Java example source code file (SinkChannelImpl.java)

This example Java source code file (SinkChannelImpl.java) is included in the alvinalexander.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" ^TM.

Learn more about this Java project at its project page.

Java - Java tags/keywords

asynchronouscloseexception, error, filedescriptor, indexoutofboundsexception, ioexception, nio, pollnval, selchimpl, selectionkeyimpl, sinkchannelimpl, socketchannel

The SinkChannelImpl.java Java example source code

/*
 * Copyright (c) 2002, 2006, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.  Oracle designates this
 * particular file as subject to the "Classpath" exception as provided
 * by Oracle in the LICENSE file that accompanied this code.
 *
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
 * or visit www.oracle.com if you need additional information or have any
 * questions.
 */

/*
 */

package sun.nio.ch;

import java.io.IOException;
import java.io.FileDescriptor;
import java.nio.ByteBuffer;
import java.nio.channels.*;
import java.nio.channels.spi.*;


/**
 * Pipe.SinkChannel implementation based on socket connection.
 */

class SinkChannelImpl
    extends Pipe.SinkChannel
    implements SelChImpl
{
    // The SocketChannel assoicated with this pipe
    SocketChannel sc;

    public FileDescriptor getFD() {
        return ((SocketChannelImpl)sc).getFD();
    }

    public int getFDVal() {
        return ((SocketChannelImpl)sc).getFDVal();
    }

    SinkChannelImpl(SelectorProvider sp, SocketChannel sc) {
        super(sp);
        this.sc = sc;
    }

    protected void implCloseSelectableChannel() throws IOException {
        if (!isRegistered())
            kill();
    }

    public void kill() throws IOException {
        sc.close();
    }

    protected void implConfigureBlocking(boolean block) throws IOException {
        sc.configureBlocking(block);
    }

    public boolean translateReadyOps(int ops, int initialOps,
                                     SelectionKeyImpl sk) {
        int intOps = sk.nioInterestOps(); // Do this just once, it synchronizes
        int oldOps = sk.nioReadyOps();
        int newOps = initialOps;

        if ((ops & PollArrayWrapper.POLLNVAL) != 0)
            throw new Error("POLLNVAL detected");

        if ((ops & (PollArrayWrapper.POLLERR
                    | PollArrayWrapper.POLLHUP)) != 0) {
            newOps = intOps;
            sk.nioReadyOps(newOps);
            return (newOps & ~oldOps) != 0;
        }

        if (((ops & PollArrayWrapper.POLLOUT) != 0) &&
            ((intOps & SelectionKey.OP_WRITE) != 0))
            newOps |= SelectionKey.OP_WRITE;

        sk.nioReadyOps(newOps);
        return (newOps & ~oldOps) != 0;
    }

    public boolean translateAndUpdateReadyOps(int ops, SelectionKeyImpl sk) {
        return translateReadyOps(ops, sk.nioReadyOps(), sk);
    }

    public boolean translateAndSetReadyOps(int ops, SelectionKeyImpl sk) {
        return translateReadyOps(ops, 0, sk);
    }

    public void translateAndSetInterestOps(int ops, SelectionKeyImpl sk) {
        if ((ops & SelectionKey.OP_WRITE) != 0)
            ops = PollArrayWrapper.POLLOUT;
        sk.selector.putEventOps(sk, ops);
    }

    public int write(ByteBuffer src) throws IOException {
        try {
            return sc.write(src);
        } catch (AsynchronousCloseException x) {
            close();
            throw x;
        }
    }

    public long write(ByteBuffer[] srcs) throws IOException {
        try {
            return sc.write(srcs);
        } catch (AsynchronousCloseException x) {
            close();
            throw x;
        }
    }

    public long write(ByteBuffer[] srcs, int offset, int length)
        throws IOException
    {
        if ((offset < 0) || (length < 0) || (offset > srcs.length - length))
           throw new IndexOutOfBoundsException();
        try {
            return write(Util.subsequence(srcs, offset, length));
        } catch (AsynchronousCloseException x) {
            close();
            throw x;
        }
    }
}