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Default Java client library for interfacing with Flux Capacitor.
/*
* Copyright (c) Flux Capacitor IP B.V. or its affiliates. All Rights Reserved.
*
* 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.fluxcapacitor.javaclient.modeling;
import io.fluxcapacitor.common.handling.HandlerInvoker;
import io.fluxcapacitor.javaclient.common.Message;
import io.fluxcapacitor.javaclient.common.serialization.DeserializingMessage;
import io.fluxcapacitor.javaclient.common.serialization.Serializer;
import io.fluxcapacitor.javaclient.persisting.eventsourcing.Apply;
import io.fluxcapacitor.javaclient.publishing.DispatchInterceptor;
import io.fluxcapacitor.javaclient.tracking.handling.Invocation;
import lombok.EqualsAndHashCode;
import lombok.NonNull;
import lombok.ToString;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Comparator;
import java.util.LinkedHashMap;
import java.util.List;
import java.util.Map;
import java.util.Objects;
import java.util.Optional;
import java.util.concurrent.atomic.AtomicBoolean;
import java.util.function.Supplier;
import java.util.function.UnaryOperator;
import java.util.stream.Collectors;
import static io.fluxcapacitor.common.MessageType.EVENT;
import static io.fluxcapacitor.javaclient.modeling.EventPublication.IF_MODIFIED;
import static java.util.Optional.ofNullable;
import static java.util.stream.Collectors.toMap;
@ToString(onlyExplicitlyIncluded = true)
@EqualsAndHashCode(onlyExplicitlyIncluded = true)
public class ModifiableAggregateRoot extends DelegatingEntity implements AggregateRoot {
private static final ThreadLocal>> activeAggregates =
ThreadLocal.withInitial(LinkedHashMap::new);
@SuppressWarnings("unchecked")
public static Optional> getIfActive(Object aggregateId) {
return ofNullable((ModifiableAggregateRoot) activeAggregates.get().get(aggregateId));
}
public static Map> getActiveAggregatesFor(@NonNull Object entityId) {
List> candidates = activeAggregates.get().values().stream()
.filter(a -> a.getEntity(entityId).isPresent()).collect(Collectors.toList());
Comparator> byPresent = Comparator.comparing(
a -> a.getEntity(entityId).map(Entity::isPresent).orElse(false));
Comparator> byOrder = Comparator.comparing(candidates::indexOf);
return candidates.stream()
.sorted(byPresent.thenComparing(byOrder))
.collect(toMap(e -> e.id().toString(), Entity::type, (a, b) -> b, LinkedHashMap::new));
}
public static Entity load(
Object aggregateId, Supplier> loader, boolean commitInBatch, EventPublication eventPublication,
EventPublicationStrategy publicationStrategy,
EntityHelper entityHelper, Serializer serializer, DispatchInterceptor dispatchInterceptor,
CommitHandler commitHandler) {
return ModifiableAggregateRoot.getIfActive(aggregateId).orElseGet(
() -> new ModifiableAggregateRoot<>(loader.get(), commitInBatch, eventPublication, publicationStrategy,
entityHelper, serializer, dispatchInterceptor, commitHandler));
}
private Entity lastCommitted;
private Entity lastStable;
private final boolean commitInBatch;
private final EventPublication aggregateEventPublication;
private final EventPublicationStrategy aggregatePublicationStrategy;
private final EntityHelper entityHelper;
private final Serializer serializer;
private final DispatchInterceptor dispatchInterceptor;
private final CommitHandler commitHandler;
private final AtomicBoolean waitingForHandlerEnd = new AtomicBoolean(), waitingForBatchEnd = new AtomicBoolean();
private final List applied = new ArrayList<>(), uncommitted = new ArrayList<>();
private final List>> queued = new ArrayList<>();
private volatile boolean updating, committing, commitPending;
protected ModifiableAggregateRoot(Entity delegate, boolean commitInBatch,
EventPublication eventPublication, EventPublicationStrategy publicationStrategy,
EntityHelper entityHelper, Serializer serializer,
DispatchInterceptor dispatchInterceptor, CommitHandler commitHandler) {
super(delegate);
this.entityHelper = entityHelper;
this.lastCommitted = delegate;
this.lastStable = delegate;
this.commitInBatch = commitInBatch;
this.aggregateEventPublication = eventPublication;
this.aggregatePublicationStrategy = publicationStrategy;
this.serializer = serializer;
this.dispatchInterceptor = dispatchInterceptor;
this.commitHandler = commitHandler;
}
@Override
public Entity assertLegal(Object command) throws E {
entityHelper.intercept(command, this).forEach(c -> entityHelper.assertLegal(c, this));
return this;
}
@Override
public Entity assertAndApply(Object payloadOrMessage) {
entityHelper.intercept(payloadOrMessage, this).forEach(m -> apply(Message.asMessage(m), true));
return this;
}
@Override
public Entity update(UnaryOperator function) {
return handleUpdate(a -> a.update(function));
}
@Override
public Entity apply(Message message) {
entityHelper.intercept(message, this).forEach(m -> apply(Message.asMessage(m), false));
return this;
}
protected Entity apply(Message message, boolean assertLegal) {
return handleUpdate(a -> {
if (assertLegal) {
entityHelper.assertLegal(message, a);
}
Optional applyAnnotation = entityHelper.applyInvoker(
new DeserializingMessage(message, EVENT, serializer), a, true)
.map(HandlerInvoker::getMethodAnnotation);
var eventPublication = applyAnnotation.map(Apply::eventPublication)
.filter(ep -> ep != EventPublication.DEFAULT).orElse(this.aggregateEventPublication);
int hashCodeBefore = eventPublication == IF_MODIFIED ? a.get() == null ? -1 : a.get().hashCode() : -1;
Entity result = a.apply(message);
if (switch (eventPublication) {
case ALWAYS, DEFAULT -> true;
case IF_MODIFIED -> !Objects.equals(a.get(), result.get())
|| (result.get() != null && result.get().hashCode() != hashCodeBefore);
case NEVER -> false;
}) {
Message intercepted = dispatchInterceptor.interceptDispatch(message, EVENT);
if (intercepted == null) {
return a;
}
var publicationStrategy = applyAnnotation.map(Apply::publicationStrategy)
.filter(ep -> ep != EventPublicationStrategy.DEFAULT).orElse(this.aggregatePublicationStrategy);
Message m = publicationStrategy == EventPublicationStrategy.PUBLISH_ONLY
? intercepted.addMetadata(Entity.AGGREGATE_ID_METADATA_KEY, id().toString(),
Entity.AGGREGATE_TYPE_METADATA_KEY, type().getName())
: intercepted.addMetadata(Entity.AGGREGATE_ID_METADATA_KEY, id().toString(),
Entity.AGGREGATE_TYPE_METADATA_KEY, type().getName(),
Entity.AGGREGATE_SN_METADATA_KEY,
String.valueOf(getDelegate().sequenceNumber() + 1L));
var serializedEvent =
dispatchInterceptor.modifySerializedMessage(m.serialize(serializer), m, EVENT);
if (serializedEvent == null) {
return a;
}
applied.add(new AppliedEvent(new DeserializingMessage(serializedEvent, type ->
serializer.convert(m.getPayload(), type), EVENT), publicationStrategy));
}
return result;
});
}
protected Entity handleUpdate(UnaryOperator> update) {
if (updating) {
queued.add(update);
return this;
}
try {
updating = true;
boolean firstUpdate = waitingForHandlerEnd.compareAndSet(false, true);
if (firstUpdate) {
activeAggregates.get().putIfAbsent(id(), this);
}
try {
delegate = update.apply(getDelegate());
} finally {
if (firstUpdate) {
Invocation.whenHandlerCompletes((r, e) -> whenHandlerCompletes(e));
}
}
} finally {
updating = false;
}
while (!queued.isEmpty()) {
queued.removeFirst().apply(this);
}
return this;
}
protected void whenHandlerCompletes(Throwable error) {
waitingForHandlerEnd.set(false);
if (error == null) {
uncommitted.addAll(applied);
lastStable = delegate;
} else {
delegate = lastStable;
}
applied.clear();
if (!commitInBatch) {
commit();
activeAggregates.get().remove(id(), this);
} else if (waitingForBatchEnd.compareAndSet(false, true)) {
DeserializingMessage.whenBatchCompletes(this::whenBatchCompletes);
}
}
protected void whenBatchCompletes(Throwable error) {
waitingForBatchEnd.set(false);
commit();
activeAggregates.get().remove(id(), this);
}
@Override
public Entity commit() {
if (committing) {
commitPending = true;
return this;
}
try {
committing = true;
commitPending = false;
uncommitted.addAll(applied);
applied.clear();
lastStable = delegate;
List events = new ArrayList<>(uncommitted);
uncommitted.clear();
var before = lastCommitted;
lastCommitted = lastStable;
commitHandler.handle(lastStable, events, before);
} finally {
committing = false;
}
while (commitPending) {
commit();
}
return this;
}
@Override
public Collection> entities() {
return super.entities().stream().map(e -> new ModifiableEntity<>(e, this)).collect(Collectors.toList());
}
@Override
public Entity previous() {
Entity previous = getDelegate().previous();
return previous == null ? null : new ModifiableEntity<>(previous, this);
}
@FunctionalInterface
public interface CommitHandler {
void handle(Entity model, List unpublished, Entity beforeUpdate);
}
}
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