1 files changed, 96 insertions, 0 deletions
diff --git a/src/main/java/org/onap/dmaap/messagerouter/msgrtr/nsa/cambria/backends/Consumer.java b/src/main/java/org/onap/dmaap/messagerouter/msgrtr/nsa/cambria/backends/Consumer.java
new file mode 100644
index 0000000..8e5aa76
--- /dev/null
+++ b/src/main/java/org/onap/dmaap/messagerouter/msgrtr/nsa/cambria/backends/Consumer.java
@@ -0,0 +1,96 @@
+/*******************************************************************************
+ *  ============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.messagerouter.msgrtr.nsa.cambria.backends;
+
+/**
+ * A consumer interface. Consumers pull the next message from a given topic.
+ * @author author
+ */
+public interface Consumer
+{	
+	/**
+	 * A message interface provide the offset and message
+	 * @author author
+	 *
+	 */
+	public interface Message
+	{	
+		/**
+		 * returning the offset of that particular message 
+		 * @return long
+		 */
+		long getOffset ();
+		/**
+		 * returning the message 
+		 * @return message
+		 */
+		String getMessage ();
+	}
+
+	/**
+	 * Get this consumer's name
+	 * @return name
+	 */
+	String getName ();
+
+	/**
+	 * Get creation time in ms
+	 * @return
+	 */
+	long getCreateTimeMs ();
+
+	/**
+	 * Get last access time in ms
+	 * @return
+	 */
+	long getLastAccessMs ();
+	
+	/**
+	 * Get the next message from this source. This method must not block.
+	 * @return the next message, or null if none are waiting
+	 */
+	Message nextMessage ();
+
+	/**
+	 * Get the next message from this source. This method must not block.
+	 * @param atOffset start with the next message at or after atOffset. -1 means next from last request
+	 * @return the next message, or null if none are waiting
+	 */
+//	Message nextMessage ( long atOffset );
+
+	/**
+	 * Close/clean up this consumer
+	 */
+	void close();
+	
+	/**
+	 * Commit the offset of the last consumed message
+	 * 
+	 */
+	void commitOffsets();
+	
+	/**
+	 * Get the offset this consumer is currently at
+	 * @return offset
+	 */
+	long getOffset();
+}