Source Code Cross Referenced for ScatteringByteChannel.java in  » Apache-Harmony-Java-SE » java-package » java » nio » channels » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Apache Harmony Java SE » java package » java.nio.channels 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /* Licensed to the Apache Software Foundation (ASF) under one or more
002:         * contributor license agreements.  See the NOTICE file distributed with
003:         * this work for additional information regarding copyright ownership.
004:         * The ASF licenses this file to You under the Apache License, Version 2.0
005:         * (the "License"); you may not use this file except in compliance with
006:         * the License.  You may obtain a copy of the License at
007:         * 
008:         *     http://www.apache.org/licenses/LICENSE-2.0
009:         * 
010:         * Unless required by applicable law or agreed to in writing, software
011:         * distributed under the License is distributed on an "AS IS" BASIS,
012:         * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
013:         * See the License for the specific language governing permissions and
014:         * limitations under the License.
015:         */
016:
017:        package java.nio.channels;
018:
019:        import java.io.IOException;
020:        import java.nio.ByteBuffer;
021:
022:        /**
023:         * The interface to channels that can read a set of buffers in a single
024:         * operation.
025:         * <p>
026:         * The corresponding interface for writes is called
027:         * <code>GatheringByteChannel</code>.
028:         */
029:        public interface ScatteringByteChannel extends ReadableByteChannel {
030:
031:            /**
032:             * Reads bytes from the channel into all the given buffers.
033:             * <p>
034:             * This method is equivalent to:
035:             * 
036:             * <pre>
037:             * read(buffers, 0, buffers.length);
038:             * </pre>
039:             * 
040:             * </p>
041:             * 
042:             * @param buffers
043:             *            the array of byte buffers to receive the bytes being read.
044:             * @return the number of bytes actually read.
045:             * @throws ClosedChannelException
046:             *             if the channel is closed.
047:             * @throws NonReadableChannelException
048:             *             if the channel is open, but not in a mode that permits
049:             *             reading.
050:             * @throws ClosedByInterruptException
051:             *             if the thread is interrupted in its IO operation by another
052:             *             thread closing the channel.
053:             * @throws AsynchronousCloseException
054:             *             if the read is interrupted by another thread sending an
055:             *             explicit interrupt.
056:             * @throws IOException
057:             *             if some other type of exception occurs. Details are in the
058:             *             message.
059:             */
060:            public long read(ByteBuffer[] buffers) throws IOException;
061:
062:            /**
063:             * Reads bytes from the channel into a subset of the given buffers.
064:             * <p>
065:             * This method attempts to read all of the <code>remaining()</code> bytes
066:             * from <code>length</code> byte buffers, in order, starting at
067:             * <code>buffers[offset]</code>. The number of bytes actually read is
068:             * returned.
069:             * </p>
070:             * <p>
071:             * If a read operation is in progress, subsequent threads will block until
072:             * the read is completed, and will then contend for the ability to read.
073:             * </p>
074:             * 
075:             * @param buffers
076:             *            the array of byte buffers into which the bytes will be read.
077:             * @param offset
078:             *            the index of the first buffer to read.
079:             * @param length
080:             *            the maximum number of buffers to read.
081:             * @return the number of bytes actually read.
082:             * @throws IndexOutOfBoundsException
083:             *             if offset < 0 or > buffers.length; or length < 0 or >
084:             *             buffers.length - offset.
085:             * @throws NonReadableChannelException
086:             *             if the channel was not opened for reading.
087:             * @throws ClosedChannelException
088:             *             the channel is currently closed.
089:             * @throws AsynchronousCloseException
090:             *             the channel was closed by another thread while the write was
091:             *             underway.
092:             * @throws ClosedByInterruptException
093:             *             the thread was interrupted by another thread while the write
094:             *             was underway.
095:             * @throws IOException
096:             *             if some other type of exception occurs. Details are in the
097:             *             message.
098:             */
099:            public long read(ByteBuffer[] buffers, int offset, int length)
100:                    throws IOException;
101:        }
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