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/*
 * Copyright 2012 The Netty Project
 *
 * The Netty Project licenses this file to you 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 io.netty.handler.stream;


import io.netty.buffer.ByteBufAllocator;
import io.netty.channel.ChannelHandlerContext;

/**
 * A data stream of indefinite length which is consumed by {@link ChunkedWriteHandler}.
 */
public interface ChunkedInput {

    /**
     * Return {@code true} if and only if there is no data left in the stream
     * and the stream has reached at its end.
     */
    boolean isEndOfInput() throws Exception;

    /**
     * Releases the resources associated with the input.
     */
    void close() throws Exception;

    /**
     * @deprecated Use {@link #readChunk(ByteBufAllocator)}.
     *
     * 

Fetches a chunked data from the stream. Once this method returns the last chunk * and thus the stream has reached at its end, any subsequent {@link #isEndOfInput()} * call must return {@code true}. * * @param ctx The context which provides a {@link ByteBufAllocator} if buffer allocation is necessary. * @return the fetched chunk. * {@code null} if there is no data left in the stream. * Please note that {@code null} does not necessarily mean that the * stream has reached at its end. In a slow stream, the next chunk * might be unavailable just momentarily. */ @Deprecated B readChunk(ChannelHandlerContext ctx) throws Exception; /** * Fetches a chunked data from the stream. Once this method returns the last chunk * and thus the stream has reached at its end, any subsequent {@link #isEndOfInput()} * call must return {@code true}. * * @param allocator {@link ByteBufAllocator} if buffer allocation is necessary. * @return the fetched chunk. * {@code null} if there is no data left in the stream. * Please note that {@code null} does not necessarily mean that the * stream has reached at its end. In a slow stream, the next chunk * might be unavailable just momentarily. */ B readChunk(ByteBufAllocator allocator) throws Exception; /** * Returns the length of the input. * @return the length of the input if the length of the input is known. * a negative value if the length of the input is unknown. */ long length(); /** * Returns current transfer progress. */ long progress(); }





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