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36 package gr.grnet.aquarium.computation.data
39 * Maintains the current state of a resource instance owned by the user.
40 * The encoding is as follows:
42 * name: DSLResource.name
43 * instanceId: instance-id (in the resource's descriminatorField)
44 * data: current-resource-value
45 * snapshotTime: last-update-timestamp
47 * In order to have a uniform representation of the resource state for all
48 * resource types (complex or simple) the following convention applies:
50 * - If the resource is complex, the (name, instanceId) is (DSLResource.name, instance-id)
51 * - If the resource is simple, the (name, instanceId) is (DSLResource.name, "1")
53 * @param resource Same as `resource` of [[gr.grnet.aquarium.event.resource.ResourceEventModel]]
54 * @param instanceId Same as `instanceId` of [[gr.grnet.aquarium.event.resource.ResourceEventModel]]
55 * @param instanceAmount This is the amount kept for the resource instance.
56 * The general rule is that an amount saved in a [[gr.grnet.aquarium.computation.data. ResourceInstanceSnapshot]]
57 * represents a total value, while a value appearing in a [[gr.grnet.aquarium.event.resource.ResourceEventModel]]
58 * represents a difference. How these two values are combined to form the new amount is dictated
59 * by the underlying [[gr.grnet.aquarium.logic.accounting.dsl.DSLCostPolicy]]
61 * @author Christos KK Loverdos <loverdos@gmail.com>
63 case class ResourceInstanceSnapshot(resource: String,
65 instanceAmount: Double) {
67 def isSameResourceInstance(resource: String, instanceId: String) = {
68 this.resource == resource &&
69 this.instanceId == instanceId