JDK 11 java.base.jmod - Base Module

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java/nio/channels/ScatteringByteChannel.java

/*
 * Copyright (c) 2000, 2006, Oracle and/or its affiliates. All rights reserved.
 * ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
 *
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 */

package java.nio.channels;

import java.io.IOException;
import java.nio.ByteBuffer;


/**
 * A channel that can read bytes into a sequence of buffers.
 *
 * <p> A <i>scattering</i> read operation reads, in a single invocation, a
 * sequence of bytes into one or more of a given sequence of buffers.
 * Scattering reads are often useful when implementing network protocols or
 * file formats that, for example, group data into segments consisting of one
 * or more fixed-length headers followed by a variable-length body.  Similar
 * <i>gathering</i> write operations are defined in the {@link
 * GatheringByteChannel} interface.  </p>
 *
 *
 * @author Mark Reinhold
 * @author JSR-51 Expert Group
 * @since 1.4
 */

public interface ScatteringByteChannel
    extends ReadableByteChannel
{

    /**
     * Reads a sequence of bytes from this channel into a subsequence of the
     * given buffers.
     *
     * <p> An invocation of this method attempts to read up to <i>r</i> bytes
     * from this channel, where <i>r</i> is the total number of bytes remaining
     * the specified subsequence of the given buffer array, that is,
     *
     * <blockquote><pre>
     * dsts[offset].remaining()
     *     + dsts[offset+1].remaining()
     *     + ... + dsts[offset+length-1].remaining()</pre></blockquote>
     *
     * at the moment that this method is invoked.
     *
     * <p> Suppose that a byte sequence of length <i>n</i> is read, where
     * {@code 0}&nbsp;{@code <=}&nbsp;<i>n</i>&nbsp;{@code <=}&nbsp;<i>r</i>.
     * Up to the first {@code dsts[offset].remaining()} bytes of this sequence
     * are transferred into buffer {@code dsts[offset]}, up to the next
     * {@code dsts[offset+1].remaining()} bytes are transferred into buffer
     * {@code dsts[offset+1]}, and so forth, until the entire byte sequence
     * is transferred into the given buffers.  As many bytes as possible are
     * transferred into each buffer, hence the final position of each updated
     * buffer, except the last updated buffer, is guaranteed to be equal to
     * that buffer's limit.
     *
     * <p> This method may be invoked at any time.  If another thread has
     * already initiated a read operation upon this channel, however, then an
     * invocation of this method will block until the first operation is
     * complete. </p>
     *
     * @param  dsts
     *         The buffers into which bytes are to be transferred
     *
     * @param  offset
     *         The offset within the buffer array of the first buffer into
     *         which bytes are to be transferred; must be non-negative and no
     *         larger than {@code dsts.length}
     *
     * @param  length
     *         The maximum number of buffers to be accessed; must be
     *         non-negative and no larger than
     *         {@code dsts.length}&nbsp;-&nbsp;{@code offset}
     *
     * @return The number of bytes read, possibly zero,
     *         or {@code -1} if the channel has reached end-of-stream
     *
     * @throws  IndexOutOfBoundsException
     *          If the preconditions on the {@code offset} and {@code length}
     *          parameters do not hold
     *
     * @throws  NonReadableChannelException
     *          If this channel was not opened for reading
     *
     * @throws  ClosedChannelException
     *          If this channel is closed
     *
     * @throws  AsynchronousCloseException
     *          If another thread closes this channel
     *          while the read operation is in progress
     *
     * @throws  ClosedByInterruptException
     *          If another thread interrupts the current thread
     *          while the read operation is in progress, thereby
     *          closing the channel and setting the current thread's
     *          interrupt status
     *
     * @throws  IOException
     *          If some other I/O error occurs
     */
    public long read(ByteBuffer[] dsts, int offset, int length)
        throws IOException;

    /**
     * Reads a sequence of bytes from this channel into the given buffers.
     *
     * <p> An invocation of this method of the form {@code c.read(dsts)}
     * behaves in exactly the same manner as the invocation
     *
     * <blockquote><pre>
     * c.read(dsts, 0, dsts.length);</pre></blockquote>
     *
     * @param  dsts
     *         The buffers into which bytes are to be transferred
     *
     * @return The number of bytes read, possibly zero,
     *         or {@code -1} if the channel has reached end-of-stream
     *
     * @throws  NonReadableChannelException
     *          If this channel was not opened for reading
     *
     * @throws  ClosedChannelException
     *          If this channel is closed
     *
     * @throws  AsynchronousCloseException
     *          If another thread closes this channel
     *          while the read operation is in progress
     *
     * @throws  ClosedByInterruptException
     *          If another thread interrupts the current thread
     *          while the read operation is in progress, thereby
     *          closing the channel and setting the current thread's
     *          interrupt status
     *
     * @throws  IOException
     *          If some other I/O error occurs
     */
    public long read(ByteBuffer[] dsts) throws IOException;

}

java/nio/channels/ScatteringByteChannel.java

 

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Release date: 2018-11-04
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