EphemeralObjectIDs - gives objects a temporary ID to reference them (using a weak reference) [1035367]

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

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

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

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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):

Created/modified:

2022-05-02 18:20:18

Source code size:

786 bytes / 30 lines

Pitched / IR pitched:

No / No

Views / Downloads:

69 / 130

Version history:

4 change(s)

Referenced in:

[show references]

1	// ID 0 represents a null reference
2	// From there we count upwards. IDs are not reused when an object is GCed
3	sclass EphemeralObjectIDs {
4	long idCounter;
5	new WeakValueMap<Long, O> idToObject;
6	Map<O, Long> objectToID = weakIdentityMap();
7
8	selfType runnablesReferenceQueue(RunnablesReferenceQueue queue) {
9	idToObject.queue(queue);
10	this;
11	}
12
13	synchronized long remember(O o) {
14	if (o == null) ret 0;
15	try object objectToID.get(o);
16	long id = ++idCounter;
17	idToObject.put(id, o);
18	objectToID.put(o, id);
19	ret id;
20	}
21
22	synchronized O get(long id) {
23	if (id == 0) null;
24	ret idToObject.get(id);
25	}
26
27	synchronized bool wasGarbageCollected(long id) {
28	ret id > 0 && id <= idCounter && get(id) == null;
29	}
30	}