spring ConnectionAccessor 源码
spring ConnectionAccessor 代码
文件路径：/spring-r2dbc/src/main/java/org/springframework/r2dbc/core/ConnectionAccessor.java
/*
* Copyright 2002-2020 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.core;
import java.util.function.Function;
import io.r2dbc.spi.Connection;
import reactor.core.publisher.Flux;
import reactor.core.publisher.Mono;
import org.springframework.dao.DataAccessException;
/**
* Interface declaring methods that accept callback {@link Function}
* to operate within the scope of a {@link Connection}.
* Callback functions operate on a provided connection and must not
* close the connection as the connections may be pooled or be
* subject to other kinds of resource management.
*
* <p> Callback functions are responsible for creating a
* {@link org.reactivestreams.Publisher} that defines the scope of how
* long the allocated {@link Connection} is valid. Connections are
* released after the publisher terminates.
*
* @author Mark Paluch
* @since 5.3
*/
public interface ConnectionAccessor {
/**
* Execute a callback {@link Function} within a {@link Connection} scope.
* The function is responsible for creating a {@link Mono}. The connection
* is released after the {@link Mono} terminates (or the subscription
* is cancelled). Connection resources must not be passed outside the
* {@link Function} closure, otherwise resources may get defunct.
* @param action the callback object that specifies the connection action
* @return the resulting {@link Mono}
*/
<T> Mono<T> inConnection(Function<Connection, Mono<T>> action) throws DataAccessException;
/**
* Execute a callback {@link Function} within a {@link Connection} scope.
* The function is responsible for creating a {@link Flux}. The connection
* is released after the {@link Flux} terminates (or the subscription
* is cancelled). Connection resources must not be passed outside the
* {@link Function} closure, otherwise resources may get defunct.
* @param action the callback object that specifies the connection action
* @return the resulting {@link Flux}
*/
<T> Flux<T> inConnectionMany(Function<Connection, Flux<T>> action) throws DataAccessException;
}
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