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diff --git a/src/main/java/org/onap/dmaap/dmf/mr/transaction/DMaaPTransactionObjDB.java b/src/main/java/org/onap/dmaap/dmf/mr/transaction/DMaaPTransactionObjDB.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.transaction;
+
+import com.att.nsa.configs.ConfigDbException;
+import com.att.nsa.security.NsaSecurityManagerException;
+
+import java.util.Set;
+
+
+/**
+ * Persistent storage for Transaction Object and secrets built over an abstract config db. Instances
+ * of this DB must support concurrent access.
+ * @author nilanjana.maity
+ *
+ * @param <K> DMaaPTransactionObj
+ */
+public interface DMaaPTransactionObjDB <K extends DMaaPTransactionObj> {
+
+
+	/**
+	 * Create a new Transaction Object. If one exists, 
+	 * @param id
+	 * @return the new Transaction record
+	 * @throws ConfigDbException 
+	 */
+	K createTransactionObj (String id) throws KeyExistsException, ConfigDbException;
+
+
+	/**
+	 * An exception to signal a Transaction object already exists 
+	 * @author nilanjana.maity
+	 *
+	 */
+	public static class KeyExistsException extends NsaSecurityManagerException
+	{
+		/**
+		 * If the key exists
+		 * @param key
+		 */
+		public KeyExistsException ( String key ) { super ( "Transaction Object " + key + " exists" ); }
+		private static final long serialVersionUID = 1L;
+	}
+
+	/**
+	 * Save a Transaction Object record. This must be used after changing auxiliary data on the record.
+	 * Note that the transaction must exist (via createTransactionObj). 
+	 * @param transactionObj
+	 * @throws ConfigDbException 
+	 */
+	void saveTransactionObj ( K transactionObj ) throws ConfigDbException;
+	
+	/**
+	 * Load an Transaction Object record based on the Transaction ID value
+	 * @param transactionId
+	 * @return a transaction record or null
+	 * @throws ConfigDbException 
+	 */
+	K loadTransactionObj ( String transactionId ) throws ConfigDbException;
+	
+	/**
+	 * Load all Transaction objects.
+	 * @return
+	 * @throws ConfigDbException
+	 */
+	Set<String> loadAllTransactionObjs () throws ConfigDbException;
+}
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