120 lines
3.4 KiB
Java
120 lines
3.4 KiB
Java
/**
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*
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*/
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package org.gcube.datatransfer.resolver.caches;
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import java.util.concurrent.TimeUnit;
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import org.gcube.common.scope.api.ScopeProvider;
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import org.gcube.datatransfer.resolver.catalogue.resource.ApplicationProfileReaderForCatalogueResolver;
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import org.gcube.datatransfer.resolver.listeners.UriResolverStartupListener;
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import org.slf4j.Logger;
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import org.slf4j.LoggerFactory;
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import com.google.common.cache.CacheBuilder;
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import com.google.common.cache.CacheLoader;
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import com.google.common.cache.LoadingCache;
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import com.google.common.cache.RemovalListener;
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import com.google.common.cache.RemovalNotification;
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/**
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* The Class LoadingCatalogueApplicationProfilesCache.
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*
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* @author Francesco Mangiacrapa at ISTI-CNR (francesco.mangiacrapa@isti.cnr.it)
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* Nov 5, 2018
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*/
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public class LoadingCatalogueApplicationProfilesCache {
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private static Logger logger = LoggerFactory.getLogger(LoadingCatalogueApplicationProfilesCache.class);
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private static LoadingCache<String, String> catalogueApplicationProfiles;
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static{
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CacheLoader<String, String> loader = new CacheLoader<String, String>(){
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@Override
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public String load(String vreName)
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throws Exception {
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logger.info("Loading the cache for vreName: "+vreName);
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String fullScope = loadFullScopeByApplicationProfile(vreName);
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logger.info("Returning fullScope: "+fullScope+ " for the VRE name: "+vreName);
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return fullScope;
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}
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};
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RemovalListener<String, String> removalListener = new RemovalListener<String, String>() {
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@Override
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public void onRemoval(RemovalNotification<String, String> arg0) {
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logger.info("cache expired");
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//prePopulateCache();
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}
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};
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catalogueApplicationProfiles = CacheBuilder.newBuilder().maximumSize(100).expireAfterWrite(
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1, TimeUnit.DAYS).removalListener(removalListener).
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build(loader);
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//Populating the cache at init stage
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populateTheCache();
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logger.info("Pre-Loaded CatalogueApplicationProfiles cache with: "+catalogueApplicationProfiles.asMap().size()+" item/s");
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}
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/**
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* Populate the cache.
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*/
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private static void populateTheCache(){
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try{
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//POPULATE THE CACHE READING THE RESOURCE "CATALOGUE-RESOLVER"
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logger.info("Trying to pre-populate catalogue resolver cache");
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ScopeProvider.instance.set(UriResolverStartupListener.getRootContextScope());
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ApplicationProfileReaderForCatalogueResolver appPrCatResolver = new ApplicationProfileReaderForCatalogueResolver(UriResolverStartupListener.getRootContextScope(), true);
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catalogueApplicationProfiles.asMap().putAll(appPrCatResolver.getHashVreNameScope());
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logger.info("Cache populated with: "+catalogueApplicationProfiles.asMap().toString());
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//logger.info("Pre-Loaded CatalogueApplicationProfiles cache is: "+catalogueApplicationProfiles.asMap().toString());
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}catch(Exception e){
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}finally{
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}
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}
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/**
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* Gets the cache.
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*
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* @return the cache
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*/
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public static LoadingCache<String, String> getCache(){
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return catalogueApplicationProfiles;
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}
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/**
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* Load application profiles.
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*
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* @param vreName the vre name
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* @return the string
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*/
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public static String loadFullScopeByApplicationProfile(String vreName){
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//THIS CHECK SHOULD BE NOT NEEDED
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String fullScope = catalogueApplicationProfiles.getIfPresent(vreName);
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if(fullScope==null){
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populateTheCache();
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fullScope = catalogueApplicationProfiles.getIfPresent(vreName);
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}
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return fullScope;
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}
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}
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