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Re: [collections-dev] Question about ConcurrentHashMap
|
try putIfAbsent
Thanks
Moh
On 9/22/23 13:23, Siddharth Jain via
collections-dev wrote:
Hi,
I am using EC ConcurrentHashMap. I need a method that does
below two operations atomically:
1. returns value of a key
2. if the key is not in the dictionary (i.e., step 1
returns null) it should put a KV pair in the map.
I am trying getIfAbsentPut but it does not return the
original value in the map. I want this test to pass:
ConcurrentHashMap<String, String> map = new ConcurrentHashMap<>();
map.put("foo", "bar");
var x = map.getIfAbsentPut("spam", "eggs");
assertTrue(x == null);
is there any method that can do this for me?
S.
PS: i am looking for a behavior somewhat equivalent to
AtomicInger getAndIncrement. the get returns the original
value not the value after the operation completes.
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