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Use ReactivePageableExecutionUtils from Spring Data Commons.

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Closes #1946
This commit is contained in:
Mark Paluch
2024-11-21 09:01:51 +01:00
parent 6eed53fd3c
commit 2df8c2fb76
2 changed files with 1 additions and 69 deletions
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69
spring-data-r2dbc/src/main/java/org/springframework/data/r2dbc/repository/support/ReactivePageableExecutionUtils.java
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@@ -1,69 +0,0 @@
/*
* Copyright 2021-2024 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.data.r2dbc.repository.support;
import reactor.core.publisher.Mono;
import java.util.List;
import org.springframework.data.domain.Page;
import org.springframework.data.domain.PageImpl;
import org.springframework.data.domain.Pageable;
import org.springframework.util.Assert;
/**
* Support for query execution using {@link Pageable}. Using {@link ReactivePageableExecutionUtils} assumes that data
* queries are cheaper than {@code COUNT} queries and so some cases can take advantage of optimizations.
*
* @author Mark Paluch
* @since 1.4
*/
abstract class ReactivePageableExecutionUtils {
private ReactivePageableExecutionUtils() {}
/**
* Constructs a {@link Page} based on the given {@code content}, {@link Pageable} and {@link Mono} applying
* optimizations. The construction of {@link Page} omits a count query if the total can be determined based on the
* result size and {@link Pageable}.
*
* @param content must not be {@literal null}.
* @param pageable must not be {@literal null}.
* @param totalSupplier must not be {@literal null}.
* @return the {@link Page}.
*/
public static <T> Mono<Page<T>> getPage(List<T> content, Pageable pageable, Mono<Long> totalSupplier) {
Assert.notNull(content, "Content must not be null");
Assert.notNull(pageable, "Pageable must not be null");
Assert.notNull(totalSupplier, "TotalSupplier must not be null");
if (pageable.isUnpaged() || pageable.getOffset() == 0) {
if (pageable.isUnpaged() || pageable.getPageSize() > content.size()) {
return Mono.just(new PageImpl<>(content, pageable, content.size()));
}
return totalSupplier.map(total -> new PageImpl<>(content, pageable, total));
}
if (!content.isEmpty() && pageable.getPageSize() > content.size()) {
return Mono.just(new PageImpl<>(content, pageable, pageable.getOffset() + content.size()));
}
return totalSupplier.map(total -> new PageImpl<>(content, pageable, total));
}
}

1
spring-data-r2dbc/src/main/java/org/springframework/data/r2dbc/repository/support/SimpleR2dbcRepository.java
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@@ -44,6 +44,7 @@ import org.springframework.data.relational.repository.query.RelationalEntityInfo
import org.springframework.data.relational.repository.query.RelationalExampleMapper;
import org.springframework.data.repository.query.FluentQuery;
import org.springframework.data.repository.reactive.ReactiveSortingRepository;
import org.springframework.data.support.ReactivePageableExecutionUtils;
import org.springframework.data.util.Lazy;
import org.springframework.data.util.Streamable;
import org.springframework.r2dbc.core.DatabaseClient;