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package eu.unicore.services.registry;

import java.util.Calendar;
import java.util.Map;

import org.apache.logging.log4j.Logger;

import eu.unicore.util.Log;


/**
 * Local Registry. 

 * 
 * Entries in the local registry can be pushed to one or more external registries,
 * with a simple update/refresh mechanism. The lifetime of a local registry entry is determined 
 * by the smallest termination time returned by the external registries minus a grace period (60 secs).
 * In case the external registries fail to respond, the lifetime supplied to Add() is used, or 
 * as fallback, a fixed interval of 5 minutes. This mechanism ensures that the external registries are 
 * in a reasonably up-to-date state.

 *
 * Entries can be flagged as "internal", so they WON'T get pushed.
 *
 * @author demuth
 * @author schuller
 */
public class LocalRegistryImpl extends RegistryImpl {

	private static final Logger logger = Log.getLogger(Log.SERVICES+".registry", LocalRegistryImpl.class);
	
	/**
	 * push entry to any configured external registries.
	 * The lifetime of the new entry is determined by the external registry, or 
	 * the time supplied to this method, or a 5 minute fallback.
	 * (pushing can be disabled by setting "InternalEntry" to "true"
	 * in the content map)
	 */
	@Override
	protected Calendar pushToExternalRegistries(Mapcontent, Calendar requestedTT) {
		try {
			RegistryHandler rh = kernel.getAttribute(RegistryHandler.class);
			if(rh!=null && rh.usesExternalRegistry()
					&& !Boolean.parseBoolean(content.get(MARK_ENTRY_AS_INTERNAL))){
				ExternalRegistryClient externalRegistryClient = rh.getExternalRegistryClient();
				requestedTT = externalRegistryClient.addRegistryEntry(content);
				if(logger.isDebugEnabled()) {
					String endpoint = content.get(RegistryImpl.ENDPOINT);
					logger.debug("Will try to re-add entry for <{}> at: ", endpoint, requestedTT.getTime());
				}
			}
		} catch (Exception e) {
			Log.logException("Could not connect to external Registry!",e,logger);
		}
		return requestedTT;
	}

	@Override
	public Calendar getDefaultEntryLifetime() {
		Calendar tt = Calendar.getInstance();
		tt.add(Calendar.MINUTE, 5);
		return tt;
	}
}