RFR 8005704: Update ConcurrentHashMap to v8

Martin Buchholz martinrb at google.com
Tue May 28 20:03:01 UTC 2013

A long-returning size method seems like a framework-level decision.  We
could add a default method to Collection.java and Map.java

default long mappingCount() { return size(); }

I'm not sure mappingCount is the best name, but all names will be
confusing.  Using the name "length()" at least has an onomatopoeic mnemonic
advantage - it suggests that it might return a long.

     * Returns the number of mappings. This method should be used
     * instead of {@link #size} because a ConcurrentHashMap may
     * contain more mappings than can be represented as an int. The
     * value returned is an estimate; the actual count may differ if
     * there are concurrent insertions or removals.
     * @return the number of mappings
    public long mappingCount() {
        long n = sumCount();
        return (n < 0L) ? 0L : n; // ignore transient negative values

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