GWT RequestFactory和多个请求 [英] GWT RequestFactory and multiple requests

问题描述

有没有一种方法可以使用RequestFactory在单个请求中创建两个实体？我尝试过：

Is there a way to use RequestFactory to create two entities in a single request? I tried:

    EmployeeRequest request = requestFactory.employeeRequest();
    EmployeeProxy newEmployee = request.create(EmployeeProxy.class);
    newEmployee.setName("Joe!");

    Request<Void> createReq = request.persist().using(newEmployee);
    createReq.fire();

    EmployeeProxy newEmployee2 = request.create(EmployeeProxy.class);
    newEmployee2.setName("Sam!");

    Request<Void> createReq2 = request.persist().using(newEmployee2);
    createReq2.fire();

但是我得到一个错误，请求已经在进行中。当我做了两个独立的EmployeeRequests：

But I get an error that a request is already in progress. When I made two separate EmployeeRequests:

    EmployeeRequest request = requestFactory.employeeRequest();
    EmployeeProxy newEmployee = request.create(EmployeeProxy.class);
    newEmployee.setName("Joe!");

    Request<Void> createReq = request.persist().using(newEmployee);
    createReq.fire();

    EmployeeRequest request2 = requestFactory.employeeRequest();
    EmployeeProxy newEmployee2 = request2.create(EmployeeProxy.class);
    newEmployee2.setName("Sam!");

    Request<Void> createReq2 = request2.persist().using(newEmployee2);
    createReq2.fire();

然后从浏览器发出两个不同的请求。我希望RequestFactory中的某些东西可以合并多个请求 - 我必须一次创建数百个实体，而且我不想提出数百个请求！

Then two separate requests are made from the browser. I'm hoping that something in the RequestFactory can merge multiple requests - I have to create hundreds of entities at a time, and I don't want to make hundreds of requests!

推荐答案

是的，这是可能的。在你的第一个例子中，只需删除行

Yes, it's possible. In your first example, just remove the line

createReq.fire();

当您调用 createReq2.fire（）最后，GWT会在一个请求中发送newEmployee和newEmployee2（因为它们都保留在EmployeeRequest request >的上下文中）。我个人发现语义有点奇怪，但这只是我的看法。

When you call createReq2.fire() at the end, then GWT sends both newEmployee and newEmployee2 in one single request (because they were both persisted in the context of your EmployeeRequest "request"). I personally find the semantics a bit strange, but that's just my opinion.

Riley的附录：
以下语法等同，更直观：

Addendum by Riley: The following syntax is equivalent and is much more intuitive:

    EmployeeRequest request = requestFactory.employeeRequest();
    EmployeeProxy newEmployee = request.create(EmployeeProxy.class);
    newEmployee.setName("Joe!");

    request.persist().using(newEmployee);

    EmployeeProxy newEmployee2 = request.create(EmployeeProxy.class);
    newEmployee2.setName("Sam!");

    request.persist().using(newEmployee2);
    request.fire();

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