Objectify查询结果和数据存储区查看器结果的不一致问题？

Question

我正在编写一个基于TodoMVC angularjs(http://todomvc.com/)的示例项目和一个带有Google App Engine Cloud Endpoint的后端api,我在从App Engine数据存储区获取todos监听时有一些一致性结果.

Todo对象使用objectify存储在App Engine数据存储区中.

Todo实体的编码如下:

@Entity
public class Todo {

    @Id
    private Long id;
    private String title;
    private boolean completed;
    private Date lastEdit;

    @Index
    private Long userId;

    public Todo() {
    }

    public Todo(String title, boolean completed) {
        this.title = title;
        this.completed = completed;
    }

    public Todo(Long id, String title, boolean completed) {
        this.id = id;
        this.title = title;
        this.completed = completed;
    }

    public Long getId() {
        return id;
    }

    public void setId(Long id) {
        this.id = id;
    }

    public String getTitle() {
        return title;
    }

    public void setTitle(String title) {
        this.title = title;
    }

    public boolean isCompleted() {
        return completed;
    }

    public void setCompleted(boolean completed) {
        this.completed = completed;
    }

    public Long getUserId() {
        return userId;
    }

    public void setUserId(Long userId) {
        this.userId = userId;
    }

    public Date getLastEdit() {
        return lastEdit;
    }

    public void setLastEdit(Date lastEdit) {
        this.lastEdit = lastEdit;
    }

    @Override
    public String toString() {
        return "Todo{" +
                "id=" + id +
                ", title='" + title + '\'' +
                ", completed=" + completed +
                ", lastEdit=" + lastEdit +
                ", userId='" + userId + '\'' +
                '}';
    }
}

在数据存储区中保存Todo的过程如下:

@ApiMethod(name = "create", httpMethod =  ApiMethod.HttpMethod.POST)
public Todo create(User user, Todo todo) {
    logger.info("creating todo : " + todo.toString());

    todo.setUserId(new Long(user.getUserId()));
    todo.setLastEdit(new Date());
    ofy().save().entity(todo).now();

    return todo;
}



@ApiMethod(name = "list", httpMethod =  ApiMethod.HttpMethod.GET)
public Collection<Todo> getTodos(User user) {
    logger.info("user:" + user);

    List<Todo> todos = null;

    if (user != null) {
        todos = ofy().consistency(ReadPolicy.Consistency.STRONG).load().type(Todo.class).filter("userId", new Long(user.getUserId())).list();
    }

    logger.info("todos:" + todos);

    return todos;
}

假设我的列表中有4个待办事项,我将所有这些都设置为已完成(已完成= true).我在Datastore查看器中检查它们的状态:

然后,如果我在出现奇怪的一致性问题几秒后请求列表:

2014-03-08 13:08:43.326
fr.xebia.gae.todo.api.TodoEndpointV2 getTodos: todos:[
Todo{id=5639274879778816, title='vélo', completed=false, lastEdit=Fri Mar 07 23:36:08 UTC 2014, userId='104955400895435072612'}, 
Todo{id=5676830073815040, title='train', completed=true, lastEdit=Sat Mar 08 12:08:30 UTC 2014, userId='104955400895435072612'}, 
Todo{id=5717271485874176, title='avion', completed=false, lastEdit=Fri Mar 07 23:36:09 UTC 2014, userId='104955400895435072612'}, 
Todo{id=5757334940811264, title='voiture', completed=true, lastEdit=Sat Mar 08 12:08:32 UTC 2014, userId='104955400895435072612'}]

正如您所看到的,对于所有待办事项,已完成的值未设置为true,并且它们的lastEdit日期甚至未更新

2分钟后的新请求:

2014-03-08 13:10:20.612
fr.xebia.gae.todo.api.TodoEndpointV2 getTodos: todos:[
Todo{id=5639274879778816, title='vélo', completed=false, lastEdit=Fri Mar 07 23:36:08 UTC 2014, userId='104955400895435072612'}, 
Todo{id=5676830073815040, title='train', completed=true, lastEdit=Sat Mar 08 12:08:30 UTC 2014, userId='104955400895435072612'}, 
Todo{id=5717271485874176, title='avion', completed=false, lastEdit=Fri Mar 07 23:36:09 UTC 2014, userId='104955400895435072612'}, 
Todo{id=5757334940811264, title='voiture', completed=true, lastEdit=Sat Mar 08 12:08:32 UTC 2014, userId='104955400895435072612'}]

和17分钟后的新请求,仍然不是很好的价值观......

2014-03-08 13:27:07.918
fr.xebia.gae.todo.api.TodoEndpointV2 getTodos: todos:[Todo{id=5639274879778816, title='vélo', completed=false, lastEdit=Fri Mar 07 23:36:08 UTC 2014, userId='104955400895435072612'}, 
Todo{id=5676830073815040, title='train', completed=true, lastEdit=Sat Mar 08 12:08:30 UTC 2014, userId='104955400895435072612'}, 
Todo{id=5717271485874176, title='avion', completed=false, lastEdit=Fri Mar 07 23:36:09 UTC 2014, userId='104955400895435072612'}, 
Todo{id=5757334940811264, title='voiture', completed=true, lastEdit=Sat Mar 08 12:08:32 UTC 2014, userId='104955400895435072612'}]

有人知道为什么他们在使用Objectify查询的内容与使用GAE数据存储区查看器后台查看的内容之间存在这样的差异吗？是一致性问题吗？但如果是这样,为什么数据存储区查看器没有相同的问题？在查询时我是否滥用了客体化(如果我在运行过滤器时设置了ofy().一致性(ReadPolicy.Consistency.STRONG),那么该事件是什么？)

Answer 1

我没有很好地阅读 objectify 设置，并且错过了它告诉人们应该将以下内容添加到 web.xml 的部分

<filter>
     <filter-name>ObjectifyFilter</filter-name>
     <filter-class>com.googlecode.objectify.ObjectifyFilter</filter-class>
</filter>
<filter-mapping>
     <filter-name>ObjectifyFilter</filter-name>
     <url-pattern>/*</url-pattern> 
</filter-mapping>