// When finished, invoker must ensure that selector is empty
// by cancelling any related keys and explicitly releasing
// the selector by invoking releaseTemporarySelector()
static Selector getTemporarySelector(SelectableChannel sc) throws IOException {
SoftReference ref = (SoftReference) localSelector.get();
SelectorWrapper selWrapper = null;
Selector sel = null;
if (ref == null
|| ((selWrapper = (SelectorWrapper) ref.get()) == null)
|| ((sel = selWrapper.get()) == null)
|| (sel.provider() != sc.provider())) {
sel = sc.provider().openSelector();
localSelector.set(new SoftReference(new SelectorWrapper(sel)));
} else {
localSelectorWrapper.set(selWrapper);
}
return sel;
}
public void run() {
try {
sel.close();
} catch (Throwable th) {
throw new Error(th);
}
}
static void releaseTemporarySelector(Selector sel) throws IOException {
// Selector should be empty
sel.selectNow(); // Flush cancelled keys
assert sel.keys().isEmpty() : "Temporary selector not empty";
localSelectorWrapper.set(null);
}