Examples of java.util.concurrent.atomic.AtomicInteger

java.util.concurrent.atomic.AtomicInteger
GWT emulated version of {@link AtomicInteger}. It's a thin wrapper around the primitive {@code int}. @author Hayward Chan

    if (occurrences == 0) {
      return count(element);
    }
    checkArgument(
        occurrences > 0, "occurrences cannot be negative: %s", occurrences);
    AtomicInteger frequency = backingMap.get(element);
    int oldCount;
    if (frequency == null) {
      oldCount = 0;
      backingMap.put(element, new AtomicInteger(occurrences));
    } else {
      oldCount = frequency.get();
      long newCount = (long) oldCount + (long) occurrences;
      checkArgument(newCount <= Integer.MAX_VALUE,
          "too many occurrences: %s", newCount);
      frequency.getAndAdd(occurrences);
    }
    size += occurrences;
    return oldCount;
  }

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    if (occurrences == 0) {
      return count(element);
    }
    checkArgument(
        occurrences > 0, "occurrences cannot be negative: %s", occurrences);
    AtomicInteger frequency = backingMap.get(element);
    if (frequency == null) {
      return 0;
    }


    int oldCount = frequency.get();


    int numberRemoved;
    if (oldCount > occurrences) {
      numberRemoved = occurrences;
    } else {
      numberRemoved = oldCount;
      backingMap.remove(element);
    }


    frequency.addAndGet(-numberRemoved);
    size -= numberRemoved;
    return oldCount;
  }

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  // Roughly a 33% performance improvement over AbstractMultiset.setCount().
  @Override public int setCount(E element, int count) {
    checkNonnegative(count, "count");


    AtomicInteger existingCounter;
    int oldCount;
    if (count == 0) {
      existingCounter = backingMap.remove(element);
      oldCount = getAndSet(existingCounter, count);
    } else {
      existingCounter = backingMap.get(element);
      oldCount = getAndSet(existingCounter, count);


      if (existingCounter == null) {
        backingMap.put(element, new AtomicInteger(count));
      }
    }


    size += (count - oldCount);
    return oldCount;

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    return i.getAndSet(count);
  }


  private int removeAllOccurrences(@Nullable Object element,
      Map<E, AtomicInteger> map) {
    AtomicInteger frequency = map.remove(element);
    if (frequency == null) {
      return 0;
    }
    int numberRemoved = frequency.getAndSet(0);
    size -= numberRemoved;
    return numberRemoved;
  }

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          }
          @Override
          public int getCount() {
            int count = mapEntry.getValue().get();
            if (count == 0) {
              AtomicInteger frequency = backingMap.get(getElement());
              if (frequency != null) {
                count = frequency.get();
              }
            }
            return count;
          }
        };

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    }
  }


  @Override public int count(@Nullable Object element) {
    try {
      AtomicInteger frequency = backingMap.get(element);
      return (frequency == null) ? 0 : frequency.get();
    } catch (NullPointerException e) {
      return 0;
    } catch (ClassCastException e) {
      return 0;
    }

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    if (occurrences == 0) {
      return count(element);
    }
    checkArgument(
        occurrences > 0, "occurrences cannot be negative: %s", occurrences);
    AtomicInteger frequency = backingMap.get(element);
    int oldCount;
    if (frequency == null) {
      oldCount = 0;
      backingMap.put(element, new AtomicInteger(occurrences));
    } else {
      oldCount = frequency.get();
      long newCount = (long) oldCount + (long) occurrences;
      checkArgument(newCount <= Integer.MAX_VALUE,
          "too many occurrences: %s", newCount);
      frequency.getAndAdd(occurrences);
    }
    size += occurrences;
    return oldCount;
  }

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    if (occurrences == 0) {
      return count(element);
    }
    checkArgument(
        occurrences > 0, "occurrences cannot be negative: %s", occurrences);
    AtomicInteger frequency = backingMap.get(element);
    if (frequency == null) {
      return 0;
    }


    int oldCount = frequency.get();


    int numberRemoved;
    if (oldCount > occurrences) {
      numberRemoved = occurrences;
    } else {
      numberRemoved = oldCount;
      backingMap.remove(element);
    }


    frequency.addAndGet(-numberRemoved);
    size -= numberRemoved;
    return oldCount;
  }

View Full Code Here


  // Roughly a 33% performance improvement over AbstractMultiset.setCount().
  @Override public int setCount(E element, int count) {
    checkNonnegative(count, "count");


    AtomicInteger existingCounter;
    int oldCount;
    if (count == 0) {
      existingCounter = backingMap.remove(element);
      oldCount = getAndSet(existingCounter, count);
    } else {
      existingCounter = backingMap.get(element);
      oldCount = getAndSet(existingCounter, count);


      if (existingCounter == null) {
        backingMap.put(element, new AtomicInteger(count));
      }
    }


    size += (count - oldCount);
    return oldCount;

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    return i.getAndSet(count);
  }


  private int removeAllOccurrences(@Nullable Object element,
      Map<E, AtomicInteger> map) {
    AtomicInteger frequency = map.remove(element);
    if (frequency == null) {
      return 0;
    }
    int numberRemoved = frequency.getAndSet(0);
    size -= numberRemoved;
    return numberRemoved;
  }

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