Interfaces added for PCEP messages and PCEP Controller

Change-Id: Id678b6832b42bcf4a437322996244d224c4052d0
diff --git a/pcep/api/src/main/java/org/onosproject/pcep/controller/driver/PcepAgent.java b/pcep/api/src/main/java/org/onosproject/pcep/controller/driver/PcepAgent.java
new file mode 100755
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+++ b/pcep/api/src/main/java/org/onosproject/pcep/controller/driver/PcepAgent.java
@@ -0,0 +1,63 @@
+/*
+ * 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.pcep.controller.driver;
+
+import org.onosproject.pcep.controller.PccId;
+import org.onosproject.pcep.controller.PcepClient;
+import org.onosproject.pcepio.protocol.PcepMessage;
+
+/**
+ * Responsible for keeping track of the current set Pcep clients
+ * connected to the system.
+ *
+ */
+public interface PcepAgent {
+
+    /**
+     * Add a pcc client that has just connected to the system.
+     *
+     * @param pccId the id of pcc client to add
+     * @param pc the actual pce client object.
+     * @return true if added, false otherwise.
+     */
+    public boolean addConnectedClient(PccId pccId, PcepClient pc);
+
+    /**
+     * Checks if the activation for this pcc client is valid.
+     *
+     * @param pccId the id of pcc client to check
+     * @return true if valid, false otherwise
+     */
+    public boolean validActivation(PccId pccId);
+
+    /**
+     * Clear all state in controller client maps for a pcc client that has
+     * disconnected from the local controller. Also release control for
+     * that pccIds client from the global repository. Notify client listeners.
+     *
+     * @param pccIds the id of pcc client to remove.
+     */
+    public void removeConnectedClient(PccId pccIds);
+
+    /**
+     * Process a message coming from a pcc client.
+     *
+     * @param pccId the id of pcc client the message was received.
+     * @param m the message to process
+     */
+    public void processPcepMessage(PccId pccId, PcepMessage m);
+
+}