Monday, July 30, 2007

Spring HTTP Remoting - How ?

preface:
Spring give us few ways to communicate between client and server.
One of these ways is by using http remoting.
Http remoting is a way to invoke remote methods on server.
Spring http remoting uses Http protocol in order to achive that goal.

When do we need it?
When we want our server to expose services to clients.
say we want to expose service who gives us collection of some application users.

How we do it?
Server will expose service using simple independent interface:
public interface userService{
public Collection getAllUsers();
}

As you can see the interface can be independent, and no need to extend from nothing.

Then, we will implement this interface:
public class UserServiceImpl implements UserService{
public Collection getAllUsers() {
//do implementation...
}
}

Client - need to have only the interface in its class path.
Serevr - need to have both interface and implementing class in its classpath.

So, client is unknow with the implementation, only with the interface - like we wish for.

In order to make it work, we will use Spring HTTP Remoting.
Spring Http remoting uses the standard Java serialization mechanism to expose services through HTTP.

Exposing server service:
first, we will create simple bean using spring. the bean will be the service implementation:
< id="userService" class="example.UserServiceImpl">

then, we will expose the service with name "/UserService">
< name="">/UserService"
class="org.springframework.remoting.httpinvoker.HttpInvokerServiceExporter">
< name="service" ref="userService">
< name="serviceInterface" value="example.UserService">
< /bean >

Configuration of web.xml (only once for all services):
< /servlet &gt
< servlet-name &gt remoting < / servlet-name &gt
< servlet-class &gt org.springframework.web.servlet.DispatcherServlet < / servlet-class &gt
< /servlet >

<>
remoting < / servlet-name >
/remoting/* < /url-pattern >
< /servlet-mapping >


Linking the service at the client side:
< id="">userServiceProxy"
class="org.springframework.remoting.httpinvoker.HttpInvokerProxyFactoryBean" >
< name="serviceUrl" value="">/UserService"/ >
< name="serviceInterface" value="">UserService"/ >
< /bean >

Then, in order to invoke service:
UserService service = (UserService) appContext.getBean("userServiceProxy");
Collection allUsers = service.getAllUsers();


And.. thats it. service will be invoked on server and client will get the results.

So, how it works ?


  1. The userServiceProxy bean that we created is a proxy.
  2. When method is being called, the proxy takes the method and its arguments and creates org.springframework.remoting.support.RemoteInvocation object. this object holds the information about the method invoked, like method name and which arguments given to method (and more).
  3. The RemoteInvocation object is serialiezed and pushed into an http request to url we declared in "serviceUrl" property of proxy ("http://host:8080/remoting/UserService").
  4. When request reachs server, the url is mapped by us in web.xml and will be dispatch to a spring servlet.
  5. The RemoteInvocation object is deserialized, and by using reflaction the method is being executed - on server.
  6. Then org.springframework.remoting.support.RemoteInvocationResult object will be created. this object will hold the result of execution or the exception if accured.
  7. The RemoteInvocationResult object will serialized and phushed into an HTTP response.
  8. Client will get the response, and will deserialize RemoteInvocationResult object.
  9. If the RemoteInvocationResult object holds an exception - it will be thrown, else the value of method will be returned.

So as you can see, using Spring http is very easy to use and to understand. spring give us a way to make remote invocation transparent for us, and we can use services as they were on our client.

This mechanism can be extended and give us more abilities, like adding attributes on request and so on... i hope i will find the time to represent these abilities in the near futher.

36 comments:

Mittal said...

Is there a assumption - that all clients shall be using spring ?

What about clients that don't use spring - how would they invoke this service and how about example of service accepting some params simple as well complex types ?

Senior Java Developer said...

Hi,

Client cannot invoke services without using spring.
but, they dont have to use xml for creating a service bean.
all they need to do is to create an object typed org.springframework.remoting.httpinvoker.HttpInvokerProxyFactoryBean and set two properties:"serviceUrl" and "serviceInterface" .

Service can accepts many params as you wish. simple or complex, as long as all object are Serializable.

I think that example of this kind of services is not needed, because eventually all kind of methods can apply just as you will do it if the interface and implementation where in same jvm. the only restriction is all objects need to be Serializable.

Sriram said...

Spring documentation says it uses standard java serialization to serialize and de-serialize objects. So, if there are any custom objects (like domain objects or value objects) are passed as arguments or return parameters, the version of the objects should match between both caller and the server?

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Uncountable online casinos contract or augmentation their software from companies like Microgaming, Realtime Gaming, Playtech, Supranational Execute the obligatory Technology and CryptoLogic Inc.

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