Datacage: Added <dc:filter> element. This allows cleaner way to narrow the datasets. Example: <dc:context> <dc:statement> SELECT DISTINCT name AS hws_name, official AS hws_official, kind_id AS hws_kind FROM hws_lines WHERE river_id = ${river_id} </dc:statement> <dc:if test="dc:has-result()"> <lines> <dc:macro name="hws-lines"> <dc:elements> <hws factory="hwsfactory" name="{$hws_name}"/> </dc:elements> </dc:macro> <dc:filter expr="$hws_official=1"> <dc:if test="dc:has-result()"> <official> <dc:filter expr="$hws_kind=1"> <dc:if test="dc:has-result()"> <Durchlass><dc:call-macro name="hws-lines"></Durchlass> </dc:if> </dc:filter> <dc:filter expr="$hws_kind=2"> <dc:if test="dc:has-result()"> <Damm><dc:call-macro name="hws-lines"></Damm> </dc:if> </dc:filter> <dc:filter expr="$hws_kind=3"> <dc:if test="dc:has-result()"> <Graben><dc:call-macro name="hws-lines"></Graben> </dc:if> </dc:filter> </official> </dc:if> </dc:filter> </lines> </dc:if> </dc:context>

package de.intevation.flys.backend;

import org.apache.log4j.Logger;

import org.hibernate.Session;
import org.hibernate.SessionFactory;


public class SessionHolder
{
    private static Logger log =
        Logger.getLogger(SessionHolder.class);

    public static final ThreadLocal<Session> HOLDER =
        new ThreadLocal<Session>() {
            @Override
            protected Session initialValue() {
                return create();
            }
        };

    private SessionHolder() {
    }

    public synchronized static Session create() {
        log.debug("create");
        SessionFactory sessionFactory =
            SessionFactoryProvider.getSessionFactory();
        return sessionFactory.openSession();
    }

    public static Session acquire() {
        log.debug("acquire");
        Session session = create();
        HOLDER.set(session);
        return session;
    }

    public static void release() {
        log.debug("release");
        HOLDER.remove();
    }
}
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