/*
* Copyright (C) 2008 Wayne Meissner
*
* This file is part of the JNR project.
*
* Licensed 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
*
* http://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 jnr.enxio.example;
import jnr.enxio.channels.NativeSelectableChannel;
import jnr.enxio.channels.NativeSelectorProvider;
import jnr.enxio.channels.NativeServerSocketChannel;
import jnr.enxio.channels.NativeSocketChannel;
import jnr.ffi.*;
import jnr.ffi.annotations.In;
import jnr.ffi.annotations.Out;
import jnr.ffi.types.size_t;
import jnr.ffi.types.ssize_t;
import java.io.IOException;
import java.nio.ByteBuffer;
import java.nio.channels.SelectableChannel;
import java.nio.channels.SelectionKey;
import java.nio.channels.Selector;
/**
*
* @author wayne
*/
public class TCPServer {
static final String[] libnames = Platform.getNativePlatform().getOS() == Platform.OS.SOLARIS
? new String[] { "socket", "nsl", "c" }
: new String[] { "c" };
static final LibC libc = Library.loadLibrary(LibC.class, libnames);
static final jnr.ffi.Runtime runtime = jnr.ffi.Runtime.getSystemRuntime();
public static class SockAddr extends Struct {
public SockAddr() {
super(runtime);
}
}
static class BSDSockAddrIN extends SockAddr {
public final Unsigned8 sin_len = new Unsigned8();
public final Unsigned8 sin_family = new Unsigned8();
public final Unsigned16 sin_port = new Unsigned16();
public final Unsigned32 sin_addr = new Unsigned32();
public final Padding sin_zero = new Padding(NativeType.SCHAR, 8);
}
static class SockAddrIN extends SockAddr {
public final Unsigned16 sin_family = new Unsigned16();
public final Unsigned16 sin_port = new Unsigned16();
public final Unsigned32 sin_addr = new Unsigned32();
public final Padding sin_zero = new Padding(NativeType.SCHAR, 8);
}
public static interface LibC {
static final int AF_INET = jnr.constants.platform.AddressFamily.AF_INET.intValue();
static final int SOCK_STREAM = jnr.constants.platform.Sock.SOCK_STREAM.intValue();
int socket(int domain, int type, int protocol);
int close(int fd);
int listen(int fd, int backlog);
int bind(int fd, SockAddr addr, int len);
int accept(int fd, @Out SockAddr addr, int[] len);
@ssize_t int read(int fd, @Out ByteBuffer data, @size_t int len);
@ssize_t int read(int fd, @Out byte[] data, @size_t int len);
@ssize_t int write(int fd, @In ByteBuffer data, @size_t int len);
String strerror(int error);
}
static short htons(short val) {
return Short.reverseBytes(val);
}
static NativeServerSocketChannel serverSocket(int port) {
int fd = libc.socket(LibC.AF_INET, LibC.SOCK_STREAM, 0);
System.out.println("fd=" + fd);
SockAddr addr;
if (Platform.getNativePlatform().isBSD()) {
BSDSockAddrIN sin = new BSDSockAddrIN();
sin.sin_family.set((byte) LibC.AF_INET);
sin.sin_port.set(htons((short) port));
addr = sin;
} else {
SockAddrIN sin = new SockAddrIN();
sin.sin_family.set(htons((short) LibC.AF_INET));
sin.sin_port.set(htons((short) port));
addr = sin;
}
System.out.println("sizeof addr=" + Struct.size(addr));
if (libc.bind(fd, addr, Struct.size(addr)) < 0) {
System.err.println("bind failed: " + libc.strerror(LastError.getLastError(runtime)));
System.exit(1);
}
if (libc.listen(fd, 5) < 0) {
System.err.println("listen failed: " + libc.strerror(LastError.getLastError(runtime)));
System.exit(1);
}
System.out.println("bind+listen succeeded");
return new NativeServerSocketChannel(fd);
}
private static abstract class IO {
protected final SelectableChannel channel;
protected final Selector selector;
public IO(Selector selector, SelectableChannel ch) {
this.selector = selector;
this.channel = ch;
}
public abstract void read();
public abstract void write();
}
private static class Accepter extends IO {
public Accepter(Selector selector, NativeServerSocketChannel ch) {
super(selector, ch);
}
public void read() {
SockAddrIN sin = new SockAddrIN();
int[] addrSize = { Struct.size(sin) };
int clientfd = libc.accept(((NativeSelectableChannel) channel).getFD(), sin, addrSize);
System.out.println("client fd = " + clientfd);
NativeSocketChannel ch = new NativeSocketChannel(clientfd);
try {
ch.configureBlocking(false);
ch.register(selector, SelectionKey.OP_READ, new Client(selector, ch));
selector.wakeup();
} catch (IOException ex) {}
}
public void write() {
SelectionKey k = channel.keyFor(selector);
k.interestOps(SelectionKey.OP_ACCEPT);
}
}
private static class Client extends IO {
private final ByteBuffer buf = ByteBuffer.allocateDirect(1024);
public Client(Selector selector, NativeSocketChannel ch) {
super(selector, ch);
}
public void read() {
int n = libc.read(((NativeSelectableChannel) channel).getFD(), buf, buf.remaining());
System.out.println("Read " + n + " bytes from client");
if (n <= 0) {
SelectionKey k = channel.keyFor(selector);
k.cancel();
libc.close(((NativeSelectableChannel) channel).getFD());
return;
}
buf.position(n);
buf.flip();
channel.keyFor(selector).interestOps(SelectionKey.OP_WRITE);
}
public void write() {
while (buf.hasRemaining()) {
int n = libc.write(((NativeSelectableChannel) channel).getFD(), buf, buf.remaining());
System.out.println("write returned " + n);
if (n > 0) {
buf.position(buf.position() + n);
}
if (n == 0) {
return;
}
if (n < 0) {
channel.keyFor(selector).cancel();
libc.close(((NativeSelectableChannel) channel).getFD());
return;
}
}
System.out.println("outbuf empty");
buf.clear();
channel.keyFor(selector).interestOps(SelectionKey.OP_READ);
}
}
public static void main(String[] args) {
short baseport = 2000;
try {
Selector selector = NativeSelectorProvider.getInstance().openSelector();
for (int i = 0; i < 2; ++i) {
NativeServerSocketChannel ch = serverSocket(baseport + i);
ch.configureBlocking(false);
ch.register(selector, SelectionKey.OP_ACCEPT, new Accepter(selector, ch));
}
while (true) {
selector.select();
for (SelectionKey k : selector.selectedKeys()) {
if ((k.readyOps() & (SelectionKey.OP_READ | SelectionKey.OP_ACCEPT)) != 0) {
((IO) k.attachment()).read();
}
if ((k.readyOps() & (SelectionKey.OP_WRITE | SelectionKey.OP_CONNECT)) != 0) {
((IO) k.attachment()).write();
}
}
}
} catch (IOException ex) {
}
}
}