聊聊Spring Data Auditable接口的变化

序

本文主要研究一下Spring Data Auditable接口的变化

1.12.8.RELEASE版本

spring-data-commons-1.12.8.RELEASE-sources.jar!/org/springframework/data/domain/Auditable.java

import java.io.Serializable;

import org.joda.time.DateTime;

/**
 * Interface for auditable entities. Allows storing and retrieving creation and modification information. The changing
 * instance (typically some user) is to be defined by a generics definition.
 * 
 * @param  the auditing type. Typically some kind of user.
 * @param  the type of the audited type's identifier
 * @author Oliver Gierke
 */
public interface Auditable extends Persistable {

    /**
     * Returns the user who created this entity.
     * 
     * @return the createdBy
     */
    U getCreatedBy();

    /**
     * Sets the user who created this entity.
     * 
     * @param createdBy the creating entity to set
     */
    void setCreatedBy(final U createdBy);

    /**
     * Returns the creation date of the entity.
     * 
     * @return the createdDate
     */
    DateTime getCreatedDate();

    /**
     * Sets the creation date of the entity.
     * 
     * @param creationDate the creation date to set
     */
    void setCreatedDate(final DateTime creationDate);

    /**
     * Returns the user who modified the entity lastly.
     * 
     * @return the lastModifiedBy
     */
    U getLastModifiedBy();

    /**
     * Sets the user who modified the entity lastly.
     * 
     * @param lastModifiedBy the last modifying entity to set
     */
    void setLastModifiedBy(final U lastModifiedBy);

    /**
     * Returns the date of the last modification.
     * 
     * @return the lastModifiedDate
     */
    DateTime getLastModifiedDate();

    /**
     * Sets the date of the last modification.
     * 
     * @param lastModifiedDate the date of the last modification to set
     */
    void setLastModifiedDate(final DateTime lastModifiedDate);
}

可以看到这个版本使用的joda-time的DateTime

2.0.7.RELEASE版本

spring-data-commons-2.0.7.RELEASE-sources.jar!/org/springframework/data/domain/Auditable.java

/**
 * Interface for auditable entities. Allows storing and retrieving creation and modification information. The changing
 * instance (typically some user) is to be defined by a generics definition.
 * 
 * @param  the auditing type. Typically some kind of user.
 * @param  the type of the audited type's identifier
 * @author Oliver Gierke
 */
public interface Auditable extends Persistable {

    /**
     * Returns the user who created this entity.
     * 
     * @return the createdBy
     */
    Optional getCreatedBy();

    /**
     * Sets the user who created this entity.
     * 
     * @param createdBy the creating entity to set
     */
    void setCreatedBy(U createdBy);

    /**
     * Returns the creation date of the entity.
     * 
     * @return the createdDate
     */
    Optional getCreatedDate();

    /**
     * Sets the creation date of the entity.
     * 
     * @param creationDate the creation date to set
     */
    void setCreatedDate(T creationDate);

    /**
     * Returns the user who modified the entity lastly.
     * 
     * @return the lastModifiedBy
     */
    Optional getLastModifiedBy();

    /**
     * Sets the user who modified the entity lastly.
     * 
     * @param lastModifiedBy the last modifying entity to set
     */
    void setLastModifiedBy(U lastModifiedBy);

    /**
     * Returns the date of the last modification.
     * 
     * @return the lastModifiedDate
     */
    Optional getLastModifiedDate();

    /**
     * Sets the date of the last modification.
     * 
     * @param lastModifiedDate the date of the last modification to set
     */
    void setLastModifiedDate(T lastModifiedDate);
}

可以看到新版版本，去掉了强制依赖joda-time，改为在接口定义新增泛型来表达，该泛型要求实现TemporalAccessor接口
另外，返回值的类型都改为了Optional

小结

新版的Auditable主要有两个比较大的变动：

• 时间类型改为泛型定义，要求具体类型实现TemporalAccessor接口
• 返回值统一返回Optional类型

doc

• 3.9. Auditing