org.optaplanner.core.impl.heuristic.selector.entity.decorator

## Class AbstractCachingEntitySelector

- java.lang.Object
- - org.optaplanner.core.impl.heuristic.selector.AbstractSelector
  - - org.optaplanner.core.impl.heuristic.selector.entity.AbstractEntitySelector
    - - org.optaplanner.core.impl.heuristic.selector.entity.decorator.AbstractCachingEntitySelector

- All Implemented Interfaces:
    Iterable<Object>, EventListener, ListIterable<Object>, SelectionCacheLifecycleListener, EntitySelector, IterableSelector<Object>, ListIterableSelector<Object>, Selector, PhaseLifecycleListener, SolverLifecycleListener
  Direct Known Subclasses:
    CachingEntitySelector, ShufflingEntitySelector, SortingEntitySelector

      public abstract class AbstractCachingEntitySelector
      extends AbstractEntitySelector
      implements SelectionCacheLifecycleListener

- - ### Field Summary

    Fields
    Modifier and Type | Field and Description
    --- | ---
    `protected List<Object>` | `cachedEntityList`
    `protected SelectionCacheType` | `cacheType`
    `protected EntitySelector` | `childEntitySelector`

    - ### Fields inherited from class org.optaplanner.core.impl.heuristic.selector.AbstractSelector

      `logger, phaseLifecycleSupport, workingRandom`

  - ### Constructor Summary

    Constructors
    Constructor and Description
    `AbstractCachingEntitySelector(EntitySelector childEntitySelector, SelectionCacheType cacheType)`

  - ### Method Summary

    All Methods Instance Methods Concrete Methods
    Modifier and Type | Method and Description
    --- | ---
    `void` | `constructCache(DefaultSolverScope solverScope)`
    `void` | `disposeCache(DefaultSolverScope solverScope)`
    `Iterator<Object>` | `endingIterator()` If `Selector.isNeverEnding()` is true, then `Iterable.iterator()` will never end.
    `SelectionCacheType` | `getCacheType()` Unless this selector itself caches, this returns `SelectionCacheType.JUST_IN_TIME`, even if a selector child caches.
    `EntitySelector` | `getChildEntitySelector()`
    `EntityDescriptor` | `getEntityDescriptor()`
    `long` | `getSize()` A random JIT `Selector` with `Selector.isNeverEnding()` true should return a size as if it would be able to return each distinct element only once, because the size can be used in `SelectionProbabilityWeightFactory`.
    `boolean` | `isCountable()` If false, then `Selector.isNeverEnding()` is true.

    - ### Methods inherited from class org.optaplanner.core.impl.heuristic.selector.AbstractSelector

      `phaseEnded, phaseStarted, solvingEnded, solvingStarted, stepEnded, stepStarted`

    - ### Methods inherited from class java.lang.Object

      `clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

    - ### Methods inherited from interface org.optaplanner.core.impl.heuristic.selector.Selector

      `isNeverEnding`

    - ### Methods inherited from interface org.optaplanner.core.impl.phase.event.PhaseLifecycleListener

      `phaseEnded, phaseStarted, stepEnded, stepStarted`

    - ### Methods inherited from interface org.optaplanner.core.impl.solver.event.SolverLifecycleListener

      `solvingEnded, solvingStarted`

    - ### Methods inherited from interface org.optaplanner.core.impl.heuristic.selector.common.iterator.ListIterable

      `listIterator, listIterator`

    - ### Methods inherited from interface java.lang.Iterable

      `forEach, iterator, spliterator`

- - ### Field Detail

    - #### childEntitySelector

          protected final EntitySelector childEntitySelector

    - #### cacheType

          protected final SelectionCacheType cacheType

    - #### cachedEntityList

          protected List<Object> cachedEntityList

  - ### Constructor Detail

    - #### AbstractCachingEntitySelector

          public AbstractCachingEntitySelector(EntitySelector childEntitySelector,
                                               SelectionCacheType cacheType)

  - ### Method Detail

    - #### getChildEntitySelector

          public EntitySelector getChildEntitySelector()

    - #### getCacheType

          public SelectionCacheType getCacheType()

      Description copied from interface: `Selector`
      Unless this selector itself caches, this returns `SelectionCacheType.JUST_IN_TIME`, even if a selector child caches.
      Specified by:
        `getCacheType` in interface `Selector`
      Overrides:
        `getCacheType` in class `AbstractSelector`
      Returns:
        never null

    - #### constructCache

          public void constructCache(DefaultSolverScope solverScope)

      Specified by:
        `constructCache` in interface `SelectionCacheLifecycleListener`

    - #### disposeCache

          public void disposeCache(DefaultSolverScope solverScope)

      Specified by:
        `disposeCache` in interface `SelectionCacheLifecycleListener`

    - #### getEntityDescriptor

          public EntityDescriptor getEntityDescriptor()

      Specified by:
        `getEntityDescriptor` in interface `EntitySelector`
      Returns:
        never null

    - #### isCountable

          public boolean isCountable()

      Description copied from interface: `Selector`
      If false, then `Selector.isNeverEnding()` is true.
      Specified by:
        `isCountable` in interface `Selector`
      Returns:
        true if all the `ValueRange`s are countable (for example a double value range between 1.2 and 1.4 is not countable)

    - #### getSize

          public long getSize()

      Description copied from interface: `IterableSelector`
      A random JIT `Selector` with `Selector.isNeverEnding()` true should return a size as if it would be able to return each distinct element only once, because the size can be used in `SelectionProbabilityWeightFactory`.
      Specified by:
        `getSize` in interface `IterableSelector<Object>`
      Returns:
        the approximate number of elements generated by this `Selector`, always `>= 0`

    - #### endingIterator

          public Iterator<Object> endingIterator()

      Description copied from interface: `EntitySelector`
      If `Selector.isNeverEnding()` is true, then `Iterable.iterator()` will never end. This returns an ending `Iterator`, that tries to match `Iterable.iterator()` as much as possible, but returns each distinct element only once and returns every element that might possibly be selected and therefore it might not respect the configuration of this `EntitySelector` entirely.
      Specified by:
        `endingIterator` in interface `EntitySelector`
      Returns:
        never null
      See Also:
        `Iterable.iterator()`

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