With HLF, chaincode must implement the chaincode interface in any of these languages: Go, Node.js, or Java. A chaincode developer can select any of these programming languages to develop in. Fabric's shim package (github.com/hyperledger/fabric/core/chaincode/shim) is paramount in chaincode development.
It provides support for all earlier languages. This package has two interfaces, which play a key role in the chaincode. The syntax of these interfaces and their methods may change, depending on the language, but their purpose is the same.
Essentially, when a transaction is received, these chaincode interfaces are called. Firstly, when a chaincode receives a transaction request, the Init method is invoked. This allows for the initialization of the application state. Subsequently, the Invoke methods are called when an invoke transaction...
