-/* JNI interface to virtual machine in Simgrid */
+/* Java bindings of the s4u::VirtualMachine */
-/* Copyright (c) 2006-2014. The SimGrid Team.
- * All rights reserved. */
+/* Copyright (c) 2006-2017. The SimGrid Team. All rights reserved. */
/* This program is free software; you can redistribute it and/or modify it
* under the terms of the license (GNU LGPL) which comes with this package. */
package org.simgrid.msg;
-import java.util.ArrayList;
-public class VM extends Host{
- // Please note that we are not declaring a new bind variable
- //(the bind variable has been inherited from the super class Host)
+public class VM extends Host {
+ // No need to declare a new bind variable: we use the one inherited from the super class Host
- /* Static functions */
- // GetByName is inherited from the super class Host
-
-
- private static ArrayList<VM> vms= new ArrayList<>();
private Host currentHost;
+ private int coreAmount = 1;
- /* Constructors / destructors */
- /**
- * Create a `basic' VM (i.e. 1 core, 1GB of RAM, other values are not taken into account).
- */
+ /** Create a `basic' VM (i.e. 1GB of RAM, other values are not taken into account). */
public VM(Host host, String name) {
- this(host,name,1,1024, -1, null, -1,0 , 0);
+ this(host,name, /*coreAmount*/1, 1024, 0, 0);
+ }
+
+ public VM(Host host, String name, int coreAmount) {
+ this(host,name, coreAmount, 1024, 0, 0);
+ }
+ public VM(Host host, String name, int ramSize, int migNetSpeed, int dpIntensity){
+ this(host, name, /*coreAmount*/1, ramSize, migNetSpeed, dpIntensity);
}
/**
- * Create a VM
- * @param host Host node
+ * Create a VM
+ * @param host Host node
* @param name name of the machine
- * @param nCore number of core
* @param ramSize size of the RAM that should be allocated (in MBytes)
- * @param netCap (not used for the moment)
- * @param diskPath (not used for the moment)
- * @param diskSize (not used for the moment)
* @param migNetSpeed (network bandwith allocated for migrations in MB/s, if you don't know put zero ;))
* @param dpIntensity (dirty page percentage according to migNetSpeed, [0-100], if you don't know put zero ;))
*/
- public VM(Host host, String name, int nCore, int ramSize,
- int netCap, String diskPath, int diskSize, int migNetSpeed, int dpIntensity){
+ public VM(Host host, String name, int coreAmount, int ramSize, int migNetSpeed, int dpIntensity){
super();
- super.name = name;
+ super.name = name;
this.currentHost = host;
- create(host, name, nCore, ramSize, netCap, diskPath, diskSize, migNetSpeed, dpIntensity);
- vms.add(this);
+ this.coreAmount = coreAmount;
+ create(host, name, coreAmount, ramSize, migNetSpeed, dpIntensity);
}
- public static VM[] all(){
- VM[] allvms = new VM[vms.size()];
- vms.toArray(allvms);
- return allvms;
- }
+ /** Retrieve the list of all existing VMs */
+ public static native VM[] all();
- public static VM getVMByName(String name){
- for (VM vm : vms){
- if (vm.getName().equals(name))
- return vm;
- }
- return null;
- }
+ /** Retrieve a VM from its name */
+ public static native VM getVMByName(String name);
+ /** Shutdown and unref the VM.
+ *
+ * Actually, this strictly equivalent to shutdown().
+ * In C and in libvirt, the destroy function also releases the memory associated to the VM,
+ * but this is not the way it goes in Java. The VM will only get destroyed by the garbage
+ * collector when it is not referenced anymore by your variables. So, to see the VM really
+ * destroyed, don't call this function but simply release any ref you have on it.
+ */
public void destroy() {
- try {
- nativeFinalize();
- } catch (Exception e) {
- e.printStackTrace();
- }
+ shutdown();
}
- private native void nativeFinalize();
-
- /* JNI / Native code */
-
- /* get/set property methods are inherited from the Host class. */
+ /* Make sure that the GC also destroys the C object */
+ protected void finalize() throws Throwable {
+ nativeFinalize();
+ }
+ private native void nativeFinalize();
- /** Returns whether the given VM is currently suspended
- */
+ /** Returns whether the given VM is currently suspended */
public native int isCreated();
- /** Returns whether the given VM is currently running
- */
+ /** Returns whether the given VM is currently running */
public native int isRunning();
- /** Returns whether the given VM is currently running
- */
+ /** Returns whether the given VM is currently running */
public native int isMigrating();
- /** Returns whether the given VM is currently suspended
- */
+ /** Returns whether the given VM is currently suspended */
public native int isSuspended();
- /** Returns whether the given VM is currently saving
- */
- public native int isSaving();
-
- /** Returns whether the given VM is currently saved
- */
- public native int isSaved();
-
- /** Returns whether the given VM is currently restoring its state
- */
- public native boolean isRestoring();
-
+ /** Returns the amount of virtual CPUs provided */
+ public int getCoreAmount() {
+ return coreAmount;
+ }
+
/**
* Natively implemented method create the VM.
- * @param nCore number of core
* @param ramSize size of the RAM that should be allocated (in MB)
- * @param netCap (not used for the moment)
- * @param diskPath (not used for the moment)
- * @param diskSize (not used for the moment)
* @param migNetSpeed (network bandwith allocated for migrations in MB/s, if you don't know put zero ;))
* @param dpIntensity (dirty page intensity, a percentage of migNetSpeed [0-100], if you don't know put zero ;))
*/
- private native void create(Host host, String name, int nCore, int ramSize,
- int netCap, String diskPath, int diskSize, int migNetSpeed, int dpIntensity);
+ private native void create(Host host, String name, int coreAmount, int ramSize, int migNetSpeed, int dpIntensity);
/**
*/
public native void setBound(double bound);
- /**
- * start the VM
- */
+ /** start the VM */
public native void start();
/**
- * Immediately kills all processes within the given VM. Any memory that they allocated will be leaked.
- * No extra delay occurs. If you want to simulate this too, you want to use a MSG_process_sleep() or something
+ * Immediately kills all processes within the given VM.
+ *
+ * No extra delay occurs. If you want to simulate this too, you want to use a MSG_process_sleep()
*/
public native void shutdown();
- /**
- * Invoke native migration routine
- */
- public native void internalmig(Host destination) throws Exception; // TODO add throws DoubleMigrationException (i.e. when you call migrate on a VM that is already migrating);
-
-
-
/** Change the host on which all processes are running
* (pre-copy is implemented)
*/
public void migrate(Host destination) throws HostFailureException{
try {
- this.internalmig(destination);
+ this.nativeMigration(destination);
} catch (Exception e){
Msg.info("Migration of VM "+this.getName()+" to "+destination.getName()+" is impossible ("+e.getMessage()+")");
throw new HostFailureException();
// If the migration correcly returned, then we should change the currentHost value.
this.currentHost = destination;
}
+ private native void nativeMigration(Host destination) throws MsgException;
/** Immediately suspend the execution of all processes within the given VM
*
*/
public native void resume();
- /** Immediately suspend the execution of all processes within the given VM
- * and save its state on the persistent HDD
- * Not yet implemented (for the moment it behaves like suspend)
- * No suspension cost occurs. If you want to simulate this too, you want to
- * use a \ref File.write() before or after, depending on the exact semantic
- * of VM suspend to you.
- */
- public native void save();
-
- /** Immediately resumes the execution of all processes previously saved
- * within the given VM
- * Not yet implemented (for the moment it behaves like resume)
- *
- * No resume cost occurs. If you want to simulate this too, you want to
- * use a \ref File.read() before or after, depending on the exact semantic
- * of VM resume to you.
- */
- public native void restore();
-
-
- /**
- * Class initializer, to initialize various JNI stuff
- */
- public static native void nativeInit();
+ /** Class initializer (for JNI), don't do it yourself */
+ private static native void nativeInit();
static {
nativeInit();
}