Package io.github.jhipster.security

Class PersistentTokenCache<T>

  • public class PersistentTokenCache<T>
extends Object
    Simple time-limited cache for login tokens, necessary to avoid concurrent requests invalidating one another. It uses a LinkedHashMap to keep the tokens in order of expiration. During access any entries which have expired are automatically purged.

    • Constructor Detail

      • PersistentTokenCache

        public PersistentTokenCache​(long expireMillis)
        Construct a new TokenCache.
        Parameters:
        expireMillis - Delay until tokens expire, in millis.
        Throws:
        IllegalArgumentException - if expireMillis is non-positive.

    • Method Detail

      • get

        public T get​(String key)
        Get a token from the cache.
        Parameters:
        key - The key to look for.
        Returns:
        The token, if present and not yet expired, or null otherwise.

      • put

        public void put​(String key,
                T token)
        Put a token in the cache. If a token already exists for the given key, it is replaced.
        Parameters:
        key - The key to insert for.
        token - The token to insert.

      • size

        public int size()
        Get the number of tokens in the cache. Note, this may include expired tokens, unless purge() is invoked first.
        Returns:
        The size of the cache.

      • purge

        public void purge()
        Remove expired entries from the map. This will be called automatically before read/write access, but could be manually invoked if desired.