/** Selects on sockets and informs their Communicator when there is something to do. */
public void communicate(int timeout) {
try {
selector.select(timeout);
} catch (IOException e) {
// Not really sure why/when this happens yet
return;
}
Iterator<SelectionKey> keys = selector.selectedKeys().iterator();
while (keys.hasNext()) {
SelectionKey key = keys.next();
keys.remove();
if (!key.isValid()) continue; // WHY
Communicator communicator = (Communicator) key.attachment();
if (key.isReadable()) communicator.onReadable();
if (key.isWritable()) communicator.onWritable();
if (key.isAcceptable()) communicator.onAcceptable();
}
// Go through the queue and handle each communicator
while (!queue.isEmpty()) {
Communicator c = queue.poll();
c.onMemo();
}
}
/**
* Serves the incoming connections.
*
* @throws IOException
* @throws DirectoryException
*/
private void serveIncomingConnections() throws IOException, DirectoryException {
int selectorState = selector.select();
// We can't rely on return value of select to determine if any keys
// are ready.
// see http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=4850373
for (Iterator<SelectionKey> iterator = selector.selectedKeys().iterator();
iterator.hasNext(); ) {
SelectionKey key = iterator.next();
iterator.remove();
if (key.isAcceptable()) {
// Accept the new client connection.
ServerSocketChannel serverChannel = (ServerSocketChannel) key.channel();
SocketChannel clientChannel = serverChannel.accept();
if (clientChannel != null) {
acceptConnection(clientChannel);
}
}
if (selectorState == 0 && enabled && !shutdownRequested && logger.isTraceEnabled()) {
// Selected keys was non empty but select() returned 0.
// Log warning and hope it blocks on the next select() call.
logger.trace(
"Selector.select() returned 0. "
+ "Selected Keys: %d, Interest Ops: %d, Ready Ops: %d ",
selector.selectedKeys().size(), key.interestOps(), key.readyOps());
}
}
}
/**
* Vorbedingung: variante und selectors sind ungleich null. selectors enthaelt keine Elemente
* gleich null
*
* @param variante
* @return true, wenn alle Selektoren die Variante selektieren, false anderenfalls.
*/
private boolean select(Variante variante, List<Selector<Variante>> selectors) {
for (Selector<Variante> selector : selectors) {
if (!selector.select(variante)) {
return false;
}
}
return true;
}
private void dispatch() throws IOException {
sel.select();
for (Iterator i = sel.selectedKeys().iterator(); i.hasNext(); ) {
SelectionKey sk = (SelectionKey) i.next();
i.remove();
Handler h = (Handler) sk.attachment();
h.handle(sk);
}
}
protected Selectable select(Selector selector, List<String> strings) {
List<String> results = new ArrayList<String>();
for (String string : strings) {
String result = selector.select(string);
if (result != null) {
results.add(result);
}
}
return new PlainText(results);
}
/**
* Prepare NIO objects and start processing looping in current thread. Never exit unless abortion
* because of exception.
*/
public void startService() {
try {
prepareNioObjects();
while (selector.select() > 0) {
frameProcess();
}
} catch (IOException e) {
e.printStackTrace();
}
}
@Override
public String select(String text) {
for (Selector selector : selectors) {
if (text == null) {
return null;
}
text = selector.select(text);
}
return text;
}
static void test() throws Exception {
ServerSocketChannel ssc = null;
SocketChannel sc = null;
SocketChannel peer = null;
try {
ssc = ServerSocketChannel.open().bind(new InetSocketAddress(0));
// loopback connection
InetAddress lh = InetAddress.getLocalHost();
sc = SocketChannel.open(new InetSocketAddress(lh, ssc.socket().getLocalPort()));
peer = ssc.accept();
// peer sends message so that "sc" will be readable
int n = peer.write(ByteBuffer.wrap("Hello".getBytes()));
assert n > 0;
sc.configureBlocking(false);
Selector selector = Selector.open();
SelectionKey key = sc.register(selector, SelectionKey.OP_READ | SelectionKey.OP_WRITE);
boolean done = false;
int failCount = 0;
while (!done) {
int nSelected = selector.select();
if (nSelected > 0) {
if (nSelected > 1) throw new RuntimeException("More than one channel selected");
Set<SelectionKey> keys = selector.selectedKeys();
Iterator<SelectionKey> iterator = keys.iterator();
while (iterator.hasNext()) {
key = iterator.next();
iterator.remove();
if (key.isWritable()) {
failCount++;
if (failCount > 10) throw new RuntimeException("Test failed");
Thread.sleep(250);
}
if (key.isReadable()) {
done = true;
}
}
}
}
} finally {
if (peer != null) peer.close();
if (sc != null) sc.close();
if (ssc != null) ssc.close();
}
}
public void run() {
for (; ; ) {
try {
int n = sel.select();
if (n > 0) processSelectedKeys();
processPendingTargets();
if (shutdown) {
sel.close();
return;
}
} catch (IOException x) {
x.printStackTrace();
}
}
}
public Vector<Chromosome> callSelector(Vector<Chromosome> from, int num) {
Vector<Chromosome> result = null;
if (selector != null) {
result = selector.select(from, num);
} else {
result = from;
}
last_population = new Vector<Chromosome>();
for (Chromosome chrom : result) {
last_population.add(chrom);
}
return result;
}
public void run() {
try {
SocketChannel sc = SocketChannel.open();
InetSocketAddress sinaAddr = new InetSocketAddress("sina.com", 80);
sc.socket().connect(sinaAddr);
// init a selector via helper class selector provider
Selector aSel = SelectorProvider.provider().openSelector();
Socket soc = new Socket("host", 80);
soc.getChannel().register(aSel, SelectionKey.OP_ACCEPT);
// init a channel for server socket. method 1
ServerSocketChannel ssc = ServerSocketChannel.open();
ssc.configureBlocking(true);
// method 2, get server socket first, then init its channel
ServerSocket ss = new ServerSocket();
ServerSocketChannel ssc2 = ss.getChannel();
// set socket channel as non blocking.
ssc.configureBlocking(false);
InetSocketAddress isa = new InetSocketAddress("localhost", 9999);
ssc.socket().bind(isa);
SelectionKey acceptKey = ssc.register(aSel, SelectionKey.OP_ACCEPT);
int keysAdded = 0;
while ((keysAdded = aSel.select()) > 0) {
Set readyKeys = aSel.selectedKeys();
Iterator i = readyKeys.iterator();
while (i.hasNext()) {
SelectionKey sk = (SelectionKey) i.next();
i.remove();
ServerSocketChannel n = (ServerSocketChannel) sk.channel();
// now we got a new socket and its channel after accept in server
Socket s = n.accept().socket();
SocketChannel socketChannel = s.getChannel();
socketChannel.register(aSel, SelectionKey.OP_READ);
}
}
} catch (Exception e) {
}
}
void checkIO() {
long timeout;
if (NewConnections.size() > 0) {
timeout = -1;
} else if (!Timers.isEmpty()) {
long now = new Date().getTime();
long k = Timers.firstKey();
long diff = k - now;
if (diff <= 0) timeout = -1; // don't wait, just poll once
else timeout = diff;
} else {
timeout = 0; // wait indefinitely
}
try {
if (timeout == -1) mySelector.selectNow();
else mySelector.select(timeout);
} catch (IOException e) {
e.printStackTrace();
}
}
private void go() throws IOException {
// Create a new selector
Selector selector = Selector.open();
// Open a listener on each port, and register each one
// with the selector
for (int i = 0; i < ports.length; ++i) {
ServerSocketChannel ssc = ServerSocketChannel.open();
ssc.configureBlocking(false);
ServerSocket ss = ssc.socket();
InetSocketAddress address = new InetSocketAddress(ports[i]);
ss.bind(address);
SelectionKey key = ssc.register(selector, SelectionKey.OP_ACCEPT);
System.out.println("Going to listen on " + ports[i]);
}
while (true) {
int num = selector.select();
Set selectedKeys = selector.selectedKeys();
Iterator it = selectedKeys.iterator();
while (it.hasNext()) {
SelectionKey key = (SelectionKey) it.next();
if ((key.readyOps() & SelectionKey.OP_ACCEPT) == SelectionKey.OP_ACCEPT) {
// Accept the new connection
ServerSocketChannel ssc = (ServerSocketChannel) key.channel();
SocketChannel sc = ssc.accept();
sc.configureBlocking(false);
// Add the new connection to the selector
SelectionKey newKey = sc.register(selector, SelectionKey.OP_READ);
it.remove();
System.out.println("Got connection from " + sc);
} else if ((key.readyOps() & SelectionKey.OP_READ) == SelectionKey.OP_READ) {
// Read the data
SocketChannel sc = (SocketChannel) key.channel();
// Echo data
int bytesEchoed = 0;
while (true) {
echoBuffer.clear();
int r = sc.read(echoBuffer);
if (r <= 0) {
break;
}
echoBuffer.flip();
sc.write(echoBuffer);
bytesEchoed += r;
}
System.out.println("Echoed " + bytesEchoed + " from " + sc);
it.remove();
}
}
// System.out.println( "going to clear" );
// selectedKeys.clear();
// System.out.println( "cleared" );
}
}
public void run() {
// Here's where everything happens. The select method will
// return when any operations registered above have occurred, the
// thread has been interrupted, etc.
try {
while (!stop) {
try {
if (selector.select() > 0) {
if (stop) {
break;
}
// Someone is ready for I/O, get the ready keys
Set readyKeys = selector.selectedKeys();
Iterator it = readyKeys.iterator();
// Walk through the ready keys collection and process date requests.
while (it.hasNext()) {
SelectionKey sk = (SelectionKey) it.next();
it.remove();
SocketChannel readChannel = null;
TcpAddress incomingAddress = null;
if (sk.isAcceptable()) {
// The key indexes into the selector so you
// can retrieve the socket that's ready for I/O
ServerSocketChannel nextReady = (ServerSocketChannel) sk.channel();
// Accept the date request and send back the date string
Socket s = nextReady.accept().socket();
readChannel = s.getChannel();
readChannel.configureBlocking(false);
readChannel.register(selector, SelectionKey.OP_READ);
incomingAddress = new TcpAddress(s.getInetAddress(), s.getPort());
SocketEntry entry = new SocketEntry(incomingAddress, s);
sockets.put(incomingAddress, entry);
timeoutSocket(entry);
TransportStateEvent e =
new TransportStateEvent(
DefaultTcpTransportMapping.this,
incomingAddress,
TransportStateEvent.STATE_CONNECTED,
null);
fireConnectionStateChanged(e);
} else if (sk.isReadable()) {
readChannel = (SocketChannel) sk.channel();
incomingAddress =
new TcpAddress(
readChannel.socket().getInetAddress(), readChannel.socket().getPort());
} else if (sk.isWritable()) {
try {
SocketEntry entry = (SocketEntry) sk.attachment();
SocketChannel sc = (SocketChannel) sk.channel();
if (entry != null) {
writeMessage(entry, sc);
}
} catch (IOException iox) {
if (logger.isDebugEnabled()) {
iox.printStackTrace();
}
logger.warn(iox);
TransportStateEvent e =
new TransportStateEvent(
DefaultTcpTransportMapping.this,
incomingAddress,
TransportStateEvent.STATE_DISCONNECTED_REMOTELY,
iox);
fireConnectionStateChanged(e);
sk.cancel();
}
} else if (sk.isConnectable()) {
try {
SocketEntry entry = (SocketEntry) sk.attachment();
SocketChannel sc = (SocketChannel) sk.channel();
if ((!sc.isConnected()) && (sc.finishConnect())) {
sc.configureBlocking(false);
logger.debug("Connected to " + entry.getPeerAddress());
// make sure conncetion is closed if not used for timeout
// micro seconds
timeoutSocket(entry);
sc.register(selector, SelectionKey.OP_WRITE, entry);
}
TransportStateEvent e =
new TransportStateEvent(
DefaultTcpTransportMapping.this,
incomingAddress,
TransportStateEvent.STATE_CONNECTED,
null);
fireConnectionStateChanged(e);
} catch (IOException iox) {
if (logger.isDebugEnabled()) {
iox.printStackTrace();
}
logger.warn(iox);
sk.cancel();
}
}
if (readChannel != null) {
try {
readMessage(sk, readChannel, incomingAddress);
} catch (IOException iox) {
// IO exception -> channel closed remotely
if (logger.isDebugEnabled()) {
iox.printStackTrace();
}
logger.warn(iox);
sk.cancel();
readChannel.close();
TransportStateEvent e =
new TransportStateEvent(
DefaultTcpTransportMapping.this,
incomingAddress,
TransportStateEvent.STATE_DISCONNECTED_REMOTELY,
iox);
fireConnectionStateChanged(e);
}
}
}
}
} catch (NullPointerException npex) {
// There seems to happen a NullPointerException within the select()
npex.printStackTrace();
logger.warn("NullPointerException within select()?");
}
processPending();
}
if (ssc != null) {
ssc.close();
}
} catch (IOException iox) {
logger.error(iox);
lastError = iox;
}
if (!stop) {
stop = true;
synchronized (DefaultTcpTransportMapping.this) {
server = null;
}
}
}
/**
* Find elements that match the {@link Selector} CSS query, with this element as the starting
* context. Matched elements may include this element, or any of its children.
*
* <p>This method is generally more powerful to use than the DOM-type {@code getElementBy*}
* methods, because multiple filters can be combined, e.g.:
*
* <ul>
* <li>{@code el.select("a[href]")} - finds links ({@code a} tags with {@code href} attributes)
* <li>{@code el.select("a[href*=example.com]")} - finds links pointing to example.com (loosely)
* </ul>
*
* <p>See the query syntax documentation in {@link org.jsoup.select.Selector}.
*
* @param cssQuery a {@link Selector} CSS-like query
* @return elements that match the query (empty if none match)
* @see org.jsoup.select.Selector
*/
public Elements select(String cssQuery) {
return Selector.select(cssQuery, this);
}
public void init() throws IOException {
this._logger = LoggerFactory.getLogger(AcquirePort.class);
selector = Selector.open();
// 通过open方法来打开一个未绑定的ServerSocketChannel实例
ServerSocketChannel server = ServerSocketChannel.open();
InetSocketAddress isa = new InetSocketAddress(_acquirePort);
// 将该ServerSocketChannel绑定到指定IP地址
server.socket().bind(isa);
// 设置ServerSocket以非阻塞方式工作
server.configureBlocking(false);
// 将server注册到指定Selector对象
server.register(selector, SelectionKey.OP_ACCEPT);
// 定义准备执行读取数据的ByteBuffer
ByteBuffer buff = ByteBuffer.allocate(1024);
while (selector.select() > 0) {
// 依次处理selector上的每个已选择的SelectionKey
Set<SelectionKey> sks = selector.selectedKeys();
Iterator keys = sks.iterator();
while (keys.hasNext()) {
SelectionKey sk = (SelectionKey) keys.next();
// 从selector上的已选择Key集中删除正在处理的SelectionKey
keys.remove();
// 如果sk对应的通道包含客户端的连接请求
if (sk.isAcceptable()) {
// 调用accept方法接受连接，产生服务器端对应的SocketChannel
SocketChannel sc = server.accept();
// 设置采用非阻塞模式
sc.configureBlocking(false);
// 将该SocketChannel也注册到selector
sc.register(selector, SelectionKey.OP_READ);
}
// 如果sk对应的通道有数据需要读取
if (sk.isReadable()) {
// 获取该SelectionKey对应的Channel，该Channel中有可读的数据
SocketChannel sc = (SocketChannel) sk.channel();
// 开始读取数据
try {
while (sc.read(buff) > 0) {
buff.flip();
this._logger.info("content" + buff);
sc.write(buff);
if (buff.hasRemaining()) {
buff.compact();
} else {
buff.clear();
}
}
// 打印从该sk对应的Channel里读取到的数据
this._logger.info("accpect content" + buff);
}
// 如果捕捉到该sk对应的Channel出现了异常，即表明该Channel
// 对应的Client出现了问题，所以从Selector中取消sk的注册
catch (IOException ex) {
// 从Selector中删除指定的SelectionKey
sk.cancel();
if (sk.channel() != null) {
sk.channel().close();
}
}
}
}
}
}
