Package org.mockito.internal.util.concurrent

Class WeakConcurrentMap<K,​V>

  • All Implemented Interfaces:
    java.lang.Iterable<java.util.Map.Entry<K,​V>>, java.lang.Runnable
    Direct Known Subclasses:
    WeakConcurrentMap.WithInlinedExpunction
    public class WeakConcurrentMap<K,​V>
extends java.lang.ref.ReferenceQueue<K>
implements java.lang.Runnable, java.lang.Iterable<java.util.Map.Entry<K,​V>>

    A thread-safe map with weak keys. Entries are based on a key's system hash code and keys are considered equal only by reference equality.

    This class does not implement the Map interface because this implementation is incompatible with the map contract. While iterating over a map's entries, any key that has not passed iteration is referenced non-weakly.

    • Field Detail

      • ID

        private static final java.util.concurrent.atomic.AtomicLong ID

      • thread

        private final java.lang.Thread thread

    • Constructor Detail

      • WeakConcurrentMap

        public WeakConcurrentMap​(boolean cleanerThread)
        Parameters:
        cleanerThread - true if a thread should be started that removes stale entries.

    • Method Detail

      • get

        public V get​(K key)
        Parameters:
        key - The key of the entry.
        Returns:
        The value of the entry or the default value if it did not exist.

      • containsKey

        public boolean containsKey​(K key)
        Parameters:
        key - The key of the entry.
        Returns:
        true if the key already defines a value.

      • put

        public V put​(K key,
             V value)
        Parameters:
        key - The key of the entry.
        value - The value of the entry.
        Returns:
        The previous entry or null if it does not exist.

      • remove

        public V remove​(K key)
        Parameters:
        key - The key of the entry.
        Returns:
        The removed entry or null if it does not exist.

      • clear

        public void clear()
        Clears the entire map.

      • defaultValue

        protected V defaultValue​(K key)
        Creates a default value. There is no guarantee that the requested value will be set as a once it is created in case that another thread requests a value for a key concurrently.
        Parameters:
        key - The key for which to create a default value.
        Returns:
        The default value for a key without value or null for not defining a default value.

      • getCleanerThread

        public java.lang.Thread getCleanerThread()
        Returns:
        The cleaner thread or null if no such thread was set.

      • expungeStaleEntries

        public void expungeStaleEntries()
        Cleans all unused references.

      • approximateSize

        public int approximateSize()
        Returns the approximate size of this map where the returned number is at least as big as the actual number of entries.
        Returns:
        The minimum size of this map.

      • run

        public void run()
        Specified by:
        run in interface java.lang.Runnable

      • iterator

        public java.util.Iterator<java.util.Map.Entry<K,​V>> iterator()
        Specified by:
        iterator in interface java.lang.Iterable<K>