001/*
002 * Licensed to the Apache Software Foundation (ASF) under one or more
003 * contributor license agreements.  See the NOTICE file distributed with
004 * this work for additional information regarding copyright ownership.
005 * The ASF licenses this file to You under the Apache License, Version 2.0
006 * (the "License"); you may not use this file except in compliance with
007 * the License.  You may obtain a copy of the License at
008 *
009 *      http://www.apache.org/licenses/LICENSE-2.0
010 *
011 * Unless required by applicable law or agreed to in writing, software
012 * distributed under the License is distributed on an "AS IS" BASIS,
013 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
014 * See the License for the specific language governing permissions and
015 * limitations under the License.
016 */
017package org.apache.commons.vfs2.provider.webdav;
018
019import java.io.IOException;
020
021import org.apache.commons.httpclient.HttpMethod;
022import org.apache.commons.httpclient.HttpMethodRetryHandler;
023
024/**
025 * A retry handler which will retry a failed webdav method one time.
026 * <p>
027 * Now that webdavlib didnt support adding a MethodRetryHandler only a few operations are restartable yet.
028 * </p>
029 *
030 * @since 2.0
031 */
032public final class WebdavMethodRetryHandler implements HttpMethodRetryHandler {
033
034    private static final WebdavMethodRetryHandler INSTANCE = new WebdavMethodRetryHandler();
035
036    /**
037     * Gets the singleton instance.
038     *
039     * @return the singleton instance.
040     */
041    public static WebdavMethodRetryHandler getInstance() {
042        return INSTANCE;
043    }
044
045    /**
046     * Constructs a new instance.
047     */
048    private WebdavMethodRetryHandler() {
049    }
050
051    @Override
052    public boolean retryMethod(final HttpMethod method, final IOException exception, final int executionCount) {
053        return executionCount < 2;
054    }
055}