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From Arnaud Garcia <arn...@imagemed-87.com>
Subject getThreadObjectContext with domain parameter - code -
Date Fri, 11 Sep 2009 11:19:27 GMT
Hello,

I created a filter to use multi domains in a webapp, but I still have
a problem...., I don't find the bug... if someone can help me to fix
it !
(I think that some people will also need this kind of filter, so this
is  why I post the complete code)

So, the last bug is that sometimes the ObjectContext cannot be retrieved.....
java.lang.IllegalStateException: Current thread has no bound ObjectContext.
     at com.imagemed.cayenne.ImagemedBaseContext.getThreadObjectContext(ImagemedBaseContext.java:39)

thanks

Arnaud


To use the filter:
----------------------

=>Declare the filter in web.xml as usual :

 <filter>
        <filter-name>Imagemed.Cayenne</filter-name>
        <filter-class>com.imagemed.cayenne.WebApplicationMultiDomainsContextFilter</filter-class>
    </filter>

    <filter-mapping>
        <filter-name>Imagemed.Cayenne</filter-name>
        <url-pattern>/*</url-pattern>
    </filter-mapping>

Then in your DAO you retrieve your contexts from your session like this:

 ctxtForDomain1 = (DataContext)
ImagemedBaseContext.getThreadObjectContext("DOMAIN1");
 ctxtForDomain2 = (DataContext)
ImagemedBaseContext.getThreadObjectContext("DOMAIN2");
....

Below you will find the complete code.....


------------------------------ THE FILTER -------------------------
package com.imagemed.cayenne;

import java.io.IOException;
import java.util.ArrayList;
import java.util.Collection;
import java.util.logging.Logger;
import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpSession;
import org.apache.cayenne.access.DataContext;
import org.apache.cayenne.access.DataDomain;
import org.apache.cayenne.conf.Configuration;
import org.apache.cayenne.conf.ServletUtil;


public class WebApplicationMultiDomainsContextFilter implements Filter {

    public static final String DATA_CONTEXT_KEY = "cayenne.datacontext";
    private ArrayList<String> domains = new ArrayList<String>();
    private static final Logger log =
Logger.getLogger(WebApplicationMultiDomainsContextFilter.class.getName());

    public static DataContext getSessionContext(HttpSession session,
String domain) {
        synchronized (session) {
            String dataCtxKey = DATA_CONTEXT_KEY + "." + domain;
            DataContext ctxt = (DataContext) session.getAttribute(dataCtxKey);

            if (ctxt == null) {
                ctxt = DataContext.createDataContext(domain);
                session.setAttribute(dataCtxKey, ctxt);
            } else {
                log.fine("[RETRIEVE] DataContext (" + ctxt.hashCode()
+ ") retrieved from session key=" + dataCtxKey);
            }

            return ctxt;
        }
    }

    public void destroy() {
    }

    public void doFilter(ServletRequest request, ServletResponse
response, FilterChain chain) throws IOException, ServletException {
        boolean reset = false;

        if (request instanceof HttpServletRequest) {
            reset = true;

            HttpSession session = ((HttpServletRequest)
request).getSession(true);
            for (String domain : domains) {
                DataContext context = getSessionContext(session, domain);
                ImagemedBaseContext.bindThreadObjectContext(context, domain);
            }
        }

        try {
            chain.doFilter(request, response);
        } finally {
            if (reset) {
                for (String domain : domains) {
                    ImagemedBaseContext.bindThreadObjectContext(null, domain);
                }
            }
        }
    }

    public void init(FilterConfig filterConfig) throws ServletException {
        ServletUtil.initializeSharedConfiguration(filterConfig.getServletContext());
        Collection<DataDomain> collDomains =
Configuration.getSharedConfiguration().getDomains();
        for (DataDomain dataDomain : collDomains) {
            domains.add(dataDomain.getName());
            log.info("[FOUND DOMAIN] name=" + dataDomain.getName());
        }
    }
}

------------------------------ ImagemedBaseContext ------------------------
package com.imagemed.cayenne;

import java.util.Collections;
import java.util.HashMap;
import java.util.Map;
import java.util.logging.Logger;
import org.apache.cayenne.ObjectContext;

public class ImagemedBaseContext {

    private static Map<String, ThreadLocal> threadLocalMap =
Collections.synchronizedMap(new HashMap<String, ThreadLocal>());
    private static final Logger log =
Logger.getLogger(ImagemedBaseContext.class.getName());

    public static ObjectContext getThreadObjectContext(String domain)
throws IllegalStateException {
        ThreadLocal<ObjectContext> threadObjectContext =
threadLocalMap.get(domain);
        ObjectContext context = threadObjectContext.get();

        if (context == null) {
            throw new IllegalStateException("Current thread has no
bound ObjectContext.");       <============================ ligne 39
        } else {
            log.fine("[GET OBJECT CONTEXT] ObjectContext (" +
context.hashCode() + ") for domain=" + domain + " to ThreadLocal (" +
threadObjectContext.hashCode() + ")");
        }
        return context;

    }

    public static void bindThreadObjectContext(ObjectContext context,
String domain) {
        ThreadLocal<ObjectContext> threadObjectContext = new
ThreadLocal<ObjectContext>();
        threadObjectContext.set(context);
        threadLocalMap.put(domain, threadObjectContext);
        if (context == null) {
            log.fine("[UNBIND OBJECT CONTEXT]");
        } else {
            log.fine("[BIND OBJECT CONTEXT] ObjectContext (" +
context.hashCode() + ") for domain=" + domain + " to ThreadLocal (" +
threadObjectContext.hashCode() + ")");
        }
    }
}

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