Java Code Examples for java.nio.channels.Selector#selectedKeys()
The following examples show how to use
java.nio.channels.Selector#selectedKeys() .
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Example 1
| Source File: NIOAcceptor.java From Mycat-NIO with Apache License 2.0 | 6 votes |
|
@Override
public void run() {
final Selector selector = this.selector;
for (;;) {
++acceptCount;
try {
selector.select(1000L);
Set<SelectionKey> keys = selector.selectedKeys();
try {
for (SelectionKey key : keys) {
if (key.isValid() && key.isAcceptable()) {
accept();
} else {
key.cancel();
}
}
} finally {
keys.clear();
}
} catch (Throwable e) {
LOGGER.warn(getName(), e);
}
}
}
Example 2
| Source File: NIOConnector.java From heisenberg with Apache License 2.0 | 6 votes |
|
@Override
public void run() {
final Selector selector = this.selector;
for (;;) {
++connectCount;
try {
selector.select(1000L);
connect(selector);
Set<SelectionKey> keys = selector.selectedKeys();
try {
for (SelectionKey key : keys) {
Object att = key.attachment();
if (att != null && key.isValid() && key.isConnectable()) {
finishConnect(key, att);
} else {
key.cancel();
}
}
} finally {
keys.clear();
}
} catch (Throwable e) {
LOGGER.warn(name, e);
}
}
}
Example 3
| Source File: NIOConnector.java From tddl5 with Apache License 2.0 | 6 votes |
|
@Override
public void run() {
final Selector selector = this.selector;
for (;;) {
++connectCount;
try {
selector.select(1000L);
connect(selector);
Set<SelectionKey> keys = selector.selectedKeys();
try {
for (SelectionKey key : keys) {
Object att = key.attachment();
if (att != null && key.isValid() && key.isConnectable()) {
finishConnect(key, att);
} else {
key.cancel();
}
}
} finally {
keys.clear();
}
} catch (Throwable e) {
logger.warn(name, e);
}
}
}
Example 4
| Source File: TCPNIOAcceptor.java From Mycat-JCache with GNU General Public License v2.0 | 6 votes |
|
@Override
public void run() {
final Selector selector = this.selector;
for (; ; ) {
try {
selector.select(500L);
Set<SelectionKey> keys = selector.selectedKeys();
try {
keys.forEach(this::handleKey);
} finally {
keys.clear();
}
} catch (Throwable e) {
logger.warn(getName(), e);
}
}
}
Example 5
| Source File: NIOAcceptor.java From feeyo-redisproxy with BSD 3-Clause "New" or "Revised" License | 6 votes |
|
@Override
public void run() {
final Selector selector = this.selector;
for (;;) {
++acceptCount;
try {
selector.select( 1000L );
Set<SelectionKey> keys = selector.selectedKeys();
try {
for (SelectionKey key : keys) {
if (key.isValid() && key.isAcceptable()) {
accept();
} else {
key.cancel();
}
}
} finally {
keys.clear();
}
} catch (Throwable e) {
LOGGER.warn(getName(), e);
}
}
}
Example 6
| Source File: NIOConnector.java From feeyo-redisproxy with BSD 3-Clause "New" or "Revised" License | 5 votes |
|
@Override
public void run() {
final Selector selector = this.selector;
for (;;) {
++connectCount;
try {
//查看有无连接就绪
selector.select( 1000L );
connect(selector);
Set<SelectionKey> keys = selector.selectedKeys();
try {
for (SelectionKey key: keys) {
Object att = key.attachment();
if (att != null && key.isValid() && key.isConnectable()) {
finishConnect(key, att);
} else {
key.cancel();
}
}
} finally {
keys.clear();
}
} catch (Exception e) {
LOGGER.warn(name, e);
}
}
}
Example 7
| Source File: EchoServer.java From tutorials with MIT License | 5 votes |
|
public static void main(String[] args) throws IOException {
Selector selector = Selector.open();
ServerSocketChannel serverSocket = ServerSocketChannel.open();
serverSocket.bind(new InetSocketAddress("localhost", 5454));
serverSocket.configureBlocking(false);
serverSocket.register(selector, SelectionKey.OP_ACCEPT);
ByteBuffer buffer = ByteBuffer.allocate(256);
while (true) {
selector.select();
Set<SelectionKey> selectedKeys = selector.selectedKeys();
Iterator<SelectionKey> iter = selectedKeys.iterator();
while (iter.hasNext()) {
SelectionKey key = iter.next();
if (key.isAcceptable()) {
register(selector, serverSocket);
}
if (key.isReadable()) {
answerWithEcho(buffer, key);
}
iter.remove();
}
}
}
Example 8
| Source File: NIOReactor.java From Mycat-JCache with GNU General Public License v2.0 | 5 votes |
|
@Override
public void run() {
final Selector selector = this.selector;
Set<SelectionKey> keys = null;
int readys=0;
for (;;) {
try {
// 400/(readys+1)
readys=selector.select(400); //借鉴mycat-core
if(readys==0) // 没有需要处理的事件时，处理新连接请求 注册 read 事件
{
handlerEvents(selector);
continue;
}
keys = selector.selectedKeys();
for(SelectionKey key:keys)
{
Connection con = (Connection)key.attachment();
logger.info("select-key-readyOps = {}, attachment = {}", key.readyOps(), con);
// JcacheContext.getExecutor().execute(con);
con.run();
}
} catch (Throwable e) {
logger.warn(getName(), e);
} finally {
if (keys != null) {
keys.clear();
}
}
handlerEvents(selector); //处理完成事件后,处理新里连接请求 注册 read 事件
}
}
Example 9
| Source File: NIOConnector.java From Mycat-NIO with Apache License 2.0 | 5 votes |
|
@Override
public void run() {
final Selector selector = this.selector;
for (;;) {
++connectCount;
try {
selector.select(1000L);
connect(selector);
Set<SelectionKey> keys = selector.selectedKeys();
try {
for (SelectionKey key : keys) {
Object att = key.attachment();
if (att != null && key.isValid() && key.isConnectable()) {
finishConnect(key, att);
} else {
key.cancel();
}
}
} finally {
keys.clear();
}
} catch (Throwable e) {
LOGGER.warn(name, e);
}
}
}
Example 10
| Source File: NIOReactor.java From heisenberg with Apache License 2.0 | 5 votes |
|
@Override
public void run() {
final Selector selector = this.selector;
for (;;) {
++reactCount;
try {
selector.select(1000L);
register(selector);
Set<SelectionKey> keys = selector.selectedKeys();
try {
for (SelectionKey key : keys) {
Object att = key.attachment();
if (att != null && key.isValid()) {
int readyOps = key.readyOps();
if ((readyOps & SelectionKey.OP_READ) != 0) {
read((NIOConnection) att);
} else if ((readyOps & SelectionKey.OP_WRITE) != 0) {
write((NIOConnection) att);
} else {
key.cancel();
}
} else {
key.cancel();
}
}
} finally {
keys.clear();
}
} catch (Throwable e) {
LOGGER.warn(name, e);
}
}
}
Example 11
| Source File: EchoNIOServer.java From JavaBase with MIT License | 5 votes |
|
public void start() throws IOException {
Selector selector = Selector.open();
//通过OPEN方法来打开一个未绑定的ServerSocketChannel 实例
ServerSocketChannel server = ServerSocketChannel.open();
//将该ServerSocketChannel绑定到指定ip
server.bind(new InetSocketAddress(NIOServer.PORT));
//设置是NIO 非阻塞模式
server.configureBlocking(false);
//将sever注册到指定Selector对象上
server.register(selector, SelectionKey.OP_ACCEPT);
while (!stop) {
selector.select(2000);
Set<SelectionKey> selectedKeys = selector.selectedKeys();
Iterator<SelectionKey> it = selectedKeys.iterator();
SelectionKey key;
while (it.hasNext()) {
key = it.next();
it.remove();
try {
handleInput(selector, key);
} catch (Exception e) {
if (key != null) {
key.cancel();
if (key.channel() != null) {
key.channel().close();
}
}
}
}
}
}
Example 12
| Source File: NIOReactor.java From tddl5 with Apache License 2.0 | 5 votes |
|
@Override
public void run() {
final Selector selector = this.selector;
for (;;) {
++reactCount;
try {
selector.select(1000L);
register(selector);
Set<SelectionKey> keys = selector.selectedKeys();
try {
for (SelectionKey key : keys) {
Object att = key.attachment();
if (att != null && key.isValid()) {
int readyOps = key.readyOps();
if ((readyOps & SelectionKey.OP_READ) != 0) {
read((NIOConnection) att);
} else if ((readyOps & SelectionKey.OP_WRITE) != 0) {
write((NIOConnection) att);
} else {
key.cancel();
}
} else {
key.cancel();
}
}
} finally {
keys.clear();
}
} catch (Throwable e) {
logger.warn(name, e);
}
}
}
Example 13
| Source File: AbstractNioWorker.java From android-netty with Apache License 2.0 | 5 votes |
|
@Override
protected void process(Selector selector) throws IOException {
Set<SelectionKey> selectedKeys = selector.selectedKeys();
// check if the set is empty and if so just return to not create garbage by
// creating a new Iterator every time even if there is nothing to process.
// See https://github.com/netty/netty/issues/597
if (selectedKeys.isEmpty()) {
return;
}
for (Iterator<SelectionKey> i = selectedKeys.iterator(); i.hasNext();) {
SelectionKey k = i.next();
i.remove();
try {
int readyOps = k.readyOps();
if ((readyOps & SelectionKey.OP_READ) != 0 || readyOps == 0) {
if (!read(k)) {
// Connection already closed - no need to handle write.
continue;
}
}
if ((readyOps & SelectionKey.OP_WRITE) != 0) {
writeFromSelectorLoop(k);
}
} catch (CancelledKeyException e) {
close(k);
}
if (cleanUpCancelledKeys()) {
break; // break the loop to avoid ConcurrentModificationException
}
}
}
Example 14
| Source File: AbstractNioWorker.java From simple-netty-source with Apache License 2.0 | 5 votes |
|
@Override
protected void process(Selector selector) throws IOException {
Set<SelectionKey> selectedKeys = selector.selectedKeys();
// check if the set is empty and if so just return to not create garbage by
// creating a new Iterator every time even if there is nothing to process.
// See https://github.com/netty/netty/issues/597
if (selectedKeys.isEmpty()) {
return;
}
for (Iterator<SelectionKey> i = selectedKeys.iterator(); i.hasNext();) {
SelectionKey k = i.next();
i.remove();
try {
int readyOps = k.readyOps();
if ((readyOps & SelectionKey.OP_READ) != 0 || readyOps == 0) {
if (!read(k)) {
// Connection already closed - no need to handle write.
continue;
}
}
if ((readyOps & SelectionKey.OP_WRITE) != 0) {
writeFromSelectorLoop(k);
}
} catch (CancelledKeyException e) {
close(k);
}
if (cleanUpCancelledKeys()) {
break; // break the loop to avoid ConcurrentModificationException
}
}
}
Example 15
| Source File: Relay.java From gnirehtet with Apache License 2.0 | 5 votes |
|
public void run() throws IOException {
Selector selector = Selector.open();
// will register the socket on the selector
TunnelServer tunnelServer = new TunnelServer(port, selector);
Log.i(TAG, "Relay server started");
long nextCleaningDeadline = System.currentTimeMillis() + UDPConnection.IDLE_TIMEOUT;
while (true) {
long timeout = Math.max(0, nextCleaningDeadline - System.currentTimeMillis());
selector.select(timeout);
Set<SelectionKey> selectedKeys = selector.selectedKeys();
long now = System.currentTimeMillis();
if (now >= nextCleaningDeadline || selectedKeys.isEmpty()) {
tunnelServer.cleanUp();
nextCleaningDeadline = now + CLEANING_INTERVAL;
}
for (SelectionKey selectedKey : selectedKeys) {
SelectionHandler selectionHandler = (SelectionHandler) selectedKey.attachment();
selectionHandler.onReady(selectedKey);
}
// by design, we handled everything
selectedKeys.clear();
}
}
Example 16
| Source File: NIOServer.java From JavaBase with MIT License | 4 votes |
|
private void start() throws Exception {
Selector selector = Selector.open();
//通过OPEN方法来打开一个未绑定的ServerSocketChannel 实例
ServerSocketChannel server = ServerSocketChannel.open();
//将该ServerSocketChannel绑定到指定 ip 端口
server.bind(new InetSocketAddress(PORT));
//设置是NIO 非阻塞模式
server.configureBlocking(false);
//将sever注册到指定Selector对象上
server.register(selector, SelectionKey.OP_ACCEPT);
while (!stop) {
// 因为只有在选择了至少一个通道后，才会返回该选择器的唤醒方法，或者当前线程中断，以先到者为准。否则一直阻塞
selector.select();
//依次处理selector上的每个已经准备好的管道
Set<SelectionKey> selectedKeys = selector.selectedKeys();
for (SelectionKey sk : selectedKeys) {
//从selector上的已选择key集 中删除正在处理的连接请求
selector.selectedKeys().remove(sk);
// 连接 accept
if (sk.isAcceptable()) {
register(selector, server, sk);
}
// 连接建立
else if (sk.isConnectable()) {
System.out.println("close");
}
// 读就绪
else if (sk.isReadable()) {
readContent(selector, sk);
}
// 写就绪
else if (sk.isWritable()) {
}
}
}
}
Example 17
| Source File: NioEchoServer.java From JavaTutorial with Apache License 2.0 | 4 votes |
|
/**
* 启动服务器。
*
* @param port 服务监听的端口
* @param selectTimeout {@link Selector}检查通道就绪状态的超时时间（单位：毫秒）
*/
private static void startServer(int port, int selectTimeout) {
ServerSocketChannel serverChannel = null;
try {
serverChannel = ServerSocketChannel.open();
serverChannel.configureBlocking(false);
ServerSocket serverSocket = serverChannel.socket();
serverSocket.bind(new InetSocketAddress(port));
if (logger.isLoggable(Level.INFO)) {
logger.info("NIO echo网络服务启动完毕，监听端口：" +port);
}
Selector selector = Selector.open();
serverChannel.register(selector, SelectionKey.OP_ACCEPT);
while (true) {
int selectNum = selector.select(selectTimeout);
if (0 == selectNum) {
continue;
}
Set<SelectionKey> selectionKeys = selector.selectedKeys();
Iterator<SelectionKey> it = selectionKeys.iterator();
while (it.hasNext()) {
SelectionKey selectionKey = (SelectionKey) it.next();
// 接受新的Socket连接
if (selectionKey.isAcceptable()) {
acceptNew(selector, selectionKey);
}
// 读取并处理Socket的数据
if (selectionKey.isReadable()) {
readData(selector, selectionKey);
}
it.remove();
} // end of while iterator
}
} catch (IOException e) {
logger.log(Level.SEVERE, "处理网络连接出错", e);
}
}
Example 18
| Source File: Reactor.java From JavaTutorial with Apache License 2.0 | 4 votes |
|
/**
* 启动服务。
*/
public void start() {
ServerSocketChannel serverChannel = null;
try {
serverChannel = ServerSocketChannel.open();
serverChannel.configureBlocking(false);
ServerSocket serverSocket = serverChannel.socket();
serverSocket.bind(new InetSocketAddress(_port));
_isRun = true;
if (logger.isLoggable(Level.INFO)) {
logger.info("NIO echo网络服务启动完毕，监听端口：" +_port);
}
Selector selector = Selector.open();
serverChannel.register(selector, SelectionKey.OP_ACCEPT, new Acceptor(selector, serverChannel));
while (_isRun) {
int selectNum = selector.select(_selectTimeout);
if (0 == selectNum) {
continue;
}
Set<SelectionKey> selectionKeys = selector.selectedKeys();
Iterator<SelectionKey> it = selectionKeys.iterator();
while (it.hasNext()) {
SelectionKey selectionKey = (SelectionKey) it.next();
// 接受新的Socket连接
if (selectionKey.isValid() && selectionKey.isAcceptable()) {
Acceptor acceptor = (Acceptor) selectionKey.attachment();
acceptor.accept();
}
// 读取并处理Socket的数据
if (selectionKey.isValid() && selectionKey.isReadable()) {
Reader reader = (Reader) selectionKey.attachment();
reader.read();
}
// 移除已经处理过的Key
it.remove();
} // end of while iterator
}
} catch (IOException e) {
logger.log(Level.SEVERE, "处理网络连接出错", e);
}
}
Example 19
| Source File: SelectReceiveSendUdpPong.java From aeron with Apache License 2.0 | 4 votes |
|
private void run() throws IOException
{
final InetSocketAddress sendAddress = new InetSocketAddress("localhost", Common.PONG_PORT);
final ByteBuffer buffer = ByteBuffer.allocateDirect(Configuration.MTU_LENGTH_DEFAULT);
final DatagramChannel receiveChannel = DatagramChannel.open();
Common.init(receiveChannel);
receiveChannel.bind(new InetSocketAddress("localhost", Common.PING_PORT));
final DatagramChannel sendChannel = DatagramChannel.open();
Common.init(sendChannel);
final Selector selector = Selector.open();
final IntSupplier handler =
() ->
{
try
{
buffer.clear();
receiveChannel.receive(buffer);
final long receivedSequenceNumber = buffer.getLong(0);
final long receivedTimestamp = buffer.getLong(SIZE_OF_LONG);
buffer.clear();
buffer.putLong(receivedSequenceNumber);
buffer.putLong(receivedTimestamp);
buffer.flip();
sendChannel.send(buffer, sendAddress);
}
catch (final IOException ex)
{
ex.printStackTrace();
}
return 1;
};
receiveChannel.register(selector, OP_READ, handler);
final AtomicBoolean running = new AtomicBoolean(true);
SigInt.register(() -> running.set(false));
while (true)
{
while (selector.selectNow() == 0)
{
if (!running.get())
{
return;
}
}
final Set<SelectionKey> selectedKeys = selector.selectedKeys();
final Iterator<SelectionKey> iter = selectedKeys.iterator();
while (iter.hasNext())
{
final SelectionKey key = iter.next();
if (key.isReadable())
{
((IntSupplier)key.attachment()).getAsInt();
}
iter.remove();
}
}
}
Example 20
| Source File: HAReceiveService.java From database with GNU General Public License v2.0 | 3 votes |
|
/**
* Blocking wait for a client connection.
*
* @throws IOException
* if something goes wrong.
*/
protected void awaitAccept() throws IOException {
// blocking wait for a client connection.
final Selector serverSelector = Selector.open();
try {
final SelectionKey serverKey = server.register(serverSelector,
SelectionKey.OP_ACCEPT);
try {
serverSelector.select(); // blocks
final Set<SelectionKey> keys = serverSelector
.selectedKeys();
final Iterator<SelectionKey> iter = keys.iterator();
while (iter.hasNext()) {
final SelectionKey key = (SelectionKey) iter.next();
iter.remove();
if (key != serverKey)
throw new AssertionError();
break;
}
} finally {
serverKey.cancel();
}
} finally {
serverSelector.close();
}
}
