isResourceCacheable  
  abstract fun isResourceCacheable(    isFromAlternateCacheKey: Boolean,     dataSource: DataSource,     encodeStrategy: EncodeStrategy): Boolean
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Returns true if this request should cache the final transformed resource.
Parameters
isFromAlternateCacheKey    
true if the resource we've decoded was loaded using an alternative, rather than the primary, cache key.
dataSource 
Indicates where the data used to decode the resource was originally retrieved.
encodeStrategy 
The EncodeStrategy the will use to encode the resource.