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package org.glassfish.grizzly.nio;
import java.util.HashMap;
import java.util.Map;
import java.util.Set;
import java.util.concurrent.CountDownLatch;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.locks.Lock;
import java.util.logging.Level;
import java.util.logging.Logger;
import org.glassfish.grizzly.GracefulShutdownListener;
import org.glassfish.grizzly.Grizzly;
import org.glassfish.grizzly.ShutdownContext;
import org.glassfish.grizzly.Transport;
import org.glassfish.grizzly.localization.LogMessages;
class GracefulShutdownRunner implements Runnable {
private static final Logger LOGGER = Grizzly.logger(GracefulShutdownRunner.class);
private final NIOTransport transport;
private final Set<GracefulShutdownListener> shutdownListeners;
private final ExecutorService shutdownService;
private final long gracePeriod;
private final TimeUnit timeUnit;
// -------------------------------------------------------- Constructors
GracefulShutdownRunner(final NIOTransport transport,
final Set<GracefulShutdownListener> shutdownListeners,
final ExecutorService shutdownService,
final long gracePeriod, final TimeUnit timeUnit) {
this.transport = transport;
this.shutdownListeners = shutdownListeners;
this.shutdownService = shutdownService;
this.gracePeriod = gracePeriod;
this.timeUnit = timeUnit;
}
// ----------------------------------------------- Methods from Runnable
@Override
public void run() {
final int listenerCount = shutdownListeners.size();
final CountDownLatch shutdownLatch = new CountDownLatch(listenerCount);
// If there there is no timeout, invoke the listeners in the
// same thread otherwise use one additional thread to invoke them.
final Map<ShutdownContext,GracefulShutdownListener> contexts =
new HashMap<ShutdownContext,GracefulShutdownListener>(listenerCount);
if (gracePeriod <= 0) {
for (final GracefulShutdownListener l : shutdownListeners) {
final ShutdownContext ctx = createContext(contexts, l, shutdownLatch);
l.shutdownRequested(ctx);
}
} else {
shutdownService.execute(new Runnable() {
@Override
public void run() {
for (final GracefulShutdownListener l : shutdownListeners) {
final ShutdownContext ctx = createContext(contexts, l, shutdownLatch);
l.shutdownRequested(ctx);
}
}
});
}
try {
if (gracePeriod <= 0) {
shutdownLatch.await();
} else {
if (LOGGER.isLoggable(Level.WARNING)) {
LOGGER.log(Level.WARNING,
LogMessages.WARNING_GRIZZLY_GRACEFULSHUTDOWN_MSG(
transport.getName() + '[' + Integer.toHexString(hashCode()) + ']',
gracePeriod, timeUnit));
}
final boolean result = shutdownLatch.await(gracePeriod, timeUnit);
if (!result) {
if (LOGGER.isLoggable(Level.WARNING)) {
LOGGER.log(Level.WARNING,
LogMessages.WARNING_GRIZZLY_GRACEFULSHUTDOWN_EXCEEDED(
transport.getName() + '[' + Integer.toHexString(hashCode()) + ']'));
}
if (!contexts.isEmpty()) {
for (GracefulShutdownListener l : contexts.values()) {
l.shutdownForced();
}
}
}
}
} catch (InterruptedException ie) {
if (LOGGER.isLoggable(Level.WARNING)) {
LOGGER.warning(LogMessages.WARNING_GRIZZLY_GRACEFULSHUTDOWN_INTERRUPTED());
}
if (!contexts.isEmpty()) {
for (GracefulShutdownListener l : contexts.values()) {
l.shutdownForced();
}
}
} finally {
final Lock lock = transport.getState().getStateLocker().writeLock();
lock.lock();
try {
// Make sure the transport is still expecting to be shutdown
if (transport.shutdownService == this.shutdownService) {
transport.finalizeShutdown();
}
} finally {
lock.unlock();
}
}
}
private ShutdownContext createContext(final Map<ShutdownContext,GracefulShutdownListener> contexts,
final GracefulShutdownListener listener,
final CountDownLatch shutdownLatch) {
final ShutdownContext ctx = new ShutdownContext() {
boolean isNotified;
@Override
public Transport getTransport() {
return transport;
}
@Override
public synchronized void ready() {
if (!isNotified) {
isNotified = true;
contexts.remove(this);
shutdownLatch.countDown();
}
}
};
contexts.put(ctx, listener);
return ctx;
}
} // END GracefulShutdownRunner