java - 为同一个 Hibernate 二级缓存区域映射两个 CacheConcurrencyStrategy

Question

我为单个区域设置了不同的缓存策略，例如“读写”和“只读”用法，当我尝试更新 Carro 实体时，抛出了以下异常:

错误 org.hibernate.internal.SessionImpl - HHH000346:托管刷新期间出错 [无法写入只读对象]

线程“main”中的异常 java.lang.UnsupportedOperationException:无法写入只读对象

如果我在不同的地区分开实体工作。那么，不能在同一个区域有两种不同类型的策略吗？

Ps.: 也收到这个警告:HHH020007: read-only cache configured for mutable entity

---

->卡罗:

@Entity
@Table(name = "carro")
@Cache(usage = CacheConcurrencyStrategy.NONSTRICT_READ_WRITE, region = "myregion")
public class Carro implements Serializable
{ 
     private static final long serialVersionUID = 8467432396096896736L;

     @Id
     @Column(name = "id")
     private Integer id;

     @Column(name = "carro")
     private String carro;

     @OneToMany(mappedBy = "carro", fetch = FetchType.LAZY)
     private List<Pessoa> pessoas = new ArrayList<Pessoa>();
}

-> 佩索阿:

@Entity
@Table(name = "pessoa")
@Cache(usage = CacheConcurrencyStrategy.READ_ONLY, region = "myregion")
public class Pessoa implements Serializable
{
    private static final long serialVersionUID = 8467432396096896736L;

    @Id
    @Column(name = "id")
    private Integer id;

    @Column(name = "nome")
    private String Nome;

    @Column(name = "sexo")
    private String sexo;

    @Column(name = "idade")
    private Integer idade;

    @ManyToOne(fetch = FetchType.LAZY)
    @JoinColumn(name = "carro_id")
    private Carro carro;
}

->ehcache.xml:

<ehcache xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:noNamespaceSchemaLocation="ehcache.xsd" updateCheck="false"
         monitoring="autodetect" dynamicConfig="true">

    <cache name="myregion" maxEntriesLocalHeap="1000" eternal="false" timeToLiveSeconds="1000">
        <persistence strategy="none"/>
    </cache>

    <cache name="org.hibernate.cache.internal.StandardQueryCache" maxEntriesLocalHeap="1000" eternal="false" timeToLiveSeconds="120">
        <persistence strategy="none"/>
    </cache>

    <cache name="org.hibernate.cache.spi.UpdateTimestampsCache" maxEntriesLocalHeap="1000" eternal="true">
        <persistence strategy="none"/>
    </cache>
</ehcache>

Answer 1

区域必须有一个CacheConcurrencyStrategy。在您的情况下，Pessoa 类必须在 Carro 之后注册，因此 myregion 设置为 READ_ONLY。

默认情况下，每个实体都有不同的区域工厂，因此您可以在每个实体的基础上设置不同的CacheConcurrencyStrategy。