Interfaces added for PCEP messages and PCEP Controller

Change-Id: Id678b6832b42bcf4a437322996244d224c4052d0
diff --git a/pcep/api/src/main/java/org/onosproject/pcep/controller/PcepClient.java b/pcep/api/src/main/java/org/onosproject/pcep/controller/PcepClient.java
new file mode 100755
index 0000000..2c478ec
--- /dev/null
+++ b/pcep/api/src/main/java/org/onosproject/pcep/controller/PcepClient.java
@@ -0,0 +1,110 @@
+/*
+ * 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;
+
+import java.util.List;
+
+import org.onosproject.pcepio.protocol.PcepFactory;
+import org.onosproject.pcepio.protocol.PcepMessage;
+
+/**
+ * Represents to provider facing side of a path computation client(pcc).
+ */
+public interface PcepClient {
+
+    /**
+     * Writes the message to the driver.
+     *
+     * @param msg the message to write
+     */
+    public void sendMessage(PcepMessage msg);
+
+    /**
+     * Writes the PcepMessage list to the driver.
+     *
+     * @param msgs the messages to be written
+     */
+    public void sendMessage(List<PcepMessage> msgs);
+
+    /**
+     * Handle a message from the pcc.
+     *
+     * @param fromClient the message to handle
+     */
+    public void handleMessage(PcepMessage fromClient);
+
+    /**
+     * Provides the factory for this PCEP version.
+     *
+     * @return PCEP version specific factory.
+     */
+    public PcepFactory factory();
+
+    /**
+     * Gets a string version of the ID for this pcc.
+     *
+     * @return string version of the ID
+     */
+    public String getStringId();
+
+    /**
+     * Gets the ipAddress of the client.
+     *
+     * @return the client pccId in IPAddress format
+     */
+    public PccId getPccId();
+
+    /**
+     * Checks if the pcc is still connected.
+     *
+     * @return true if client is connected, false otherwise
+     */
+    public boolean isConnected();
+
+    /**
+     * Disconnects the pcc by closing the TCP connection. Results in a call
+     * to the channel handler's channelDisconnected method for cleanup.
+     */
+    public void disconnectClient();
+
+    /**
+     * Indicates if this pcc is optical.
+     *
+     * @return true if optical
+     */
+    public boolean isOptical();
+
+    /**
+     * Identifies the channel used to communicate with the pcc.
+     *
+     * @return string representation of the connection to the client
+     */
+    public String channelId();
+
+    /**
+     * To set the status of state synchronization.
+     *
+     * @param value to set the synchronization status
+     */
+    public void setIsSyncComplete(boolean value);
+
+    /**
+     * Indicates the state synchronization status of this pcc.
+     *
+     * @return true/false if the synchronization is completed/not completed
+     */
+    public boolean isSyncComplete();
+}