1 /*
2 * Tentackle - https://tentackle.org
3 *
4 * This library is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU Lesser General Public
6 * License as published by the Free Software Foundation; either
7 * version 2.1 of the License, or (at your option) any later version.
8 *
9 * This library is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 * Lesser General Public License for more details.
13 *
14 * You should have received a copy of the GNU Lesser General Public
15 * License along with this library; if not, write to the Free Software
16 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
17 */
18
19 package org.tentackle.dbms.trip;
20
21 import org.tentackle.dbms.AbstractDbOperation;
22 import org.tentackle.dbms.Db;
23 import org.tentackle.session.PersistenceException;
24
25 import java.lang.reflect.InvocationTargetException;
26
27 /**
28 * Base class for the remote delegate of AbstractDbOperation.<br>
29 * All other subclasses of AbstractDbOperation should extend AbstractDbOperationRemoteDelegateImpl to reflect
30 * the class hierarchy below AbstractDbOperation.
31 *
32 * @param <P> the database operation class
33 * @author harald
34 */
35 public class AbstractDbOperationRemoteDelegateImpl<P extends AbstractDbOperation<P>>
36 extends RemoteDbDelegateImpl<P>
37 implements AbstractDbOperationRemoteDelegate<P> {
38
39
40 /**
41 * operation object associated to the delegate's session.
42 */
43 protected P dbOperation;
44
45
46 /**
47 * Creates a delegate on the serverSession socket.
48 *
49 * @param serverSession is the TRIP server session
50 * @param clazz is the subclass of AbstractDbOperation
51 */
52 public AbstractDbOperationRemoteDelegateImpl(RemoteDbSessionImpl serverSession, Class<P> clazz) {
53 super(serverSession, clazz);
54 }
55
56
57 /**
58 * Instantiates a singe object and connect it to the db.
59 * <p>
60 * The object is used for all methods not returning a new object and thus
61 * minimizes object construction.
62 */
63 @Override
64 public void initialize() {
65 dbOperation = newInstance();
66 }
67
68
69 /**
70 * Creates a new instance of the required class
71 * for methods that return a new object.
72 * @return the new object
73 */
74 protected P newInstance() {
75 try {
76 return getServicedClass().getDeclaredConstructor(Db.class).newInstance(getSession());
77 }
78 catch (IllegalAccessException | IllegalArgumentException | InstantiationException | NoSuchMethodException |
79 InvocationTargetException e) {
80 throw new PersistenceException(getSession(), "creating object for class '" + getServicedClass() + "' failed", e);
81 }
82 }
83
84 }