Java Memcached Quit (Detailed Guide w/ Code Examples)

Use Case(s)

The quit command in Memcached is typically used to immediately close a connection. This is particularly useful in cases where the client wishes to expressly terminate its network link with the Memcached server, such as when it is shutting down or no longer requires the stored data.

Code Examples

Here's an example of how you might use the quit command in Java using the spyMemcached client:

import net.spy.memcached.MemcachedClient;

public class Main {
    public static void main(String[] args) {
        try {
            // Create a memCached Client
            MemcachedClient mcc = new MemcachedClient(new InetSocketAddress("127.0.0.1", 11211));

            System.out.println("Connection to server successful.");

            // set data into cache
            Future fo = mcc.set("project:data", 900, "This is test data");

            // get data from cache
            System.out.println("Data in cache - " + mcc.get("project:data"));

            // Now quit the connection before closing
            mcc.shutdown();

            System.out.println("Disconnected from Memcached server.");
        } catch(Exception ex){
            System.err.println( ex.getClass().getName() + ": " + ex.getMessage() );
        }
    }
}

In this code, we set up a connection to a local Memcached server and store some data. We then retrieve the data and print it out. Finally, we call the shutdown method to disconnect from the server, which is where the 'quit' operation occurs.

Best Practices

When working with Memcached, it's generally a good idea to minimize the number of connections to the server. Calling quit allows us to close connections when they're no longer needed, thereby conserving resources.

Common Mistakes

One common mistake is not closing connections when they're no longer needed. This can lead to resource leaks and potentially degrade the performance of your Memcached server.

FAQs

1. Is it necessary to call quit or shutdown every time after using Memcached?

It's not strictly necessary, but it's a good practice to follow. It helps in preventing resource leaks and ensures that your application doesn't hold onto more connections than it needs.