DMAAP-83 Initial code import

[dmaap/dbcapi.git] / src / main / java / org / onap / dmaap / dbcapi / aaf / database / ConnWrapper.java

diff --git a/src/main/java/org/onap/dmaap/dbcapi/aaf/database/ConnWrapper.java b/src/main/java/org/onap/dmaap/dbcapi/aaf/database/ConnWrapper.java
new file mode 100644 (file)
index 0000000..019caef
--- /dev/null
+++ b/src/main/java/org/onap/dmaap/dbcapi/aaf/database/ConnWrapper.java
@@ -0,0 +1,63 @@
+/*-
+ * ============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.aaf.database;
+
+import java.sql.*;
+
+
+public abstract class ConnWrapper<T, U>        {
+       protected Connection c;
+       protected PreparedStatement ps;
+       protected ResultSet     rs;
+       protected abstract T run(U u) throws Exception;
+       public T protect(ConnectionFactory cf, U u) throws DBException {
+               try {
+                       try {
+                               return(attempt(cf, u, false));
+                       } catch (SQLException 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) {}}
+                       rs = null;
+                       if (ps != null) { try { ps.close(); } catch (Exception e) {}}
+                       ps = null;
+                       if (c != null) { try { c.close(); } catch (Exception e) {}}
+                       c = null;
+               }
+       }
+}