package com.ankurm.hibernatedemo.proxy;

import jakarta.persistence.EntityManager;
import jakarta.persistence.PersistenceContext;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

/**
 * Test-only support for docs/11-proxies-and-lazy-initialization.md's OSIV chapter (OsivMaskingTest). Deliberately
 * uses the container-managed, request/transaction-synchronized {@link EntityManager} (via
 * {@code @PersistenceContext}), not a manually created one -- open-in-view only has anything
 * to bind to the request thread when the shared, Spring-managed EntityManager is the one in
 * play.
 */
@Service
public class OsivBookService {

    @PersistenceContext
    private EntityManager entityManager;

    @Transactional(readOnly = true)
    public ProxyBook findBook(Long id) {
        // Deliberately does NOT touch getReviews() here -- whether that succeeds later, during
        // JSON serialization in the web layer, is exactly the thing under test.
        return entityManager.find(ProxyBook.class, id);
    }
}