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/*
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
*
* Copyright (c) 2011-2012 Oracle and/or its affiliates. All rights reserved.
*
* The contents of this file are subject to the terms of either the GNU
* General Public License Version 2 only ("GPL") or the Common Development
* and Distribution License("CDDL") (collectively, the "License"). You
* may not use this file except in compliance with the License. You can
* obtain a copy of the License at
* https://glassfish.dev.java.net/public/CDDL+GPL_1_1.html
* or packager/legal/LICENSE.txt. See the License for the specific
* language governing permissions and limitations under the License.
*
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* file and include the License file at packager/legal/LICENSE.txt.
*
* GPL Classpath Exception:
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* exception as provided by Oracle in the GPL Version 2 section of the License
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*
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*/
package org.glassfish.grizzly.servlet;
import org.glassfish.grizzly.Grizzly;
import org.glassfish.grizzly.localization.LogMessages;
import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.Servlet;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletRequestEvent;
import javax.servlet.ServletRequestListener;
import javax.servlet.ServletResponse;
import java.io.IOException;
import java.util.EventListener;
import java.util.logging.Level;
import java.util.logging.Logger;
/**
* Implementation of javax.servlet.FilterChain used to manage
* the execution of a set of filters for a particular request. When the
* set of defined filters has all been executed, the next call to
* doFilter() will execute the servlet's service()
* method itself.
*
* @author Craig R. McClanahan
*/
final class FilterChainImpl implements FilterChain, FilterChainInvoker {
private static final Logger LOGGER = Grizzly.logger(FilterChainImpl.class);
/**
* The servlet instance to be executed by this chain.
*/
private final Servlet servlet;
private final WebappContext ctx;
private final Object lock = new Object();
private int n;
private FilterRegistration[] filters = new FilterRegistration[0];
/**
* The int which is used to maintain the current position
* in the filter chain.
*/
private int pos;
public FilterChainImpl(final Servlet servlet,
final WebappContext ctx) {
this.servlet = servlet;
this.ctx = ctx;
}
// ---------------------------------------------------- FilterChain Methods
public void invokeFilterChain(ServletRequest request, ServletResponse response)
throws IOException, ServletException {
ServletRequestEvent event =
new ServletRequestEvent(ctx, request);
try {
requestInitialized(event);
pos = 0;
doFilter(request, response);
} finally {
requestDestroyed(event);
}
}
/**
* Invoke the next filter in this chain, passing the specified request
* and response. If there are no more filters in this chain, invoke
* the service() method of the servlet itself.
*
* @param request The servlet request we are processing
* @param response The servlet response we are creating
*
* @exception java.io.IOException if an input/output error occurs
* @exception javax.servlet.ServletException if a servlet exception occurs
*/
@Override
public void doFilter(ServletRequest request, ServletResponse response)
throws IOException, ServletException {
// Call the next filter if there is one
if (pos < n) {
FilterRegistration registration = filters[pos++];
try {
Filter filter = registration.filter;
filter.doFilter(request, response, this);
} catch (Exception e) {
throw new ServletException(e);
}
return;
}
try {
if (servlet != null) {
servlet.service(request, response);
}
} catch (Exception e) {
throw new ServletException(e);
}
}
// ------------------------------------------------------- Protected Methods
protected void addFilter(final FilterRegistration filterRegistration) {
synchronized (lock) {
if (n == filters.length) {
FilterRegistration[] newFilters =
new FilterRegistration[n + 4];
System.arraycopy(filters, 0, newFilters, 0, n);
filters = newFilters;
}
filters[n++] = filterRegistration;
}
}
// --------------------------------------------------------- Private Methods
private void requestDestroyed(ServletRequestEvent event) {
// TODO don't create the event unless necessary
final EventListener[] listeners = ctx.getEventListeners();
for (int i = 0, len = listeners.length; i < len; i++) {
if (listeners[i] instanceof ServletRequestListener) {
try {
((ServletRequestListener) listeners[i]).requestDestroyed(event);
} catch (Throwable t) {
if (LOGGER.isLoggable(Level.WARNING)) {
LOGGER.log(Level.WARNING,
LogMessages.WARNING_GRIZZLY_HTTP_SERVLET_CONTAINER_OBJECT_DESTROYED_ERROR("requestDestroyed", "ServletRequestListener", listeners[i].getClass().getName()),
t);
}
}
}
}
}
private void requestInitialized(ServletRequestEvent event) {
final EventListener[] listeners = ctx.getEventListeners();
for (int i = 0, len = listeners.length; i < len; i++) {
if (listeners[i] instanceof ServletRequestListener) {
try {
((ServletRequestListener) listeners[i]).requestInitialized(event);
} catch (Throwable t) {
if (LOGGER.isLoggable(Level.WARNING)) {
LOGGER.log(Level.WARNING,
LogMessages.WARNING_GRIZZLY_HTTP_SERVLET_CONTAINER_OBJECT_INITIALIZED_ERROR("requestDestroyed", "ServletRequestListener", listeners[i].getClass().getName()),
t);
}
}
}
}
}
}
