org/sonews/storage/impl/JDBCDatabaseProvider.java
author cli
Sun, 09 May 2010 12:38:46 +0200
changeset 30 146b3275b792
parent 3 2fdc9cc89502
permissions -rw-r--r--
The StorageBackendException is catched two times so that the user see the "500 internal server error" only at the second catch (probably fixes #5).
     1 /*
     2  *   SONEWS News Server
     3  *   see AUTHORS for the list of contributors
     4  *
     5  *   This program is free software: you can redistribute it and/or modify
     6  *   it under the terms of the GNU General Public License as published by
     7  *   the Free Software Foundation, either version 3 of the License, or
     8  *   (at your option) any later version.
     9  *
    10  *   This program is distributed in the hope that it will be useful,
    11  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
    12  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    13  *   GNU General Public License for more details.
    14  *
    15  *   You should have received a copy of the GNU General Public License
    16  *   along with this program.  If not, see <http://www.gnu.org/licenses/>.
    17  */
    18 
    19 package org.sonews.storage.impl;
    20 
    21 import java.sql.SQLException;
    22 import java.util.Map;
    23 import java.util.concurrent.ConcurrentHashMap;
    24 import org.sonews.storage.Storage;
    25 import org.sonews.storage.StorageBackendException;
    26 import org.sonews.storage.StorageProvider;
    27 
    28 /**
    29  *
    30  * @author Christian Lins
    31  * @since sonews/1.0
    32  */
    33 public class JDBCDatabaseProvider implements StorageProvider
    34 {
    35 
    36   protected static final Map<Thread, JDBCDatabase> instances
    37     = new ConcurrentHashMap<Thread, JDBCDatabase>();
    38 
    39   @Override
    40   public boolean isSupported(String uri)
    41   {
    42     throw new UnsupportedOperationException("Not supported yet.");
    43   }
    44 
    45   @Override
    46   public Storage storage(Thread thread)
    47     throws StorageBackendException
    48   {
    49     try
    50     {
    51     if(!instances.containsKey(Thread.currentThread()))
    52     {
    53       JDBCDatabase db = new JDBCDatabase();
    54       db.arise();
    55       instances.put(Thread.currentThread(), db);
    56       return db;
    57     }
    58     else
    59     {
    60       return instances.get(Thread.currentThread());
    61     }
    62     }
    63     catch(SQLException ex)
    64     {
    65       throw new StorageBackendException(ex);
    66     }
    67   }
    68 
    69 }