utils/src/main/java/jetbrains/exodus/core/dataStructures/LongObjectCache.java [224:243]:
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            firstGenIterator = cache.firstGenerationQueue.values().iterator();
            secondGenIterator = cache.secondGenerationQueue.values().iterator();
        }

        @Override
        public boolean hasNext() {
            return firstGenIterator.hasNext() || secondGenIterator.hasNext();
        }

        @Override
        public V next() {
            return (firstGenIterator.hasNext()) ? firstGenIterator.next() : secondGenIterator.next();
        }

        @Override
        public void remove() {
            if (firstGenIterator.hasNext()) {
                firstGenIterator.remove();
            } else {
                secondGenIterator.remove();
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utils/src/main/java/jetbrains/exodus/core/dataStructures/ObjectCache.java [214:233]:
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            firstGenIterator = cache.firstGenerationQueue.values().iterator();
            secondGenIterator = cache.secondGenerationQueue.values().iterator();
        }

        @Override
        public boolean hasNext() {
            return firstGenIterator.hasNext() || secondGenIterator.hasNext();
        }

        @Override
        public V next() {
            return (firstGenIterator.hasNext()) ? firstGenIterator.next() : secondGenIterator.next();
        }

        @Override
        public void remove() {
            if (firstGenIterator.hasNext()) {
                firstGenIterator.remove();
            } else {
                secondGenIterator.remove();
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