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diff --git a/src/main/java/org/onap/dmaap/dmf/mr/metrics/publisher/CambriaConsumer.java b/src/main/java/org/onap/dmaap/dmf/mr/metrics/publisher/CambriaConsumer.java
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+++ b/src/main/java/org/onap/dmaap/dmf/mr/metrics/publisher/CambriaConsumer.java
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+/*******************************************************************************
+ *  ============LICENSE_START=======================================================
+ *  org.onap.dmaap
+ *  ================================================================================
+ *  Copyright © 2017 AT&T Intellectual Property. All rights reserved.
+ *  ================================================================================
+ *  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.
+ *  ============LICENSE_END=========================================================
+ *  
+ *  ECOMP is a trademark and service mark of AT&T Intellectual Property.
+ *  
+ *******************************************************************************/
+package org.onap.dmaap.dmf.mr.metrics.publisher;
+
+import java.io.IOException;
+
+/**
+ * This interface will provide fetch mechanism for consumer
+ * @author nilanjana.maity
+ *
+ */
+public interface CambriaConsumer extends CambriaClient
+{
+	/**
+	 * Fetch a set of messages. The consumer's timeout and message limit are used if set in the constructor call. 
+
+	 * @return a set of messages
+	 * @throws IOException
+	 */
+	Iterable<String> fetch () throws IOException;
+
+	/**
+	 * Fetch a set of messages with an explicit timeout and limit for this call. These values
+	 * override any set in the constructor call.
+	 * 
+	 * @param timeoutMs	The amount of time in milliseconds that the server should keep the connection
+	 * open while waiting for message traffic. Use -1 for default timeout (controlled on the server-side).
+	 * @param limit A limit on the number of messages returned in a single call. Use -1 for no limit.
+	 * @return a set messages
+	 * @throws IOException if there's a problem connecting to the server
+	 */
+	Iterable<String> fetch ( int timeoutMs, int limit ) throws IOException;
+}