Class ConcurrentCache<K,V>

java.lang.Object
org.apache.tomcat.util.collections.ConcurrentCache<K,V>
Type Parameters:
K - the key type
V - the value type
public final class ConcurrentCache<K,V> extends Object
A thread-safe cache that uses an eden space backed by a ConcurrentHashMap and a long-term space backed by a WeakHashMap. When the eden space exceeds the configured size, its contents are promoted to the long-term space.

  • Constructor Details

    • ConcurrentCache

      public ConcurrentCache(int size)
      Creates a new cache with the specified eden space size.
      Parameters:
      size - the maximum size of the eden space before promotion to long-term storage

  • Method Details

    • get

      public V get(K k)
      Retrieves a value from the cache. If found in the long-term store, it is promoted to the eden space for faster subsequent access.
      Parameters:
      k - the key to look up
      Returns:
      the cached value, or null if not found

    • put

      public void put(K k, V v)
      Stores a value in the cache. If the eden space is full, all eden entries are promoted to the long-term store before adding the new entry.
      Parameters:
      k - the key
      v - the value to cache