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package org.glassfish.weld;

import java.util.logging.Logger;

import org.osgi.framework.BundleActivator; 
import org.osgi.framework.BundleContext; 

import org.jboss.weld.bootstrap.api.SingletonProvider;
import org.jboss.weld.bootstrap.api.helpers.TCCLSingletonProvider;

/**
 * This is a bundle activator which is responsible for configuring Weld bundle
 * to be used in GlassFish. As part of configuration, it configures the the
 * SingletonProvider in Weld. It sets different SingletonProvider for different
 * profiles. e.g., in WebProfile, it sets
 * {@link org.jboss.weld.bootstrap.api.helpers.TCCLSingletonProvider}, where as
 * for full-javaee profile, it uses
 * {@link org.glassfish.weld.ACLSingletonProvider}. It tests profile by testing
 * existence of {@link org.glassfish.javaee.full.deployment.EarClassLoader}.
 * 
 * Since Weld 1.1, an implementation of the 
 * {@link org.jboss.weld.serialization.spi.ProxyServices} SPI is used to provide
 * a classloader to load javassist defined proxies. This classloader ensures
 * that they can load not only application defined classes but also classes 
 * exported by any OSGi bundle as long as the operation is happening in 
 * the context of a Java EE app.
 * 
 * The bundle activator resets the SingletonProvicer in stop().
 * 
 * @author Sanjeeb.Sahoo@Sun.COM
 */
public class WeldActivator implements BundleActivator {
    private Logger logger = Logger.getLogger(WeldActivator.class.getName());

    // private javassist.util.proxy.ProxyFactory.ClassLoaderProvider oldCLP;

    public void start(BundleContext context) throws Exception {
        boolean earSupport = false;
        try {
            Class
                    .forName("org.glassfish.javaee.full.deployment.EarClassLoader");
            earSupport = true;
        } catch (ClassNotFoundException cnfe) {
        }
        SingletonProvider.initialize(earSupport ? new ACLSingletonProvider()
                : new TCCLSingletonProvider());
    }

    public void stop(BundleContext context) throws Exception {
        SingletonProvider.reset();
    }

}