package com.atlassian.vcache;
   
   import java.time.Duration;
   import java.util.Optional;
   
   /**
    * Sample usage of a JvmCache.
    */
   public class JvmSample {
      private final JvmCache<String, String> cache;
  
      public JvmSample(VCacheFactory factory) {
          JvmCacheSettings settings = new JvmCacheSettingsBuilder().
                  maxEntries(10).
                  defaultTtl(Duration.ofSeconds(42)).
                  build();
          cache = factory.getJvmCache("my.cache", settings);
      }
  
      public String findFoo(String id) {
          // Don't do this
          Optional<String> cachedValue = cache.get(id);
          if (cachedValue.isPresent()) {
              return cachedValue.get();
          }
  
          final String value = "id-" + id; // really? :-0
          Optional<String> afterPut = cache.putIfAbsent(id, value);
  
          return afterPut.orElse(value);
      }
  
      public String findFoo2(String id) {
          // do this
          return cache.get(id, () -> "id-" + id);
      }
  
      public int cacheSize() {
          return cache.getKeys().size();
      }
  }