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package com.sun.enterprise.v3.services.impl;
import java.io.IOException;
import java.nio.channels.SelectableChannel;
import java.util.Collection;
import java.util.List;
import java.util.logging.Level;
import java.util.logging.Logger;
import org.glassfish.grizzly.filterchain.BaseFilter;
import org.glassfish.grizzly.filterchain.FilterChainContext;
import org.glassfish.grizzly.filterchain.NextAction;
import org.glassfish.grizzly.nio.NIOConnection;
import org.glassfish.grizzly.nio.NIOTransport;
import org.glassfish.grizzly.nio.SelectorHandler;
import org.glassfish.grizzly.nio.SelectorRunner;
import org.glassfish.hk2.api.ActiveDescriptor;
import org.glassfish.hk2.api.ServiceHandle;
import org.glassfish.hk2.api.ServiceLocator;
import org.glassfish.hk2.utilities.BuilderHelper;
import org.glassfish.internal.grizzly.LazyServiceInitializer;
/**
* The {@link org.glassfish.grizzly.filterchain.Filter} implementation,
* which lazily initializes custom service on the first accepted connection
* and passes connection there.
*
* @author Vijay Ramachandran
*/
public class ServiceInitializerFilter extends BaseFilter {
private final ServiceLocator locator;
private volatile LazyServiceInitializer targetInitializer = null;
private final List<ActiveDescriptor<?>> initializerImplList;
protected final Logger logger;
private final ServiceInitializerListener listener;
private final Object LOCK_OBJ = new Object();
// private long timeout = 60000;
public ServiceInitializerFilter(final ServiceInitializerListener listener,
final ServiceLocator habitat, final Logger logger) {
this.locator = habitat;
initializerImplList =
habitat.getDescriptors(BuilderHelper.createContractFilter(LazyServiceInitializer.class.getName()));
if (initializerImplList.isEmpty()) {
throw new IllegalStateException("NO Lazy Initializer was found for port = " +
listener.getPort());
}
this.logger = logger;
this.listener = listener;
}
@Override
public NextAction handleAccept(final FilterChainContext ctx) throws IOException {
final NIOConnection nioConnection = (NIOConnection) ctx.getConnection();
final SelectableChannel channel = nioConnection.getChannel();
if (targetInitializer == null) {
synchronized (LOCK_OBJ) {
if (targetInitializer == null) {
LazyServiceInitializer targetInitializerLocal = null;
for (final ActiveDescriptor<?> initializer : initializerImplList) {
String listenerName = listener.getName();
String serviceName = initializer.getName();
if (serviceName != null && listenerName.equalsIgnoreCase(serviceName)) {
targetInitializerLocal = (LazyServiceInitializer) locator.getServiceHandle(initializer).getService();
break;
}
}
if (targetInitializerLocal == null) {
logger.log(Level.SEVERE, "NO Lazy Initialiser implementation was found for port = {0}",
String.valueOf(listener.getPort()));
nioConnection.close();
return ctx.getStopAction();
}
if (!targetInitializerLocal.initializeService()) {
logger.log(Level.SEVERE, "Lazy Service initialization failed for port = {0}",
String.valueOf(listener.getPort()));
nioConnection.close();
return ctx.getStopAction();
}
targetInitializer = targetInitializerLocal;
}
}
}
final NextAction nextAction = ctx.getSuspendAction();
ctx.completeAndRecycle();
// Deregister channel
final SelectorRunner runner = nioConnection.getSelectorRunner();
final SelectorHandler selectorHandler =
((NIOTransport) nioConnection.getTransport()).getSelectorHandler();
selectorHandler.deregisterChannel(runner, channel);
// Underlying service rely the channel is blocking
channel.configureBlocking(true);
targetInitializer.handleRequest(channel);
return nextAction;
}
}