package com.atlassian.plugin.refimpl.cache;
   
   import com.atlassian.vcache.VCacheFactory;
   import com.atlassian.vcache.internal.RequestContext;
   import com.atlassian.vcache.internal.test.EmptyVCacheSettingsDefaultsProvider;
   import com.atlassian.vcache.internal.core.DefaultVCacheCreationHandler;
   import com.atlassian.vcache.internal.core.ThreadLocalRequestContextSupplier;
   import com.atlassian.vcache.internal.core.metrics.DefaultMetricsCollector;
   import com.atlassian.vcache.internal.guava.GuavaServiceSettingsBuilder;
  import com.atlassian.vcache.internal.guava.GuavaVCacheService;
  
  import java.time.Duration;
  import java.util.function.Supplier;
  
  import static com.atlassian.vcache.ChangeRate.HIGH_CHANGE;
  
  /**
   * I chose to follow org.springframework.beans.factory.FactoryBean interface even though we don't have spring here,
   * because we want to add Dependency Injection at some point (see REFAPPDEV-13) and it's likely to be Spring, thus when
   * we do add it we could just add 'implements' to this one do the happy dance
   */
  public class VCacheFactoryBean {
      private static final String PRODUCT_IDENTIFIER = "refapp";
  
      private final Supplier<RequestContext> requestContextSupplier = ThreadLocalRequestContextSupplier.lenientSupplier(() -> "refapp-tenant");
      private final VCacheFactory vCacheFactory = new GuavaVCacheService(
              PRODUCT_IDENTIFIER,
              requestContextSupplier,
              new EmptyVCacheSettingsDefaultsProvider(),
              cacheCreationHandler(),
              new DefaultMetricsCollector(requestContextSupplier),
              new GuavaServiceSettingsBuilder().build(),
              context -> {}
      );
  
      public VCacheFactoryBean() {
      }
  
      public VCacheFactory getObject()
      {
          return vCacheFactory;
      }
  
      Class getObjectType() {
          return VCacheFactory.class;
      }
  
      boolean isSingleton() {
          return true;
      }
  
      private DefaultVCacheCreationHandler cacheCreationHandler()
      {
          return new DefaultVCacheCreationHandler(10_000, Duration.ofHours(1), 10_000, HIGH_CHANGE, HIGH_CHANGE);
      }
  }