Client-Side Implementation of Unary RPC
Write the client implementation of the deleteFile method.
When a user wants to delete a file, they pass the name of the file and the address of the server where the file is stored as command line arguments. On the client-side, we will parse the arguments and, if certain conditions are met, call the deleteFile method of the SampleCLIClient class. This method will call the deleteFile method of the FTPServiceClient class. In this lesson we show the client side implementation of the unary deleteFile RPC. The client side is implemented in the ftp-service-client module and it is called using the ftp-service-cli-client module.
Client side implementation of deleteFile method
The ftp-service-client module contains the client implementation of the FTP service. Open the FTPServiceClient class from the src/main/java/io/datajek/ftpservice/client package. We will create a deleteFile method as follows:
public class FTPServiceClient implements AutoCloseable {//...public void deleteFile(String filenameToDelete, StreamObserver<Result> resultStreamObserver) {}}
The deleteFile method deletes a file from the server’s destination directory. The client sends a request to the server with the filename to delete. The server responds with the result of the operation.
The method takes two input parameters:
filenameToDelete: This parameter is a string that represents the name of the file we want to delete on the server.resultStreamObserver: It is aStreamObserverthat allows the client to receive asynchronous responses from the server. In this case, it’s used to handle the server’s response to the delete file request.
Inside the deleteFile method, we will send the file name to delete as a MetaData message. The message is created as follows:
MetaData.newBuilder()creates a new builder instance for theMetaDatamessage....