hi john,
imho the gwt is just a webapp. so i'm a bit confused why talking about threads
in a j2ee env?
if i understand you right you want to share one neo4j instance between
different gwt apps(services). i would propose creating a context-listener, on
application startup the embedded-graph-db is placed in the servlet context.
(see the code-snippets)
a other approach would be accessing the neo4j-server direct from the gwt
(javascript) code through the rest-api. this assumes a driver written in
gwt-java/javascript.
@jim i hope to find the time this friday creating a lab-project this friday for
this :)
cheers
/thomas
----
// register in web.xml !!!!
public class NeoContextListner implements ServletContextListener {
private static final String CONTEXT_KEY = "neo4j-instance";
public static EmbeddedGraphDatabase getNeo4JInstance(ServletContext
servletContext) {
return (EmbeddedGraphDatabase) servletContext.getAttribute(CONTEXT_KEY);
}
public void contextInitialized(ServletContextEvent servletContextEvent) {
EmbeddedGraphDatabase db = new EmbeddedGraphDatabase("/tmp/db");
ServletContext servletContext = servletContextEvent.getServletContext();
servletContext.setAttribute(CONTEXT_KEY, db);
}
public void contextDestroyed(ServletContextEvent servletContextEvent) {
ServletContext servletContext = servletContextEvent.getServletContext();
EmbeddedGraphDatabase db = getNeo4JInstance(servletContext);
db.shutdown();
}
}
usage:
public class TestServiceImpl extends RemoteServiceServlet implements
TestService {
public AnyResult doIt(String argument) {
EmbeddedGraphDatabase db =
NeoContextListner.getNeo4JInstance(getServletContext());
.... use it
}
}
Am 09.05.2011 um 23:11 schrieb Christoph K.:
> Hi John,
>
> if i unterstand Jim right, he means that you should fire up threads on the
> serverside implementation which handle client requests and deal with a
> single instance of the embeddedgraphdatabase.
>
> greetings
> Chris
>
> On Mon, May 9, 2011 at 11:06 PM, John Doran <john.do...@hotmail.com> wrote:
>
>> Hi Jim,
>> Thanks for the reply, I haven't delved into the server aspect of neo4j(I'll
>> leave that until I finish up college). I'll have to refresh my threading
>> knowledge, you reckon each time users want to interact with the db to
>> create
>> a thread and this would stop any exceptions relating to not being able to
>> connect to the database(because it's in use).
>> Regards,
>> John.
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