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 java.lang.annotation.ElementType; 021import java.lang.annotation.Retention; 022import java.lang.annotation.RetentionPolicy; 023import java.lang.annotation.Target; 024 025/** 026 * <p>Some storage backends do not guarantee that a file immediately exists on the 027 * remote side after it is uploaded or moved.<br> 028 * This feature handles such cases by relaxing the strong assumption that a file 029 * is immediately available after creation due to upload or move operations. 030 * 031 * <p>The {@link ReadAfterWriteConsistentFeatureTransferManager} throttles existence check 032 * using a simple exponential method:<br> 033 * 034 * <code>throttle(n) = 3 ^ n * 100 ms</code>, with n being the current iteration 035 * 036 * @author Christian Roth (christian.roth@port17.de) 037 */ 038@Feature(required = false) 039@Target(ElementType.TYPE) 040@Retention(RetentionPolicy.RUNTIME) 041public @interface ReadAfterWriteConsistent { 042 /** 043 * @see ReadAfterWriteConsistentFeatureExtension 044 */ 045 Class<? extends ReadAfterWriteConsistentFeatureExtension> extension(); 046 047 /** 048 * Define how often a transfer manager will try to find a file on the remote side. 049 */ 050 int maxRetries() default 5; 051 052 /** 053 * Define the maximum wait time until a file has to exist on the remote side (given in milliseconds). 054 */ 055 int maxWaitTime() default 10000; 056}