persistence module doc. update

common-persistence-api/src/main/java/com/mz/reactor/ddd/reactorddd/persistance/aggregate/AggregateActor.java

@@ -6,6 +6,11 @@ import reactor.core.publisher.Mono;
 
 import java.util.function.Function;
 
+/**
+ * Contract definition for Aggregate wrapper
+ * @param <A> - Aggregate type
+ * @param <C> - Command type
+ */
 public interface AggregateActor<A, C extends Command> {
 
   <S> Mono<S> getState(Function<A, S> stateFactory);

common-persistence-api/src/main/java/com/mz/reactor/ddd/reactorddd/persistance/aggregate/AggregateFacade.java

@@ -4,6 +4,12 @@ import com.mz.reactor.ddd.common.api.command.Command;
 import com.mz.reactor.ddd.common.api.event.DomainEvent;
 import reactor.core.publisher.Mono;
 
+/**
+ * Aggregate facade contract for operations related with aggregate.
+ * @param <A> - Aggregate type
+ * @param <C> - Command type
+ * @param <S> - State type, representing a state of aggregate
+ */
 public interface AggregateFacade<A, C extends Command,S> {
 
   Mono<S> execute(C command, String aggregateID);

common-persistence-api/src/main/java/com/mz/reactor/ddd/reactorddd/persistance/aggregate/AggregateFactory.java

@@ -1,4 +0,0 @@
-package com.mz.reactor.ddd.reactorddd.persistance.aggregate;
-
-public interface AggregateFactory {
-}

common-persistence-api/src/main/java/com/mz/reactor/ddd/reactorddd/persistance/aggregate/AggregateRepository.java

@@ -5,6 +5,12 @@ import com.mz.reactor.ddd.common.api.command.CommandResult;
 import com.mz.reactor.ddd.common.api.valueobject.Id;
 import reactor.core.publisher.Mono;
 
+/**
+ * {@link AggregateRepository} contract definition.
+ * @param <A> - Aggregate type
+ * @param <C> - Command type
+ * @param <S> - State type, representing a state of aggregate
+ */
 public interface AggregateRepository<A, C extends Command,S> {
 
   Mono<CommandResult> execute(C cmd, Id aggregateId);

common-persistence-api/src/main/java/com/mz/reactor/ddd/reactorddd/persistance/aggregate/impl/AggregateRepositoryImpl.java

@@ -23,84 +23,87 @@ import static java.util.stream.Collectors.toList;
 
 public class AggregateRepositoryImpl<A, C extends Command, S> implements AggregateRepository<A, C, S> {
 
-  private final AtomicReference<Map<Id, List<? extends DomainEvent>>> eventSource = new AtomicReference<>(new HashMap<>());
+    private final AtomicReference<Map<Id, List<? extends DomainEvent>>> eventSource = new AtomicReference<>(new HashMap<>());
 
-  private final Cache<Id, AggregateActor<A, C>> cache = CacheBuilder.newBuilder()
-      .expireAfterAccess(Duration.ofMinutes(10))
-      .removalListener((RemovalListener<Id, AggregateActor<A, C>>) notification -> notification.getValue().onDestroy())
-      .build();
+    private final Cache<Id, AggregateActor<A, C>> cache = CacheBuilder.newBuilder()
+            .expireAfterAccess(Duration.ofMinutes(10))
+            .removalListener((RemovalListener<Id, AggregateActor<A, C>>) notification -> notification.getValue().onDestroy())
+            .build();
 
 
-  private final CommandHandler<A, C> commandHandler;
+    private final CommandHandler<A, C> commandHandler;
 
-  private final EventHandler<A> eventHandler;
+    private final EventHandler<A> eventHandler;
 
-  private final Function<Id, A> aggregateFactory;
+    private final Function<Id, A> aggregateFactory;
 
-  private final Function<A, S> stateFactory;
+    private final Function<A, S> stateFactory;
 
-  public AggregateRepositoryImpl(
-      CommandHandler<A, C> commandHandler,
-      EventHandler<A> eventHandler,
-      Function<Id, A> aggregateFactory,
-      Function<A, S> stateFactory
-  ) {
-    this.commandHandler = commandHandler;
-    this.eventHandler = eventHandler;
-    this.aggregateFactory = aggregateFactory;
-    this.stateFactory = stateFactory;
-  }
-
-  private List<? extends DomainEvent> persistAll(Id id, List<? extends DomainEvent> events) {
-    eventSource.updateAndGet(esMap -> {
-      var eventsToStore = Optional.ofNullable(esMap.get(id))
-          .map(es -> Stream.concat(es.stream(), events.stream())
-              .sorted(Comparator.comparing(DomainEvent::createdAt))
-              .collect(toList()))
-          .orElse((List<DomainEvent>) events);
-      esMap.put(id, eventsToStore);
-      return esMap;
-    });
-    return events;
-  }
-
-  private Mono<AggregateActor<A, C>> getAggregate(Id id) {
-    return Mono.just(id)
-        .map(this::getFromCache);
-  }
-
-  private AggregateActor<A, C> getFromCache(Id id) {
-    try {
-      return cache.get(id, () ->
-          new AggregateActorImpl<A, C>(
-              id,
-              commandHandler,
-              eventHandler,
-              aggregateFactory,
-              Optional.ofNullable(eventSource.get().get(id)).orElseGet(List::of),
-              this::persistAll));
-    } catch (Exception e) {
-      throw new RuntimeException(e);
+    public AggregateRepositoryImpl(
+            CommandHandler<A, C> commandHandler,
+            EventHandler<A> eventHandler,
+            Function<Id, A> aggregateFactory,
+            Function<A, S> stateFactory
+    ) {
+        this.commandHandler = commandHandler;
+        this.eventHandler = eventHandler;
+        this.aggregateFactory = aggregateFactory;
+        this.stateFactory = stateFactory;
     }
-  }
 
-  @Override
-  public Mono<CommandResult> execute(C cmd, Id aggregateId) {
-    return getAggregate(aggregateId)
-        .flatMap(a -> a.execute(cmd));
-  }
+    private List<? extends DomainEvent> persistAll(Id id, List<? extends DomainEvent> events) {
+        eventSource.updateAndGet(esMap -> {
+            var eventsToStore = Optional.ofNullable(esMap.get(id))
+                    .map(es -> Stream.concat(es.stream(), events.stream())
+                            .sorted(Comparator.comparing(DomainEvent::createdAt))
+                            .collect(toList()))
+                    .orElse((List<DomainEvent>) events);
+            esMap.put(id, eventsToStore);
+            return esMap;
+        });
+        return events;
+    }
 
-  @Override
-  public Mono<S> findById(Id id) {
-    return getAggregate(id).flatMap(a -> a.getState(this.stateFactory));
-  }
+    private Mono<AggregateActor<A, C>> getAggregate(Id id) {
+        return Mono.just(id)
+                .map(this::getFromCache);
+    }
 
-  @Override
-  public Mono<S> findIfExists(Id id) {
-    return Mono.just(id)
-        .flatMap(i -> Optional.ofNullable(cache.getIfPresent(i))
-            .map(a -> a.getState(this.stateFactory))
-            .orElseGet(Mono::empty));
-  }
+    private AggregateActor<A, C> getFromCache(Id id) {
+        try {
+            return cache.get(id, () ->
+                    new AggregateActorImpl<A, C>(
+                            id,
+                            commandHandler,
+                            eventHandler,
+                            aggregateFactory,
+                            Optional.ofNullable(eventSource.get().get(id)).orElseGet(List::of),
+                            this::persistAll
+                    )
+            );
+        } catch (Exception e) {
+            throw new RuntimeException(e);
+        }
+    }
+
+    @Override
+    public Mono<CommandResult> execute(C cmd, Id aggregateId) {
+        return getAggregate(aggregateId)
+                .flatMap(a -> a.execute(cmd));
+    }
+
+    @Override
+    public Mono<S> findById(Id id) {
+        return getAggregate(id).flatMap(a -> a.getState(this.stateFactory));
+    }
+
+    @Override
+    public Mono<S> findIfExists(Id id) {
+        return Mono.just(id)
+                .flatMap(i -> Optional.ofNullable(cache.getIfPresent(i))
+                        .map(a -> a.getState(this.stateFactory))
+                        .orElseGet(Mono::empty)
+                );
+    }
 
 }