[ONOS-2262] - OVSDB -- Create the implementation of HostProvider using
OVSDB prototol.
1.Notify the Host System when the ovsdb vm port is added.
2.Notify the Host System when the ovsdb vm port is removed.
Change-Id: I46355cec84db897360a6eb37190a5bd7a8f3047d
diff --git a/ovsdb/api/src/main/java/org/onosproject/ovsdb/controller/OvsdbEventSubject.java b/ovsdb/api/src/main/java/org/onosproject/ovsdb/controller/OvsdbEventSubject.java
new file mode 100644
index 0000000..263027f
--- /dev/null
+++ b/ovsdb/api/src/main/java/org/onosproject/ovsdb/controller/OvsdbEventSubject.java
@@ -0,0 +1,75 @@
+/*
+ * Copyright 2015 Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.onosproject.ovsdb.controller;
+
+import java.util.Set;
+
+import org.onlab.packet.IpAddress;
+import org.onlab.packet.MacAddress;
+
+/**
+ * Represents for a entity that carry important information for listener.
+ */
+public interface OvsdbEventSubject extends EventSubject {
+ /**
+ * Returns the MAC address associated with this host (NIC).
+ *
+ * @return the MAC address of this host
+ */
+ MacAddress hwAddress();
+
+ /**
+ * Returns the IP address associated with this host's MAC.
+ *
+ * @return host IP address
+ */
+ Set<IpAddress> ipAddress();
+
+ /**
+ * Returns the Port name associated with the host.
+ *
+ * @return port name
+ */
+ OvsdbPortName portName();
+
+ /**
+ * Returns the Port number associated with the host.
+ *
+ * @return port number
+ */
+ OvsdbPortNumber portNumber();
+
+ /**
+ * Returns the Port type associated with the host.
+ *
+ * @return port type
+ */
+ OvsdbPortType portType();
+
+ /**
+ * Returns the Ovs dpid associated with the host.
+ *
+ * @return Ovs dpid
+ */
+ OvsdbDatapathId dpid();
+
+ /**
+ * Returns the vm ifaceid associated with the host.
+ *
+ * @return vm ifaceid
+ */
+ OvsdbIfaceId ifaceid();
+}