are used to initialize the aggregate with the correct
* version ({@link #getVersion()}).
*
* @throws IllegalStateException if this aggregate was already initialized.
*/
@Override
public void initializeState(DomainEventStream domainEventStream) {
Assert.state(getUncommittedEventCount() == 0, "Aggregate is already initialized");
long lastSequenceNumber = -1;
while (domainEventStream.hasNext()) {
DomainEventMessage event = domainEventStream.next();
lastSequenceNumber = event.getSequenceNumber();
handleRecursively(event);
}
initializeEventStream(lastSequenceNumber);
}
@Override
public void appendEvents(String type, DomainEventStream events) {
if (!events.hasNext()) {
return;
}
String key = events.peek().getAggregateIdentifier().toString();
DomainEventMessage<?> lastEvent = null;
while (events.hasNext()) {
countDownLatch.countDown();
lastEvent = events.next();
}
storedEvents.put(key, lastEvent);
}
@Override
public void appendEvents(String type, DomainEventStream events) {
if (!events.hasNext()) {
return;
}
String key = events.peek().getAggregateIdentifier().toString();
DomainEventMessage<?> lastEvent = null;
while (events.hasNext()) {
countDownLatch.countDown();
lastEvent = events.next();
if (FailingEvent.class.isAssignableFrom(lastEvent.getPayloadType())) {
throw new RuntimeException("This is a failing event. EventStore refuses to store that");
}
}
storedEvents.put(key, lastEvent);
}
public static void main(String[] args) throws IOException {
// we want to delete the directory that will store our events
final File eventsDir = new File(System.getProperty("java.io.tmpdir"), "Events");
FileUtils.deleteDirectory(eventsDir);
// we create a serializer, so we can ensure the event store and the upcasters use the same
// configuration
Serializer serializer = new XStreamSerializer();
// initialize a FileSystem Event Store
FileSystemEventStore eventStore =
new FileSystemEventStore(serializer, new SimpleEventFileResolver(eventsDir));
// initialize the upcaster chain with our upcaster
eventStore.setUpcasterChain(
new LazyUpcasterChain(
serializer, Collections.<Upcaster>singletonList(new ToDoItemUpcaster())));
// we append some events. Notice we append a "ToDoItemCreatedEvent".
eventStore.appendEvents(
"UpcasterSample",
new SimpleDomainEventStream(
new GenericDomainEventMessage(
"todo1", 0, new ToDoItemCreatedEvent("todo1", "I need to do this today")),
new GenericDomainEventMessage("todo1", 1, new ToDoItemCompletedEvent("todo1"))));
eventStore.appendEvents(
"UpcasterSample",
new SimpleDomainEventStream(
new GenericDomainEventMessage(
"todo2", 0, new ToDoItemCreatedEvent("todo2", "I also need to do this"))));
// now, we read the events from the "todo1" stream
DomainEventStream eventStream = eventStore.readEvents("UpcasterSample", "todo1");
while (eventStream.hasNext()) {
// and print them, so that we can see what we ended up with
System.out.println(eventStream.next().getPayload().toString());
}
}
@Test
public void testCommandHandlerLoadsSameAggregateTwice() {
DefaultUnitOfWork.startAndGet();
StubAggregate stubAggregate = new StubAggregate(aggregateIdentifier);
stubAggregate.doSomething();
repository.add(stubAggregate);
CurrentUnitOfWork.commit();
DefaultUnitOfWork.startAndGet();
repository.load(aggregateIdentifier).doSomething();
repository.load(aggregateIdentifier).doSomething();
CurrentUnitOfWork.commit();
DomainEventStream es = mockEventStore.readEvents("", aggregateIdentifier);
assertTrue(es.hasNext());
assertEquals((Object) 0L, es.next().getSequenceNumber());
assertTrue(es.hasNext());
assertEquals((Object) 1L, es.next().getSequenceNumber());
assertTrue(es.hasNext());
assertEquals((Object) 2L, es.next().getSequenceNumber());
assertFalse(es.hasNext());
}
@Override
public DomainEventMessage peek() {
return delegate.peek();
}
@Override
public DomainEventMessage next() {
DomainEventMessage next = delegate.next();
counter.incrementAndGet();
return next;
}
@Override
public boolean hasNext() {
return delegate.hasNext();
}
@Override
public void appendEvents(String type, DomainEventStream events) {
while (events.hasNext()) {
storedEvents.add(events.next());
}
}