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package org.infinispan.spring.embedded.provider;

import java.util.Collection;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.ConcurrentMap;

import org.infinispan.Cache;
import org.infinispan.manager.EmbeddedCacheManager;
import org.infinispan.spring.common.provider.SpringCache;
import org.springframework.cache.CacheManager;
import org.springframework.util.Assert;

/**
 * 
 * A {@link CacheManager CacheManager} implementation that is
 * backed by an {@link EmbeddedCacheManager
 * Infinispan EmbeddedCacheManager} instance.
 * 
 * 
 * Note that this CacheManager does support adding new
 * {@link org.infinispan.Cache Caches} at runtime, i.e. Caches added
 * programmatically to the backing EmbeddedCacheManager after this
 * CacheManager has been constructed will be seen by this CacheManager.
 * 
 *
 * @author Olaf Bergner
 * @author Marius Bogoevici
 *
 */
public class SpringEmbeddedCacheManager implements CacheManager {

   private final EmbeddedCacheManager nativeCacheManager;
   private final ConcurrentMap springCaches = new ConcurrentHashMap<>();

   /**
    * @param nativeCacheManager Underlying cache manager
    */
   public SpringEmbeddedCacheManager(final EmbeddedCacheManager nativeCacheManager) {
      Assert.notNull(nativeCacheManager,
                     "A non-null instance of EmbeddedCacheManager needs to be supplied");
      this.nativeCacheManager = nativeCacheManager;
   }

   @Override
   public SpringCache getCache(final String name) {
      return springCaches.computeIfAbsent(name, n -> {
         final Cache nativeCache = this.nativeCacheManager.getCache(n);

         return new SpringCache(nativeCache);
      });
   }

   @Override
   public Collection getCacheNames() {
      return this.nativeCacheManager.getCacheNames();
   }

   /**
    * Return the {@link EmbeddedCacheManager
    * org.infinispan.manager.EmbeddedCacheManager} that backs this
    * CacheManager.
    *
    * @return The {@link EmbeddedCacheManager
    *         org.infinispan.manager.EmbeddedCacheManager} that backs this
    *         CacheManager
    */
   public EmbeddedCacheManager getNativeCacheManager() {
      return this.nativeCacheManager;
   }

   /**
    * Stop the {@link EmbeddedCacheManager EmbeddedCacheManager} this
    * CacheManager delegates to.
    */
   public void stop() {
      this.nativeCacheManager.stop();
      this.springCaches.clear();
   }
}