org.codice.ddf.status.MemoryService.java Source code

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Here is the source code for org.codice.ddf.status.MemoryService.java

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/*
 * Copyright (c) 2012, Codice Foundation. All rights reserved.
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 3 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
 * MA 02110-1301  USA
 */

package org.codice.ddf.status;

import java.io.IOException;
import java.io.PrintWriter;
import java.util.Calendar;
import java.util.LinkedHashMap;
import java.util.Map;
import java.util.logging.Level;
import java.util.logging.Logger;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.hyperic.sigar.Mem;
import org.hyperic.sigar.Sigar;
import org.hyperic.sigar.SigarException;
import org.json.simple.JSONValue;

public class MemoryService extends HttpServlet {

    private static final long serialVersionUID = 1L;
    private static Logger logger = Logger.getLogger("org.codice.ddf.MemoryService");

    protected void doGet(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        PrintWriter writer = response.getWriter();
        writer.append(toJSON());
    }

    static Map<String, Object> getMemoryStatus() {

        Map<String, Object> obj = new LinkedHashMap<String, Object>();

        Sigar sigar = null;
        try {
            sigar = new Sigar();
            // call it to make sure the library was loaded
            sigar.getPid();
            Mem mem = null;
            try {
                mem = sigar.getMem();
            } catch (SigarException se) {
                se.printStackTrace();
            }
            obj.put("data", mem.toMap());
            obj.put("type", "mem");
            obj.put("time", new java.sql.Timestamp(Calendar.getInstance().getTime().getTime()).toString());

            sigar.close();
        } catch (Throwable t) {
            logger.log(Level.SEVERE, "Failed to load sigar", t);
            if (sigar != null) {
                try {
                    sigar.close();
                } catch (Throwable t1) {
                    // ignore
                } finally {
                    sigar = null;
                }
            }
        }

        return obj;
    }

    static String toJSON() {
        return JSONValue.toJSONString(getMemoryStatus());
    }
}