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package com.pdd.pop.ext.glassfish.grizzly.nio;
import java.io.IOException;
import java.nio.channels.Selector;
import java.nio.channels.spi.SelectorProvider;
/**
* Utility class for {@link Selector} related operations.
* @author Alexey Stashok
*/
public final class Selectors {
/**
* Creates new {@link Selector} using passed {@link SelectorProvider}.
*
* @param provider {@link SelectorProvider}
* @return {@link Selector}
* @throws IOException
*/
public static Selector newSelector(final SelectorProvider provider)
throws IOException {
try {
return provider.openSelector();
} catch (NullPointerException e) {
// This is a JDK issue http://bugs.glassfish.com/view_bug.do?bug_id=6427854
// Try 5 times and abort
for (int i = 0; i < 5; i++) {
try {
return provider.openSelector();
} catch (NullPointerException ignored) {
}
}
throw new IOException("Can not open Selector due to NPE");
}
}
}