dk.nsi.minlog.ws.web.IsAlive.java Source code

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Here is the source code for dk.nsi.minlog.ws.web.IsAlive.java

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/**
 * The MIT License
 *
 * Original work sponsored and donated by National Board of e-Health (NSI), Denmark (http://www.nsi.dk)
 *
 * Copyright (C) 2011 National Board of e-Health (NSI), Denmark (http://www.nsi.dk)
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy of
 * this software and associated documentation files (the "Software"), to deal in
 * the Software without restriction, including without limitation the rights to
 * use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies
 * of the Software, and to permit persons to whom the Software is furnished to do
 * so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in all
 * copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */
package dk.nsi.minlog.ws.web;

import java.io.IOException;
import java.sql.Connection;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;

import javax.inject.Inject;
import javax.servlet.jsp.JspWriter;
import javax.sql.DataSource;

import org.springframework.stereotype.Repository;

/**
 * Service to check if everything is okey.
 *
 * @author kpi
 *
 */
@Repository("isAlive")
public class IsAlive {

    @Inject
    DataSource dataSource;

    /**
     * Checks if we have access to the database by doing a simple query.
     *
     * @param out Writes out the result to this jsp writer.
     * @throws IOException
     * @throws SQLException
     */
    public void checkAll(JspWriter out) throws IOException, SQLException {
        Statement statement = null;
        Connection connection = null;

        try {
            // Checking database connection
            connection = dataSource.getConnection();
            statement = connection.createStatement();

            ResultSet rs = statement.executeQuery("SELECT 1");
            if (!rs.next() || rs.getInt(1) != 1) {
                throw new RuntimeException("Invalid result from database");
            }
        } finally {
            try {
                if (statement != null)
                    statement.close();
            } finally {
                if (connection != null)
                    connection.close();
            }
        }
    }
}