src/wa/server/page/ServicePage.tmpl

@@ -0,0 +1,133 @@
+<div class="col-md-12"><div class="panel panel-default">
+    <div class="panel-heading">Cpu Status</div>
+    <div class="panel-body">
+        <div><canvas id="cpu-chart" height="300"></canvas></div>
+    </div>
+</div></div>
+<div class="col-md-4"><div class="panel panel-default">
+    <div class="panel-heading">Memory</div>
+    <div class="panel-body">
+        <center><canvas id="mem-chart" height="300"></canvas></center>
+        <br>
+        <table class="table">
+            <tr><th></th><th>Used</th><th>Free</th></tr>
+            <tr><th><b>Memory</b></th>
+                <td id="mem-used"></td><td id="mem-free"></td></tr>
+            <tr><th><b>Swap</b></th>
+                <td id="swap-used"></td><td id="swap-free"></td></tr>
+        </table>
+    </div>
+</div></div>
+<div class="col-md-8"><div class="panel panel-default">
+    <div class="panel-heading">Process List</div>
+    <div class="panel-body">
+        <table id="proc-list" class="table table-hover small" data-sort-name="cpu" data-sort-order="desc">
+            <thead>
+                <tr>
+                    <th data-field="pid"     data-sortable="true"><b>PID</b></th>
+                    <th data-field="user"    data-sortable="true">User</th>
+                    <th data-field="cpu"     data-sortable="true">CPU</th>
+                    <th data-field="cputime" data-sortable="true">CpuTime</th>
+                    <th data-field="mem"     data-sortable="true">Memory(MB)</th>
+                    <th data-field="cmd"     data-sortable="true" style="word-wrap: break-word;">Proc</th>
+                </tr>
+            </thead>
+        </table>
+    </div>
+</div></div>
+
+<script language="javascript" type="text/javascript">
+
+$(function() {
+    updateCpuChart();
+    updateMemChart();
+    updateProcTable();
+});
+
+
+var cpu_chart = null;
+var cpu_data = {
+    labels : ["","","","","","","","","","",
+        "","","","","","","","","","",
+        "","","","","","","","","","",],
+    datasets: []
+};
+
+function updateCpuChart(){
+    $.getJSON("{{nav.url}}&json&cpu", function( data ) {
+        // Setup graph
+        if(cpu_chart == null){
+            // Fill in cpus
+            for(i=0; i<data['cpu'].length; ++i){
+                cpu_data['datasets'].push({
+                    strokeColor: "rgba(151,187,205,1)",
+                    fillColor: "rgba(151,187,205,0.2)",
+                    data: [0,0,0,0,0,0,0,0,0,0,0,
+                        0,0,0,0,0,0,0,0,0,0,0,
+                        0,0,0,0,0,0,0,0,0,0,0]
+                });
+            }
+            // Graph
+            var ctx = $("#cpu-chart").get(0).getContext("2d");
+            cpu_chart = new Chart(ctx).Line(cpu_data, {
+                responsive: true,
+                maintainAspectRatio: false, // Fixes stuped behaviour with size
+                datasetFill: true, pointDot: false, showTooltips: false,
+                scaleOverride: true, scaleStartValue: 0, scaleStepWidth: 0.1, scaleSteps: 10, scaleIntegersOnly: false,
+                animation : false,
+            });
+        }
+
+        // Update graph
+        cpu_chart.addData(data['cpu'], "");
+        cpu_chart.removeData();
+    });
+    setTimeout(updateCpuChart, 2000);
+}
+
+
+var mem_chart = null;
+var mem_data = [
+    {
+        value: 0,
+        color:"#46BFBD",
+        highlight: "#5AD3D1",
+        label: "Used"
+    },{
+        value: 1,
+        color: "#EEEEEE",
+        highlight: "#DDDDDD",
+        label: "Free"
+    }
+];
+
+function updateMemChart(){
+    $.getJSON("{{nav.url}}&json&memory", function( data ) {
+        if(mem_chart == null){
+            var ctx = $("#mem-chart").get(0).getContext("2d");
+            mem_chart = new Chart(ctx).Doughnut(mem_data, {
+                animateScale: true
+            });
+        }
+        mem_chart.segments[0].value = data.memory.used;
+        mem_chart.segments[1].value = data.memory.free;
+        mem_chart.update();
+
+        $("#mem-used").html(data.memory.used + " MB");
+        $("#mem-free").html(data.memory.free + " MB");
+        $("#swap-used").html(data.swap.used + " MB");
+        $("#swap-free").html(data.swap.free + " MB");
+    });
+    setTimeout(updateMemChart, 5000);
+}
+
+
+function updateProcTable(){
+    $.getJSON("{{nav.url}}&json&proc", function( data ) {
+        $('#proc-list').bootstrapTable({
+            data: data['proc']
+        });
+    });
+    setTimeout(updateProcTable, 10000);
+}
+</script>

src/wa/server/page/ServicesPage.java

@@ -26,18 +26,26 @@ import wa.server.WAAbstractPage;
 import wa.server.WAContext;
 import wa.server.page.struct.WANavigation;
 import wa.server.plugin.WAService;
+import zutil.io.file.FileUtil;
+import zutil.log.LogUtil;
 import zutil.net.http.HttpHeaderParser;
 import zutil.parser.DataNode;
 import zutil.parser.Templator;
 import zutil.plugin.PluginManager;
 
+import java.io.IOException;
 import java.util.ArrayList;
 import java.util.Map;
+import java.util.logging.Level;
+import java.util.logging.Logger;
 
 /**
  * Created by Ziver on 2015-04-06.
  */
 public class ServicesPage implements WAPage {
+    private static final Logger log = LogUtil.getLogger();
+    private static final String TMPL_FILE = "";
+
     private ArrayList<WAService> plugins;
 
     public ServicesPage(PluginManager pluginManager){
@@ -56,6 +64,18 @@ public class ServicesPage implements WAPage {
                                   Map<String, Object> session,
                                   Map<String, String> cookie,
                                   Map<String, String> request) {
+
+        try {
+            WAService obj = getPlugin(context);
+
+            if (obj != null) {
+                Templator tmpl = new Templator(FileUtil.find(TMPL_FILE));
+                tmpl.set("nav", context.getBreadcrumb().get(1));
+                return tmpl;
+            }
+        }catch (IOException e){
+            log.log(Level.SEVERE, null, e);
+        }
         return null;
     }
 
@@ -64,6 +84,17 @@ public class ServicesPage implements WAPage {
                                  Map<String, Object> session,
                                  Map<String, String> cookie,
                                  Map<String, String> request){
+
+        return null;
+    }
+
+
+    private WAService getPlugin(WAContext context){
+        if(context.getBreadcrumb().size() >= 2){
+            int i = plugins.indexOf(context.getBreadcrumb().get(1).getResource());
+            if(i >= 0)
+                return plugins.get(i);
+        }
         return null;
     }
 

src/wa/server/plugin/WAService.java

@@ -1,15 +1,16 @@
 package wa.server.plugin;
 
 public interface WAService {
-	public enum WAServiceStatus{
-		RUNNING,
-		NOT_RESPONDING,
-		UNAVAILABLE,
-		UNKNOWN
-	}
 
 	public String getName();
-	public void start();
-	public void stop();
+
+	/**
+	 * @return a service status object or null if it is not possible to check status
+	 */
 	public WAServiceStatus getStatus();
+
+    /**
+     * @return a installer object that will install the service or null if the installer is not available
+     */
+    public WAInstaller getInstaller();
 }

src/wa/server/plugin/WAServiceStatus.java

@@ -0,0 +1,36 @@
+/*
+ * Copyright (c) 2015 Ziver
+ *
+ * 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 wa.server.plugin;
+
+public interface WAServiceStatus {
+	public enum ServiceStatusType{
+		RUNNING,
+		NOT_RESPONDING,
+		UNAVAILABLE,
+		UNKNOWN
+	}
+
+	public void start();
+	public void stop();
+	public ServiceStatusType getStatus();
+}

src/wa/server/plugin/apache/ApacheInstaller.java

@@ -30,14 +30,15 @@ import zutil.osal.OSAbstractionLayer;
  * Created by Ziver on 2014-11-09.
  */
 public class ApacheInstaller implements WAInstaller {
+    private static final String PACKAGES = "apache php5 php5-mcrypt php5-gd imagemagick";
 
     @Override
     public void install() {
-        AptGet.install("apache php5 php5-mcrypt php5-gd imagemagick");
+        AptGet.install(PACKAGES);
     }
 
     @Override
     public void uninstall() {
-        AptGet.purge("apache php5 php5-mcrypt php5-gd imagemagick");
+        AptGet.purge(PACKAGES);
     }
 }

src/wa/server/plugin/apache/ApacheService.java

@@ -22,7 +22,10 @@
 
 package wa.server.plugin.apache;
 
+import wa.server.plugin.WAInstaller;
 import wa.server.plugin.WAService;
+import wa.server.plugin.WAServiceStatus;
+import wa.server.util.AptGet;
 import wa.server.util.Ps;
 import zutil.io.file.FileUtil;
 import zutil.log.LogUtil;
@@ -39,35 +42,25 @@ import java.util.logging.Logger;
 public class ApacheService implements WAService {
     private static Logger log = LogUtil.getLogger();
 
-    private static OSAbstractionLayer os = OSAbstractionLayer.getInstance();
-    private static final String PID_FILE = "/var/run/apache2.pid";
+    private ApacheStatus status;
+    private ApacheInstaller installer;
 
     @Override
     public String getName() {
         return "Apache2";
     }
 
-    @Override
-    public void start() {
-        os.runCommand("service apache2 start");
-    }
-
-    @Override
-    public void stop() {
-        os.runCommand("service apache2 stop");
-    }
-
     @Override
     public WAServiceStatus getStatus() {
-        try {
-            int pid = Integer.parseInt(
-                    FileUtil.getContent(new File(PID_FILE)));
-            if(Ps.isRunning(pid))
-                return WAServiceStatus.RUNNING;
-            return WAServiceStatus.UNAVAILABLE;
-        }catch(IOException e){
-            log.log(Level.WARNING, null, e);
+        if(status == null)
+            status = new ApacheStatus();
+        return status;
     }
-        return WAServiceStatus.UNKNOWN;
+
+    @Override
+    public WAInstaller getInstaller() {
+        if(installer == null)
+            installer = new ApacheInstaller();
+        return installer;
     }
 }

src/wa/server/plugin/apache/ApacheStatus.java

@@ -0,0 +1,64 @@
+/*
+ * Copyright (c) 2015 Ziver
+ *
+ * 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 wa.server.plugin.apache;
+
+import wa.server.plugin.WAServiceStatus;
+import wa.server.util.Ps;
+import zutil.io.file.FileUtil;
+import zutil.log.LogUtil;
+import zutil.osal.OSAbstractionLayer;
+
+import java.io.File;
+import java.io.IOException;
+import java.util.logging.Level;
+import java.util.logging.Logger;
+
+public class ApacheStatus implements WAServiceStatus {
+    private static final Logger log = LogUtil.getLogger();
+    private static OSAbstractionLayer os = OSAbstractionLayer.getInstance();
+    private static final String PID_FILE = "/var/run/apache2.pid";
+
+    @Override
+    public void start() {
+        os.runCommand("service apache2 start");
+    }
+
+    @Override
+    public void stop() {
+        os.runCommand("service apache2 stop");
+    }
+
+    @Override
+    public ServiceStatusType getStatus() {
+        try {
+            int pid = Integer.parseInt(
+                    FileUtil.getContent(new File(PID_FILE)));
+            if(Ps.isRunning(pid))
+                return ServiceStatusType.RUNNING;
+            return ServiceStatusType.UNAVAILABLE;
+        }catch(IOException e){
+            log.log(Level.WARNING, null, e);
+        }
+        return ServiceStatusType.UNKNOWN;
+    }
+}

src/wa/server/plugin/apache/plugin.json

@@ -2,8 +2,6 @@
 	"version": "1.0",
 	"name": "Apache Web Server",
 	"interfaces": {
-		"wa.server.plugin.WAInstaller": "wa.server.plugin.apache.ApacheInstaller",
-		"wa.server.plugin.WAConfigurator": "wa.server.plugin.apache.ApacheConfigurator",
 		"wa.server.plugin.WAService": "wa.server.plugin.apache.ApacheService"
 	}
 }

src/wa/server/util/ProcDiskstats.java

@@ -0,0 +1,215 @@
+/*
+ * Copyright (c) 2015 ezivkoc
+ *
+ * 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 wa.server.util;
+
+import zutil.log.LogUtil;
+
+import java.io.*;
+import java.util.HashMap;
+import java.util.logging.Level;
+import java.util.logging.Logger;
+
+/**
+ * Documentation from https://www.kernel.org/doc/Documentation/block/stat.txt
+ *
+ * Created by ezivkoc on 2015-05-19.
+ */
+public class ProcDiskstats {
+    private static final Logger log = LogUtil.getLogger();
+    private static final String PROC_PATH = "/proc/diskstats";
+    private static final int TTL = 500; // update stats every 0.5 second
+
+    private static HashMap<String, HddStats> hdds = new HashMap<String, HddStats>();
+    private static long updateTimestamp;
+
+
+    private synchronized static void update(){
+        if(System.currentTimeMillis() - updateTimestamp < TTL)
+            return;
+        updateTimestamp = System.currentTimeMillis();
+        try {
+            BufferedReader in = new BufferedReader(new FileReader(PROC_PATH));
+            String line = null;
+            while((line=in.readLine()) != null){
+                String[] str = line.split("\\w*", 4);
+                if(str.length >= 4) {
+                    String devName = str[2];
+                    if(!hdds.containsKey(devName)){
+                        HddStats hdd = new HddStats(devName);
+                        hdds.put(hdd.getDevName(), hdd);
+                    }
+                    hdds.get(devName).update(str[3]);
+                }
+            }
+            in.close();
+        } catch (IOException e) {
+            log.log(Level.SEVERE, null, e);
+        }
+    }
+
+    public static HddStats getStats(String devName){
+        update();
+        return hdds.get(devName);
+    }
+
+
+    public static class HddStats {
+        private String devName;
+        //read I/Os       requests      number of read I/Os processed
+        private long readIO = -1;
+        //read merges     requests      number of read I/Os merged with in-queue I/O
+        private long readMerges = -1;
+        //read sectors    sectors       number of sectors read
+        private long readSectors = -1;
+        //read ticks      milliseconds  total wait time for read requests
+        private long readTicks = -1;
+        //write I/Os      requests      number of write I/Os processed
+        private long writeIO = -1;
+        //write merges    requests      number of write I/Os merged with in-queue I/O
+        private long writeMerges = -1;
+        //write sectors   sectors       number of sectors written
+        private long writeSectors = -1;
+        //write ticks     milliseconds  total wait time for write requests
+        private long writeTicks = -1;
+        //in_flight       requests      number of I/Os currently in flight
+        private long inFlight = -1;
+        //io_ticks        milliseconds  total time this block device has been active
+        private long ioTicks = -1;
+        //time_in_queue   milliseconds  total wait time for all requests
+        private long timeInQueue = -1;
+
+        protected HddStats(String devName) {
+            this.devName = devName;
+        }
+        protected void update(String line){
+            String[] stats = line.split("\\w*");
+            if(stats.length >= 11){
+                readIO =       Long.parseLong(stats[0]);
+                readMerges =   Long.parseLong(stats[1]);
+                readSectors =  Long.parseLong(stats[2]);
+                readTicks =    Long.parseLong(stats[3]);
+                writeIO =      Long.parseLong(stats[4]);
+                writeMerges =  Long.parseLong(stats[5]);
+                writeSectors = Long.parseLong(stats[6]);
+                writeTicks =   Long.parseLong(stats[7]);
+                inFlight =     Long.parseLong(stats[8]);
+                ioTicks =      Long.parseLong(stats[9]);
+                timeInQueue =  Long.parseLong(stats[10]);
+            }
+        }
+
+
+        public String getDevName() {
+            return devName;
+        }
+        /**
+         * This values increment when an I/O request completes.
+         */
+        public long getReadIO() {
+            return readIO;
+        }
+        /**
+         * This value increment when an I/O request is merged with an
+         * already-queued I/O request.
+         */
+        public long getReadMerges() {
+            return readMerges;
+        }
+        /**
+         * This value count the number of sectors read from to this
+         * block device.  The "sectors" in question are the standard UNIX 512-byte
+         * sectors, not any device- or filesystem-specific block size.  The
+         * counter is incremented when the I/O completes.
+         */
+        public long getReadSectors() {
+            return readSectors;
+        }
+        /**
+         * This value count the number of milliseconds that I/O requests have
+         * waited on this block device.  If there are multiple I/O requests waiting,
+         * this value will increase at a rate greater than 1000/second; for
+         * example, if 60 read requests wait for an average of 30 ms, the read_ticks
+         * field will increase by 60*30 = 1800.
+         */
+        public long getReadTicks() {
+            return readTicks;
+        }
+        /**
+         * This values increment when an I/O request completes.
+         */
+        public long getWriteIO() {
+            return writeIO;
+        }
+        /**
+         * This value increment when an I/O request is merged with an
+         * already-queued I/O request.
+         */
+        public long getWriteMerges() {
+            return writeMerges;
+        }
+        /**
+         * This value count the number of sectors written to this
+         * block device.  The "sectors" in question are the standard UNIX 512-byte
+         * sectors, not any device- or filesystem-specific block size.  The
+         * counter is incremented when the I/O completes.
+         */
+        public long getWriteSectors() {
+            return writeSectors;
+        }
+        /**
+         * This value count the number of milliseconds that I/O requests have
+         * waited on this block device.  If there are multiple I/O requests waiting,
+         * this value will increase at a rate greater than 1000/second; for
+         * example, if 60 write requests wait for an average of 30 ms, the write_ticks
+         * field will increase by 60*30 = 1800.
+         */
+        public long getWriteTicks() {
+            return writeTicks;
+        }
+        /**
+         * This value counts the number of I/O requests that have been issued to
+         * the device driver but have not yet completed.  It does not include I/O
+         * requests that are in the queue but not yet issued to the device driver.
+         */
+        public long getInFlight() {
+            return inFlight;
+        }
+        /**
+         * This value counts the number of milliseconds during which the device has
+         * had I/O requests queued.
+         */
+        public long getIoTicks() {
+            return ioTicks;
+        }
+        /**
+         * This value counts the number of milliseconds that I/O requests have waited
+         * on this block device.  If there are multiple I/O requests waiting, this
+         * value will increase as the product of the number of milliseconds times the
+         * number of requests waiting (see "read ticks" above for an example).
+         */
+        public long getTimeInQueue() {
+            return timeInQueue;
+        }
+    }
+
+}

src/wa/server/util/ProcStat.java

@@ -0,0 +1,193 @@
+/*
+ * Copyright (c) 2015 ezivkoc
+ *
+ * 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 wa.server.util;
+
+import zutil.log.LogUtil;
+
+import java.io.BufferedReader;
+import java.io.FileReader;
+import java.io.IOException;
+import java.util.ArrayList;
+import java.util.Iterator;
+import java.util.logging.Level;
+import java.util.logging.Logger;
+
+/**
+ * Documentation from https://www.kernel.org/doc/Documentation/block/stat.txt
+ *
+ * Created by ezivkoc on 2015-05-19.
+ */
+public class ProcStat {
+    private static final Logger log = LogUtil.getLogger();
+    private static final String PROC_PATH = "/proc/stat";
+    private static final int TTL = 500; // update stats every 0.5 second
+
+    private static CpuStats cpuTotal = new CpuStats();
+    private static ArrayList<CpuStats> cpus = new ArrayList<CpuStats>();
+    private static long uptime;
+    private static long processes;
+    private static long updateTimestamp;
+
+
+    private synchronized static void update(){
+        if(System.currentTimeMillis() - updateTimestamp < TTL)
+            return;
+        updateTimestamp = System.currentTimeMillis();
+        try {
+            BufferedReader in = new BufferedReader(new FileReader(PROC_PATH));
+            String line = null;
+            while((line=in.readLine()) != null){
+                String[] str = line.split("\\w*");
+                if(str[0].equals("cpu"))
+                    cpuTotal.update(str);
+                else if(str[0].startsWith("cpu")){
+                    int cpuId = Integer.parseInt(str[0].substring(3));
+                    if(cpus.size() < cpuId)
+                        cpus.add(new CpuStats());
+                    cpus.get(cpuId).update(str);
+                }
+                else if(str[0].startsWith("btime")){
+                    uptime = Long.parseLong(str[1]);
+                }
+                else if(str[0].startsWith("processes")){
+                    processes = Long.parseLong(str[1]);
+                }
+            }
+            in.close();
+        } catch (IOException e) {
+            log.log(Level.SEVERE, null, e);
+        }
+    }
+
+    public static CpuStats getTotalCpuStats(){
+        update();
+        return cpuTotal;
+    }
+    public static Iterator<CpuStats> getCpuStats(){
+        update();
+        return cpus.iterator();
+    }
+    /**
+     * @return the time at which the system booted, in seconds since the Unix epoch.
+     */
+    public static long getUptime(){
+        update();
+        return uptime;
+    }
+    /**
+     * @return the number of processes and threads created, which includes (but is not limited to) those created by calls to the fork() and clone() system calls.
+     */
+    public static long getProcesses(){
+        update();
+        return processes;
+    }
+
+
+
+    public static class CpuStats {
+        // normal processes executing in user mode
+        private long user;
+        // processes executing in kernel mode
+        private long system;
+        // twiddling thumbs
+        private long idle;
+        // waiting for I/O to complete
+        private long iowait;
+        private long steal;
+        // virtual processes
+        private long guest;
+        private long total;
+
+        // Percentage
+        private float load_total;
+        private float load_user;
+        private float load_system;
+        private float load_iowait;
+        private float load_virtual;
+
+        protected CpuStats(){}
+        protected void update(String[] stats){
+            long newUser=0, newNice=0, newSystem=0, newIdle=0, newIowait=0, newIrq=0, newSoftirq=0, newSteal=0, newGuest=0, newGuestNice=0;
+            if(stats.length >= 1+8){
+                newUser =    Long.parseLong(stats[1]);
+                newNice =    Long.parseLong(stats[2]);
+                newSystem =  Long.parseLong(stats[3]);
+                newIdle =    Long.parseLong(stats[4]);
+                newIowait =  Long.parseLong(stats[5]);
+                newIrq =     Long.parseLong(stats[6]);
+                newSoftirq = Long.parseLong(stats[7]);
+                if(stats.length >= 1+8+3){
+                    newSteal =     Long.parseLong(stats[8]);
+                    newGuest =     Long.parseLong(stats[9]);
+                    newGuestNice = Long.parseLong(stats[10]);
+                }
+
+                // Summarize
+                newUser = newUser + newNice - newGuest - newGuestNice;
+                newSystem = newSystem + newIrq + newSoftirq;
+                newGuest = newGuest + newGuestNice;
+
+                // Calculate the diffs
+                long userDiff = newUser - user;
+                long idleDiff = (newIdle + newIowait) - (idle + iowait);
+                long systemDiff = newSystem - system;
+                long stealDiff = newSteal - steal;
+                long virtualDiff = newGuest - guest;
+                long newTotal = userDiff + systemDiff + idleDiff + stealDiff + virtualDiff;
+                // Calculate load
+                load_total = (float)(newTotal-idleDiff)/newTotal;
+                load_user = (float)userDiff/newTotal;
+                load_system = (float)systemDiff/newTotal;
+                load_iowait = (float)(newIowait - iowait)/newTotal;
+                load_virtual = (float)virtualDiff/newTotal;
+
+                // update old values
+                user = newUser;
+                system = newSystem;
+                idle = newIdle;
+                iowait = newIowait;
+                steal = newSteal;
+                guest = newGuest;
+                total = newTotal;
+            }
+        }
+
+        public float getTotalLoad() {
+            return load_total;
+        }
+        public float getUserLoad() {
+            return load_user;
+        }
+        public float getSystemLoad() {
+            return load_system;
+        }
+        public float getIOWaitLoad() {
+            return load_iowait;
+        }
+        public float getVirtualLoad() {
+            return load_virtual;
+        }
+
+    }
+
+}