src/at/ac/tuwien/lsdc/types/VirtualMachine.java

   1 package at.ac.tuwien.lsdc.types;
   2
   3 import java.util.ArrayList;
   4 import java.util.HashMap;
   5
   6 import at.ac.tuwien.lsdc.exception.VMResizeException;
   7
   8 public class VirtualMachine {
   9
  10         public enum VMType {
  11                 Resizable, NonResizable
  12         }
  13
  14         private static int count = 0;
  15         private int posOnPM;
  16
  17         private PhysicalMachine runningOn;
  18
  19         private HashMap<Integer, Application> applications = new HashMap<Integer, Application>();
  20
  21         private int id;
  22
  23         public static final int initialSize = 100;
  24         public static final int initialRAM = 50;
  25         public static final int initialCPU = 150;
  26
  27         private int reservedSize;
  28         private int reservedRAM;
  29         private int reservedCPU;
  30
  31         private VMType type;
  32
  33         public VirtualMachine(int size, int RAM, int CPU, PhysicalMachine pm, VMType type) {
  34                 id = count;
  35                 count++;
  36                 reservedSize = size + initialSize;
  37                 reservedRAM = RAM + initialRAM;
  38                 reservedCPU = CPU + initialCPU;
  39                 runningOn = pm;
  40                 posOnPM = pm.countCurrentlyRunningVMs();
  41                 this.type = type;
  42         }
  43
  44         public boolean startApplication(Application app) {
  45                 if (enoughResources(app)) {
  46                         applications.put(app.getID(), app);
  47                         app.setRunningOn(this);
  48                         return true;
  49                 } else
  50                         return false;
  51         }
  52
  53         /**
  54          * Set the VM size to the given new values.
  55          *
  56          * @param newSize
  57          *          the new size of the VM, excluding the initial consumption.
  58          * @param newRAM
  59          *          the new RAM of the VM, excluding the initial consumption.
  60          * @param newCPU
  61          *          the new CPU of the VM, excluding the initial consumption.
  62          * @return
  63          */
  64         public boolean resizeVM(int newSize, int newRAM, int newCPU) {
  65                 if (type == VMType.Resizable
  66                                 && runningOn.checkVM(newSize - reservedSize, newRAM - reservedRAM, newCPU - reservedCPU)) {
  67                         // Resize VM
  68                         reservedSize = initialSize + newSize;
  69                         reservedRAM = initialRAM + newRAM;
  70                         reservedCPU = initialCPU + newCPU;
  71                         return true;
  72                 } else
  73                         throw new VMResizeException("Could not resize VM!", this);
  74         }
  75
  76         public boolean stopApplication(Application app) {
  77                 if (applications.containsKey(app.getID())) {
  78                         applications.remove(app.getID());
  79                         app.setRunningOn(null);
  80                         return true;
  81                 } else
  82                         return false;
  83         }
  84
  85         private boolean enoughResources(Application app) {
  86                 return (app.getSize() <= availableSize()) && (app.getRam() <= availableRAM()) && (app.getCpu() <= availableCPU());
  87         }
  88
  89         private int availableSize() {
  90                 return reservedSize - getSize();
  91         }
  92
  93         private int availableRAM() {
  94                 return reservedRAM - getRAM();
  95         }
  96
  97         private int availableCPU() {
  98                 return reservedCPU - getCPU();
  99         }
 100
 101         public int getId() {
 102                 return id;
 103         }
 104
 105         public PhysicalMachine getRunningOn() {
 106                 return runningOn;
 107         }
 108
 109         public int getPositionOnPM() {
 110                 return posOnPM;
 111         }
 112
 113         public ArrayList<Application> getApplications() {
 114                 return new ArrayList<Application>(applications.values());
 115         }
 116
 117         public int getSize() {
 118                 int usedSize = initialSize;
 119                 for (Application a : applications.values())
 120                         usedSize += a.getSize();
 121                 return usedSize;
 122         }
 123
 124         public int getRAM() {
 125                 int usedRAM = initialRAM;
 126                 for (Application a : applications.values())
 127                         usedRAM += a.getRam();
 128                 return usedRAM;
 129         }
 130
 131         public int getCPU() {
 132                 int usedCPU = initialCPU;
 133                 for (Application a : applications.values())
 134                         usedCPU += a.getCpu();
 135                 return usedCPU;
 136         }
 137
 138         public int getReservedSize() {
 139                 return reservedSize;
 140         }
 141
 142         public int getReservedRAM() {
 143                 return reservedRAM;
 144         }
 145
 146         public int getReservedCPU() {
 147                 return reservedCPU;
 148         }
 149
 150         @Override
 151         public String toString() {
 152                 return "VirtualMachine [posOnPM=" + posOnPM + ", runningOn=" + runningOn + ", id=" + id + ", reservedSize="
 153                                 + reservedSize + ", reservedRAM=" + reservedRAM + ", reservedCPU=" + reservedCPU + ", type=" + type + "]";
 154         }
 155
 156 }