1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
|
/*-
* ============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;
}
}
}
|
