1 files changed, 81 insertions, 0 deletions
diff --git a/feature-session-persistence/src/main/java/org/onap/policy/drools/persistence/EntityMgrTrans.java b/feature-session-persistence/src/main/java/org/onap/policy/drools/persistence/EntityMgrTrans.java
new file mode 100644
index 00000000..79b620d3
--- /dev/null
+++ b/feature-session-persistence/src/main/java/org/onap/policy/drools/persistence/EntityMgrTrans.java
@@ -0,0 +1,81 @@
+/*-
+ * ============LICENSE_START=======================================================
+ * feature-session-persistence
+ * ================================================================================
+ * Copyright (C) 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=========================================================
+ */
+
+package org.onap.policy.drools.persistence;
+
+import javax.persistence.EntityManager;
+import javax.persistence.EntityTransaction;
+
+/**
+ * Wrapper for an <i>EntityManager</i> that creates a transaction that is
+ * auto-rolled back when closed.
+ */
+public class EntityMgrTrans extends EntityMgrCloser {
+
+	/**
+	 * Transaction to be rolled back.
+	 */
+	private EntityTransaction trans;
+
+	/**
+	 * 
+	 * @param em
+	 *            entity for which a transaction is to be begun
+	 */
+	public EntityMgrTrans(EntityManager em) {
+		super(em);
+
+		try {
+			trans = em.getTransaction();
+			trans.begin();
+
+		} catch (RuntimeException e) {
+			em.close();
+			throw e;
+		}
+	}
+
+	/**
+	 * Commits the transaction.
+	 */
+	public void commit() {
+		trans.commit();
+	}
+
+	/**
+	 * Rolls back the transaction.
+	 */
+	public void rollback() {
+		trans.rollback();
+	}
+
+	@Override
+	public void close() {
+		try {
+			if (trans.isActive()) {
+				trans.rollback();
+			}
+
+		} finally {
+			super.close();
+		}
+	}
+
+}