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 reaches 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. As for put(Object, Object), if the eden space is full, its contents are first moved to the long-term store so that the eden space never grows beyond the configured size.
      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