Package com.tangosol.util

Class AbstractSafeLongArray.SafeIterator

  • All Implemented Interfaces:
    LongArray.Iterator<V>, Iterator<V>
    Enclosing class:
    AbstractSafeLongArray<V>
    protected class AbstractSafeLongArray.SafeIterator
extends Object
implements LongArray.Iterator<V>
    A lock based LongArray Iterator. Note the implementation is thread-safe so long as the wrapped unsafe LongArray supports stable iteration when accessed from a single thread. Specifically that performing an add or remove operation directly against the LongArray while being iterated does not corrupt the state of either the LongArray or the Iterator. An alternate approach would be to maintain a write counter and to refresh the delegate iterator each time the write counter changes, the refresh would be cheap as it could use iterator(m_lastIndex).

    • Constructor Summary

      Constructors 
      Modifier Constructor Description
      protected SafeIterator​(LongArray<V> delegate, boolean fForward, long lIndexFrom)  

    • Method Summary

      All Methods Instance Methods Concrete Methods 
      Modifier and Type Method Description
      protected void ensureValid()
      Ensure that the cached value/index are valid.
      long getIndex()
      Returns the index of the current value, which is the value returned by the most recent call to the next method.
      V getValue()
      Returns the current value, which is the same value returned by the most recent call to the next method, or the most recent value passed to setValue if setValue were called after the next method.
      boolean hasNext()
      Returns true if the iteration has more elements.
      V next()
      Returns the next element in the iteration.
      void remove()
      Removes from the underlying collection the last element returned by the iterator (optional operation).
      V setValue​(V oValue)
      Stores a new value at the current value index, returning the value that was replaced.

    • Field Detail

      • m_valueLast

        protected Object m_valueLast
        The last value returned from the iterator.

      • m_lIndexLast

        protected long m_lIndexLast
        The index associated with the last returned value

    • Constructor Detail

      • SafeIterator

        protected SafeIterator​(LongArray<V> delegate,
                       boolean fForward,
                       long lIndexFrom)

    • Method Detail

      • hasNext

        public boolean hasNext()
        Description copied from interface: LongArray.Iterator
        Returns true if the iteration has more elements. (In other words, returns true if next would return an element rather than throwing an exception.)
        Specified by:
        hasNext in interface Iterator<V>
        Specified by:
        hasNext in interface LongArray.Iterator<V>
        Returns:
        true if the iterator has more elements

      • getIndex

        public long getIndex()
        Description copied from interface: LongArray.Iterator
        Returns the index of the current value, which is the value returned by the most recent call to the next method.
        Specified by:
        getIndex in interface LongArray.Iterator<V>
        Returns:
        the index of the current value

      • getValue

        public V getValue()
        Description copied from interface: LongArray.Iterator
        Returns the current value, which is the same value returned by the most recent call to the next method, or the most recent value passed to setValue if setValue were called after the next method.
        Specified by:
        getValue in interface LongArray.Iterator<V>
        Returns:
        the current value

      • setValue

        public V setValue​(V oValue)
        Description copied from interface: LongArray.Iterator
        Stores a new value at the current value index, returning the value that was replaced. The index of the current value is obtainable by calling the getIndex method.
        Specified by:
        setValue in interface LongArray.Iterator<V>
        Parameters:
        oValue - the new value to store
        Returns:
        the replaced value

      • remove

        public void remove()
        Description copied from interface: LongArray.Iterator
        Removes from the underlying collection the last element returned by the iterator (optional operation). This method can be called only once per call to next. The behavior of an iterator is unspecified if the underlying collection is modified while the iteration is in progress in any way other than by calling this method.
        Specified by:
        remove in interface Iterator<V>
        Specified by:
        remove in interface LongArray.Iterator<V>

      • ensureValid

        protected void ensureValid()
        Ensure that the cached value/index are valid.