FW: FW: [Laszlo-dev] sessionrpc with java bean object in session

Thu Jun 30 16:22:13 PDT 2005

Hi Dzafer,

><javarpc name="jrpcUtil" classname="be.dzafer.handlers.Util_HDLR"
>		scope="session" autoload="true" loadoption="loadcreate"
>		objectreturntype="javabean">
>
>
>After the timeout session, I receive this message error: "could not find
>session instance jrpcUtil"
>So the loadoption="loadcreate" doesn't create a new javarpc ?
>  
>
If your app is still up while the server session times out, invoking a 
javarpc method will result with that message being returned.

>Is there a way to recreate when session lost?
>  
>
If you get that message, you can try calling your javarpc's load() 
method to recreate the server object, like:

   jrpcUtil.load()

Of course, this assumes that the javarpc's loadoption is "loadcreate".

>Is there a way to retrieve an error code instead of a error message to know
>what kind of error has occurred?
>  
>
There aren't any error codes returned today. You can try adding a 
feature request on OpenLaszlo JIRA.

>So what I want to do:
>
>1) Create a bean and put it in session (for example: a javabean that
>contains all information about the logged user. Another example: keep in
>session a list of all connected user)  
>2) Retrieve the bean into my Laszlo page for displaying information and also
>modifying information and put it back into session
>
>So, in one word sharing/modifying information between java
>Servlets/javabeans and the lzx pages. 
>  
>
JavaRPC sets its server session objects in an map that's keyed off 
"__lzobj". So to set a session object on the server, you first must get 
the map like:

  Map map = req.getSession().getAttribute("__lzobj");

and then set your object like:

  map.put("attutil", util_MOD)

You should then be able to retrieve the java from your LZX application:

Note that there's a bug with loadoption="loadonly" so make sure you 
specify "loadcreate" or you'll hit a null pointer exception error. I 
have a fix in my local branch that will should hopefully go in within 
the next week or so.

I've attached a couple of test files. Compile the java files and place 
them in your WEB-INF/classes/examples directory. The sessionjavabean.lzx 
file basically does what your login() call does and myjavabean.lzx gets 
a prototype of the javabean placed in the session called in 
sessionjavabean.lzx.

Let me know how it goes.

pablo

>What have try:
>
>1) Sessionrpc: without success with JavaBeans! Works fine with "String"
>types.
>
>2) Javarpc : 
>
>	A)In a lzx page, the javarpc will instantiated my javabean
>"Util_HDLR"
>
>	<javarpc name="jrpcUtil" classname="be.dzafer.handlers.Util_HDLR"
>		scope="session" autoload="true" loadoption="loadcreate"
>		objectreturntype="javabean">
>		...
>
>
>	B) In the Java Bean I do this :
>
>		public boolean login(String login, String password,
>HttpServletRequest req) {
>
>			boolean logged = false;
>
>			Util_MOD util_MOD = util_FAC.getUser(login,
>passenc);
>
>			if (util_MOD != null) {
>	
>req.getSession().setAttribute("attutil",util_MOD);
>			} else {
>			  ... error ...
>			}
>			...
>				
>	C) In another lzx page I do this to retrieve the info:
>
>		<javarpc name="jrpcAttutil" attributename="attutil"
>        		classname="be.dzafer.models.Util_MOD"
>			scope="session" autoload="false"
>loadoption="loadonly"
>			objectreturntype="javabean">
>		
>			<method event="onerror" args="err">
>				debug.write("errors: "+ err);
>			</method>
>		
>			<method event="onload">
>   		    		debug.write("onload ...");
>				jrpcAttutil.rcutillogin.invoke();
>			</method>
>		
>		
>			<remotecall name="rcutillogin"
>funcname="getUtil_s_login">
>		
>				<method event="ondata" args="bean">
>					Debug.write("rcutillogin ondata:",
>data);
>				</method>
>			</remotecall>
>		</javarpc>
>		
>
>		...
>
>		<button text="getBean"
>					onclick="jrpcAttutil.load();" />
>
>
>	D) error message in debugger : errors: couldn't find session
>instance attutil
>
>
>
>
>So, I really have trouble to share objects between java and Laszlo.
>It's really critical for my project to be able to do that.
> 
>Is there two different sessions, one for the flash client and one for my
>servlets ?
>
>Thanks in advance for your help.
>
>Best regards,
>Dzafer
>
>
>
>
>============================================================================
>============================================================================
>
>
>-----Original Message-----
>From: Pablo Kang [mailto:pkang at laszlosystems.com] 
>Sent: Friday, June 24, 2005 8:22 PM
>To: dzafer
>Cc: laszlo-dev at openlaszlo.org
>Subject: Re: [Laszlo-dev] sessionrpc with java bean object in session
>
>Is idDset empty after ondata? In the debugger, can you type 
>idDset.childNodes[0] and tell me what you see?
>
>pablo
>
>dzafer wrote:
>
>  
>
>>Hi all,
>>
>>Try to use "sessionrpc" to retrieve a java bean object in session.
>>
>>---------------------------------------------
>>java:
>>
>>class: be.dzafer.models.Util_MOD
>>
>>.
>>req.getSession ().setAttribute ("attUtil", util_MOD);
>>---------------------------------------------
>>
>>
>>---------------------------------------------
>>Lzx:
>>
>><dataset name="idDset" />
>>
>><sessionrpc id="sessmenu" autoload="true">
>>
>><remotecall name="getAttUtil" funcname="getAttribute" 
>>dataobject="idDset" >
>><param value="'attUtil'" />
>>
>><method event="ondata" args="data">
>>Debug.write("default ondata:", data);
>></method>
>>
>></remotecall>
>>
>></sessionrpc>
>>---------------------------------------------
>>
>>---------------------------------------------
>>Result:
>>
>>default ondata: <object#0| {class: be.dzafer.models.Util_MOD}>
>>---------------------------------------------
>>
>>
>>How can I manipulate this java object to retrieve object attributes?
>>
>><text datapath="idDset:/item/name/text()" />
>><text datapath="idDset:/item" />
>><text datapath="idDset:/item [1]/name/text ()" />
>>Doesn't display any results.
>>
>>Have try to use a text object instead of a java bean object, it work's 
>>fine!
>>
>>
>>
>>Help!!! Thanks
>>
>>Best regard's
>>Dzafer
>>
>>------------------------------------------------------------------------
>>
>>_______________________________________________
>>Laszlo-dev mailing list
>>Laszlo-dev at openlaszlo.org
>>http://www.openlaszlo.org/mailman/listinfo/laszlo-dev
>> 
>>
>>    
>>
>
>
>  
>

-------------- next part --------------
/* ****************************************************************************
 * MyJavaBean.java
 * ****************************************************************************/

/* J_LZ_COPYRIGHT_BEGIN *******************************************************
* Copyright 2001-2004 Laszlo Systems, Inc.  All Rights Reserved.              *
* Use is subject to license terms.                                            *
* J_LZ_COPYRIGHT_END *********************************************************/
package examples;

/**
 * Class used in ReturnJavaBeanExample.java.
 */
public class MyJavaBean {
    String name;
    String city;
    String state;
    String secret;

    public MyJavaBean(String name, String city, String state, String secret) {
        this.name = name;
        this.city = city;
        this.state = state;
        this.secret = secret;
    }

    public String getName() { return name; }
    public String getCity() { return city; }
    public String getState() { return state; }
}
-------------- next part --------------
/* ****************************************************************************
 * SessionJavaBean.java
 * ****************************************************************************/

/* J_LZ_COPYRIGHT_BEGIN *******************************************************
* Copyright 2001-2004 Laszlo Systems, Inc.  All Rights Reserved.              *
* Use is subject to license terms.                                            *
* J_LZ_COPYRIGHT_END *********************************************************/
package examples;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpSession;
import java.util.Map;

/**
 * Class used in examples/javarpc/sessionjavabean.lzx.
 */
public class SessionJavaBean {
    String name;

    public static Map getSessionMap(HttpServletRequest req) {
        // Assume that __lzobj already exists.
        return (Map)req.getSession().getAttribute("__lzobj");
    }

    public void create(String name, HttpServletRequest req) {
        this.name = name;
        MyJavaBean mjb = 
            new MyJavaBean(name, "san mateo", "california", "toomanysecrets");
        Map map = getSessionMap(req);
        map.put("myattr", mjb);
    }

    public String getName() { return name; }

    public void setName(String name) { this.name = name; }

    public MyJavaBean getMyJavaBean(HttpServletRequest req) {
        Map map = getSessionMap(req);
        return (MyJavaBean)map.get("myattr");
    }
}
-------------- next part --------------
<canvas debug="true">

    <debug x="10" y="10" width="450" height="350" />

    <security>
        <allow>
            <pattern>examples\..*</pattern>
        </allow>
    </security>

    <javarpc name="create" classname="examples.SessionJavaBean"
            scope="session" autoload="true"
            objectreturntype="javabean">
        <method event="onload">
            Debug.write('----- javarpc proxy -----');
            Debug.inspect(this.proxy);

            // create object on server
            this.create.invoke(['laszlo']);
        </method>
        <remotecall funcname="create">
            <method event="ondata">
                Debug.write('Invoking getMyJavaBean remotecall...')
                parent.getMyJavaBean.invoke();
            </method>
        </remotecall>
        <remotecall funcname="getMyJavaBean">
            <method event="ondata" args="d">
                Debug.write('----- MyJavaBean -----');
                Debug.inspect(d);
            </method>
        </remotecall>
    </javarpc>

</canvas>
-------------- next part --------------
<canvas debug="true">

    <debug x="10" y="10" width="450" height="350" />

    <dataset name="jbdset" />

    <security>
        <allow>
            <pattern>examples\..*</pattern>
        </allow>
    </security>

    <javarpc name="myjavabean" classname="examples.MyJavaBean"
            attributename="myattr" scope="session" autoload="true" 
            objectreturntype="javabean">
        <method event="onload">
            Debug.write('----- javarpc proxy -----');
            Debug.inspect(this.proxy);
            // create object on server
            this.getName.invoke();
        </method>
        <remotecall funcname="getName" dataobject="jbdset">
            <method event="ondata" args="d">
                Debug.write('----- MyJavaBean.getName() -----');
                Debug.inspect(d);
                Debug.write(jbdset.serialize());
            </method>
        </remotecall>
    </javarpc>

</canvas>