/*
* Copyright 2007 Tim Peierls
*
* 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.directwebremoting.guice;
import javax.servlet.ServletContext;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpSession;
import org.directwebremoting.ScriptSession;
import org.directwebremoting.WebContextFactory;
import org.directwebremoting.guice.util.AbstractSimpleContextScope;
import org.directwebremoting.guice.util.ContextScope;
import static org.directwebremoting.guice.DwrGuiceUtil.*;
/**
* Scopes available to DWR applications.
* @author Tim Peierls [tim at peierls dot net]
*/
public class DwrScopes
{
/**
* HTTP request scope.
*/
public static final ContextScope<HttpServletRequest> REQUEST =
new AbstractSimpleContextScope<HttpServletRequest>(
HttpServletRequest.class, "DwrScopes.REQUEST")
{
@Override
public HttpServletRequest get()
{
return WebContextFactory.get().getHttpServletRequest();
}
@Override
public Object get(HttpServletRequest request, String name)
{
return request.getAttribute(name);
}
@Override
public void put(HttpServletRequest request, String name, Object value)
{
request.setAttribute(name, value);
}
};
/**
* DWR script session scope.
*/
public static final ContextScope<ScriptSession> SCRIPT =
new AbstractSimpleContextScope<ScriptSession>(ScriptSession.class, "DwrScopes.SCRIPT")
{
@Override
public ScriptSession get()
{
return WebContextFactory.get().getScriptSession();
}
@Override
public Object get(ScriptSession scriptSession, String name)
{
return scriptSession.getAttribute(name);
}
@Override
public void put(ScriptSession scriptSession, String name, Object value)
{
scriptSession.setAttribute(name, value);
}
};
/**
* HTTP session scope. The implementation uses session identity to
* to track which sessions are open. Since the servlet spec doesn't
* guarantee identity of sessions between requests, don't rely on
* {@code getOpenContexts()} or {@code close(session, handlers)} to
* work correctly for this scope.
*/
public static final ContextScope<HttpSession> SESSION =
new AbstractSimpleContextScope<HttpSession>(HttpSession.class, "DwrScopes.SESSION")
{
@Override
public HttpSession get()
{
return WebContextFactory.get().getSession();
}
@Override
public Object get(HttpSession session, String name)
{
return session.getAttribute(name);
}
@Override
public void put(HttpSession session, String name, Object value)
{
session.setAttribute(name, value);
}
};
/**
* Application scope: objects in this scope <em>are</em> eagerly initialized
* during DWR servlet initialization, and Closeable objects in this scope are
* closed during DWR servlet destruction.
*/
public static final ContextScope<ServletContext> APPLICATION =
new ApplicationScope("DwrScopes.APPLICATION");
/**
* Global application scope: like {@link #APPLICATION}, but objects in
* this scope are <em>not</em> eagerly initialized and Closeable objects
* in this scope are closed during servlet context destruction (not
* during DWR servlet destruction).
*/
public static final ContextScope<ServletContext> GLOBAL =
new ApplicationScope("DwrScopes.GLOBAL");
static class ApplicationScope extends AbstractSimpleContextScope<ServletContext>
{
ApplicationScope(String scopeName)
{
super(ServletContext.class, scopeName);
}
@Override
public ServletContext get()
{
return getServletContext();
}
@Override
public Object get(ServletContext servletContext, String name)
{
/*
if (log.isDebugEnabled())
{
log.debug(String.format("servletContext.getAttribute(%s)", name));
}
//*/
return servletContext.getAttribute(name);
}
@Override
public void put(ServletContext servletContext, String name, Object value)
{
/*
if (log.isDebugEnabled())
{
log.debug(String.format("servletContext.setAttribute(%s, %s)", name, value));
}
//*/
servletContext.setAttribute(name, value);
}
}
private DwrScopes() { /* uninstantiable */ }
}