/*
* JBoss, Home of Professional Open Source.
* Copyright 2012 Red Hat, Inc., and individual contributors
* as indicated by the @author tags.
*
* 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 io.undertow.servlet.core;
import java.io.IOException;
import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.ServletContext;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import io.undertow.servlet.UndertowServletMessages;
import io.undertow.servlet.api.FilterInfo;
import io.undertow.servlet.api.InstanceHandle;
import io.undertow.servlet.spec.FilterConfigImpl;
/**
* @author Stuart Douglas
*/
public class ManagedFilter implements Lifecycle {
private final FilterInfo filterInfo;
private final ServletContext servletContext;
private volatile boolean started = false;
private volatile Filter filter;
private volatile InstanceHandle<? extends Filter> handle;
public ManagedFilter(final FilterInfo filterInfo, final ServletContext servletContext) {
this.filterInfo = filterInfo;
this.servletContext = servletContext;
}
public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException {
if (!started) {
start();
}
getFilter().doFilter(request, response, chain);
}
private Filter getFilter() throws ServletException {
if (filter == null) {
synchronized (this) {
if (filter == null) {
try {
handle = filterInfo.getInstanceFactory().createInstance();
} catch (Exception e) {
throw UndertowServletMessages.MESSAGES.couldNotInstantiateComponent(filterInfo.getName(), e);
}
Filter filter = handle.getInstance();
filter.init(new FilterConfigImpl(filterInfo, servletContext));
this.filter = filter;
}
}
}
return filter;
}
public synchronized void start() throws ServletException {
if (!started) {
started = true;
}
}
public synchronized void stop() {
started = false;
if (handle != null) {
filter.destroy();
handle.release();
}
filter = null;
handle = null;
}
@Override
public boolean isStarted() {
return started;
}
public FilterInfo getFilterInfo() {
return filterInfo;
}
}