spring DatabasePopulator 源码
spring DatabasePopulator 代码
文件路径：/spring-r2dbc/src/main/java/org/springframework/r2dbc/connection/init/DatabasePopulator.java
/*
* Copyright 2002-2021 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.r2dbc.connection.init;
import io.r2dbc.spi.Connection;
import io.r2dbc.spi.ConnectionFactory;
import reactor.core.publisher.Mono;
import org.springframework.dao.DataAccessException;
import org.springframework.r2dbc.connection.ConnectionFactoryUtils;
import org.springframework.util.Assert;
/**
* Strategy used to populate, initialize, or clean up a database.
*
* @author Mark Paluch
* @author Keith Donald
* @author Sam Brannen
* @since 5.3
* @see ResourceDatabasePopulator
* @see ConnectionFactoryInitializer
*/
@FunctionalInterface
public interface DatabasePopulator {
/**
* Populate, initialize, or clean up the database using the
* provided R2DBC {@link Connection}.
* @param connection the R2DBC connection to use to populate the db;
* already configured and ready to use, must not be {@code null}
* @return {@link Mono} that initiates script execution and is
* notified upon completion
* @throws ScriptException in all other error cases
*/
Mono<Void> populate(Connection connection) throws ScriptException;
/**
* Execute the given {@link DatabasePopulator} against the given {@link ConnectionFactory}.
* @param connectionFactory the {@link ConnectionFactory} to execute against
* @return {@link Mono} that initiates {@link DatabasePopulator#populate(Connection)}
* and is notified upon completion
*/
default Mono<Void> populate(ConnectionFactory connectionFactory) throws DataAccessException {
Assert.notNull(connectionFactory, "ConnectionFactory must not be null");
return Mono.usingWhen(ConnectionFactoryUtils.getConnection(connectionFactory), //
this::populate, //
connection -> ConnectionFactoryUtils.releaseConnection(connection, connectionFactory), //
(connection, err) -> ConnectionFactoryUtils.releaseConnection(connection, connectionFactory),
connection -> ConnectionFactoryUtils.releaseConnection(connection, connectionFactory))
.onErrorMap(ex -> !(ex instanceof ScriptException),
ex -> new UncategorizedScriptException("Failed to execute database script", ex));
}
}
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