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/*
* 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.tuscany.runtime.webapp;
import java.io.IOException;
import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.ServletContext;
import static org.apache.tuscany.runtime.webapp.Constants.RUNTIME_ATTRIBUTE;
/**
* Maps an incoming request and the current composite context to the composite component for the web application. This
* filter must be applied to all web application urls that execute unmanaged code (e.g. JSPs and Servlets) which
* accesses the Tuscany runtime.
*
* @version $Rev$ $Date$
*/
public class TuscanyFilter implements Filter {
private WebappRuntime runtime;
public void init(FilterConfig config) throws ServletException {
ServletContext servletContext = config.getServletContext();
runtime = (WebappRuntime) servletContext.getAttribute(RUNTIME_ATTRIBUTE);
if (runtime == null) {
throw new ServletException("Tuscany is not configured for the web application");
}
}
public void doFilter(ServletRequest req, ServletResponse resp, FilterChain filterChain)
throws IOException, ServletException {
try {
runtime.startRequest();
filterChain.doFilter(req, resp);
} finally {
runtime.stopRequest();
}
}
public void destroy() {
runtime = null;
}
}
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