spring DefaultFetchSpec 源码
spring DefaultFetchSpec 代码
文件路径：/spring-r2dbc/src/main/java/org/springframework/r2dbc/core/DefaultFetchSpec.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 io.r2dbc.spi.Result;
import org.reactivestreams.Publisher;
import reactor.core.publisher.Flux;
import reactor.core.publisher.Mono;
import org.springframework.dao.IncorrectResultSizeDataAccessException;
/**
* Default {@link FetchSpec} implementation.
*
* @author Mark Paluch
* @since 5.3
* @param <T> the row result type
*/
class DefaultFetchSpec<T> implements FetchSpec<T> {
private final ConnectionAccessor connectionAccessor;
private final String sql;
private final Function<Connection, Flux<Result>> resultFunction;
private final Function<Connection, Mono<Long>> updatedRowsFunction;
private final Function<Result, Publisher<T>> resultAdapter;
DefaultFetchSpec(ConnectionAccessor connectionAccessor, String sql,
Function<Connection, Flux<Result>> resultFunction,
Function<Connection, Mono<Long>> updatedRowsFunction,
Function<Result, Publisher<T>> resultAdapter) {
this.sql = sql;
this.connectionAccessor = connectionAccessor;
this.resultFunction = resultFunction;
this.updatedRowsFunction = updatedRowsFunction;
this.resultAdapter = resultAdapter;
}
@Override
public Mono<T> one() {
return all().buffer(2)
.flatMap(list -> {
if (list.isEmpty()) {
return Mono.empty();
}
if (list.size() > 1) {
return Mono.error(new IncorrectResultSizeDataAccessException(
String.format("Query [%s] returned non unique result.", this.sql),
1));
}
return Mono.just(list.get(0));
}).next();
}
@Override
public Mono<T> first() {
return all().next();
}
@Override
public Flux<T> all() {
return this.connectionAccessor.inConnectionMany(new ConnectionFunction<>(this.sql,
connection -> this.resultFunction.apply(connection)
.flatMap(this.resultAdapter)));
}
@Override
public Mono<Long> rowsUpdated() {
return this.connectionAccessor.inConnection(this.updatedRowsFunction);
}
}
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