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package com.cedarsoft.gdao.caching;

import com.cedarsoft.gdao.GenericService;
import org.jetbrains.annotations.NotNull;
import org.jetbrains.annotations.Nullable;

/**
 *
 */
public class CachingService extends CachingDao implements GenericService {
  public CachingService( @NotNull GenericService backingService ) {
    super( backingService );
  }

  @NotNull
  protected GenericService getBackingService() {
    return ( GenericService ) super.getBackingDao();
  }

  @Nullable
  public  R perform( @NotNull final ServiceCallback callback ) {
    R returnValue = getBackingService().perform( callback );
    cache.getLock().writeLock().lock();
    try {
      cache.clear();
      cache.addAll( getBackingService().findAll() );
    } finally {
      cache.getLock().writeLock().unlock();
    }
    return returnValue;
  }
}