org.glassfish.jersey.server.internal.ConfigHelper Maven / Gradle / Ivy
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package org.glassfish.jersey.server.internal;
import org.glassfish.jersey.internal.inject.Providers;
import org.glassfish.jersey.server.ApplicationHandler;
import org.glassfish.jersey.server.spi.AbstractContainerLifecycleListener;
import org.glassfish.jersey.server.spi.Container;
import org.glassfish.jersey.server.spi.ContainerLifecycleListener;
/**
* Helper class to provide some common functionality related to {@link org.glassfish.jersey.server.ResourceConfig application configuration}.
*
* @author Jakub Podlesak (jakub.podlesak at oracle.com)
*/
public final class ConfigHelper {
private static final ContainerLifecycleListener EMPTY_CONTAINER_LIFECYCLE_LISTENER =
new AbstractContainerLifecycleListener() {
};
/**
* Provides a single ContainerLifecycleListener instance based on the {@link ApplicationHandler application} configuration.
* This method looks for providers implementing {@link ContainerLifecycleListener} interface and aggregates them into
* a single umbrella listener instance that is returned.
*
* @param applicationHandler actual application from where to get the listener.
* @return a single instance of a ContainerLifecycleListener, can not be null.
*/
public static ContainerLifecycleListener getContainerLifecycleListener(final ApplicationHandler applicationHandler) {
final Iterable listeners = Providers.getAllProviders(applicationHandler.getServiceLocator(),
ContainerLifecycleListener.class);
return !listeners.iterator().hasNext() ? EMPTY_CONTAINER_LIFECYCLE_LISTENER : new ContainerLifecycleListener() {
@Override
public void onStartup(Container container) {
for (ContainerLifecycleListener listener : listeners) {
listener.onStartup(container);
}
}
@Override
public void onReload(Container container) {
for (ContainerLifecycleListener listener : listeners) {
listener.onReload(container);
}
}
@Override
public void onShutdown(Container container) {
for (ContainerLifecycleListener listener : listeners) {
listener.onReload(container);
}
}
};
}
}