Auditing entities in Spring Data MongoDB

もっと読む
Spring Data MongoDB 1.2.0 silently introduced new feature:support for baic audiiting.Because you will not find too much about it in offical reference in this post I will show ahat benefits does it bring,how to configre Spring for auding and how to annotate your document to make the make aditing.Auditing. let you declarabiely tell Spring to store:

date when document has been created: @CreatedDate

date when document has been udated last time: @LastModified Date

user who has created document: @CreatedBy

user who has done most recent udate: @LastModifieBy

current document version: @Version

Configration
First of all Maven dependencies to latest Spring Data MongoDB and Spring Data Comons.Additionally in order to use date-related audit annotations we need to add jda-time トクラスパス.

    org.springframework.data
    spring-data-mongodb
    1.2.1.RELEASE

 

    org.springframework.data
    spring-data-commons
    1.5.1.RELEASE

 

    joda-time
    joda-time
    2.2

 In order to enable auditing we need to add  トSpring configration.Currenntly there isのway to configre it through Java Config.

Usage
Configration above provides us way for auditing that includes versioning and timestamps.Example document will look like: 

@Document
public class Item {
    @Id
    private String id;
    @Version
    private Long version;
    @CreatedDate
    private DateTime createdAt;
    @LastModifiedDate
    private DateTime lastModified;
    ...
}

Now you can save document using Mongo Template or your repository and all annotated fields are atomagically set.
As YOU have probably noticed I did not use here user related annotations @CreatedBy and @LastModifieBy.In order to use them we need to tell Spring who is a current user.
First add user related fields to your audited class:

@CreatedBy
private String createdBy;
@LastModifiedBy
private String lastModifiedBy;

The n create your implemention of Auditor Aware that will obtain current user(probably from session or Spring Security context–depends on your appication):

public class MyAppAuditor implements AuditorAware {
    @Override
    public String getCurrentAuditor() {
        // get your user name here
        return "John Doe";
    }
}

Last thing is to tell Spring Data MongoDB about this auditor aware class by little modification in Mongo configration:
 

 
udateの場合はトリガされないようですが、saveの場合はトリガされます.この場合はmongo Template.save(S entity)を使用して、データが存在する場合は修正操作が実行されます.