src/org/sonews/storage/StorageManager.java
author cli
Mon, 06 Jun 2011 20:12:21 +0200
changeset 42 7f84f4de2893
parent 37 74139325d305
child 45 7e24949b87b0
permissions -rwxr-xr-x
Add HSQLDB stubs and reformat some source files.
     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 package org.sonews.storage;
    19 
    20 /**
    21  * Provides access to a storage backend.
    22  * @author Christian Lins
    23  * @since sonews/1.0
    24  */
    25 public final class StorageManager {
    26 
    27 	private static StorageProvider provider;
    28 
    29 	public static Storage current()
    30 			throws StorageBackendException {
    31 		synchronized (StorageManager.class) {
    32 			if (provider == null) {
    33 				return null;
    34 			} else {
    35 				return provider.storage(Thread.currentThread());
    36 			}
    37 		}
    38 	}
    39 
    40 	public static StorageProvider loadProvider(String pluginClassName) {
    41 		try {
    42 			Class<?> clazz = Class.forName(pluginClassName);
    43 			Object inst = clazz.newInstance();
    44 			return (StorageProvider) inst;
    45 		} catch (Exception ex) {
    46 			System.err.println(ex);
    47 			return null;
    48 		}
    49 	}
    50 
    51 	/**
    52 	 * Sets the current storage provider.
    53 	 * @param provider
    54 	 */
    55 	public static void enableProvider(StorageProvider provider) {
    56 		synchronized (StorageManager.class) {
    57 			if (StorageManager.provider != null) {
    58 				disableProvider();
    59 			}
    60 			StorageManager.provider = provider;
    61 		}
    62 	}
    63 
    64 	/**
    65 	 * Disables the current provider.
    66 	 */
    67 	public static void disableProvider() {
    68 		synchronized (StorageManager.class) {
    69 			provider = null;
    70 		}
    71 	}
    72 }