org.apache.wicket.core.request.mapper.BufferedResponseMapper Maven / Gradle / Ivy

Show more of this group Show more artifacts with this name
Show all versions of wicket-core Show documentation

Wicket is a Java web application framework that takes simplicity, separation of concerns and ease of development to a whole new level. Wicket pages can be mocked up, previewed and later revised using standard WYSIWYG HTML design tools. Dynamic content processing and form handling is all handled in Java code using a first-class component model backed by POJO data beans that can easily be persisted using your favorite technology.

There is a newer version: 10.0.0

Show newest version

/*
 * 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.wicket.core.request.mapper;

import org.apache.wicket.Application;
import org.apache.wicket.Session;
import org.apache.wicket.protocol.http.BufferedWebResponse;
import org.apache.wicket.protocol.http.WebApplication;
import org.apache.wicket.request.IRequestCycle;
import org.apache.wicket.request.IRequestHandler;
import org.apache.wicket.request.IRequestMapper;
import org.apache.wicket.request.Request;
import org.apache.wicket.request.Url;
import org.apache.wicket.request.cycle.RequestCycle;
import org.apache.wicket.core.request.handler.BufferedResponseRequestHandler;
import org.apache.wicket.session.ISessionStore;
import org.apache.wicket.util.string.Strings;

/**
 * Encoder that intercepts requests for which there is already stored buffer with rendered data.
 *
 * @author Matej Knopp
 */
public class BufferedResponseMapper implements IRequestMapper
{
	/**
	 * Construct.
	 */
	public BufferedResponseMapper()
	{
	}

	/**
	 * @return the current session id for stateful pages and null for stateless pages
	 *         and non-http threads
	 */
	protected String getSessionId()
	{
		String sessionId = null;

		if (Application.exists() && RequestCycle.get() != null)
		{
			ISessionStore sessionStore = Application.get().getSessionStore();
			IRequestCycle requestCycle = RequestCycle.get();
			Session session = sessionStore.lookup(requestCycle.getRequest());
			if (session != null)
			{
				sessionId = session.getId();
			}
		}

		return sessionId;
	}

	protected boolean hasBufferedResponse(Url url)
	{
		String sessionId = getSessionId();
		boolean hasResponse = false;
		if (Strings.isEmpty(sessionId) == false)
		{
			hasResponse = WebApplication.get().hasBufferedResponse(sessionId, url);
		}
		return hasResponse;
	}

	protected BufferedWebResponse getAndRemoveBufferedResponse(Url url)
	{
		String sessionId = getSessionId();
		BufferedWebResponse response = null;
		if (Strings.isEmpty(sessionId) == false)
		{
			response = WebApplication.get().getAndRemoveBufferedResponse(sessionId, url);
		}
		return response;
	}

	private Request getRequest(Request original)
	{
		// The buffers are stored under "real" URL which can be different
		// than the URL handlers get due to global URL pre/postprocessing
		// (i.e. prepending URL with language segment).
		// Because of that we need find out the real URL from request cycle

		if (RequestCycle.get() != null)
		{
			return RequestCycle.get().getRequest();
		}
		else
		{
			return original;
		}
	}

	/**
	 * @see org.apache.wicket.request.IRequestMapper#mapRequest(org.apache.wicket.request.Request)
	 */
	@Override
	public IRequestHandler mapRequest(Request request)
	{
		request = getRequest(request);

		BufferedWebResponse response = getAndRemoveBufferedResponse(request.getUrl());
		if (response != null)
		{
			return new BufferedResponseRequestHandler(response);
		}
		else
		{
			return null;
		}
	}

	/**
	 * @see org.apache.wicket.request.IRequestMapper#mapHandler(org.apache.wicket.request.IRequestHandler)
	 */
	@Override
	public Url mapHandler(IRequestHandler requestHandler)
	{
		return null;
	}

	/**
	 * @see org.apache.wicket.request.IRequestMapper#getCompatibilityScore(org.apache.wicket.request.Request)
	 */
	@Override
	public int getCompatibilityScore(Request request)
	{
		request = getRequest(request);

		if (hasBufferedResponse(request.getUrl()))
		{
			return Integer.MAX_VALUE;
		}
		else
		{
			return 0;
		}
	}
}