org.springframework.web.portlet.context.PortletRequestAttributes Maven / Gradle / Ivy
/*
* Copyright 2002-2007 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.springframework.web.portlet.context;
import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;
import javax.portlet.PortletRequest;
import javax.portlet.PortletSession;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.springframework.util.Assert;
import org.springframework.web.context.request.AbstractRequestAttributes;
import org.springframework.web.context.request.RequestAttributes;
import org.springframework.web.portlet.util.PortletUtils;
/**
* Portlet-based implementation of the
* {@link org.springframework.web.context.request.RequestAttributes} interface.
*
* Accesses objects from portlet request and portlet session scope,
* with a distinction between "session" (the PortletSession's "portlet scope")
* and "global session" (the PortletSession's "application scope").
*
* @author Juergen Hoeller
* @since 2.0
* @see javax.portlet.PortletRequest#getAttribute
* @see javax.portlet.PortletSession#getAttribute
* @see javax.portlet.PortletSession#PORTLET_SCOPE
* @see javax.portlet.PortletSession#APPLICATION_SCOPE
* @see RequestAttributes#SCOPE_SESSION
* @see RequestAttributes#SCOPE_GLOBAL_SESSION
*/
public class PortletRequestAttributes extends AbstractRequestAttributes {
/**
* We'll create a lot of these objects, so we don't want a new logger every time.
*/
private static final Log logger = LogFactory.getLog(PortletRequestAttributes.class);
private final PortletRequest request;
private PortletSession session;
private final Map sessionAttributesToUpdate = new HashMap();
private final Map globalSessionAttributesToUpdate = new HashMap();
/**
* Create a new PortletRequestAttributes instance for the given request.
* @param request current portlet request
*/
public PortletRequestAttributes(PortletRequest request) {
Assert.notNull(request, "Request must not be null");
this.request = request;
// Fetch existing session reference early, to have it available even
// after request completion (for example, in a custom child thread).
this.session = request.getPortletSession(false);
}
/**
* Exposes the native {@link PortletRequest} that we're wrapping.
*/
public final PortletRequest getRequest() {
return this.request;
}
/**
* Exposes the {@link PortletSession} that we're wrapping.
* @param allowCreate whether to allow creation of a new session if none exists yet
*/
protected final PortletSession getSession(boolean allowCreate) {
try {
this.session = this.request.getPortletSession(allowCreate);
return this.session;
}
catch (IllegalStateException ex) {
// Couldn't access session... let's check why.
if (this.session == null) {
// No matter what happened - we cannot offer a session.
throw ex;
}
// We have a fallback session reference...
// Let's see whether it is appropriate to return it.
if (allowCreate) {
boolean canAskForExistingSession = false;
try {
this.session = this.request.getPortletSession(false);
canAskForExistingSession = true;
}
catch (IllegalStateException ex2) {
}
if (canAskForExistingSession) {
// Could ask for existing session, hence the IllegalStateException
// came from trying to create a new session too late -> rethrow.
throw ex;
}
}
// Else: Could not even ask for existing session, hence we assume that
// the request has been completed and the session is accessed later on
// (for example, in a custom child thread).
return this.session;
}
}
public Object getAttribute(String name, int scope) {
if (scope == SCOPE_REQUEST) {
return this.request.getAttribute(name);
}
else {
PortletSession session = getSession(false);
if (session != null) {
if (scope == SCOPE_GLOBAL_SESSION) {
Object value = session.getAttribute(name, PortletSession.APPLICATION_SCOPE);
if (value != null) {
this.globalSessionAttributesToUpdate.put(name, value);
}
return value;
}
else {
Object value = session.getAttribute(name);
if (value != null) {
this.sessionAttributesToUpdate.put(name, value);
}
return value;
}
}
else {
return null;
}
}
}
public void setAttribute(String name, Object value, int scope) {
if (scope == SCOPE_REQUEST) {
this.request.setAttribute(name, value);
}
else {
PortletSession session = getSession(true);
if (scope == SCOPE_GLOBAL_SESSION) {
session.setAttribute(name, value, PortletSession.APPLICATION_SCOPE);
this.globalSessionAttributesToUpdate.remove(name);
}
else {
session.setAttribute(name, value);
this.sessionAttributesToUpdate.remove(name);
}
}
}
public void removeAttribute(String name, int scope) {
if (scope == SCOPE_REQUEST) {
this.request.removeAttribute(name);
removeRequestDestructionCallback(name);
}
else {
PortletSession session = getSession(false);
if (session != null) {
if (scope == SCOPE_GLOBAL_SESSION) {
session.removeAttribute(name, PortletSession.APPLICATION_SCOPE);
this.globalSessionAttributesToUpdate.remove(name);
}
else {
session.removeAttribute(name);
this.sessionAttributesToUpdate.remove(name);
}
}
}
}
public void registerDestructionCallback(String name, Runnable callback, int scope) {
if (scope == SCOPE_REQUEST) {
registerRequestDestructionCallback(name, callback);
}
else {
registerSessionDestructionCallback(name, callback);
}
}
public String getSessionId() {
return getSession(true).getId();
}
public Object getSessionMutex() {
return PortletUtils.getSessionMutex(getSession(true));
}
/**
* Update all accessed session attributes through session.setAttribute
* calls, explicitly indicating to the container that they might have been modified.
*/
protected void updateAccessedSessionAttributes() {
PortletSession session = this.request.getPortletSession(false);
if (session != null) {
for (Iterator it = this.sessionAttributesToUpdate.entrySet().iterator(); it.hasNext();) {
Map.Entry entry = (Map.Entry) it.next();
String name = (String) entry.getKey();
Object newValue = entry.getValue();
Object oldValue = session.getAttribute(name);
if (oldValue == newValue) {
session.setAttribute(name, newValue);
}
}
for (Iterator it = this.globalSessionAttributesToUpdate.entrySet().iterator(); it.hasNext();) {
Map.Entry entry = (Map.Entry) it.next();
String name = (String) entry.getKey();
Object newValue = entry.getValue();
Object oldValue = session.getAttribute(name, PortletSession.APPLICATION_SCOPE);
if (oldValue == newValue) {
session.setAttribute(name, newValue, PortletSession.APPLICATION_SCOPE);
}
}
}
this.sessionAttributesToUpdate.clear();
this.globalSessionAttributesToUpdate.clear();
}
/**
* Register the given callback as to be executed after session termination.
* @param name the name of the attribute to register the callback for
* @param callback the callback to be executed for destruction
*/
private void registerSessionDestructionCallback(String name, Runnable callback) {
if (logger.isWarnEnabled()) {
logger.warn("Could not register destruction callback [" + callback + "] for attribute '" + name +
"' for session scope because Portlet API 1.0 does not support session attribute callbacks");
}
}
}