de.shadowhunt.http.client.SubversionRequestRetryHandler Maven / Gradle / Ivy

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/**
 * Copyright (C) 2013 shadowhunt ([email protected])
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *         http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package de.shadowhunt.http.client;

import java.util.HashMap;
import java.util.Locale;
import java.util.Map;

import org.apache.http.HttpRequest;
import org.apache.http.annotation.Immutable;
import org.apache.http.impl.client.DefaultHttpRequestRetryHandler;

/**
 * A {@link SubversionRequestRetryHandler} which retires all requested
 * HTTP and DAV methods which should be idempotent according to RFC-2616.
 */
@Immutable
public class SubversionRequestRetryHandler extends DefaultHttpRequestRetryHandler {

    private final Map idempotentMethods;

    /**
     * Create a {@link SubversionRequestRetryHandler} with default settings
     */
    public SubversionRequestRetryHandler() {
        this(3, true);
    }

    /**
     * Create a {@link SubversionRequestRetryHandler}
     *
     * @param retryCount number of times a method will be retried
     * @param requestSentRetryEnabled whether or not methods that have successfully sent their request will be retried
     */
    public SubversionRequestRetryHandler(final int retryCount, final boolean requestSentRetryEnabled) {
        super(retryCount, requestSentRetryEnabled);

        idempotentMethods = new HashMap<>();
        // http
        idempotentMethods.put("DELETE", Boolean.TRUE);
        idempotentMethods.put("GET", Boolean.TRUE);
        idempotentMethods.put("HEAD", Boolean.TRUE);
        idempotentMethods.put("OPTIONS", Boolean.TRUE);
        idempotentMethods.put("PUT", Boolean.TRUE);
        // NOTE: POST request are only used to create transactional resources in httpv2,
        // these POST requests, don't have any state => they can be retried
        idempotentMethods.put("POST", Boolean.TRUE);
        idempotentMethods.put("TRACE", Boolean.TRUE);

        // webdav
        idempotentMethods.put("CHECKOUT", Boolean.TRUE);
        idempotentMethods.put("COPY", Boolean.TRUE);
        idempotentMethods.put("LOCK", Boolean.TRUE);
        idempotentMethods.put("MERGE", Boolean.TRUE);
        idempotentMethods.put("MKACTIVITY", Boolean.TRUE);
        idempotentMethods.put("MKCOL", Boolean.FALSE); // not idempotent
        idempotentMethods.put("PROPFIND", Boolean.TRUE);
        idempotentMethods.put("PROPPATCH", Boolean.TRUE);
        idempotentMethods.put("REPORT", Boolean.TRUE);
        idempotentMethods.put("UNLOCK", Boolean.TRUE);
    }

    @Override
    protected boolean handleAsIdempotent(final HttpRequest request) {
        final String method = request.getRequestLine().getMethod().toUpperCase(Locale.US);
        final Boolean b = idempotentMethods.get(method);
        return (b != null) && b;
    }
}