modules/jooby-guava-cache/src/main/java/org/jooby/guava/GuavaCache.java
public GuavaCache<K, V> doWith(final Callback<K, V, Cache<K, V>> configurer) {
    this.callback = requireNonNull(configurer, "Configurer callback is required.");
    return this;
  }
public GuavaCache<K, V> doWith(final Callback<K, V, Cache<K, V>> configurer) {
    this.callback = requireNonNull(configurer, "Configurer callback is required.");
    return this;
  }
Configure a cache builder and creates a new {@link Cache}.

@param configurer Configurer callback.
@return This instance.