diff --git a/core/api/src/main/java/org/onlab/onos/net/resource/BandwidthResourceAllocation.java b/core/api/src/main/java/org/onlab/onos/net/resource/BandwidthResourceAllocation.java
index b542533..77db287 100644
--- a/core/api/src/main/java/org/onlab/onos/net/resource/BandwidthResourceAllocation.java
+++ b/core/api/src/main/java/org/onlab/onos/net/resource/BandwidthResourceAllocation.java
@@ -3,6 +3,14 @@
 /**
  * Representation of allocated bandwidth resource.
  */
-public interface BandwidthResourceAllocation extends BandwidthResourceRequest {
-
+public class BandwidthResourceAllocation extends BandwidthResourceRequest {
+    /**
+     * Creates a new {@link BandwidthResourceAllocation} with {@link Bandwidth}
+     * object.
+     *
+     * @param bandwidth allocated bandwidth
+     */
+    public BandwidthResourceAllocation(Bandwidth bandwidth) {
+        super(bandwidth);
+    }
 }
diff --git a/core/api/src/main/java/org/onlab/onos/net/resource/BandwidthResourceRequest.java b/core/api/src/main/java/org/onlab/onos/net/resource/BandwidthResourceRequest.java
index c958271..7251ea1 100644
--- a/core/api/src/main/java/org/onlab/onos/net/resource/BandwidthResourceRequest.java
+++ b/core/api/src/main/java/org/onlab/onos/net/resource/BandwidthResourceRequest.java
@@ -3,7 +3,7 @@
 /**
  * Representation of a request for bandwidth resource.
  */
-public final class BandwidthResourceRequest implements ResourceRequest {
+public class BandwidthResourceRequest implements ResourceRequest {
     private final Bandwidth bandwidth;
 
     /**
diff --git a/core/api/src/main/java/org/onlab/onos/net/resource/LambdaResourceAllocation.java b/core/api/src/main/java/org/onlab/onos/net/resource/LambdaResourceAllocation.java
index 1ed63b4..a8686ea 100644
--- a/core/api/src/main/java/org/onlab/onos/net/resource/LambdaResourceAllocation.java
+++ b/core/api/src/main/java/org/onlab/onos/net/resource/LambdaResourceAllocation.java
@@ -3,11 +3,25 @@
 /**
  * Representation of allocated lambda resource.
  */
-public interface LambdaResourceAllocation extends LambdaResourceRequest {
+public class LambdaResourceAllocation extends LambdaResourceRequest {
+    private final Lambda lambda;
+
+    /**
+     * Creates a new {@link LambdaResourceAllocation} with {@link Lambda}
+     * object.
+     *
+     * @param lambda allocated lambda
+     */
+    public LambdaResourceAllocation(Lambda lambda) {
+        this.lambda = lambda;
+    }
+
     /**
      * Returns the lambda resource.
      *
      * @return the lambda resource
      */
-    Lambda lambda();
+    Lambda lambda() {
+        return lambda;
+    }
 }
diff --git a/core/api/src/main/java/org/onlab/onos/net/resource/LinkResourceAllocations.java b/core/api/src/main/java/org/onlab/onos/net/resource/LinkResourceAllocations.java
index a3d3e87..3dce62f 100644
--- a/core/api/src/main/java/org/onlab/onos/net/resource/LinkResourceAllocations.java
+++ b/core/api/src/main/java/org/onlab/onos/net/resource/LinkResourceAllocations.java
@@ -5,7 +5,7 @@
 /**
  * Representation of allocated link resources.
  */
-public interface LinkResourceAllocations extends LinkResourceRequest {
+public interface LinkResourceAllocations {
     /**
      * Returns allocated resource for the given link.
      *