Examples of org.axonframework.upcasting.LazyUpcasterChain$LazyUpcastObject

org.axonframework.upcasting.LazyUpcasterChain
UpcasterChain implementation that delays the actual upcasting until the data inside the returned SerializedObject is actually fetched. This makes this implementation perform better in cases where not all events are used.
Ordering guarantees:
This upcasterChain only guarantees that for each of the configured upcasters, all previous upcasters have had the opportunity to upcast the SerializedObject first. This UpcasterChain does not guarantee that, for each upcaster, all events are upcast in the order they are provided in the stream.
Note that this implementation is not suitable if you require each upcaster to upcast all events in a stream in order. See {@link SimpleUpcasterChain} instead for these cases. @author Allard Buijze @since 2.0

        // 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")),

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        testSubject.appendEvents("test", new SimpleDomainEventStream(createDomainEvents(10)));
        final GenericDomainEventMessage eventMessage = new GenericDomainEventMessage<String>("test", 0, "test");
        testSubject.appendEvents("test", new SimpleDomainEventStream(eventMessage));
        testSubject.appendEvents("test", new SimpleDomainEventStream(createDomainEvents(10)));
        // we upcast the event to two instances, one of which is an unknown class
        testSubject.setUpcasterChain(new LazyUpcasterChain(Arrays.<Upcaster>asList(new StubUpcaster())));
        testSubject.visitEvents(eventVisitor);


        verify(eventVisitor, times(21)).doWithEvent(isA(DomainEventMessage.class));
    }

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        testSubject.appendEvents("test", new SimpleDomainEventStream(createDomainEvents(10)));
        final GenericDomainEventMessage eventMessage = new GenericDomainEventMessage<String>("test", 0, "test");
        testSubject.appendEvents("test", new SimpleDomainEventStream(eventMessage));
        testSubject.appendEvents("test", new SimpleDomainEventStream(createDomainEvents(10)));
        // we upcast the event to two instances, one of which is an unknown class
        testSubject.setUpcasterChain(new LazyUpcasterChain(Arrays.<Upcaster>asList(new StubUpcaster())));
        testSubject.visitEvents(eventVisitor);


        verify(eventVisitor, times(21)).doWithEvent(isA(DomainEventMessage.class));
    }

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        testSubject.appendEvents("test", new SimpleDomainEventStream(createDomainEvents(10)));
        final GenericDomainEventMessage eventMessage = new GenericDomainEventMessage<String>("test", 0, "test");
        testSubject.appendEvents("test", new SimpleDomainEventStream(eventMessage));
        testSubject.appendEvents("test", new SimpleDomainEventStream(createDomainEvents(10)));
        // we upcast the event to two instances, one of which is an unknown class
        testSubject.setUpcasterChain(new LazyUpcasterChain(Arrays.<Upcaster>asList(new StubUpcaster())));
        testSubject.visitEvents(eventVisitor);


        verify(eventVisitor, times(21)).doWithEvent(isA(DomainEventMessage.class));
    }

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        testSubject.appendEvents("test", new SimpleDomainEventStream(createDomainEvents(10)));
        final GenericDomainEventMessage eventMessage = new GenericDomainEventMessage<String>("test", 0, "test");
        testSubject.appendEvents("test", new SimpleDomainEventStream(eventMessage));
        testSubject.appendEvents("test", new SimpleDomainEventStream(createDomainEvents(10)));
        // we upcast the event to two instances, one of which is an unknown class
        testSubject.setUpcasterChain(new LazyUpcasterChain(Arrays.<Upcaster>asList(new StubUpcaster())));
        testSubject.visitEvents(eventVisitor);


        verify(eventVisitor, times(21)).doWithEvent(isA(DomainEventMessage.class));
    }

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        testSubject.appendEvents("test", new SimpleDomainEventStream(createDomainEvents(10)));
        final GenericDomainEventMessage eventMessage = new GenericDomainEventMessage<String>("test", 0, "test");
        testSubject.appendEvents("test", new SimpleDomainEventStream(eventMessage));
        testSubject.appendEvents("test", new SimpleDomainEventStream(createDomainEvents(10)));
        // we upcast the event to two instances, one of which is an unknown class
        testSubject.setUpcasterChain(new LazyUpcasterChain(Arrays.<Upcaster>asList(new StubUpcaster())));
        testSubject.visitEvents(eventVisitor);


        verify(eventVisitor, times(21)).doWithEvent(isA(DomainEventMessage.class));
    }

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