ONOS-3605 Create thread Session input stream mechanism, adding listener for events from the device

Change-Id: Ib323487f61d9e595f7ccdc1957a92e58b7002d2a
diff --git a/protocols/netconf/api/src/main/java/org/onosproject/netconf/NetconfDeviceOutputEvent.java b/protocols/netconf/api/src/main/java/org/onosproject/netconf/NetconfDeviceOutputEvent.java
new file mode 100644
index 0000000..0a140f1
--- /dev/null
+++ b/protocols/netconf/api/src/main/java/org/onosproject/netconf/NetconfDeviceOutputEvent.java
@@ -0,0 +1,105 @@
+/*
+ * 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.netconf;
+
+import org.onosproject.event.AbstractEvent;
+
+/**
+ * Describes network configuration event.
+ */
+public final class NetconfDeviceOutputEvent extends
+        AbstractEvent<NetconfDeviceOutputEvent.Type, Object> {
+
+    private final String messagePayload;
+    private final int messageID;
+    private final NetconfDeviceInfo deviceInfo;
+
+    /**
+     * Type of network configuration events.
+     */
+    public enum Type {
+        /**
+         * Signifies that sent a reply to a request.
+         */
+        DEVICE_REPLY,
+
+        /**
+         * Signifies that the device sent a notification.
+         */
+        DEVICE_NOTIFICATION,
+
+        /**
+         * Signifies that the device is not reachable.
+         */
+        DEVICE_UNREGISTERED,
+
+        /**
+         * Signifies that the device has encountered an error.
+         */
+        DEVICE_ERROR,
+
+    }
+
+    /**
+     * Creates an event of a given type and for the specified subject and the
+     * current time.
+     *
+     * @param type              event type
+     * @param subject           event subject
+     * @param payload           message from the device
+     * @param msgID             id of the message related to the event
+     * @param netconfDeviceInfo device of event
+     */
+    public NetconfDeviceOutputEvent(Type type, Object subject, String payload, int msgID,
+                                    NetconfDeviceInfo netconfDeviceInfo) {
+        super(type, subject);
+        messagePayload = payload;
+        this.messageID = msgID;
+        deviceInfo = netconfDeviceInfo;
+    }
+
+    /**
+     * Creates an event of a given type and for the specified subject and time.
+     *
+     * @param type              event type
+     * @param subject           event subject
+     * @param payload           message from the device
+     * @param msgID             id of the message related to the event
+     * @param netconfDeviceInfo device of event
+     * @param msgID             id of the message related to the event
+     * @param time              occurrence time
+     */
+    public NetconfDeviceOutputEvent(Type type, Object subject, String payload, int msgID,
+                                    NetconfDeviceInfo netconfDeviceInfo, long time) {
+        super(type, subject, time);
+        messagePayload = payload;
+        deviceInfo = netconfDeviceInfo;
+        this.messageID = msgID;
+    }
+
+    public String getMessagePayload() {
+        return messagePayload;
+    }
+
+    public NetconfDeviceInfo getDeviceInfo() {
+        return deviceInfo;
+    }
+
+    public Integer getMessageID() {
+        return messageID;
+    }
+}