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2021-04-06 00:45:28 +02:00
commit 17fabc368e
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--- a/src/org/cloudbus/cloudsim/provisioners/RamProvisioner.java
+++ b/src/org/cloudbus/cloudsim/provisioners/RamProvisioner.java
@@ -0,0 +1,146 @@
+/*
+ * Title:        CloudSim Toolkit
+ * Description:  CloudSim (Cloud Simulation) Toolkit for Modeling and Simulation of Clouds
+ * Licence:      GPL - http://www.gnu.org/copyleft/gpl.html
+ *
+ * Copyright (c) 2009-2012, The University of Melbourne, Australia
+ */
+
+package org.cloudbus.cloudsim.provisioners;
+
+import org.cloudbus.cloudsim.Vm;
+
+/**
+ * RamProvisioner is an abstract class that represents the provisioning policy of memory to virtual
+ * machines inside a Host. When extending this class, care must be taken to guarantee that the field
+ * availableMemory will always contain the amount of free memory available for future allocations.
+ * 
+ * @author Rodrigo N. Calheiros
+ * @author Anton Beloglazov
+ * @since CloudSim Toolkit 1.0
+ */
+public abstract class RamProvisioner {
+
+	/** The ram. */
+	private int ram;
+
+	/** The available ram. */
+	private int availableRam;
+
+	/**
+	 * Creates the new RamProvisioner.
+	 * 
+	 * @param ram the ram
+	 * 
+	 * @pre ram>=0
+	 * @post $none
+	 */
+	public RamProvisioner(int ram) {
+		setRam(ram);
+		setAvailableRam(ram);
+	}
+
+	/**
+	 * Allocates RAM for a given VM.
+	 * 
+	 * @param vm virtual machine for which the RAM are being allocated
+	 * @param ram the RAM
+	 * 
+	 * @return $true if the RAM could be allocated; $false otherwise
+	 * 
+	 * @pre $none
+	 * @post $none
+	 */
+	public abstract boolean allocateRamForVm(Vm vm, int ram);
+
+	/**
+	 * Gets the allocated RAM for VM.
+	 * 
+	 * @param vm the VM
+	 * 
+	 * @return the allocated RAM for vm
+	 */
+	public abstract int getAllocatedRamForVm(Vm vm);
+
+	/**
+	 * Releases BW used by a VM.
+	 * 
+	 * @param vm the vm
+	 * 
+	 * @pre $none
+	 * @post none
+	 */
+	public abstract void deallocateRamForVm(Vm vm);
+
+	/**
+	 * Releases BW used by a all VMs.
+	 * 
+	 * @pre $none
+	 * @post none
+	 */
+	public void deallocateRamForAllVms() {
+		setAvailableRam(getRam());
+	}
+
+	/**
+	 * Checks if is suitable for vm.
+	 * 
+	 * @param vm the vm
+	 * @param ram the ram
+	 * 
+	 * @return true, if is suitable for vm
+	 */
+	public abstract boolean isSuitableForVm(Vm vm, int ram);
+
+	/**
+	 * Gets the ram.
+	 * 
+	 * @return the ram
+	 */
+	public int getRam() {
+		return ram;
+	}
+
+	/**
+	 * Sets the ram.
+	 * 
+	 * @param ram the ram to set
+	 */
+	protected void setRam(int ram) {
+		this.ram = ram;
+	}
+
+	/**
+	 * Gets the amount of used RAM in the host.
+	 * 
+	 * @return used ram
+	 * 
+	 * @pre $none
+	 * @post $none
+	 */
+	public int getUsedRam() {
+		return ram - availableRam;
+	}
+
+	/**
+	 * Gets the available RAM in the host.
+	 * 
+	 * @return available ram
+	 * 
+	 * @pre $none
+	 * @post $none
+	 */
+	public int getAvailableRam() {
+		return availableRam;
+	}
+
+	/**
+	 * Sets the available ram.
+	 * 
+	 * @param availableRam the availableRam to set
+	 */
+	protected void setAvailableRam(int availableRam) {
+		this.availableRam = availableRam;
+	}
+
+}