package org.infinispan.cdi.embedded;

import java.util.Collection;

import org.infinispan.Cache;
import org.infinispan.distexec.DistributedExecutorService;

/**
 * ContextInputCache keeps track of {@link Input} cache to be injected into Callables from
 * {@link DistributedExecutorService} using CDI
 * mechanism. The cache injected will be the cache used to construct
 * {@link DistributedExecutorService}
 *
 * @author Vladimir Blagoejvic
 * @since 5.2
 * @see InfinispanExtensionEmbedded#registerInputCacheCustomBean(javax.enterprise.inject.spi.AfterBeanDiscovery,
 *      javax.enterprise.inject.spi.BeanManager)
 *
 */
public class ContextInputCache {

   /*
    * Using thread local was the last choice. See https://issues.jboss.org/browse/ISPN-2181 for more
    * details and design decisions made
    */
   private static ThreadLocal<Cache<?, ?>> contextualCache = new ThreadLocal<Cache<?, ?>>();
   private static ThreadLocal<Collection<?>> contextualKeys = new ThreadLocal<>();

   public static <K, V> void set(Cache<K, V> input) {
      contextualCache.set(input);
   }

   @SuppressWarnings("unchecked")
   public static <K, V> Cache<K, V> get() {
      return (Cache<K, V>) contextualCache.get();
   }

   public static <K> void setKeys(Collection<K> inputKeys) {
      contextualKeys.set(inputKeys);
   }

   public static <K> Collection<K> getKeys(){
      return (Collection<K>) contextualKeys.get();
   }

   public static void clean() {
      contextualCache.remove();
      contextualKeys.remove();
   }

}
