spring-data-jpa DefaultJpaContext 源码
spring-data-jpa DefaultJpaContext 代码
文件路径：/spring-data-jpa/src/main/java/org/springframework/data/jpa/repository/support/DefaultJpaContext.java
/*
* Copyright 2015-2022 the original author or authors.
*
* 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
*
* https://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.springframework.data.jpa.repository.support;
import java.util.List;
import java.util.Set;
import jakarta.persistence.EntityManager;
import jakarta.persistence.metamodel.ManagedType;
import org.springframework.data.jpa.repository.JpaContext;
import org.springframework.util.Assert;
import org.springframework.util.LinkedMultiValueMap;
import org.springframework.util.MultiValueMap;
/**
* Default implementation of {@link JpaContext}.
*
* @author Oliver Gierke
* @soundtrack Marcus Miller - Son Of Macbeth (Afrodeezia)
* @since 1.9
*/
public class DefaultJpaContext implements JpaContext {
private final MultiValueMap<Class<?>, EntityManager> entityManagers;
/**
* Creates a new {@link DefaultJpaContext} for the given {@link Set} of {@link EntityManager}s.
*
* @param entityManagers must not be {@literal null}.
*/
public DefaultJpaContext(Set<EntityManager> entityManagers) {
Assert.notNull(entityManagers, "EntityManagers must not be null");
Assert.notEmpty(entityManagers, "EntityManagers must not be empty");
this.entityManagers = new LinkedMultiValueMap<>();
for (EntityManager em : entityManagers) {
for (ManagedType<?> managedType : em.getMetamodel().getManagedTypes()) {
this.entityManagers.add(managedType.getJavaType(), em);
}
}
}
@Override
public EntityManager getEntityManagerByManagedType(Class<?> type) {
Assert.notNull(type, "Type must not be null");
if (!entityManagers.containsKey(type)) {
throw new IllegalArgumentException(String.format("%s is not a managed type", type));
}
List<EntityManager> candidates = this.entityManagers.get(type);
if (candidates.size() == 1) {
return candidates.get(0);
}
throw new IllegalArgumentException(
String.format("%s managed by more than one EntityManagers: %s", type.getName(), candidates));
}
}
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