A general interface for indexable, serializable and input-output objects.
readResource and writeResource are implemented by default as read-write to files with its key as filename
serialize and deserialize are specified just to allow these defaults. If you define your own persistence, then
serialize and deserialize are not needed. The package Workflow need them anyway.
minimal definition: keyResource, serialize, deserialize
While serialize and deserialize are agnostic about the way of converison to strings, either binary or textual, treadp and
tshowp use the monad defined in the RefSerialize package. Both ways of serialization are alternative. one is defined
by default in terms of the other. the RefSerialize monad has been introduced to permit IResource objects to be
serialized as part of larger structures that embody them. This is necessary for the Workdlow package.
The keyResource string must be a unique since this is used to index it in the hash table.
when accessing a resource, the user must provide a partial object for wich the key can be obtained.
for example:
data Person= Person{name, surname:: String, account :: Int ....)
keyResource Person n s ...= n++s the data being accesed must have the fields used by keyResource filled. For example
readResource Person {name=John, surname= Adams} leaving the rest of the fields undefined
IResource has defaults definitions for all the methods except keyResource
Either one or other serializer must be defiened for default witeResource, readResource and delResource
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