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package org.atmosphere.cpr;
import org.atmosphere.container.BlockingIOCometSupport;
import org.atmosphere.cpr.AtmosphereServlet.Action;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletConfig;
import javax.servlet.ServletContext;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.util.Enumeration;
/**
* Atmosphere supports for {@link Filter}, delegating all works to {@link AtmosphereServlet}.
* This {@link Filter} only works with Jetty and Grizzly/GlassFish. With others
* containers it will use its {@link BlockingIOCometSupport}.
*
* @author Jeanfrancois Arcand
*/
public class AtmosphereFilter implements Filter {
private static final Logger logger = LoggerFactory.getLogger(AtmosphereFilter.class);
private final AtmosphereServlet as;
public AtmosphereFilter() {
as = new AtmosphereServlet(true);
}
/**
* Initialize the {@link Filter}
*
* @param filterConfig The {@link javax.servlet.FilterConfig}
* @throws ServletException
*/
public void init(final FilterConfig filterConfig) throws ServletException {
logger.info("AtmosphereServlet running as a Filter");
as.init(new ServletConfig() {
public String getServletName() {
return filterConfig.getFilterName();
}
public ServletContext getServletContext() {
return filterConfig.getServletContext();
}
public String getInitParameter(String name) {
return filterConfig.getInitParameter(name);
}
public Enumeration<String> getInitParameterNames() {
return filterConfig.getInitParameterNames();
}
});
}
/**
* Normal doFilter invokation.
*
* @param request
* @param response
* @param chain
* @throws IOException
* @throws ServletException
*/
public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain)
throws IOException, ServletException {
Action a = as.doCometSupport((HttpServletRequest) request, (HttpServletResponse) response);
if (a == null || a.type != Action.TYPE.SUSPEND) {
chain.doFilter(request, response);
}
}
public void destroy() {
as.destroy();
}
}