BEGIN LICENSE BLOCK *****
Version: EPL 2.0/GPL 2.0/LGPL 2.1
The contents of this file are subject to the Eclipse Public
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.eclipse.org/legal/epl-v20.html
Software distributed under the License is distributed on an "AS
IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
implied. See the License for the specific language governing
rights and limitations under the License.
Copyright (C) 2008 Ola Bini 
Alternatively, the contents of this file may be used under the terms of
either of the GNU General Public License Version 2 or later (the "GPL"),
or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
in which case the provisions of the GPL or the LGPL are applicable instead
of those above. If you wish to allow use of your version of this file only
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use your version of this file under the terms of the EPL, indicate your
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END LICENSE BLOCK /***** BEGIN LICENSE BLOCK *****
 * Version: EPL 2.0/GPL 2.0/LGPL 2.1
 *
 * The contents of this file are subject to the Eclipse Public
 * 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.eclipse.org/legal/epl-v20.html
 *
 * Software distributed under the License is distributed on an "AS
 * IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
 * implied. See the License for the specific language governing
 * rights and limitations under the License.
 *
 * Copyright (C) 2008 Ola Bini <ola.bini@gmail.com>
 * 
 * Alternatively, the contents of this file may be used under the terms of
 * either of the GNU General Public License Version 2 or later (the "GPL"),
 * or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
 * in which case the provisions of the GPL or the LGPL are applicable instead
 * of those above. If you wish to allow use of your version of this file only
 * under the terms of either the GPL or the LGPL, and not to allow others to
 * use your version of this file under the terms of the EPL, indicate your
 * decision by deleting the provisions above and replace them with the notice
 * and other provisions required by the GPL or the LGPL. If you do not delete
 * the provisions above, a recipient may use your version of this file under
 * the terms of any one of the EPL, the GPL or the LGPL.
 ***** END LICENSE BLOCK *****/

package org.jruby.ext.socket;


import jnr.unixsocket.UnixServerSocketChannel;
import jnr.unixsocket.UnixSocketAddress;
import jnr.unixsocket.UnixSocketChannel;
import org.jruby.Ruby;
import org.jruby.RubyClass;
import org.jruby.anno.JRubyClass;
import org.jruby.anno.JRubyMethod;
import org.jruby.runtime.Helpers;
import org.jruby.runtime.ObjectAllocator;
import org.jruby.runtime.ThreadContext;
import org.jruby.runtime.Visibility;
import org.jruby.runtime.builtin.IRubyObject;

import java.io.IOException;
import java.net.SocketAddress;
import java.nio.channels.SelectableChannel;
import java.nio.channels.SelectionKey;

@JRubyClass(name="UNIXServer", parent="UNIXSocket")
public class RubyUNIXServer extends RubyUNIXSocket {
    private static ObjectAllocator UNIXSERVER_ALLOCATOR = new ObjectAllocator() {
        public IRubyObject allocate(Ruby runtime, RubyClass klass) {
            return new RubyUNIXServer(runtime, klass);
        }
    };

    static void createUNIXServer(Ruby runtime) {
        RubyClass rb_cUNIXServer = runtime.defineClass("UNIXServer", runtime.getClass("UNIXSocket"), UNIXSERVER_ALLOCATOR);

        runtime.getObject().setConstant("UNIXserver", rb_cUNIXServer);
        
        rb_cUNIXServer.defineAnnotatedMethods(RubyUNIXServer.class);
    }

    public RubyUNIXServer(Ruby runtime, RubyClass type) {
        super(runtime, type);
    }

    @JRubyMethod(visibility = Visibility.PRIVATE)
    public IRubyObject initialize(ThreadContext context, IRubyObject path) {
        init_unixsock(context.runtime, path, true);

        return this;
    }

    @JRubyMethod
    public IRubyObject accept(ThreadContext context) {
        Ruby runtime = context.runtime;

        try {

            while (true) { // select loop to allow interrupting
                boolean ready = context.getThread().select(this, SelectionKey.OP_ACCEPT);

                if (!ready) {
                    // we were woken up without being selected...poll for thread events and go back to sleep
                    context.pollThreadEvents();

                } else {
                    UnixSocketChannel socketChannel = asUnixServer().accept();

                    RubyUNIXSocket sock = (RubyUNIXSocket)(Helpers.invoke(context, runtime.getClass("UNIXSocket"), "allocate"));

                    sock.init_sock(context.runtime, socketChannel, "");

                    return sock;
                }
            }

        } catch (IOException ioe) {
            throw context.runtime.newIOErrorFromException(ioe);
        }
    }

    @JRubyMethod
    public IRubyObject accept_nonblock(ThreadContext context) {
        return accept_nonblock(context, context.runtime, true);
    }

    @JRubyMethod
    public IRubyObject accept_nonblock(ThreadContext context, IRubyObject opts) {
        return accept_nonblock(context, context.runtime, extractExceptionArg(context, opts));
    }

    public IRubyObject accept_nonblock(ThreadContext context, Ruby runtime, boolean ex) {
        SelectableChannel selectable = (SelectableChannel)getChannel();

        synchronized (selectable.blockingLock()) {
            boolean oldBlocking = selectable.isBlocking();

            try {
                selectable.configureBlocking(false);

                try {
                    UnixSocketChannel socketChannel = ((UnixServerSocketChannel) selectable).accept();

                    if (socketChannel == null) {
                        if (!ex) return runtime.newSymbol("wait_readable");
                        throw runtime.newErrnoEAGAINReadableError("accept(2) would block");
                    }

                    RubyUNIXSocket sock = (RubyUNIXSocket)(Helpers.invoke(context, runtime.getClass("UNIXSocket"), "allocate"));

                    sock.init_sock(context.runtime, socketChannel, "");

                    return sock;

                } finally {
                    selectable.configureBlocking(oldBlocking);
                }

            } catch (IOException ioe) {
                if (ioe.getMessage().equals("accept failed: Resource temporarily unavailable")) {
                    if (!ex) return runtime.newSymbol("wait_readable");
                    throw runtime.newErrnoEAGAINReadableError("accept");
                }

                throw context.runtime.newIOErrorFromException(ioe);
            }
        }
    }

    @JRubyMethod
    public IRubyObject listen(ThreadContext context, IRubyObject log) {
        // TODO listen backlog
        return context.runtime.newFixnum(0);
    }

    @JRubyMethod
    public IRubyObject sysaccept(ThreadContext context) {
        RubyUNIXSocket socket = (RubyUNIXSocket) accept(context);
        return context.runtime.newFixnum(((UnixSocketChannel) socket.getChannel()).getFD());
    }

    @JRubyMethod
    public IRubyObject path(ThreadContext context) {
        return context.runtime.newString(openFile.getPath());
    }

    @JRubyMethod
    public IRubyObject addr(ThreadContext context) {
        Ruby runtime = context.runtime;

        return runtime.newArray(
                runtime.newString("AF_UNIX"),
                runtime.newString(openFile.getPath()));
    }

    @JRubyMethod
    public IRubyObject peeraddr(ThreadContext context) {
        throw context.runtime.newErrnoENOTCONNError();
    }

    @Override
    protected UnixSocketAddress getUnixSocketAddress() {
        SocketAddress socketAddress = ((UnixServerSocketChannel)getChannel()).getLocalSocketAddress();
        if (socketAddress instanceof UnixSocketAddress) return (UnixSocketAddress) socketAddress;
        return null;
    }

    @Override
    protected UnixSocketAddress getUnixRemoteSocket() {
        SocketAddress socketAddress = ((UnixServerSocketChannel)getChannel()).getLocalSocketAddress();
        if (socketAddress instanceof UnixSocketAddress) return (UnixSocketAddress) socketAddress;
        return null;
    }

    private UnixServerSocketChannel asUnixServer() {
        return (UnixServerSocketChannel)getChannel();
    }
}// RubyUNIXServer