package org.apache.turbine.services.avaloncomponent;
/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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.
*/
import java.io.IOException;
import org.apache.avalon.framework.activity.Disposable;
import org.apache.avalon.framework.activity.Initializable;
import org.apache.avalon.framework.logger.CommonsLogger;
import org.apache.avalon.framework.logger.Logger;
import org.apache.avalon.framework.service.ServiceException;
import org.apache.commons.configuration.Configuration;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.fulcrum.yaafi.framework.container.ServiceContainer;
import org.apache.fulcrum.yaafi.framework.factory.ServiceContainerConfiguration;
import org.apache.fulcrum.yaafi.framework.factory.ServiceContainerFactory;
import org.apache.turbine.Turbine;
import org.apache.turbine.services.InitializationException;
import org.apache.turbine.services.InstantiationException;
import org.apache.turbine.services.TurbineBaseService;
/**
* An implementation of Turbine service initializing the YAAFI container
*
* @author <a href="mailto:siegfried.goescfl@it20one.at">Siegfried Goeschl</a>
*/
public class TurbineYaafiComponentService
extends TurbineBaseService
implements AvalonComponentService, Initializable, Disposable
{
/** the logger to be used */
private static Log log = LogFactory.getLog(AVALON_LOG_CATEGORY);
/** property to lookup the container configuration file */
public static final String CONTAINER_CONFIGURATION_KEY = "containerConfiguration";
/** the default value for the container configuration file */
public static final String CONTAINER_CONFIGURATION_VALUE = "/WEB-INF/conf/containerConfiguration.xml";
/** property to lookup the properties file */
public static final String COMPONENT_PARAMETERS_KEY = "parameters";
/** the default value for the parameter file */
public static final String COMPONENT_PARAMETERS_VALUE = "/WEB-INF/conf/parameters.properties";
/** YAFFI container */
private ServiceContainer container;
// -------------------------------------------------------------
// Service initialization
// -------------------------------------------------------------
public TurbineYaafiComponentService()
{
// nothing to do
}
/**
* Load all configured components and initialize them. This is a zero parameter variant which
* queries the Turbine Servlet for its config.
*
* @throws InitializationException Something went wrong in the init stage
*/
public void init() throws InitializationException
{
try
{
log.info( "Initializing TurbineYaafiComponentService ..." );
initialize();
setInit(true);
}
catch (Exception e)
{
log.error("Exception caught initialising service: ", e);
throw new InitializationException("Initializing TurbineYaafiComponentService failed", e);
}
}
/**
* Shuts the Component Service down, calls dispose on the components that implement this
* interface
*
*/
public void shutdown()
{
log.info( "Disposing TurbineYaafiComponentService ..." );
dispose();
setInit(false);
}
// -------------------------------------------------------------
// Avalon lifecycle interfaces
// -------------------------------------------------------------
/**
* Initializes the container
*
* @throws Exception generic exception
*/
public void initialize() throws Exception
{
// get the configuration from the baseclass
Configuration conf = this.getConfiguration();
// determine the home directory
String homePath = Turbine.getRealPath("/");
log.info( "Using the following home : " + homePath );
// create the configuration for YAAFI
ServiceContainerConfiguration config =
this.createServiceContainerConfiguration(conf);
config.setLogger( this.createAvalonLogger() );
config.setApplicationRootDir( homePath );
// initialize the container
try
{
this.container = ServiceContainerFactory.create(
config
);
}
catch (Exception e)
{
String msg = "Initializing YAAFI failed";
log.error(msg,e);
throw e;
}
}
/**
* Disposes of the container and releases resources
*/
public void dispose()
{
if (this.container != null)
{
this.container.dispose();
this.container = null;
}
}
/**
* Returns an instance of the named component
*
* @param roleName Name of the role the component fills.
* @return an instance of the named component
* @throws Exception generic exception
*/
public Object lookup(String roleName) throws ServiceException
{
return this.container.lookup(roleName);
}
/**
* Releases the component.
*
* @param component the component to release
*/
public void release(Object component)
{
this.container.release( component );
}
/**
* @see org.apache.avalon.framework.service.ServiceManager#hasService(java.lang.String)
*/
public boolean hasService(String roleName)
{
return this.container.hasService(roleName);
}
/**
* Create a ServiceContainerConfiguration based on the Turbine configuration
*
* @param conf the Turbine configuration
* @return the YAAFI configuration
* @throws IOException creating the YAAFI configuration failed
*/
protected ServiceContainerConfiguration createServiceContainerConfiguration( Configuration conf )
throws IOException
{
ServiceContainerConfiguration result = new ServiceContainerConfiguration();
// are we using a "containerConfiguration.xml" ?!
if( conf.containsKey(CONTAINER_CONFIGURATION_KEY) )
{
// determine the container configuration file
String containerConfiguration = conf.getString(
CONTAINER_CONFIGURATION_KEY
);
result.loadContainerConfiguration(containerConfiguration);
}
else if( conf.containsKey(COMPONENT_ROLE_KEY) )
{
// determine the location of the role configuraton file
String roleConfigurationFileName = conf.getString(
COMPONENT_ROLE_KEY,
COMPONENT_ROLE_VALUE
);
// determine the location of component configuration file
String componentConfigurationFileName = conf.getString(
COMPONENT_CONFIG_KEY,
COMPONENT_CONFIG_VALUE
);
// determine the location of parameters file
String parametersFileName = conf.getString(
COMPONENT_PARAMETERS_KEY,
COMPONENT_PARAMETERS_VALUE
);
result.setComponentRolesLocation( roleConfigurationFileName );
result.setComponentConfigurationLocation( componentConfigurationFileName );
result.setParametersLocation( parametersFileName );
}
else
{
// determine the container configuration file
String containerConfiguration = conf.getString(
CONTAINER_CONFIGURATION_KEY,
CONTAINER_CONFIGURATION_VALUE
);
result.loadContainerConfiguration(containerConfiguration);
}
return result;
}
/**
* Create the Avalon logger to be passed to YAAFI
* @return an Avalon Logger
*/
protected Logger createAvalonLogger()
{
Logger result = new CommonsLogger(log, AVALON_LOG_CATEGORY);
return result;
}
// -------------------------------------------------------------
// TurbineServiceProvider
// -------------------------------------------------------------
/**
* @see org.apache.turbine.services.TurbineServiceProvider#exists(java.lang.String)
*/
public boolean exists(String roleName)
{
return this.hasService(roleName);
}
/**
* @see org.apache.turbine.services.TurbineServiceProvider#get(java.lang.String)
*/
public Object get(String roleName) throws InstantiationException
{
try
{
return this.lookup(roleName);
}
catch (ServiceException e)
{
String msg = "Unable to get the following service : " + roleName;
log.error(msg);
throw new InstantiationException(msg);
}
catch (Throwable t)
{
String msg = "Unable to get the following service : " + roleName;
log.error(msg,t);
throw new InstantiationException(msg,t);
}
}
}