/*
Copyright (c) 2012 LinkedIn Corp.
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 com.linkedin.restli.server.guice;
import com.google.inject.Inject;
import com.google.inject.Singleton;
import com.linkedin.parseq.Engine;
import com.linkedin.r2.filter.FilterChain;
import com.linkedin.r2.filter.FilterChains;
import com.linkedin.r2.filter.transport.FilterChainDispatcher;
import com.linkedin.r2.transport.http.server.RAPServlet;
import com.linkedin.restli.server.DelegatingTransportDispatcher;
import com.linkedin.restli.server.RestLiConfig;
import com.linkedin.restli.server.RestLiServer;
import java.io.IOException;
import javax.servlet.ServletConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.http.HttpServlet;
/**
* RestliServlet for Guice.
*
* This class is intended to be instantiated by Guice and exposed to a servlet container via Guice's ServletModule.
*
* @author jpbetz
*/
@Singleton
public class GuiceRestliServlet extends HttpServlet
{
private static final long serialVersionUID = 1L;
private final HttpServlet _r2Servlet;
@Inject
public GuiceRestliServlet(RestLiConfig config, // required
GuiceInjectResourceFactory resourceFactory, // injected automatically by Guice
OptionalFilterChain filterChain,
OptionalEngine engine)
{
_r2Servlet = new RAPServlet(
new FilterChainDispatcher(
new DelegatingTransportDispatcher(
new RestLiServer(config, resourceFactory, engine.value)),
filterChain.value
)
);
}
// Handle optional params, this is somewhat burdonsome to express in Guice, for details see:
// https://code.google.com/p/google-guice/wiki/FrequentlyAskedQuestions#How_can_I_inject_optional_parameters_into_a_constructor?
public static class OptionalFilterChain {
@Inject(optional = true)
public FilterChain value = FilterChains.empty();
}
public static class OptionalEngine {
@Inject(optional = true)
public Engine value = null;
}
@Override
public void init(ServletConfig servletConfig) throws ServletException
{
super.init(servletConfig);
_r2Servlet.init(servletConfig);
}
@Override
public void destroy()
{
_r2Servlet.destroy();
}
@Override
public void service(ServletRequest req, ServletResponse res) throws ServletException, IOException
{
_r2Servlet.service(req, res);
}
}