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< > BotCompany Repo | #1035367 // EphemeralObjectIDs - gives objects a temporary ID to reference them (using a weak reference)

JavaX fragment (include) [tags: use-pretranspiled]

Libraryless. Click here for Pure Java version (10231L/57K).

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// ID 0 represents a null reference
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// From there we count upwards. IDs are not reused when an object is GCed
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sclass EphemeralObjectIDs {
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  long idCounter;
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  new WeakValueMap<Long, O> idToObject;
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  Map<O, Long> objectToID = weakIdentityMap();
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  selfType runnablesReferenceQueue(RunnablesReferenceQueue queue)  {
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    idToObject.queue(queue);
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    this;
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  }
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  synchronized long remember(O o) {
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    if (o == null) ret 0;
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    try object objectToID.get(o);
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    long id = ++idCounter;
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    idToObject.put(id, o);
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    objectToID.put(o, id);
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    ret id;
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  }
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  synchronized O get(long id) {
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    if (id == 0) null;
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    ret idToObject.get(id);
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  }
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  synchronized bool wasGarbageCollected(long id) {
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    ret id > 0 && id <= idCounter && get(id) == null;
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  }
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}

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Snippet ID: #1035367
Snippet name: EphemeralObjectIDs - gives objects a temporary ID to reference them (using a weak reference)
Eternal ID of this version: #1035367/5
Text MD5: 6d1359e692c0b15d83888401622da04a
Transpilation MD5: d456038002644810c653d74f877bd2b0
Author: stefan
Category: javax
Type: JavaX fragment (include)
Public (visible to everyone): Yes
Archived (hidden from active list): No
Created/modified: 2022-05-02 18:20:18
Source code size: 786 bytes / 30 lines
Pitched / IR pitched: No / No
Views / Downloads: 123 / 209
Version history: 4 change(s)
Referenced in: [show references]