Reactor Design Pattern

Reactor Design Pattern
(Using java nio)
By:
Allan S. Lim

Selector
Selector selector = Selector.open();

Selector
ssc
ServerSocketChannelssc = ServerSocketChannel.open();
ssc.configureBlocking( false );
ServerSocketss = ssc.socket();
InetSocketAddress address = new InetSocketAddress(port);
ss.bind( address );

register
Selector
ssc
accept
SelectionKey key = ssc.register( selector, SelectionKey.OP_ACCEPT );

register
accept
handler
Selector
ssc
accept
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 and send to a handler.
}
}

register
accept
handler
Selector
ssc
accept
read
sc
read
handler
ServerSocketChannelssc = (ServerSocketChannel)key.channel();
SocketChannel sc = ssc.accept();
sc.configureBlocking( false );
SelectionKeynewKey = sc.register( selector, SelectionKey.OP_READ );

register
accept
handler
Selector
ssc
accept
read
sc
read
handler
if ((key.readyOps() & SelectionKey.OP_ACCEPT) == SelectionKey.OP_ACCEPT) {
// Accept the new connection and send to a handler.
} else if ((key.readyOps() & SelectionKey.OP_READ) == SelectionKey.OP_READ) {
// Read the data and send the handler.
SocketChannelsc = (SocketChannel)key.channel();
}

register
accept
handler
Selector
ssc
accept
read
sc
read
handler
write
sc
write
handler
It’s the same process with the write handler.

register
accept
handler
Selector
ssc
accept
read
sc
read
handler
write
sc
write
handler
You can have an array of handlers.

C
L
I
E
N
T
S
register
accept
handler
Selector
ssc
accept
read
sc
read
handler
write
sc
write
handler
For each client event, the selector will notify the handler, and return to listening to event again.

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Reactor Design Pattern

by liminescence on Jun 14, 2011

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Reactor Design Pattern — Presentation Transcript