[DMAAP-BC] Consolidate bus controller repos
[dmaap/buscontroller.git] / dmaap-bc / src / main / java / org / onap / dmaap / dbcapi / database / ConnWrapper.java
diff --git a/dmaap-bc/src/main/java/org/onap/dmaap/dbcapi/database/ConnWrapper.java b/dmaap-bc/src/main/java/org/onap/dmaap/dbcapi/database/ConnWrapper.java
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+/*-
+ * ============LICENSE_START=======================================================
+ * org.onap.dmaap
+ * ================================================================================
+ * 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.dmaap.dbcapi.database;
+
+import java.sql.*;
+
+import com.att.eelf.configuration.EELFLogger;
+import com.att.eelf.configuration.EELFManager;
+
+
+public abstract class ConnWrapper<T, U>        {
+       EELFLogger logger = EELFManager.getInstance().getLogger( ConnWrapper.class );
+       protected Connection c;
+       protected PreparedStatement ps;
+       protected ResultSet     rs;
+       protected abstract T run(U u) throws Exception;
+       public T protect(ConnectionFactory cf, U u) {
+               try {
+                       try {
+                               return(attempt(cf, u, false));
+                       } catch (SQLException sqle) {
+                               logger.error("Error", sqle);
+                               return(attempt(cf, u, true));
+                       }
+               } catch (RuntimeException rte) {
+                       throw rte;
+               } catch (Exception e) {
+                       throw new DBException(e);
+               }
+       }
+       private T attempt(ConnectionFactory cf, U u, boolean fresh) throws Exception {
+               c = null;
+               ps = null;
+               rs = null;
+               try {
+                       c = cf.get(fresh);
+                       T ret = run(u);
+                       cf.release(c);
+                       c = null;
+                       return(ret);
+               } finally {
+                       if (rs != null) { 
+                               try { 
+                                       rs.close(); 
+                               } catch (Exception e) {
+                                       logger.error("Error", e);
+                               }}
+                       rs = null;
+                       if (ps != null) { 
+                               try { 
+                                       ps.close(); 
+                               } catch (Exception e) {
+                                       logger.error("Error", e);
+                               }}
+                       ps = null;
+                       if (c != null) { 
+                               try { 
+                                       c.close(); 
+                               } catch (Exception e) {
+                                       logger.error("Error", e);
+                               }}
+                       c = null;
+               }
+       }
+}