/*
* Copyright 2007-2008 the original author or authors.
*
* 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.impalaframework.web.module.listener;
import java.util.Set;
import javax.servlet.ServletContext;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.impalaframework.facade.ModuleManagementFacade;
import org.impalaframework.module.monitor.BaseModuleChangeListener;
import org.impalaframework.module.monitor.ModuleChangeEvent;
import org.impalaframework.module.monitor.ModuleContentChangeListener;
import org.impalaframework.module.operation.ModuleOperation;
import org.impalaframework.module.operation.ModuleOperationConstants;
import org.impalaframework.module.operation.ModuleOperationInput;
import org.impalaframework.module.spi.Application;
import org.impalaframework.module.spi.ApplicationManager;
import org.impalaframework.web.helper.WebServletUtils;
import org.springframework.web.context.ServletContextAware;
/**
* {@link ModuleContentChangeListener} implementation which initiates a module reload for the current
* application instance, after detecting change of module contents. In order for this to work, the
* Impala property <code>auto.reload</code> needs to be set.
*
* @see ApplicationManager#getCurrentApplication()
* @author Phil Zoio
*/
public class WebModuleChangeListener extends BaseModuleChangeListener implements
ModuleContentChangeListener, ServletContextAware {
private static final Log logger = LogFactory.getLog(WebModuleChangeListener.class);
private ServletContext servletContext;
public WebModuleChangeListener() {
super();
}
public void moduleContentsModified(ModuleChangeEvent event) {
Set<String> modified = getModifiedModules(event);
if (!modified.isEmpty()) {
ModuleManagementFacade factory = WebServletUtils.getModuleManagementFacade(servletContext);
ApplicationManager applicationManager = factory.getApplicationManager();
Application application = applicationManager.getCurrentApplication();
for (String moduleName : modified) {
logger.info("Processing modified module " + moduleName);
ModuleOperation operation = factory.getModuleOperationRegistry().getOperation(ModuleOperationConstants.ReloadNamedModuleOperation);
ModuleOperationInput moduleOperationInput = new ModuleOperationInput(null, null, moduleName);
operation.execute(application, moduleOperationInput);
}
}
}
public void setServletContext(ServletContext servletContext) {
this.servletContext = servletContext;
}
}