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/*
 * Copyright 2002-2018 the original author or authors.
 *
 * 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
 *
 *      https://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 org.springframework.http;

import java.io.File;
import java.nio.file.Path;

import reactor.core.publisher.Mono;

/**
 * Sub-interface of {@code ReactiveOutputMessage} that has support for "zero-copy"
 * file transfers.
 *
 * @author Arjen Poutsma
 * @author Juergen Hoeller
 * @since 5.0
 * @see Zero-copy
 */
public interface ZeroCopyHttpOutputMessage extends ReactiveHttpOutputMessage {

	/**
	 * Use the given {@link File} to write the body of the message to the underlying
	 * HTTP layer.
	 * @param file the file to transfer
	 * @param position the position within the file from which the transfer is to begin
	 * @param count the number of bytes to be transferred
	 * @return a publisher that indicates completion or error.
	 */
	default Mono writeWith(File file, long position, long count) {
		return writeWith(file.toPath(), position, count);
	}

	/**
	 * Use the given {@link Path} to write the body of the message to the underlying
	 * HTTP layer.
	 * @param file the file to transfer
	 * @param position the position within the file from which the transfer is to begin
	 * @param count the number of bytes to be transferred
	 * @return a publisher that indicates completion or error.
	 * @since 5.1
	 */
	Mono writeWith(Path file, long position, long count);

}