> various layers involved. The bit I don't understand is how the adaptable > pattern would make those go away. To me that pattern is just another way to > implement this but it would also need to deal with all those layers.
Yes this adapter support would need to be implement at all layers. So call to 1. binary.adaptTo(SignedBinary.class) //binary is JCR Binary 2. results in blob.adaptTo(SignedBinary.class) //blob is Oak Blob. Blob interface would extend adaptable 3. results in SegmentBlob delegating to BlobStoreBlob which 4. delegates to BlobStore // Here just passing the BlobId 5. which delegates to DataStoreBlobStore 6. which delegates to S3DataStore 7. which returns the SignedBinary implementation However adapter support would allow us to make this instance of check extensible. Otherwise we would be hardcoding instance of check to SignedBinary at each of the above place though those layers need not be aware of SignedBinary support (its specific to S3 impl) Chetan Mehrotra
