TransactionWithQueryExecuter


1   //Prevayler(TM) - The Free-Software Prevalence Layer.
2   //Copyright (C) 2001-2003 Klaus Wuestefeld
3   //This library is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
4   
5   package org.prevayler.implementation;
6   
7   import java.util.Date  ;
8   
9   import org.prevayler.*;
10  
11  
12  class TransactionWithQueryExecuter implements Transaction {
13  
14      static final long serialVersionUID = 0L;
15  
16      private TransactionWithQuery _delegate;
17  
18      private transient Object   _result;
19      private transient Exception   _exception;
20  
21  
22      private TransactionWithQueryExecuter() {} //Necessary for Skaringa XML serialization
23      TransactionWithQueryExecuter(TransactionWithQuery transactionWithQuery) {
24          _delegate = transactionWithQuery;
25      }
26  
27      public final void executeOn(Object   prevalentSystem, Date   timestamp) {
28          try {
29              _result = _delegate.executeAndQuery(prevalentSystem, timestamp);
30          } catch (RuntimeException   rx) {
31              throw rx;   //This is necessary because of the rollback feature.
32          } catch (Exception   ex) {
33              _exception = ex;
34          }
35      }
36  
37      Object   result() throws Exception   {
38          if (_exception != null) throw _exception;
39          return _result;
40      }
41  
42  }

A to Z: JavaDoc & Examples Daily Java News & Articles Open Source Projects Open Source Codes Free Computer Books Remove Frame

Popular Tags