https://github.com/daggerok/spring-data-java8

Java 8 CompletableFuture, Stream API return types for spring-data repositories
https://github.com/daggerok/spring-data-java8

completable-future completablefuture spring-data-java8 spring-data-jpa stream stream-api streamable

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Java 8 CompletableFuture, Stream API return types for spring-data repositories

• Host: GitHub
• URL: https://github.com/daggerok/spring-data-java8
• Owner: daggerok
• Created: 2019-03-16T11:50:23.000Z (almost 7 years ago)
• Default Branch: master
• Last Pushed: 2019-03-16T11:54:09.000Z (almost 7 years ago)
• Last Synced: 2025-01-10T00:41:55.240Z (about 1 year ago)
• Topics: completable-future, completablefuture, spring-data-java8, spring-data-jpa, stream, stream-api, streamable
• Language: Java
• Size: 51.8 KB
• Stars: 2
• Watchers: 3
• Forks: 1
• Open Issues: 0
• Metadata Files:
  • Readme: README.md

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README

          
# spring-data-java8

Java 8 CompletableFuture, Stream API return types for spring-data (JPA) repositories

```java

@Repository

interface MessageRepository extends JpaRepository {

  Streamable streamAllBy();

  /*

     must be executed inside transaction, otherwise you will get this error:

     org.springframework.dao.InvalidDataAccessApiUsageException: You're trying to execute a streaming

     query method without a surrounding transaction that keeps the connection open so that the Stream can

     actually be consumed. Make sure the code consuming the stream uses @Transactional or any other way of

     declaring a (read-only) transaction.

     you can use TransactionTemplate for that, like so:

     return transactionTemplate.execute(status -> {

       try (Stream stream = messageRepository.findAnyBy()) {

         return stream.collect(toList());

       }

     });

  */

  Stream findAnyBy();

  /*

     you may want to configure and use custom taskExecutor:

     @Bean

     @Qualifier("myFutures")

     public TaskExecutor taskExecutor() {

       return new SimpleAsyncTaskExecutor("my-futures");

     }

  */

  @Async("myFutures")

  CompletableFuture> findAllBy();

}

```

links:

- [read more](https://docs.spring.io/spring-data/data-jpa/docs/2.2.x/reference/html)