add operation in Memcached is commonly used to add a new key-value pair into the cache, but only if the server doesn't already hold data for this key. It can be useful in scenarios where you want to prevent overwriting existing data in the cache.
Here is a simple example of adding a key-value pair to Memcached using the spymemcached client library in Java:
In this example, we're creating a connection to a Memcached server running on localhost at port 11211. We then attempt to add a new key-value pair ("key" and "value"). The second parameter
3600 is the expiry time for this key-value pair in seconds. If the data is added successfully, "Data added successfully" will be printed; otherwise, "Failed to add data" will be printed.
addoperation was successful. It's not guaranteed to be successful every time, as it depends on the current state of the cache.
addmethod returns a Future object that holds the result of the operation. Ignoring this return value could lead to problems in your code, as you won't be able to handle failures properly.
Q: What happens if I try to add a key-value pair that already exists in the cache?
add operation will not overwrite existing key-value pairs. If the key already exists in the cache, the operation will simply fail and return false.
Q: How can I make sure my data is added to Memcached successfully?
A: You should always check the boolean result returned by the
add method to confirm if your data was added successfully.