/*
 * Copyright (c) 2002-2020 Manorrock.com. All Rights Reserved.
 *
 * Redistribution and use in source and binary forms, with or without 
 * modification, are permitted provided that the following conditions are met:
 *
 *   1. Redistributions of source code must retain the above copyright notice, 
 *      this list of conditions and the following disclaimer.
 *   2. Redistributions in binary form must reproduce the above copyright
 *      notice, this list of conditions and the following disclaimer in the
 *      documentation and/or other materials provided with the distribution.
 *   3. Neither the name of the copyright holder nor the names of its 
 *      contributors may be used to endorse or promote products derived from
 *      this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" 
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE 
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */
package cloud.piranha.smallrye.health;

import io.smallrye.health.SmallRyeHealth;
import io.smallrye.health.SmallRyeHealthReporter;
import java.io.IOException;
import javax.inject.Inject;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

/**
 * The Smallrye Health Servlet.
 *
 * @author Manfred Riem ([email protected])
 */
@WebServlet(name = "SmallRyeHealthServlet", urlPatterns = "/health")
public class SmallRyeHealthServlet extends HttpServlet {

    /**
     * Stores the Health reporter.
     */
    @Inject
    private SmallRyeHealthReporter reporter;

    /**
     * Handle the GET request.
     *
     * @param request the HTTP servlet request.
     * @param response the HTTP servlet response.
     * @throws IOException when an I/O error occurs.
     */
    @Override
    protected void doGet(HttpServletRequest request, HttpServletResponse response)
            throws IOException {
        SmallRyeHealth health = reporter.getHealth();
        if (health.isDown()) {
            response.setStatus(503);
        }
        response.setContentType("application/json");
        response.setCharacterEncoding("UTF-8");
        reporter.reportHealth(response.getOutputStream(), health);
    }
}