spring StatementFilterFunction 源码
spring StatementFilterFunction 代码
文件路径：/spring-r2dbc/src/main/java/org/springframework/r2dbc/core/StatementFilterFunction.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 io.r2dbc.spi.Result;
import io.r2dbc.spi.Statement;
import org.reactivestreams.Publisher;
import org.springframework.util.Assert;
/**
* Represents a function that filters an {@link ExecuteFunction execute function}.
*
* <p>The filter is executed when a {@link org.reactivestreams.Subscriber} subscribes
* to the {@link Publisher} returned by the {@link DatabaseClient}.
*
* <p>StatementFilterFunctions are typically used to specify additional details on
* the Statement objects such as {@code fetchSize} or key generation.
*
* @author Mark Paluch
* @author Juergen Hoeller
* @since 5.3
* @see ExecuteFunction
*/
@FunctionalInterface
public interface StatementFilterFunction {
/**
* An empty {@link StatementFilterFunction} that delegates to {@link ExecuteFunction}.
*/
StatementFilterFunction EMPTY_FILTER = (statement, next) -> next.execute(statement);
/**
* Apply this filter to the given {@link Statement} and {@link ExecuteFunction}.
* <p>The given {@link ExecuteFunction} represents the next entity in the chain,
* to be invoked via {@link ExecuteFunction#execute(Statement)} in
* order to proceed with the execution, or not invoked to shortcut the chain.
* @param statement the current {@link Statement}
* @param next the next execute function in the chain
* @return the filtered {@link Result}s.
*/
Publisher<? extends Result> filter(Statement statement, ExecuteFunction next);
/**
* Return a composed filter function that first applies this filter, and then
* applies the given {@code "after"} filter.
* @param afterFilter the filter to apply after this filter
* @return the composed filter.
*/
default StatementFilterFunction andThen(StatementFilterFunction afterFilter) {
Assert.notNull(afterFilter, "StatementFilterFunction must not be null");
return (request, next) -> filter(request, afterRequest -> afterFilter.filter(afterRequest, next));
}
}
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