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package org.glassfish.grizzly.strategies;
import java.io.IOException;
import java.util.concurrent.Executor;
import java.util.logging.Logger;
import org.glassfish.grizzly.Connection;
import org.glassfish.grizzly.Context;
import org.glassfish.grizzly.Grizzly;
import org.glassfish.grizzly.IOEvent;
import org.glassfish.grizzly.IOEventLifeCycleListener;
import org.glassfish.grizzly.Transport;
import org.glassfish.grizzly.asyncqueue.AsyncQueue;
import org.glassfish.grizzly.threadpool.ThreadPoolConfig;
/**
* {@link org.glassfish.grizzly.IOStrategy}, which executes {@link org.glassfish.grizzly.Processor}s in a current thread.
*
* @author Alexey Stashok
*/
public final class SameThreadIOStrategy extends AbstractIOStrategy {
private static final SameThreadIOStrategy INSTANCE = new SameThreadIOStrategy();
private static final Logger logger = Grizzly.logger(SameThreadIOStrategy.class);
private static final InterestLifeCycleListenerWhenIoEnabled LIFECYCLE_LISTENER_WHEN_IO_ENABLED =
new InterestLifeCycleListenerWhenIoEnabled();
private static final InterestLifeCycleListenerWhenIoDisabled LIFECYCLE_LISTENER_WHEN_IO_DISABLED =
new InterestLifeCycleListenerWhenIoDisabled();
// ------------------------------------------------------------ Constructors
private SameThreadIOStrategy() { }
// ---------------------------------------------------------- Public Methods
public static SameThreadIOStrategy getInstance() {
return INSTANCE;
}
// ------------------------------------------------- Methods from IOStrategy
@Override
public boolean executeIoEvent(final Connection connection,
final IOEvent ioEvent, final boolean isIoEventEnabled)
throws IOException {
IOEventLifeCycleListener listener = null;
if (isReadWrite(ioEvent)) {
listener = isIoEventEnabled
? LIFECYCLE_LISTENER_WHEN_IO_ENABLED
: LIFECYCLE_LISTENER_WHEN_IO_DISABLED;
}
fireIOEvent(connection, ioEvent, listener, logger);
return true;
}
@Override
public Executor getThreadPoolFor(final Connection connection,
final IOEvent ioEvent) {
return null;
}
// ----------------------------------- Methods from WorkerThreadPoolConfigProducer
@Override
public ThreadPoolConfig createDefaultWorkerPoolConfig(final Transport transport) {
return null;
}
// ---------------------------------------------------------- Nested Classes
private static final class InterestLifeCycleListenerWhenIoEnabled
extends IOEventLifeCycleListener.Adapter {
@Override
public void onReregister(final Context context) throws IOException {
onComplete(context, null);
}
@Override
public void onComplete(final Context context, final Object data) throws IOException {
if (context.wasSuspended() || context.isManualIOEventControl()) {
final IOEvent ioEvent = context.getIoEvent();
final Connection connection = context.getConnection();
if (AsyncQueue.EXPECTING_MORE_OPTION.equals(data)) {
connection.simulateIOEvent(ioEvent);
} else {
connection.enableIOEvent(ioEvent);
}
}
}
@Override
public void onContextSuspend(final Context context) throws IOException {
// check manual io event control, to not disable ioevent twice
if (!context.wasSuspended() && !context.isManualIOEventControl()) {
disableIOEvent(context);
}
}
@Override
public void onContextManualIOEventControl(final Context context)
throws IOException {
// check suspended mode, to not disable ioevent twice
if (!context.wasSuspended() && !context.isManualIOEventControl()) {
disableIOEvent(context);
}
}
private static void disableIOEvent(final Context context)
throws IOException {
final Connection connection = context.getConnection();
final IOEvent ioEvent = context.getIoEvent();
connection.disableIOEvent(ioEvent);
}
}
private static final class InterestLifeCycleListenerWhenIoDisabled
extends IOEventLifeCycleListener.Adapter {
@Override
public void onReregister(final Context context) throws IOException {
onComplete(context, null);
}
@Override
public void onComplete(final Context context, final Object data)
throws IOException {
final IOEvent ioEvent = context.getIoEvent();
final Connection connection = context.getConnection();
if (AsyncQueue.EXPECTING_MORE_OPTION.equals(data)) {
connection.simulateIOEvent(ioEvent);
} else {
connection.enableIOEvent(ioEvent);
}
}
}
}