英文:
Are Spliterators from Iterable results from Spring JPA safe to use in parallelStream
问题
与https://stackoverflow.com/questions/63469182/are-parallelstreams-on-onetomany-collections-safe 类似，但我的问题特定于Spring JPA Repository查询的结果，例如：
public interface Students extends JpaRepository<Student, UUID> {
@EntityGraph("Student.withProgramAndSchedule")
@Query("from Student s")
Iterable<Student> findAllWithProgramAndSchedule();
}
我能安全地在并行情况下使用它吗？例如：
StreamSupport.stream(students.findAllWithProgramAndSchedule().spliterator(), true)
英文:
Similar to https://stackoverflow.com/questions/63469182/are-parallelstreams-on-onetomany-collections-safe but my question is specific to the result from a Spring JPA Repository query e.g.
public interface Students extends JpaRepository<Student, UUID> {
@EntityGraph("Student.withProgramAndSchedule")
@Query("from Student s")
Iterable<Student> findAllWithProgramAndSchedule();
}
Can I safely use it with parallel? e.g.
StreamSupport.stream(students.findAllWithProgramAndSchedule().spliterator(), true)
答案1
得分: 3
JPA实体管理器及其管理的实体不是线程安全的。
可以这样思考，students.findAllWithProgramAndSchedule() 可能会触发延迟加载。在底层，这将使用不是线程安全的JDBC连接，因此 students.findAllWithProgramAndSchedule() 不能是线程安全的。
英文:
JPA entity managers and the entities they manage are not thread safe.
One way to think about it is that students.findAllWithProgramAndSchedule() might trigger a lazy load. Under the hood this will use a JDBC connection which itself is not thread safe, therefore the students.findAllWithProgramAndSchedule() can't be thread safe.
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