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package fish.payara.nucleus.microprofile.config.spi;
import org.eclipse.microprofile.config.Config;
import org.eclipse.microprofile.config.spi.ConfigBuilder;
import org.eclipse.microprofile.config.spi.ConfigProviderResolver;
import java.util.logging.Level;
import java.util.logging.Logger;
/**
* This class was created to resolve race condition, caused by independent parallel initialization
* of the server components, where some may init undesired automatical service lookup.
* That lookup should lead to this class, which will block all requests until
* this global resolver instance provided by the {@link ConfigProviderResolver#instance()} would
* be replaced by the HK2 service.
*
* The problem cannot be resolved by any other way, because Microprofile components use the global
* service mechanism, which is not capable to inject HK2 dependencies.
*
* @author Patrik Dudits
* @author David Matejcek
*/
public class ConfigProviderResolverSync extends ConfigProviderResolver {
private static final Logger LOG = Logger.getLogger(ConfigProviderResolverSync.class.getName());
/**
* Logs the creation of this class on finest level.
*/
public ConfigProviderResolverSync() {
LOG.finest("ConfigProviderResolverSync()");
}
@Override
public Config getConfig() {
return await().getConfig();
}
@Override
public Config getConfig(ClassLoader loader) {
return await().getConfig(loader);
}
@Override
public ConfigBuilder getBuilder() {
return await().getBuilder();
}
@Override
public void registerConfig(Config config, ClassLoader classLoader) {
await().registerConfig(config, classLoader);
}
@Override
public void releaseConfig(Config config) {
await().releaseConfig(config);
}
private ConfigProviderResolver await() {
LOG.log(Level.WARNING, "Payara Microprofile Config requested too early, the HK2 service is not initialized yet."
+ " Waiting until it will be active.");
while (true) {
final ConfigProviderResolver resolver = instance();
if (resolver != null && resolver != this) {
return resolver;
}
Thread.yield();
}
}
}