Created
November 27, 2018 03:54
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スレッドセーフな連想カウンタをリセットしたい人生だった ref: https://qiita.com/piyo7/items/81d1d395733b3cea072c
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val counter = TrieMap[Key, LongAdder]() |
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counter.getOrElseUpdate(key, new LongAdder()).increment() |
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for (key <- counter.keys) { | |
val sum = counter.remove(key).sum() | |
logger.debug(s"$key: $sum") | |
} |
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for { | |
key <- counter.keys | |
value <- counter.get(key) | |
} { | |
val sum = value.sumThenReset() | |
logger.debug(s"$key: $sum") | |
} |
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val counter = TrieMap[Key, AtomicLong]() |
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for { | |
key <- counter.keys | |
value <- counter.get(key) | |
} { | |
val v = value.getAndSet(0) | |
logger.debug(s"$key: $v") | |
} |
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for { | |
key <- counter.keys | |
value <- counter.get(key) | |
} { | |
val v = value.get() | |
if (v == 0) counter.remove(key) | |
} |
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scala> new AtomicLong(0) == new AtomicLong(0) | |
res0: Boolean = false |
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public final class AtomicLongMap<K> implements Serializable { | |
private final ConcurrentHashMap<K, Long> map; |
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public final class AtomicLongMap<K> { | |
private final ConcurrentHashMap<K, AtomicLong> map; |
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