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Central module for Tapestry, containing interfaces to the Java
Servlet API and all core services and components.
// Copyright 2008, 2010 The Apache Software Foundation
//
// 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.apache.tapestry5.internal.services;
import java.io.IOException;
import org.apache.tapestry5.internal.InternalConstants;
import org.apache.tapestry5.internal.structure.Page;
import org.apache.tapestry5.services.Request;
/**
* Alternative implementation, used when {@link org.apache.tapestry5.SymbolConstants#SUPPRESS_REDIRECT_FROM_ACTION_REQUESTS}
* is set to true.
*/
public class ImmediateActionRenderResponseGenerator implements ActionRenderResponseGenerator
{
private final Request request;
public ImmediateActionRenderResponseGenerator(Request request)
{
this.request = request;
}
public void generateResponse(Page page) throws IOException
{
assert page != null;
if (request.getAttribute(InternalConstants.IMMEDIATE_RESPONSE_PAGE_ATTRIBUTE) != null) return;
// We are somewhere in the middle of processing an action request, possibly something
// complicated like a form submission. Tapestry components are not re-entrant, so we
// can't render the request right now, instead we record that we need to render
// a response as an attribute, and let a filter on the ComponentEventRequestHandler service
// do the work.
request.setAttribute(InternalConstants.IMMEDIATE_RESPONSE_PAGE_ATTRIBUTE, page);
}
}