com.speedment.runtime.core.manager.Persister Maven / Gradle / Ivy
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/*
*
* Copyright (c) 2006-2019, Speedment, Inc. 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 com.speedment.runtime.core.manager;
import com.speedment.runtime.core.exception.SpeedmentException;
import java.util.function.Consumer;
import java.util.function.UnaryOperator;
/**
* An action that takes an entity and persists it to a data store. This
* interface extends the standard {@code UnaryOperator}- and
* {@code Consumer}-interfaces so that it can be used inside a {@code Stream}.
*
* @param the entity type
*
* @author Per Minborg
* @since 3.0.1
*/
@FunctionalInterface
public interface Persister extends UnaryOperator, Consumer {
/**
* Persists the provided entity to the underlying database and returns a
* potentially updated entity. If the persistence fails for any reason, an
* unchecked {@link SpeedmentException} is thrown.
*
* It is unspecified if the returned updated entity is the same provided
* entity instance or another entity instance. It is erroneous to assume
* either, so you should use only the returned entity after the method has
* been called. However, it is guaranteed that the provided entity is
* untouched if an exception is thrown.
*
* The fields of returned entity instance may differ from the provided
* entity fields due to auto generated column(s) or because of any other
* modification that the underlying database imposed on the persisted
* entity.
*
* @param entity to persist
* @return an entity reflecting the result of the persisted entity
*
* @throws SpeedmentException if the underlying database throws an exception
* (e.g. SQLException)
*/
@Override
ENTITY apply(ENTITY entity) throws SpeedmentException;
/**
* Persists the entity in the data store. The specified instance might be
* modified by this method in some implementations.
*
* @param entity the entity to persist
*
* @throws SpeedmentException if persisting the entity failed
*/
@Override
default void accept(ENTITY entity) {
apply(entity);
}
}