diff options
Diffstat (limited to 'framework/src/onos/core/api/src/main/java/org/onosproject/net/newresource/ResourcePath.java')
| -rw-r--r-- | framework/src/onos/core/api/src/main/java/org/onosproject/net/newresource/ResourcePath.java | 168 |
1 files changed, 133 insertions, 35 deletions
diff --git a/framework/src/onos/core/api/src/main/java/org/onosproject/net/newresource/ResourcePath.java b/framework/src/onos/core/api/src/main/java/org/onosproject/net/newresource/ResourcePath.java index 3aa29f6b..d87682a9 100644 --- a/framework/src/onos/core/api/src/main/java/org/onosproject/net/newresource/ResourcePath.java +++ b/framework/src/onos/core/api/src/main/java/org/onosproject/net/newresource/ResourcePath.java @@ -19,12 +19,14 @@ import com.google.common.annotations.Beta; import com.google.common.base.MoreObjects; import com.google.common.collect.ImmutableList; -import java.util.Arrays; +import java.util.LinkedList; import java.util.List; import java.util.Objects; import java.util.Optional; +import static com.google.common.base.Preconditions.checkArgument; import static com.google.common.base.Preconditions.checkNotNull; +import static com.google.common.base.Preconditions.checkState; /** * An object that is used to locate a resource in a network. @@ -32,32 +34,45 @@ import static com.google.common.base.Preconditions.checkNotNull; * of elementary resources that are not globally identifiable. A ResourcePath can be a globally * unique resource identifier. * + * Two types of resource are considered. One is discrete type and the other is continuous type. + * Discrete type resource is a resource whose amount is measured as a discrete unit. VLAN ID and + * MPLS label are examples of discrete type resource. Continuous type resource is a resource whose + * amount is measured as a continuous value. Bandwidth is an example of continuous type resource. + * A double value is associated with a continuous type value. + * * Users of this class must keep the semantics of resources regarding the hierarchical structure. * For example, resource path, Link:1/VLAN ID:100, is valid, but resource path, VLAN ID:100/Link:1 * is not valid because a link is not a sub-component of a VLAN ID. */ @Beta -public final class ResourcePath { +public abstract class ResourcePath { - private final List<Object> resources; + private final Discrete parent; + private final Object last; - public static final ResourcePath ROOT = new ResourcePath(ImmutableList.of()); + public static final Discrete ROOT = new Discrete(); - public static ResourcePath child(ResourcePath parent, Object child) { - ImmutableList<Object> components = ImmutableList.builder() - .addAll(parent.components()) - .add(child) - .build(); - return new ResourcePath(components); + /** + * Creates an resource path which represents a discrete-type resource from the specified components. + * + * @param components components of the path. The order represents hierarchical structure of the resource. + */ + public static ResourcePath discrete(Object... components) { + if (components.length == 0) { + return ROOT; + } else { + return new Discrete(ImmutableList.copyOf(components)); + } } /** - * Creates an resource path from the specified components. + * Creates an resource path which represents a continuous-type resource from the specified components. * + * @param value amount of the resource * @param components components of the path. The order represents hierarchical structure of the resource. */ - public ResourcePath(Object... components) { - this(Arrays.asList(components)); + public static ResourcePath continuous(double value, Object... components) { + return new Continuous(ImmutableList.copyOf(components), value); } /** @@ -65,15 +80,37 @@ public final class ResourcePath { * * @param components components of the path. The order represents hierarchical structure of the resource. */ - public ResourcePath(List<Object> components) { + ResourcePath(List<Object> components) { checkNotNull(components); + checkArgument(!components.isEmpty()); + + LinkedList<Object> children = new LinkedList<>(components); + this.last = children.pollLast(); + if (children.isEmpty()) { + this.parent = ROOT; + } else { + this.parent = new Discrete(children); + } + } - this.resources = ImmutableList.copyOf(components); + /** + * Creates an resource path from the specified parent and child. + * + * @param parent the parent of this resource + * @param last a child of the parent + */ + ResourcePath(Discrete parent, Object last) { + checkNotNull(parent); + checkNotNull(last); + + this.parent = parent; + this.last = last; } // for serialization private ResourcePath() { - this.resources = null; + this.parent = null; + this.last = null; } /** @@ -82,7 +119,15 @@ public final class ResourcePath { * @return the components of this resource path */ public List<Object> components() { - return resources; + LinkedList<Object> components = new LinkedList<>(); + + ResourcePath current = this; + while (current.parent().isPresent()) { + components.addFirst(current.last); + current = current.parent; + } + + return components; } /** @@ -92,21 +137,20 @@ public final class ResourcePath { * @return the parent resource path of this instance. * If there is no parent, empty instance will be returned. */ - public Optional<ResourcePath> parent() { - if (!isRoot()) { - return Optional.of(new ResourcePath(resources.subList(0, resources.size() - 1))); - } + public Optional<Discrete> parent() { + return Optional.ofNullable(parent); + } + + public ResourcePath child(Object child) { + checkState(this instanceof Discrete); - return Optional.empty(); + return new Discrete((Discrete) this, child); } - /** - * Returns true if the path represents root. - * - * @return true if the path represents root, false otherwise. - */ - public boolean isRoot() { - return resources.size() == 0; + public ResourcePath child(Object child, double value) { + checkState(this instanceof Discrete); + + return new Continuous((Discrete) this, child, value); } /** @@ -115,14 +159,13 @@ public final class ResourcePath { * @return the last component of this instance. * The return value is equal to the last object of {@code components()}. */ - public Object lastComponent() { - int last = resources.size() - 1; - return resources.get(last); + public Object last() { + return last; } @Override public int hashCode() { - return resources.hashCode(); + return Objects.hash(this.parent, this.last); } @Override @@ -134,13 +177,68 @@ public final class ResourcePath { return false; } final ResourcePath that = (ResourcePath) obj; - return Objects.equals(this.resources, that.resources); + return Objects.equals(this.parent, that.parent) + && Objects.equals(this.last, that.last); } @Override public String toString() { return MoreObjects.toStringHelper(this) - .add("resources", resources) + .add("parent", parent) + .add("last", last) .toString(); } + + /** + * Represents a resource path which specifies a resource which can be measured + * as a discrete unit. A VLAN ID and a MPLS label of a link are examples of the resource. + * <p> + * Note: This class is exposed to the public, but intended to be used in the resource API + * implementation only. It is not for resource API user. + * </p> + */ + public static final class Discrete extends ResourcePath { + private Discrete() { + super(); + } + + private Discrete(List<Object> components) { + super(components); + } + + private Discrete(Discrete parent, Object last) { + super(parent, last); + } + } + + /** + * Represents a resource path which specifies a resource which can be measured + * as continuous value. Bandwidth of a link is an example of the resource. + * <p> + * Note: This class is exposed to the public, but intended to be used in the resource API + * implementation only. It is not for resource API user. + */ + public static final class Continuous extends ResourcePath { + // Note: value is not taken into account for equality + private final double value; + + private Continuous(List<Object> components, double value) { + super(components); + this.value = value; + } + + public Continuous(Discrete parent, Object last, double value) { + super(parent, last); + this.value = value; + } + + /** + * Returns the value of the resource amount. + * + * @return the value of the resource amount + */ + public double value() { + return value; + } + } } |