Bugfixes.

modules/cloudsim/src/main/java/org/cloudbus/cloudsim/CloudletSchedulerSpaceShared.java

@@ -145,7 +145,6 @@ public class CloudletSchedulerSpaceShared extends CloudletScheduler {
 				nextEvent = estimatedFinishTime;
 			}
 		}
-
 		setPreviousTime(currentTime);
 		return nextEvent;
 	}
@@ -187,7 +186,7 @@ public class CloudletSchedulerSpaceShared extends CloudletScheduler {
 		for (ResCloudlet rcl : getCloudletPausedList()) {
 			if (rcl.getCloudletId() == cloudletId) {
 				getCloudletPausedList().remove(rcl);
-				rcl.getCloudlet();
+				return rcl.getCloudlet();
 			}
 		}
 
@@ -383,7 +382,6 @@ public class CloudletSchedulerSpaceShared extends CloudletScheduler {
 		} else {// no enough free PEs: go to the waiting queue
 			ResCloudlet rcl = new ResCloudlet(cloudlet);
 			rcl.setCloudletStatus(Cloudlet.QUEUED);
-
 			getCloudletWaitingList().add(rcl);
 			return 0.0;
 		}
@@ -407,7 +405,6 @@ public class CloudletSchedulerSpaceShared extends CloudletScheduler {
 		long length = cloudlet.getCloudletLength();
 		length += extraSize;
 		cloudlet.setCloudletLength(length);
-
 		return cloudlet.getCloudletLength() / capacity;
 	}
 

modules/cloudsim/src/main/java/org/cloudbus/cloudsim/Datacenter.java

@@ -93,6 +93,10 @@ public class Datacenter extends SimEntity {
 		setStorageList(storageList);
 		setVmList(new ArrayList<Vm>());
 		setSchedulingInterval(schedulingInterval);
+		
+		for (Host host: getCharacteristics().getHostList()) {
+			host.setDatacenter(this);
+		}
 
         // If this resource doesn't have any PEs then no useful at all
         if (getCharacteristics().getPesNumber() == 0) {

modules/cloudsim/src/main/java/org/cloudbus/cloudsim/FederatedDatacenter.java

@@ -100,7 +100,7 @@ public class FederatedDatacenter extends SimEntity {
 		setDebts(new HashMap<Integer,Double>());
 		setStorageList(storageList);
 		setVmList(new ArrayList<Vm>());
-
+		
         // If this resource doesn't have any PEs then no useful at all
         if (getCharacteristics().getPesNumber() == 0) {
             throw new Exception(super.getName() + " : Error - this entity has no PEs. Therefore, can't process any Cloudlets.");

modules/cloudsim/src/main/java/org/cloudbus/cloudsim/Host.java

@@ -56,6 +56,9 @@ public class Host {
 
 	/** The vms migrating in. */
 	private List<Vm> vmsMigratingIn;
+	
+	/** THe datacenter where the host is placed */
+	private Datacenter datacenter;
 
 	/**
 	 * Instantiates a new host.
@@ -582,5 +585,22 @@ public class Host {
 	protected void setVmsMigratingIn(List<Vm> vmsMigratingIn) {
 		this.vmsMigratingIn = vmsMigratingIn;
 	}
+	
+	/**
+	 * Gets the data center.
+	 * @return the data center where the host runs
+	 */
+	public Datacenter getDatacenter(){
+		return this.datacenter;
+	}
+	
+	/**
+	 * Sets the data center.
+	 *
+	 * @param datacenter the data center from this host
+	 */
+	public void setDatacenter(Datacenter datacenter) {
+		this.datacenter = datacenter;
+	}
 
 }

modules/cloudsim/src/main/java/org/cloudbus/cloudsim/ResCloudlet.java

@@ -346,6 +346,7 @@ public class ResCloudlet {
                 startExecTime = clock;
                 cloudlet.setExecStartTime(startExecTime);
             }
+            
         }
         catch(Exception e) {
             success = false;

modules/cloudsim/src/main/java/org/cloudbus/cloudsim/core/CloudSim.java

@@ -543,6 +543,24 @@ public class CloudSim {
 		SimEvent e = new SimEvent(SimEvent.SEND, clock + delay, src, dest, tag, data);
 		future.addEvent(e);
 	}
+	
+	/**
+	 * Used to send an event from one entity to another, with priority in the queue.
+	 *
+	 * @param src the src
+	 * @param dest the dest
+	 * @param delay the delay
+	 * @param tag the tag
+	 * @param data the data
+	 */
+	public static void sendFirst(int src, int dest, double delay, int tag, Object data) {
+		if (delay < 0) {
+			throw new IllegalArgumentException("Send delay can't be negative.");
+		}
+
+		SimEvent e = new SimEvent(SimEvent.SEND, clock + delay, src, dest, tag, data);
+		future.addEventFirst(e);
+	}
 
 	/**
 	 * Sets an entity's state to be waiting. The predicate used to wait for an event

modules/cloudsim/src/main/java/org/cloudbus/cloudsim/core/FutureQueue.java

@@ -41,6 +41,16 @@ public class FutureQueue {
 		newEvent.setSerial(serial++);
 		sortedSet.add(newEvent);
 	}
+	
+	/**
+	 * Add a new event to the head of the queue. 
+	 *
+	 * @param newEvent The event to be put in the queue.
+	 */
+	public void addEventFirst(SimEvent newEvent) {
+		newEvent.setSerial(0);
+		sortedSet.add(newEvent);
+	}
 
 	/**
 	 * Returns an iterator to the queue.

modules/cloudsim/src/main/java/org/cloudbus/cloudsim/core/SimEntity.java

@@ -183,6 +183,109 @@ public abstract class SimEntity implements Cloneable {
 	public void scheduleNow(String dest, int tag) {
 		schedule(dest, 0, tag, null);
 	}
+	
+	/**
+	 * Send a high priority event to another entity by id number, with data. Note that the
+	 * tag <code>9999</code> is reserved.
+	 *
+	 * @param dest The unique id number of the destination entity
+	 * @param delay How long from the current simulation time the event
+	 * should be sent
+	 * @param tag An user-defined number representing the type of event.
+	 * @param data The data to be sent with the event.
+	 */
+	public void scheduleFirst(int dest, double delay, int tag, Object data) {
+		if (!CloudSim.running()) {
+			return;
+		}
+		CloudSim.sendFirst(id, dest, delay, tag, data);
+	}
+
+	/**
+	 * Send a high priority event to another entity by id number and with <b>no</b> data.
+	 * Note that the tag <code>9999</code> is reserved.
+	 *
+	 * @param dest The unique id number of the destination entity
+	 * @param delay How long from the current simulation time the event
+	 * should be sent
+	 * @param tag An user-defined number representing the type of event.
+	 */
+	public void scheduleFirst(int dest, double delay, int tag) {
+		scheduleFirst(dest, delay, tag, null);
+	}
+
+	/**
+	 * Send a high priority event to another entity through a port with a given name, with
+	 * data. Note that the tag <code>9999</code> is reserved.
+	 *
+	 * @param dest The name of the port to send the event through
+	 * @param delay How long from the current simulation time the event
+	 * should be sent
+	 * @param tag An user-defined number representing the type of event.
+	 * @param data The data to be sent with the event.
+	 */
+	public void scheduleFirst(String dest, double delay, int tag, Object data) {
+		scheduleFirst(CloudSim.getEntityId(dest), delay, tag, data);
+	}
+
+	/**
+	 * Send a high priority event to another entity through a port with a given name, with
+	 * <b>no</b> data. Note that the tag <code>9999</code> is reserved.
+	 *
+	 * @param dest The name of the port to send the event through
+	 * @param delay How long from the current simulation time the event should be
+	 * sent
+	 * @param tag An user-defined number representing the type of event.
+	 */
+	public void scheduleFirst(String dest, double delay, int tag) {
+		scheduleFirst(dest, delay, tag, null);
+	}
+
+	/**
+	 * Send a high priority event to another entity by id number, with data. Note that the
+	 * tag <code>9999</code> is reserved.
+	 *
+	 * @param dest The unique id number of the destination entity
+	 * @param tag An user-defined number representing the type of event.
+	 * @param data The data to be sent with the event.
+	 */
+	public void scheduleFirstNow(int dest, int tag, Object data) {
+		scheduleFirst(dest, 0, tag, data);
+	}
+
+	/**
+	 * Send a high priority event to another entity by id number and with <b>no</b> data.
+	 * Note that the tag <code>9999</code> is reserved.
+	 *
+	 * @param dest The unique id number of the destination entity
+	 * @param tag An user-defined number representing the type of event.
+	 */
+	public void scheduleFirstNow(int dest, int tag) {
+		scheduleFirst(dest, 0, tag, null);
+	}
+
+	/**
+	 * Send a high priority event to another entity through a port with a given name, with
+	 * data. Note that the tag <code>9999</code> is reserved.
+	 *
+	 * @param dest The name of the port to send the event through
+	 * @param tag An user-defined number representing the type of event.
+	 * @param data The data to be sent with the event.
+	 */
+	public void scheduleFirstNow(String dest, int tag, Object data) {
+		scheduleFirst(CloudSim.getEntityId(dest), 0, tag, data);
+	}
+
+	/**
+	 * Send a high priority event to another entity through a port with a given name, with
+	 * <b>no</b> data. Note that the tag <code>9999</code> is reserved.
+	 *
+	 * @param dest The name of the port to send the event through
+	 * @param tag An user-defined number representing the type of event.
+	 */
+	public void scheduleFirstNow(String dest, int tag) {
+		scheduleFirst(dest, 0, tag, null);
+	}
 
 	/**
 	 * Set the entity to be inactive for a time period.