spacesharedwithfailure.java

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        // Find in EXEC List first
        int found = super.findGridlet(gridletInExecList_, gridletId, userId);
        if (found >= 0)
        {
            // updates all the Gridlets first before pausing
            updateGridletProcessing();

            // Removes the Gridlet from the execution list
            ResGridlet rgl = (ResGridlet) gridletInExecList_.remove(found);

            // if a Gridlet is finished upon cancelling, then set it to success
            // instead.
            if (rgl.getRemainingGridletLength() == 0.0)
            {
                found = -1;  // meaning not found in Queue List
                gridletFinish(rgl, Gridlet.SUCCESS);
                System.out.println(super.resName_
                        + ".SpaceSharedWithFailure.gridletPause(): Cannot pause"
                        + " Gridlet #" + gridletId + " for User #" + userId
                        + " since it has FINISHED.");
            }
            else
            {
                status = true;
                rgl.setGridletStatus(Gridlet.PAUSED);  // change the status
                gridletPausedList_.add(rgl);   // add into the paused list

                // Set the PE on which Gridlet finished to FREE
                super.resource_.setStatusPE( PE.FREE, rgl.getMachineID(),
                                             rgl.getPEID() );

                // empty slot is available, hence process a new Gridlet
                allocateQueueGridlet();
            }
        }
        else {      // Find in QUEUE list
            found = super.findGridlet(gridletQueueList_, gridletId, userId);
        }

        // if found in the Queue List
        if (status == false && found >= 0)
        {
            status = true;

            // removes the Gridlet from the Queue list
            ResGridlet rgl = (ResGridlet) gridletQueueList_.remove(found);
            rgl.setGridletStatus(Gridlet.PAUSED);   // change the status
            gridletPausedList_.add(rgl);            // add into the paused list
        }
        // if not found anywhere in both exec and paused lists
        else if (found == -1)
        {
            System.out.println(super.resName_ +
                    ".SpaceSharedWithFailure.gridletPause(): Error - cannot " +
                    "find Gridlet #" + gridletId + " for User #" + userId);
        }

        // sends back an ack if required
        if (ack == true)
        {
            super.sendAck(GridSimTags.GRIDLET_PAUSE_ACK, status,
                          gridletId, userId);
        }
    }

    /**
     * Moves a Gridlet from this GridResource entity to a different one.
     * This method will search in both the execution and paused list.
     * The User ID is important as many Users might have the same Gridlet ID
     * in the lists.
     * <p>
     * If a Gridlet has finished beforehand, then this method will send back
     * the Gridlet to sender, i.e. the <tt>userId</tt> and sets the
     * acknowledgment to false (if required).
     *
     * @param gridletId    a Gridlet ID
     * @param userId       the user or owner's ID of this Gridlet
     * @param destId       a new destination GridResource ID for this Gridlet
     * @param   ack   an acknowledgement, i.e. <tt>true</tt> if wanted to know
     *        whether this operation is success or not, <tt>false</tt>
     *        otherwise (don't care)
     * @pre gridletId > 0
     * @pre userId > 0
     * @pre destId > 0
     * @post $none
     */
    public void gridletMove(int gridletId, int userId, int destId, boolean ack)
    {
        // cancels the Gridlet
        ResGridlet rgl = cancel(gridletId, userId);

        // if the Gridlet is not found
        if (rgl == null)
        {
            System.out.println(super.resName_ +
                       ".SpaceSharedWithFailure.gridletMove(): Cannot find " +
                       "Gridlet #" + gridletId + " for User #" + userId);

            if (ack == true)   // sends back an ack if required
            {
                super.sendAck(GridSimTags.GRIDLET_SUBMIT_ACK, false,
                              gridletId, userId);
            }

            return;
        }

        // if the Gridlet has finished beforehand
        if (rgl.getGridletStatus() == Gridlet.SUCCESS)
        {
            System.out.println(super.resName_
                + ".SpaceSharedWithFailure.gridletMove(): Cannot move Gridlet #"
                + gridletId + " for User #"+ userId+ " since it has FINISHED.");

            if (ack == true) // sends back an ack if required
            {
                super.sendAck(GridSimTags.GRIDLET_SUBMIT_ACK, false,
                              gridletId, userId);
            }

            gridletFinish(rgl, Gridlet.SUCCESS);
        }
        else   // otherwise moves this Gridlet to a different GridResource
        {
            rgl.finalizeGridlet();

            // Set PE on which Gridlet finished to FREE
            super.resource_.setStatusPE( PE.FREE, rgl.getMachineID(),
                                         rgl.getPEID() );

            super.gridletMigrate(rgl.getGridlet(), destId, ack);
            allocateQueueGridlet();
        }
    }

    /**
     * Resumes a Gridlet only in the paused list.
     * The User ID is important as many Users might have the same Gridlet ID
     * in the lists.
     * @param gridletId    a Gridlet ID
     * @param userId       the user or owner's ID of this Gridlet
     * @param   ack   an acknowledgement, i.e. <tt>true</tt> if wanted to know
     *        whether this operation is success or not, <tt>false</tt>
     *        otherwise (don't care)
     * @pre gridletId > 0
     * @pre userId > 0
     * @post $none
     */
    public void gridletResume(int gridletId, int userId, boolean ack)
    {
        boolean status = false;

        // finds the Gridlet in the execution list first
        int found = super.findGridlet(gridletPausedList_, gridletId, userId);
        if (found >= 0)
        {
            // removes the Gridlet
            ResGridlet rgl = (ResGridlet) gridletPausedList_.remove(found);
            rgl.setGridletStatus(Gridlet.RESUMED);

            // update the Gridlets up to this point in time
            updateGridletProcessing();
            status = true;

            // if there is an available PE slot, then allocate immediately
            boolean success = false;
            if ( gridletInExecList_.size() < super.totalPE_ ) {
                success = allocatePEtoGridlet(rgl);
            }

            // otherwise put into Queue list
            if (success == false)
            {
                rgl.setGridletStatus(Gridlet.QUEUED);
                gridletQueueList_.add(rgl);
            }

            System.out.println(super.resName_ + "TimeShared.gridletResume():" +
                    " Gridlet #" + gridletId + " with User ID #" +
                    userId + " has been sucessfully RESUMED.");
        }
        else
        {
            System.out.println(super.resName_ +
                    "TimeShared.gridletResume(): Cannot find " +
                    "Gridlet #" + gridletId + " for User #" + userId);
        }

        // sends back an ack if required
        if (ack == true)
        {
            super.sendAck(GridSimTags.GRIDLET_RESUME_ACK, status,
                          gridletId, userId);
        }
    }

    ///////////////////////////// PRIVATE METHODS /////////////////////

    /**
     * Allocates the first Gridlet in the Queue list (if any) to execution list
     * @pre $none
     * @post $none
     */
    private void allocateQueueGridlet()
    {
        // if there are many Gridlets in the QUEUE, then allocate a
        // PE to the first Gridlet in the list since it follows FCFS
        // (First Come First Serve) approach. Then removes the Gridlet from
        // the Queue list
        if (gridletQueueList_.size() > 0 &&
            gridletInExecList_.size() < super.totalPE_)
        {
            ResGridlet obj = (ResGridlet) gridletQueueList_.get(0);

            // allocate the Gridlet into an empty PE slot and remove it from
            // the queue list
            boolean success = allocatePEtoGridlet(obj);
            if (success == true) {
                gridletQueueList_.remove(obj);
            }
        }
    }

    /**
     * Updates the execution of all Gridlets for a period of time.
     * The time period is determined from the last update time up to the
     * current time. Once this operation is successfull, then the last update
     * time refers to the current time.
     * @pre $none
     * @post $none
     */
    private void updateGridletProcessing()
    {
        // Identify MI share for the duration (from last event time)
        double time = GridSim.clock();
        double timeSpan = time - lastUpdateTime_;

        // if current time is the same or less than the last update time,
        // then ignore
        if (timeSpan <= 0.0) {
            return;
        }

        // Update Current Time as Last Update
        lastUpdateTime_ = time;

        // update the GridResource load
        int size = gridletInExecList_.size();
        double load = super.calculateTotalLoad(size);
        super.addTotalLoad(load);

        // if no Gridlets in execution then ignore the rest
        if (size == 0) {
            return;
        }

        ResGridlet obj = null;

        // a loop that allocates MI share for each Gridlet accordingly
        Iterator iter = gridletInExecList_.iterator();
        while ( iter.hasNext() )
        {
            obj = (ResGridlet) iter.next();

            // Updates the Gridlet length that is currently being executed
            load = getMIShare( timeSpan, obj.getMachineID() );
            obj.updateGridletFinishedSoFar(load);
        }
    }

    /**
     * Identifies MI share (max and min) each Gridlet gets for
     * a given timeSpan
     * @param timeSpan     duration
     * @param machineId    machine ID that executes this Gridlet
     * @return  the total MI share that a Gridlet gets for a given
     *          <tt>timeSpan</tt>
     * @pre timeSpan >= 0.0
     * @pre machineId > 0
     * @post $result >= 0.0
     */
    private double getMIShare(double timeSpan, int machineId)
    {
        // 1 - localLoad_ = available MI share percentage
        double localLoad = super.resCalendar_.getCurrentLoad();

        // each Machine might have different PE Rating compare to another
        // so much look at which Machine this PE belongs to
        double totalMI = machineRating_[machineId] * timeSpan * (1 - localLoad);
        return totalMI;
    }

    /**
     * Allocates a Gridlet into a free PE and sets the Gridlet status into
     * INEXEC and PE status into busy afterwards
     * @param rgl  a ResGridlet object
     * @return <tt>true</tt> if there is an empty PE to process this Gridlet,
     *         <tt>false</tt> otherwise
     * @pre rgl != null
     * @post $none
     */
    private boolean allocatePEtoGridlet(ResGridlet rgl)
    {