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Clarify BloomFilter.put return value under concurrency #8597

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12 changes: 7 additions & 5 deletions guava/src/com/google/common/hash/BloomFilter.java
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Original file line number Diff line number Diff line change
Expand Up @@ -187,11 +187,13 @@ public boolean test(@ParametricNullness T input) {
* Puts an element into this {@code BloomFilter}. Ensures that subsequent invocations of {@link
* #mightContain(Object)} with the same element will always return {@code true}.
*
* @return true if the Bloom filter's bits changed as a result of this operation. If the bits
* changed, this is <i>definitely</i> the first time {@code object} has been added to the
* filter. If the bits haven't changed, this <i>might</i> be the first time {@code object} has
* been added to the filter. Note that {@code put(t)} always returns the <i>opposite</i>
* result to what {@code mightContain(t)} would have returned at the time it is called.
* @return true if the Bloom filter's bits changed as a result of this operation. In the absence
* of concurrent calls to {@code put}, if the bits changed, this is <i>definitely</i> the first
* time {@code object} has been added to the filter. If the bits haven't changed, this
* <i>might</i> be the first time {@code object} has been added to the filter. Note that, in the
* absence of concurrent calls to {@code put}, {@code put(t)} always returns the
* <i>opposite</i> result to what {@code mightContain(t)} would have returned at the time it is
* called. With concurrent calls, multiple calls may return true for the same object.
* @since 12.0 (present in 11.0 with {@code void} return type})
*/
@CanIgnoreReturnValue
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