001/*
002 * Syncany, www.syncany.org
003 * Copyright (C) 2011-2016 Philipp C. Heckel <philipp.heckel@gmail.com>
004 *
005 * This program is free software: you can redistribute it and/or modify
006 * it under the terms of the GNU General Public License as published by
007 * the Free Software Foundation, either version 3 of the License, or
008 * (at your option) any later version.
009 *
010 * This program is distributed in the hope that it will be useful,
011 * but WITHOUT ANY WARRANTY; without even the implied warranty of
012 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
013 * GNU General Public License for more details.
014 *
015 * You should have received a copy of the GNU General Public License
016 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
017 */
018package org.syncany.plugins.transfer.features;
019
020import org.syncany.plugins.transfer.StorageException;
021import org.syncany.plugins.transfer.TransferManager;
022import org.syncany.plugins.transfer.files.RemoteFile;
023
024/**
025 * The read write consistent feature extension must be defined in the {@link ReadAfterWriteConsistent}
026 * feature in order to extend a {@link TransferManager} that was marked as 'read write consistent'
027 * with the required methods to verify if a file exists on the remote side.
028 *
029 * @author Christian Roth (christian.roth@port17.de)
030 */
031public interface ReadAfterWriteConsistentFeatureExtension extends FeatureExtension {
032        /**
033         * Check if a file on the remote side already exists.
034         *
035         * @param remoteFile The file to look up
036         * @return True if the file exists and is accessible and false otherwise
037         * @throws StorageException Thrown if an error occurred
038         */
039        boolean exists(RemoteFile remoteFile) throws StorageException;
040}