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

java.nio.channels.Selector.selectedKeys()
Returns this selector's selected-key set.
Keys may be removed from, but not directly added to, the selected-key set. Any attempt to add an object to the key set will cause an {@link UnsupportedOperationException} to be thrown.
The selected-key set is not thread-safe.
@return This selector's selected-key set @throws ClosedSelectorException If this selector is closed

                synchronized (this) {
                } // guard
                int updatedKeys = selector.select();
                semaphore.acquire();
                {
                    Set<SelectionKey> selectedKeys = selector.selectedKeys();
                    if ((logger != null) && logger.isLoggable(Level.FINEST)) {
                        logger.log(Level.FINEST, "\n\t{0} keys updated\n\t{1} "
                                + "keys in selector''s selected key set",
                                new Object[]{updatedKeys, selectedKeys.size()});
                    }

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            selectorGuard.writeLock().unlock();


            try {
                int selectedKeyCount = selector.select(500);
                if (selectedKeyCount > 0) {
                    processSelectedKeys(selector.selectedKeys());
                }


                // Exit the loop when there's nothing to handle.
                // The shutdown flag is used to delay the shutdown of this
                // loop to avoid excessive Selector creation when

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                // from acquiring its lock.
            }
            try {
                int selectedKeyCount = selector.select(500);
                if (selectedKeyCount > 0) {
                    processSelectedKeys(selector.selectedKeys());
                }


                // Exit the loop when there's nothing to handle.
                // The shutdown flag is used to delay the shutdown of this
                // loop to avoid excessive Selector creation when

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                    // from acquiring its lock.
                }
                try {
                    int selectedKeyCount = selector.select(500);
                    if (selectedKeyCount > 0) {
                        processSelectedKeys(selector.selectedKeys());
                    }


                    // Exit the loop when there's nothing to handle.
                    // The shutdown flag is used to delay the shutdown of this
                    // loop to avoid excessive Selector creation when

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                    registerNew();
                    doUpdateTrafficMask();


                    if (nKeys > 0) {
                        processReadySessions(selector.selectedKeys());
                    }


                    flushSessions();
                    cancelKeys();

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                    int nKeys = selector.select();


                    registerNew();


                    if (nKeys > 0) {
                        processReadySessions(selector.selectedKeys());
                    }


                    flushSessions();
                    cancelKeys();

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                    int nKeys = selector.select(1000);


                    registerNew();


                    if (nKeys > 0) {
                        processSessions(selector.selectedKeys());
                    }


                    processTimedOutSessions(selector.keys());


                    if (selector.keys().isEmpty()) {

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                    int nKeys = selector.select(1000);
                    doAddNew();
                    doUpdateTrafficMask();


                    if (nKeys > 0) {
                        process(selector.selectedKeys());
                    }


                    doFlush();
                    doRemove();
                    notifyIdleness();

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                    break;
                }
                if (keyCount == 0) {
                    continue;
                }
                final Set<SelectionKey> setSelectedKeys = selector.selectedKeys();
                final Iterator<SelectionKey> it = setSelectedKeys.iterator();
                while (it.hasNext()) {
                    final SelectionKey sk = it.next();
                    it.remove();
                    // of course it is acceptable!

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                    // from acquiring its lock.
                }
                try {
                    int selectedKeyCount = selector.select(500);
                    if (selectedKeyCount > 0) {
                        processSelectedKeys(selector.selectedKeys());
                    }


                    if (selector.keys().isEmpty()) {
                        if (shutdown) {
                            try {

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