src/org/sonews/storage/StorageManager.java
author František Kučera <franta-hg@frantovo.cz>
Tue Oct 11 01:17:30 2011 +0200 (2011-10-11)
changeset 69 b51612c18a54
parent 42 7f84f4de2893
permissions -rwxr-xr-x
Drupal: správné kódování češtiny.
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/*
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 *   SONEWS News Server
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 *   see AUTHORS for the list of contributors
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 *
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 *   This program is free software: you can redistribute it and/or modify
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 *   it under the terms of the GNU General Public License as published by
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 *   the Free Software Foundation, either version 3 of the License, or
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 *   (at your option) any later version.
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 *
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 *   This program is distributed in the hope that it will be useful,
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 *   but WITHOUT ANY WARRANTY; without even the implied warranty of
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 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
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 *   GNU General Public License for more details.
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 *
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 *   You should have received a copy of the GNU General Public License
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 *   along with this program.  If not, see <http://www.gnu.org/licenses/>.
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 */
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package org.sonews.storage;
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/**
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 * Provides access to a storage backend.
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 * @author Christian Lins
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 * @since sonews/1.0
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 */
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public final class StorageManager {
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	private static StorageProvider provider;
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	public static Storage current() throws StorageBackendException {
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		synchronized (StorageManager.class) {
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			if (provider == null) {
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				return null;
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			} else {
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				return provider.storage(Thread.currentThread());
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			}
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		}
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	}
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	public static StorageProvider loadProvider(String pluginClassName) {
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		try {
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			Class<?> clazz = Class.forName(pluginClassName);
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			Object inst = clazz.newInstance();
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			return (StorageProvider)inst;
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		} catch (Exception ex) {
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			System.err.println(ex);
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			return null;
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		}
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	}
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	/**
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	 * Sets the current storage provider.
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	 * @param provider
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	 */
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	public static void enableProvider(StorageProvider provider) {
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		synchronized (StorageManager.class) {
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			if (StorageManager.provider != null) {
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				disableProvider();
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			}
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			StorageManager.provider = provider;
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		}
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	}
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	/**
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	 * Disables the current provider.
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	 */
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	public static void disableProvider() {
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		synchronized (StorageManager.class) {
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			provider = null;
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		}
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	}
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}