| /* |
| * 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. |
| */ |
| package org.apache.cocoon.portal.event.aspect.impl; |
| |
| import org.apache.avalon.framework.logger.AbstractLogEnabled; |
| import org.apache.avalon.framework.parameters.ParameterException; |
| import org.apache.avalon.framework.parameters.Parameterizable; |
| import org.apache.avalon.framework.parameters.Parameters; |
| import org.apache.avalon.framework.thread.ThreadSafe; |
| import org.apache.cocoon.environment.ObjectModelHelper; |
| import org.apache.cocoon.environment.Request; |
| import org.apache.cocoon.environment.Response; |
| import org.apache.cocoon.portal.PortalService; |
| import org.apache.cocoon.portal.event.aspect.EventAspect; |
| import org.apache.cocoon.portal.event.aspect.EventAspectContext; |
| |
| /** |
| * This aspect "disables" the back button of the browser and tries to avoid |
| * problems with the user browsing in multiple windows. |
| * This event attaches a unique number to each request. For each user only the |
| * current number is "active". Every request comming in containing an older |
| * number is disregarded and therefore ignored. |
| * WARNING: This aspect solves some problems while introducing new ones. Some |
| * features of the portal do NOT work when this aspect is used. |
| * |
| * @author <a href="mailto:cziegeler@s-und-n.de">Carsten Ziegeler</a> |
| * @author <a href="mailto:volker.schmitt@basf-it-services.com">Volker Schmitt</a> |
| * |
| * @version CVS $Id$ |
| */ |
| public class ActionCounterEventAspect |
| extends AbstractLogEnabled |
| implements EventAspect, |
| ThreadSafe, |
| Parameterizable { |
| |
| protected final static String ATTRIBUTE_NAME = ActionCounterEventAspect.class.getName(); |
| |
| /** The name of the parameter to check */ |
| protected String parameterName; |
| |
| /* (non-Javadoc) |
| * @see org.apache.cocoon.portal.event.aspect.EventAspect#process(org.apache.cocoon.portal.event.aspect.EventAspectContext, org.apache.cocoon.portal.PortalService) |
| */ |
| public void process(EventAspectContext context, PortalService service) { |
| final String requestParameterName = context.getAspectParameters().getParameter("parameter-name", this.parameterName); |
| |
| int actionCount; |
| |
| Integer actionValue = (Integer) service.getAttribute(ATTRIBUTE_NAME); |
| if (null == actionValue) { |
| actionValue = new Integer(0); |
| service.setAttribute(ATTRIBUTE_NAME, actionValue); |
| actionCount = 0; |
| } else { |
| actionCount = actionValue.intValue() + 1; |
| service.setAttribute(ATTRIBUTE_NAME, new Integer(actionCount)); |
| } |
| |
| final Request request = ObjectModelHelper.getRequest( context.getObjectModel() ); |
| String value = request.getParameter( requestParameterName ); |
| if ( value != null && actionCount > 0) { |
| // get number |
| int number = 0; |
| try { |
| number = Integer.parseInt( value ); |
| } catch (Exception ignore) { |
| number = -1; |
| } |
| |
| if ( number == actionCount - 1) { |
| // and invoke next one |
| context.invokeNext( service ); |
| } |
| } |
| service.getComponentManager().getLinkService().addUniqueParameterToLink( requestParameterName, String.valueOf(actionCount)); |
| |
| final Response response = ObjectModelHelper.getResponse( context.getObjectModel() ); |
| response.setHeader("Cache-Control", "no-cache"); |
| response.addHeader("Cache-Control", "no-store"); |
| response.setHeader("Pragma", "no-cache"); |
| response.setHeader("Expires", "Thu, 01 Jan 2000 00:00:00 GMT"); |
| } |
| |
| /* (non-Javadoc) |
| * @see org.apache.avalon.framework.parameters.Parameterizable#parameterize(org.apache.avalon.framework.parameters.Parameters) |
| */ |
| public void parameterize(Parameters parameters) |
| throws ParameterException { |
| this.parameterName = parameters.getParameter("parameter-name", "cocoon-portal-action"); |
| } |
| } |