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Proxy Pattern

Proxy Pattern 


Gamma Categorization: Structural Design Pattern
Summary:Provide a surrogate or placeholder for another object to control access to it.

Sample Code

Problem: We want to create a proxy class to intercept the server connection.

Code

public class StorageServer
{
    private string ServerURL;
    public void Connect() 
    {  
        System.Console.WriteLine("Connecting to server."); 
    }

    public void UploadFile() 
    { 
        System.Console.WriteLine("Uploading a file."); 
    }
    
    public List<string> ListFiles() 
    { 
        System.Console.WriteLine("Listing server files."); 
        return new List<string>(); 
    }
}

public class StorageProxy
{
    StorageServer server = new StorageServer();

    public void Connect() => server.Connect();
    public void UploadFile() => server.UploadFile();
    public List<string> ListFiles() => server.ListFiles();
}

Usage

var storage = new StorageProxy();

storage.Connect();
storage.ListFiles();

Output

Connecting to server.
Listing server files.

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