ips1ap101.ejb.core.BeanLocator.java Source code

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Here is the source code for ips1ap101.ejb.core.BeanLocator.java

Source

/*
 * Este programa es software libre; usted puede redistribuirlo y/o modificarlo bajo los trminos
 * de la licencia "GNU General Public License" publicada por la Fundacin "Free Software Foundation".
 * Este programa se distribuye con la esperanza de que pueda ser til, pero SIN NINGUNA GARANTIA;
 * vea la licencia "GNU General Public License" para obtener mas informacin.
 */
package ips1ap101.ejb.core;

import java.text.MessageFormat;
import java.util.Collections;
import java.util.HashMap;
import java.util.Map;
import javax.naming.InitialContext;
import javax.naming.NamingException;
import ips1ap101.lib.core.CoreBundle;
import ips1ap101.lib.core.app.Bitacora;
import ips1ap101.lib.core.constant.EAC;
import ips1ap101.lib.core.util.EA;
import org.apache.commons.lang.StringUtils;

/**
 * @author Jorge Campins
 */
public class BeanLocator {

    private static Map<String, Object> cache;

    private static final String BEANS_SUFFIX;

    private static final String LOCAL_SUFFIX;

    static {
        String name = BeanLocator.class.getSimpleName();
        cache = Collections.synchronizedMap(new HashMap<String, Object>());
        BEANS_SUFFIX = CoreBundle.getString(name, "beans_suffix");
        LOCAL_SUFFIX = CoreBundle.getString(name, "local_suffix");
    }

    public static synchronized Object getBean(Class<?> local) {
        Bitacora.trace(BeanLocator.class, "getBean", local);
        if (local == null) {
            return null;
        }
        Object bean;
        String name = local.getName();
        if (cache.containsKey(name)) {
            bean = cache.get(name);
        } else {
            bean = lookup(local);
            cache.put(name, bean);
        }
        return bean;
    }

    private static Object lookup(Class<?> local) {
        Bitacora.trace(BeanLocator.class, "lookup", local);
        String key = EAC.JNDI_EJB_LOOKUP_PATTERN;
        String pattern = EA.getString(key);
        String name = local.getSimpleName();
        String root = StringUtils.removeEnd(name, LOCAL_SUFFIX);
        String arg0 = root + BEANS_SUFFIX;
        String arg1 = local.getName();
        String jndi = MessageFormat.format(pattern, arg0, arg1);
        Bitacora.trace(key + "=" + pattern);
        Bitacora.trace(key + "=" + jndi);
        try {
            Object object = InitialContext.doLookup(jndi);
            boolean assignable = object != null && local.isAssignableFrom(object.getClass());
            Bitacora.trace(arg0 + "=" + object + ", assignable=" + assignable);
            return object;
        } catch (NamingException ex) {
            return null;
        }
    }

}