Introduction to gRPC/

...

/

Creating a gRPC Client

Creating a gRPC Client

Write the code for the gRPC client.

We'll cover the following...

FTPServiceClient class

The gRPC client provides the client-side implementation of the FTP service. It implements the logic of sending requests to add and delete files on the server. In the ftp-service-client module, we will create a class FTPServiceClient in the client package inside the src/main/java/io/datajek/ftpservice package. This is a client-side class that provides methods for interacting with a remote FTP service. It is designed to add or delete files in the server’s destination directory using gRPC communication. The FTPServiceClient class abstracts the complexity of gRPC communication and provides a convenient and efficient way to interact with the FTP server. It encapsulates the logic for file transfer and data integrity checks, making it easier for developers to use the FTP service in their applications. The FTPServiceClient class implements the AutoCloseableAutoCloseable to signal that instances of this class can be automatically closed or released when they are no longer needed. This is done to ensure proper cleanup and resource management when using the FTPServiceClient in various contexts, particularly in situations where it establishes network connections or uses other resources that need to be explicitly released.

public class FTPServiceClient implements AutoCloseable {



}
FTPServiceClient class

The FTPServiceClient class has three members as shown below:

import io.grpc.ManagedChannel;



public class FTPServiceClient implements AutoCloseable {



    private FTPServiceGrpc.FTPServiceStub asyncStub;

    private ManagedChannel channel;

    private int chunkSizeInBytes;



    public void close() throws InterruptedException {

        if (channel != null) {

            channel.shutdown();

        }

    }

}
FTPServiceClient class members

  1. asyncStub acts as a local proxy for the remote service and allows the client application to call methods on the server. It is used for sending requests and receiving responses asynchronously. It is an instance of the FTPServiceStub class. The client application uses this stub to interact with the FTPService on the server-side. The addFile method uses the asyncStub to send requests to the server for adding files, and the deleteFile method uses it to send requests to the server for deleting files.

  2. channel represents the connection to the server. It handles the network communication for gRPC calls. It is an instance of the ManagedChannelManagedChannel_class.

  3. ...