Small documentation fix.
Dieser Commit ist enthalten in:
Ursprung
9f6b4b60e3
Commit
9a16143c89
@ -204,6 +204,29 @@ public class BlockingHashMap<TKey, TValue> {
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}
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}
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/**
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* If and only if a key is not present in the map will it be associated with the given value.
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* @param key - the key to associate.
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* @param value - the value to associate.
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* @return The previous value this key has been associated with.
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*/
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public TValue putIfAbsent(TKey key, TValue value) {
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if (value == null)
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throw new IllegalArgumentException("This map doesn't support NULL values.");
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final TValue previous = backingMap.putIfAbsent(key, value);
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// No need to unlock readers if we haven't changed anything
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if (previous == null) {
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final Object lock = getLock(key);
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synchronized (lock) {
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lock.notifyAll();
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}
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}
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return previous;
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}
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public int size() {
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return backingMap.size();
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}
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