/
ConfigurationScopeAwareProvider.java
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/
ConfigurationScopeAwareProvider.java
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/*
* Copyright (c) 2010-2018. Axon Framework
*
* 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 org.axonframework.config;
import org.axonframework.commandhandling.model.Repository;
import org.axonframework.common.Assert;
import org.axonframework.eventhandling.saga.AbstractSagaManager;
import org.axonframework.messaging.ScopeAware;
import org.axonframework.messaging.ScopeAwareProvider;
import org.axonframework.messaging.ScopeDescriptor;
import java.util.ArrayList;
import java.util.List;
import java.util.function.Function;
import java.util.stream.Stream;
import static java.util.stream.Collectors.toList;
/**
* Implementation of the {@link ScopeAwareProvider} which will retrieve a {@link List} of {@link ScopeAware} components
* in a lazy manner. It does this by pulling these components from the provided {@link Configuration} as soon as
* {@link #provideScopeAwareStream(ScopeDescriptor)} is called.
*
* @author Steven van Beelen
* @author Rob van der Linden Vooren
* @since 3.3
*/
public class ConfigurationScopeAwareProvider implements ScopeAwareProvider {
private final Configuration configuration;
private List<ScopeAware> scopeAwareComponents;
/**
* Instantiate a lazy {@link ScopeAwareProvider} with the given {@code configuration} parameter.
*
* @param configuration a {@link Configuration} used to retrieve {@link ScopeAware} components from
* @throws IllegalArgumentException when {@code configuration} is {@code null}
*/
public ConfigurationScopeAwareProvider(Configuration configuration) {
this.configuration = Assert.nonNull(configuration, () -> "configuration may not be null");
}
@Override
public Stream<ScopeAware> provideScopeAwareStream(ScopeDescriptor scopeDescriptor) {
if (scopeAwareComponents == null) {
scopeAwareComponents = retrieveScopeAwareComponents();
}
return scopeAwareComponents.stream();
}
private List<ScopeAware> retrieveScopeAwareComponents() {
List<ScopeAware> components = new ArrayList<>();
components.addAll(retrieveAggregateRepositories());
components.addAll(retrieveSagaManagers());
return components;
}
private List<Repository> retrieveAggregateRepositories() {
return configuration.findModules(AggregateConfiguration.class).stream()
.map((Function<AggregateConfiguration, Repository>) AggregateConfiguration::repository)
.collect(toList());
}
private List<AbstractSagaManager> retrieveSagaManagers() {
return configuration.eventProcessingConfiguration()
.sagaConfigurations()
.stream()
.map(SagaConfiguration::manager)
.collect(toList());
}
}