non-releases/trunk_before_flattening/src/java/org/apache/cocoon/core/osgi/ServiceManagerActivator.java

/*
 * Copyright 2005 The Apache Software Foundation
 * Licensed  under the  Apache License,  Version 2.0  (the "License");
 * you may not use  this file  except in  compliance with the License.
 * You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed  under the  License is distributed on an "AS IS" BASIS,
 * WITHOUT  WARRANTIES OR CONDITIONS  OF ANY KIND, either  express  or
 * implied.
 *
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.apache.cocoon.core.osgi;

import java.net.URL;

import org.apache.avalon.excalibur.logger.LoggerManager;
import org.apache.avalon.framework.configuration.Configuration;
import org.apache.avalon.framework.configuration.ConfigurationException;
import org.apache.avalon.framework.configuration.DefaultConfigurationBuilder;
import org.apache.avalon.framework.context.Context;
import org.apache.avalon.framework.service.ServiceException;
import org.apache.avalon.framework.service.ServiceManager;
import org.apache.cocoon.core.Core;
import org.apache.cocoon.core.container.CoreServiceManager;
import org.osgi.framework.BundleActivator;
import org.osgi.framework.BundleContext;
import org.osgi.service.log.LogService;

/**
 * @version $Id$
 * @since 2.2
 */
public class ServiceManagerActivator implements BundleActivator {


//  Registering services must go through the ServiceFactory class wrapping the componentHandler
    
    private ServiceManager parentManager;
    private OSGiCoreServiceManager manager;

    public void start(final BundleContext ctx) throws Exception {
        
        // Create a logger manager that delegates to OSGi
        // FIXME: have the maximum level as a property of the bundle
        LoggerManager logManager = new OSGiLoggerManager(ctx, LogService.LOG_DEBUG);

        // Create a parent manager that will lookup registered OSGi services
        this.parentManager = new OSGiServiceManager(ctx);
        
        // Create a regular manager
        this.manager = new OSGiCoreServiceManager(parentManager, this.getClass().getClassLoader(), ctx) {
        };

        //---- LogEnabled
        this.manager.enableLogging(logManager.getDefaultLogger());
        
        //---- Contextualizable
        //DefaultContext avalonCtx = new ComponentContext();
        // Context entries defined in CocoonServlet/CoreUtil:
        // "servlet-config"
        // "servlet-context"
        // ContextHelper.CONTEXT_ROOT_URL
        // Constants.CONTEXT_ENVIRONMENT_CONTEXT
        // Constants.CONTEXT_WORK_DIR
        // Constants.CONTEXT_UPLOAD_DIR
        // Constants.CONTEXT_CACHE_DIR
        // Constants.CONTEXT_CONFIG_URL
        // Constants.CONTEXT_DEFAULT_ENCODING
        // Constants.CONTEXT_CLASS_LOADER
        // Core.ROLE (???)
        // Constants.CONTEXT_CLASSPATH

        this.manager.contextualize(this.getContext());
        
        //---- LoggerManager
        this.manager.setLoggerManager(logManager);
        
        //---- RoleManager
        // No parent role manager
        this.manager.setRoleManager(null);
        
        //---- Configurable
        this.manager.configure(this.getConfiguration(ctx));
        this.addComponents(this.manager);
        
        //---- Initializable
        this.manager.initialize();

    }

    public void stop(BundleContext ctx) throws Exception {
        // Dispose the ServiceManager
        this.manager.dispose();
    }

    protected Context getContext() throws Exception {
        Core core = (Core)this.parentManager.lookup(Core.ROLE);
        return core.getContext();
    }

    /**
     * This method may be overwritten by subclasses to provide an own
     * configuration
     */
    protected Configuration getConfiguration(BundleContext ctx) throws Exception {
	URL confURL = ctx.getBundle().getResource("/WEB-INF/block.xml");
	DefaultConfigurationBuilder builder = new DefaultConfigurationBuilder();
	Configuration block = builder.build(confURL.openStream());
	Configuration components = block.getChild("components");

        return components;
    }

    /**
     * This method may be overwritten by subclasses to add aditional
     * components.
     */
    protected void addComponents(CoreServiceManager manager) 
    throws ServiceException, ConfigurationException {
        // subclasses can add components here
    }
}