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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:
 *
 *   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 io.netty5.handler.stream;

import io.netty5.buffer.BufferAllocator;

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

    /**
     * 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 BufferAllocator} 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(BufferAllocator 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();
}