Restructured to separate stores and managers into different bundles. Reactive forwarding does not seem to work; will investigate.
diff --git a/core/api/src/main/java/org/onlab/onos/net/topology/DefaultTopologyEdge.java b/core/api/src/main/java/org/onlab/onos/net/topology/DefaultTopologyEdge.java
new file mode 100644
index 0000000..00eb3d2
--- /dev/null
+++ b/core/api/src/main/java/org/onlab/onos/net/topology/DefaultTopologyEdge.java
@@ -0,0 +1,66 @@
+package org.onlab.onos.net.topology;
+
+import org.onlab.onos.net.Link;
+
+import java.util.Objects;
+
+import static com.google.common.base.MoreObjects.toStringHelper;
+
+/**
+ * Implementation of the topology edge backed by a link.
+ */
+public class DefaultTopologyEdge implements TopologyEdge {
+
+    private final Link link;
+    private final TopologyVertex src;
+    private final TopologyVertex dst;
+
+    /**
+     * Creates a new topology edge.
+     *
+     * @param src  source vertex
+     * @param dst  destination vertex
+     * @param link infrastructure link
+     */
+    public DefaultTopologyEdge(TopologyVertex src, TopologyVertex dst, Link link) {
+        this.src = src;
+        this.dst = dst;
+        this.link = link;
+    }
+
+    @Override
+    public Link link() {
+        return link;
+    }
+
+    @Override
+    public TopologyVertex src() {
+        return src;
+    }
+
+    @Override
+    public TopologyVertex dst() {
+        return dst;
+    }
+
+    @Override
+    public int hashCode() {
+        return Objects.hash(link);
+    }
+
+    @Override
+    public boolean equals(Object obj) {
+        if (obj instanceof DefaultTopologyEdge) {
+            final DefaultTopologyEdge other = (DefaultTopologyEdge) obj;
+            return Objects.equals(this.link, other.link);
+        }
+        return false;
+    }
+
+    @Override
+    public String toString() {
+        return toStringHelper(this).add("src", src).add("dst", dst).toString();
+    }
+
+}
+