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It is bad practice to use transport layer specific objects in the business layer. All JSON objects should be translated to real POJOs to allow clean and better method signatures.
Right a JsonCommand is created and provided as arguments to the Service layer. We want to offer a real internal API in the future and for this we need to provide proper method signature.
Needed changes:
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Refactor CommandWrapper to use a generic payload not a JSON string
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Allow setting the entity, action, and href in CommandWrapper to create a new instance
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Refactor all Services to use the real data objects
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Refactor CommandProcessors to use GSON to serialize the CommandWrapper payload for storing and replay
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Use JsonCommand only for data input via the REST API
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