cpumonitor.java

First of all, the Applet-phone is a SIP User-Agent with audio and text messaging capabilities. But

/*
 * CPUMonitor.java
 *
 * Created on October 7, 2003, 8:02 AM
 */

package gov.nist.security.bcs.monitor;

/**
 * Class monitoring the CPU resources allocated for a service
 * @author  DERUELLE Jean
 */
public class CPUMonitor {
    /**Free Memory at the starting of the service*/    
    private long beforeInitMem=0;
    /**Free Memory after an allocation in the service*/
    private long afterInitMem=0;
    /**Total allocated memory*/
    private long allocatedMemory=0;  
    /**the access control context of the jvm with wich we will check the allocation permission*/
    private java.security.AccessControlContext context=null;
    
    /** Creates a new instance of CPUMonitor */
    public CPUMonitor() {
        SecurityManager securityManager=System.getSecurityManager();
        if (securityManager != null) 
            context = (java.security.AccessControlContext) securityManager.getSecurityContext();                      
        //System.gc();
        beforeInitMem = Runtime.getRuntime().freeMemory();              
    }        
    
    /**
     * Check the memory after an allocation
     */
    public void checkMemoryAfter(){
        //System.gc();
        afterInitMem = Runtime.getRuntime().freeMemory();        
        allocatedMemory=beforeInitMem-afterInitMem;
        
        //System.out.println("AfterNew " + afterInitMem);
        //System.out.println("memory Consumed " + allocatedMemory);        
        try{
            gov.nist.security.permissions.AllocationPermission allocationPermission=
                new gov.nist.security.permissions.AllocationPermission(
                    Long.toString(allocatedMemory),"allocation");
            //System.out.println("Checking in your group policy file for the following CPU RESOURCE PERMISSION : "+ allocationPermission);
            context.checkPermission(allocationPermission);             
        }
        catch(Exception e){
            System.out.println("Too much memory allocated : "+allocatedMemory);
            System.out.println("The service is exited ");
            System.exit(1);
        }
    }
   
}