Starting point for designing a resource manager API.

+package org.onlab.onos.net.resource;
+
+import java.util.Objects;
+
+/**
+ * Representation of bandwidth resource.
+ */
+public final class Bandwidth extends LinkResource {
+
+    private final double bandwidth;
+
+    /**
+     * Creates a new instance with given bandwidth.
+     *
+     * @param bandwidth bandwidth value to be assigned
+     */
+    private Bandwidth(double bandwidth) {
+        this.bandwidth = bandwidth;
+    }
+
+    /**
+     * Creates a new instance with given bandwidth.
+     *
+     * @param bandwidth bandwidth value to be assigned
+     * @return {@link Bandwidth} instance with given bandwidth
+     */
+    public static Bandwidth valueOf(double bandwidth) {
+        return new Bandwidth(bandwidth);
+    }
+
+    /**
+     * Returns bandwidth as a double value.
+     *
+     * @return bandwidth as a double value
+     */
+    public double toDouble() {
+        return bandwidth;
+    }
+
+    @Override
+    public boolean equals(Object obj) {
+        if (obj instanceof Bandwidth) {
+            Bandwidth that = (Bandwidth) obj;
+            return Objects.equals(this.bandwidth, that.bandwidth);
+        }
+        return false;
+    }
+
+    @Override
+    public int hashCode() {
+        return Objects.hashCode(this.bandwidth);
+    }
+
+    @Override
+    public String toString() {
+        return String.valueOf(this.bandwidth);
+    }
+}

+package org.onlab.onos.net.resource;
+
+import java.util.Objects;
+
+/**
+ * Representation of lambda resource.
+ */
+public final class Lambda extends LinkResource {
+
+    private final int lambda;
+
+    /**
+     * Creates a new instance with given lambda.
+     *
+     * @param lambda lambda value to be assigned
+     */
+    private Lambda(int lambda) {
+        this.lambda = lambda;
+    }
+
+    /**
+     * Creates a new instance with given lambda.
+     *
+     * @param lambda lambda value to be assigned
+     * @return {@link Lambda} instance with given lambda
+     */
+    public static Lambda valueOf(int lambda) {
+        return new Lambda(lambda);
+    }
+
+    /**
+     * Returns lambda as an int value.
+     * @return lambda as an int value
+     */
+    public int toInt() {
+        return lambda;
+    }
+
+    @Override
+    public boolean equals(Object obj) {
+        if (obj instanceof Lambda) {
+            Lambda that = (Lambda) obj;
+            return Objects.equals(this.lambda, that.lambda);
+        }
+        return false;
+    }
+
+    @Override
+    public int hashCode() {
+        return Objects.hashCode(this.lambda);
+    }
+
+    @Override
+    public String toString() {
+        return String.valueOf(this.lambda);
+    }
+
+}

+package org.onlab.onos.net.resource;
+
+/**
+ * Abstraction of link resource.
+ */
+public abstract class LinkResource {
+
+}

+package org.onlab.onos.net.resource;
+
+import java.util.Map;
+
+import org.onlab.onos.net.Link;
+import org.onlab.onos.net.intent.IntentId;
+import org.onlab.onos.net.intent.PathIntent;
+
+/**
+ * Service for providing link resource allocation.
+ */
+public interface LinkResourceService {
+
+    /**
+     * Allocates resources along the path.
+     * <p>
+     * Tries to allocate given resources on the links along the path specified
+     * by the given intent.
+     *
+     * @param res resources to be allocated
+     * @param intent an intent to be used for specifying the path
+     */
+    void allocateResource(LinkResources res, PathIntent intent);
+
+    /**
+     * Releases resources along the path.
+     *
+     * @param intentId an ID for the intent for specifying the path
+     */
+    void releaseResource(IntentId intentId);
+
+    /**
+     * Returns all allocated resources to each link.
+     *
+     * @return allocated resources to each link with {@link IntentId}
+     */
+    Map<Link, Map<IntentId, LinkResources>> allocatedResources();
+
+    /**
+     * Returns all allocated resources to given link.
+     *
+     * @param link a target link
+     * @return allocated resources to the target link with {@link IntentId}
+     */
+    Map<IntentId, LinkResources> allocatedResources(Link link);
+
+    /**
+     * Returns available resources for each link.
+     *
+     * @return available resources for each link
+     */
+    Map<Link, LinkResources> availableResources();
+
+    /**
+     * Returns available resources for given link.
+     * @param link a target link
+     * @return available resources for the target link
+     */
+    LinkResource availableResources(Link link);
+}

+package org.onlab.onos.net.resource;
+
+import java.util.Set;
+
+/**
+ * Abstraction of a resources of a link.
+ */
+public interface LinkResources {
+
+    /**
+     * Returns resources as a set of {@link LinkResource}s.
+     *
+     * @return a set of {@link LinkResource}s
+     */
+    Set<LinkResource> resources();
+
+    /**
+     * Builder of {@link LinkResources}.
+     */
+    public interface Builder {
+
+        /**
+         * Adds bandwidth resource.
+         * <p>
+         * This operation adds given bandwidth to previous bandwidth and
+         * generates single bandwidth resource.
+         *
+         * @param bandwidth bandwidth value to be added
+         * @return self
+         */
+        public Builder addBandwidth(double bandwidth);
+
+        /**
+         * Adds lambda resource.
+         *
+         * @param lambda lambda value to be added
+         * @return self
+         */
+        public Builder addLambda(int lambda);
+
+        /**
+         * Builds an immutable link resources.
+         *
+         * @return link resources
+         */
+        public LinkResources build();
+    }
+}