Package io.atomix.client.map

Interface AsyncDistributedMap<K,V>

All Superinterfaces:
AsyncPrimitive, DistributedPrimitive
public interface AsyncDistributedMap<K,V> extends AsyncPrimitive
Asynchronous distributed map.

  • Method Details

    • size

      CompletableFuture<Integer> size()
      Returns the number of key-value mappings in this map. If the map contains more than Integer.MAX_VALUE elements, returns Integer.MAX_VALUE.
      Returns:
      the number of key-value mappings in this map

    • isEmpty

      CompletableFuture<Boolean> isEmpty()
      Returns true if this map contains no key-value mappings.
      Returns:
      true if this map contains no key-value mappings

    • containsKey

      CompletableFuture<Boolean> containsKey(K key)
      Returns true if this map contains a mapping for the specified key. More formally, returns true if and only if this map contains a mapping for a key k such that (key==null ? k==null : key.equals(k)). (There can be at most one such mapping.)
      Parameters:
      key - key whose presence in this map is to be tested
      Returns:
      true if this map contains a mapping for the specified key
      Throws:
      ClassCastException - if the key is of an inappropriate type for this map (optional)
      NullPointerException - if the specified key is null and this map does not permit null keys (optional)

    • containsValue

      CompletableFuture<Boolean> containsValue(V value)
      Returns true if this map maps one or more keys to the specified value. More formally, returns true if and only if this map contains at least one mapping to a value v such that (value==null ? v==null : value.equals(v)). This operation will probably require time linear in the map size for most implementations of the Map interface.
      Parameters:
      value - value whose presence in this map is to be tested
      Returns:
      true if this map maps one or more keys to the specified value
      Throws:
      ClassCastException - if the value is of an inappropriate type for this map (optional)
      NullPointerException - if the specified value is null and this map does not permit null values (optional)

    • get

      CompletableFuture<V> get(K key)
      Returns the value to which the specified key is mapped, or null if this map contains no mapping for the key.

      More formally, if this map contains a mapping from a key k to a value v such that (key==null ? k==null : key.equals(k)), then this method returns v; otherwise it returns null. (There can be at most one such mapping.)

      If this map permits null values, then a return value of null does not necessarily indicate that the map contains no mapping for the key; it's also possible that the map explicitly maps the key to null. The containsKey operation may be used to distinguish these two cases.

      Parameters:
      key - the key whose associated value is to be returned
      Returns:
      the value to which the specified key is mapped, or null if this map contains no mapping for the key
      Throws:
      ClassCastException - if the key is of an inappropriate type for this map (optional)
      NullPointerException - if the specified key is null and this map does not permit null keys (optional)

    • put

      CompletableFuture<V> put(K key, V value)
      Associates the specified value with the specified key in this map (optional operation). If the map previously contained a mapping for the key, the old value is replaced by the specified value. (A map m is said to contain a mapping for a key k if and only if m.containsKey(k) would return true.)
      Parameters:
      key - key with which the specified value is to be associated
      value - value to be associated with the specified key
      Returns:
      the previous value associated with key, or null if there was no mapping for key. (A null return can also indicate that the map previously associated null with key, if the implementation supports null values.)
      Throws:
      UnsupportedOperationException - if the put operation is not supported by this map
      ClassCastException - if the class of the specified key or value prevents it from being stored in this map
      NullPointerException - if the specified key or value is null and this map does not permit null keys or values
      IllegalArgumentException - if some property of the specified key or value prevents it from being stored in this map

    • remove

      CompletableFuture<V> remove(K key)
      Removes the mapping for a key from this map if it is present (optional operation). More formally, if this map contains a mapping from key k to value v such that (key==null ? k==null : key.equals(k)), that mapping is removed. (The map can contain at most one such mapping.)

      Returns the value to which this map previously associated the key, or null if the map contained no mapping for the key.

      If this map permits null values, then a return value of null does not necessarily indicate that the map contained no mapping for the key; it's also possible that the map explicitly mapped the key to null.

      The map will not contain a mapping for the specified key once the call returns.

      Parameters:
      key - key whose mapping is to be removed from the map
      Returns:
      the previous value associated with key, or null if there was no mapping for key.
      Throws:
      UnsupportedOperationException - if the remove operation is not supported by this map
      ClassCastException - if the key is of an inappropriate type for this map (optional)
      NullPointerException - if the specified key is null and this map does not permit null keys (optional)

    • putAll

      CompletableFuture<Void> putAll(Map<? extends K,? extends V> m)
      Copies all of the mappings from the specified map to this map (optional operation). The effect of this call is equivalent to that of calling put(k, v) on this map once for each mapping from key k to value v in the specified map. The behavior of this operation is undefined if the specified map is modified while the operation is in progress.
      Parameters:
      m - mappings to be stored in this map
      Throws:
      UnsupportedOperationException - if the putAll operation is not supported by this map
      ClassCastException - if the class of a key or value in the specified map prevents it from being stored in this map
      NullPointerException - if the specified map is null, or if this map does not permit null keys or values, and the specified map contains null keys or values
      IllegalArgumentException - if some property of a key or value in the specified map prevents it from being stored in this map

    • clear

      CompletableFuture<Void> clear()
      Removes all of the mappings from this map (optional operation). The map will be empty after this call returns.
      Throws:
      UnsupportedOperationException - if the clear operation is not supported by this map

    • keySet

      AsyncDistributedSet<K> keySet()
      Returns a Set view of the keys contained in this map. The set is backed by the map, so changes to the map are reflected in the set, and vice-versa. If the map is modified while an iteration over the set is in progress (except through the iterator's own remove operation), the results of the iteration are undefined. The set supports element removal, which removes the corresponding mapping from the map, via the Iterator.remove, Set.remove, removeAll, retainAll, and clear operations. It does not support the add or addAll operations.
      Returns:
      a set view of the keys contained in this map

    • values

      AsyncDistributedCollection<V> values()
      Returns a Collection view of the values contained in this map. The collection is backed by the map, so changes to the map are reflected in the collection, and vice-versa. If the map is modified while an iteration over the collection is in progress (except through the iterator's own remove operation), the results of the iteration are undefined. The collection supports element removal, which removes the corresponding mapping from the map, via the Iterator.remove, Collection.remove, removeAll, retainAll and clear operations. It does not support the add or addAll operations.
      Returns:
      a collection view of the values contained in this map

    • entrySet

      AsyncDistributedSet<Map.Entry<K,V>> entrySet()
      Returns a Set view of the mappings contained in this map. The set is backed by the map, so changes to the map are reflected in the set, and vice-versa. If the map is modified while an iteration over the set is in progress (except through the iterator's own remove operation, or through the setValue operation on a map entry returned by the iterator) the results of the iteration are undefined. The set supports element removal, which removes the corresponding mapping from the map, via the Iterator.remove, Set.remove, removeAll, retainAll and clear operations. It does not support the add or addAll operations.
      Returns:
      a set view of the mappings contained in this map

    • getOrDefault

      CompletableFuture<V> getOrDefault(K key, V defaultValue)
      Returns the value to which the specified key is mapped, or defaultValue if this map contains no mapping for the key.
      Parameters:
      key - the key whose associated value is to be returned
      defaultValue - the default mapping of the key
      Returns:
      the value to which the specified key is mapped, or defaultValue if this map contains no mapping for the key
      Throws:
      ClassCastException - if the key is of an inappropriate type for this map (optional)
      NullPointerException - if the specified key is null and this map does not permit null keys (optional)

    • putIfAbsent

      CompletableFuture<V> putIfAbsent(K key, V value)
      If the specified key is not already associated with a value (or is mapped to null) associates it with the given value and returns null, else returns the current value.
      Parameters:
      key - key with which the specified value is to be associated
      value - value to be associated with the specified key
      Returns:
      the previous value associated with the specified key, or null if there was no mapping for the key. (A null return can also indicate that the map previously associated null with the key, if the implementation supports null values.)
      Throws:
      UnsupportedOperationException - if the put operation is not supported by this map (optional)
      ClassCastException - if the key or value is of an inappropriate type for this map (optional)
      NullPointerException - if the specified key or value is null, and this map does not permit null keys or values (optional)
      IllegalArgumentException - if some property of the specified key or value prevents it from being stored in this map (optional)

    • remove

      CompletableFuture<Boolean> remove(K key, V value)
      Removes the entry for the specified key only if it is currently mapped to the specified value.
      Parameters:
      key - key with which the specified value is associated
      value - value expected to be associated with the specified key
      Returns:
      true if the value was removed
      Throws:
      UnsupportedOperationException - if the remove operation is not supported by this map (optional)
      ClassCastException - if the key or value is of an inappropriate type for this map (optional)
      NullPointerException - if the specified key or value is null, and this map does not permit null keys or values (optional)

    • replace

      CompletableFuture<Boolean> replace(K key, V oldValue, V newValue)
      Replaces the entry for the specified key only if currently mapped to the specified value.
      Parameters:
      key - key with which the specified value is associated
      oldValue - value expected to be associated with the specified key
      newValue - value to be associated with the specified key
      Returns:
      true if the value was replaced
      Throws:
      UnsupportedOperationException - if the put operation is not supported by this map (optional)
      ClassCastException - if the class of a specified key or value prevents it from being stored in this map
      NullPointerException - if a specified key or newValue is null, and this map does not permit null keys or values
      NullPointerException - if oldValue is null and this map does not permit null values (optional)
      IllegalArgumentException - if some property of a specified key or value prevents it from being stored in this map

    • replace

      CompletableFuture<V> replace(K key, V value)
      Replaces the entry for the specified key only if it is currently mapped to some value.
      Parameters:
      key - key with which the specified value is associated
      value - value to be associated with the specified key
      Returns:
      the previous value associated with the specified key, or null if there was no mapping for the key. (A null return can also indicate that the map previously associated null with the key, if the implementation supports null values.)
      Throws:
      UnsupportedOperationException - if the put operation is not supported by this map (optional)
      ClassCastException - if the class of the specified key or value prevents it from being stored in this map (optional)
      NullPointerException - if the specified key or value is null, and this map does not permit null keys or values
      IllegalArgumentException - if some property of the specified key or value prevents it from being stored in this map

    • computeIfAbsent

      CompletableFuture<V> computeIfAbsent(K key, Function<? super K,? extends V> mappingFunction)
      If the specified key is not already associated with a value (or is mapped to null), attempts to compute its value using the given mapping function and enters it into this map unless null.

      If the function returns null no mapping is recorded. If the function itself throws an (unchecked) exception, the exception is rethrown, and no mapping is recorded. The most common usage is to construct a new object serving as an initial mapped value or memoized result, as in: 

       
 map.computeIfAbsent(key, k -> new Value(f(k)));

      Or to implement a multi-value map, Map<K,Collection<V>>, supporting multiple values per key: 

       
 map.computeIfAbsent(key, k -> new HashSet<V>()).add(v);
      Parameters:
      key - key with which the specified value is to be associated
      mappingFunction - the function to compute a value
      Returns:
      the current (existing or computed) value associated with the specified key, or null if the computed value is null
      Throws:
      NullPointerException - if the specified key is null and this map does not support null keys, or the mappingFunction is null
      UnsupportedOperationException - if the put operation is not supported by this map (optional)
      ClassCastException - if the class of the specified key or value prevents it from being stored in this map (optional)

    • computeIfPresent

      CompletableFuture<V> computeIfPresent(K key, BiFunction<? super K,? super V,? extends V> remappingFunction)
      If the value for the specified key is present and non-null, attempts to compute a new mapping given the key and its current mapped value.

      If the function returns null, the mapping is removed. If the function itself throws an (unchecked) exception, the exception is rethrown, and the current mapping is left unchanged.

      Parameters:
      key - key with which the specified value is to be associated
      remappingFunction - the function to compute a value
      Returns:
      the new value associated with the specified key, or null if none
      Throws:
      NullPointerException - if the specified key is null and this map does not support null keys, or the remappingFunction is null
      UnsupportedOperationException - if the put operation is not supported by this map (optional)
      ClassCastException - if the class of the specified key or value prevents it from being stored in this map (optional)

    • compute

      CompletableFuture<V> compute(K key, BiFunction<? super K,? super V,? extends V> remappingFunction)
      Attempts to compute a mapping for the specified key and its current mapped value (or null if there is no current mapping). For example, to either create or append a String msg to a value mapping:

      If the function returns null, the mapping is removed (or remains absent if initially absent). If the function itself throws an (unchecked) exception, the exception is rethrown, and the current mapping is left unchanged.

      Parameters:
      key - key with which the specified value is to be associated
      remappingFunction - the function to compute a value
      Returns:
      the new value associated with the specified key, or null if none
      Throws:
      NullPointerException - if the specified key is null and this map does not support null keys, or the remappingFunction is null
      UnsupportedOperationException - if the put operation is not supported by this map (optional)
      ClassCastException - if the class of the specified key or value prevents it from being stored in this map (optional)

    • listen

      default CompletableFuture<Cancellable> listen(MapEventListener<K,V> listener)
      Registers the specified listener to be notified whenever the map is updated.
      Parameters:
      listener - listener to notify about map events
      Returns:
      future that will be completed when the operation finishes

    • listen

      CompletableFuture<Cancellable> listen(MapEventListener<K,V> listener, Executor executor)
      Registers the specified listener to be notified whenever the map is updated.
      Parameters:
      listener - listener to notify about map events
      executor - executor to use for handling incoming map events
      Returns:
      future that will be completed when the operation finishes

    • sync

      default DistributedMap<K,V> sync()
      Description copied from interface: AsyncPrimitive
      Returns a synchronous wrapper around the asynchronous primitive.
      Specified by:
      sync in interface AsyncPrimitive
      Returns:
      the synchronous primitive

    • sync

      DistributedMap<K,V> sync(Duration operationTimeout)
      Description copied from interface: AsyncPrimitive
      Returns a synchronous wrapper around the asynchronous primitive.
      Specified by:
      sync in interface AsyncPrimitive
      Parameters:
      operationTimeout - the synchronous operation timeout
      Returns:
      the synchronous primitive