Examples of java.nio.channels.Selector.select()

java.nio.channels.Selector.select()
Selects a set of keys whose corresponding channels are ready for I/O operations.
This method performs a blocking selection operation. It returns only after at least one channel is selected, this selector's {@link #wakeup wakeup} method is invoked, the currentthread is interrupted, or the given timeout period expires, whichever comes first.
This method does not offer real-time guarantees: It schedules the timeout as if by invoking the {@link Object#wait(long)} method.
@param timeout If positive, block for up to timeoutmilliseconds, more or less, while waiting for a channel to become ready; if zero, block indefinitely; must not be negative @return The number of keys, possibly zero,whose ready-operation sets were updated @throws IOException If an I/O error occurs @throws ClosedSelectorException If this selector is closed @throws IllegalArgumentException If the value of the timeout argument is negative

        AcceptHandler acceptHandler = new AcceptHandler(ioHandler);


        channel.register(selector, SelectionKey.OP_ACCEPT, acceptHandler);


        int n;
        while((n = selector.select()) > 0) {
            // Someone is ready for I/O, get the ready keys
            Set<SelectionKey> selectedKeys = selector.selectedKeys();
            final Iterator<SelectionKey> keyItor = selectedKeys.iterator();
            while(keyItor.hasNext()) {
                SelectionKey key = keyItor.next();

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                }
                count = 1;


                tmpKey = channel.register(readSelector, SelectionKey.OP_READ);
                tmpKey.interestOps(tmpKey.interestOps() | SelectionKey.OP_READ);
                int code = readSelector.select(readTimeout);
                tmpKey.interestOps(tmpKey.interestOps() & (~SelectionKey.OP_READ));


                if(code == 0) {
                    return 0; // Return on the main Selector and try again.
                }

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                        in_channel.configureBlocking(false);
                        out_channel.configureBlocking(false);
                        in_channel.register(sel, SelectionKey.OP_READ);
                        out_channel.register(sel, SelectionKey.OP_READ);
                        
                        while (sel.select() > 0) {
                            ready_keys=sel.selectedKeys();
                            for (Iterator it=ready_keys.iterator(); it.hasNext();) {
                                key=(SelectionKey) it.next();
                                it.remove(); // remove current entry (why ?)
                                tmp=(SocketChannel) key.channel();

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                }
                count = 1;


                tmpKey = channel.register(readSelector, SelectionKey.OP_READ);
                tmpKey.interestOps(tmpKey.interestOps() | SelectionKey.OP_READ);
                int code = readSelector.select(readTimeout);
                tmpKey.interestOps(tmpKey.interestOps() & (~SelectionKey.OP_READ));


                if(code == 0) {
                    return 0; // Return on the main Selector and try again.
                }

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            Selector selector = null;
            try {
                selector = Selector.open();
                nim.channel.configureBlocking(false);
                SelectionKey key = nim.channel.register(selector, SelectionKey.OP_READ);
                int n = selector.select(timeout);


                if(n > 0) {
                    IRubyObject readItems = io.read(new IRubyObject[]{recv.getRuntime().newFixnum(1024*16)});
                    return buf.concat(readItems);
                } else {

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            ((SelectableChannel) channel).register(selector, real_ops, descriptor);
        } else {
            key.interestOps(key.interestOps()|real_ops);
        }


        while(selector.select() == 0);


        for (Iterator i = selector.selectedKeys().iterator(); i.hasNext(); ) {
            SelectionKey skey = (SelectionKey) i.next();
            if ((skey.interestOps() & skey.readyOps() & (SelectionKey.OP_WRITE)) != 0) {
                if(skey.attachment() == descriptor) {

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            ((SelectableChannel) channel).register(selector, real_ops, descriptor);
        } else {
            key.interestOps(key.interestOps()|real_ops);
        }


        while(selector.select() == 0);


        for (Iterator i = selector.selectedKeys().iterator(); i.hasNext(); ) {
            SelectionKey skey = (SelectionKey) i.next();
            if ((skey.interestOps() & skey.readyOps() & (SelectionKey.OP_READ | SelectionKey.OP_ACCEPT)) != 0) {
                if(skey.attachment() == descriptor) {

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           if (pending.isEmpty() && unselectable_reads.isEmpty() && unselectable_writes.isEmpty()) {
               if (has_timeout) {
                   if (timeout==0) {
                       selector.selectNow();
                   } else {
                       selector.select(timeout);                       
                   }
               } else {
                   selector.select();
               }
           } else {

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                       selector.selectNow();
                   } else {
                       selector.select(timeout);                       
                   }
               } else {
                   selector.select();
               }
           } else {
               selector.selectNow();               
           }

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            Thread.currentThread().setName("DatagramConnector-" + id);


            Selector selector = DatagramConnectorDelegate.this.selector;
            for (;;) {
                try {
                    int nKeys = selector.select();


                    registerNew();
                    doUpdateTrafficMask();


                    if (nKeys > 0) {

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