concurrentlyIterateList - wants a RandomAccessList [1012178]

< > BotCompany Repo | #1012178 // concurrentlyIterateList - wants a RandomAccessList

JavaX fragment (include)

// iterate safely (& quickly) in the face of concurrent modifications
static <A> IterableIterator<A> concurrentlyIterateList(final L<A> l) {
  ret iteratorFromFunction_withEndMarker_f0(new F0<A>() {
    int i;

    A get() {
      int _i = i++;
      synchronized(l) {
        if (_i < l(l)) {
          A a = l.get(_i);
          if (a == iteratorFromFunction_endMarker) fail("no"); // ugly comparison fail-fast redemption
          ret a;
        }
        ret (A) iteratorFromFunction_endMarker; // ugly cast
      }
    }
  });
}

Author comment

Began life as a copy of #1012173

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Snippet ID:

#1012178

Snippet name:

concurrentlyIterateList - wants a RandomAccessList

Eternal ID of this version:

#1012178/8

Text MD5:

e895be85f5c85485dfd280f84badf55b

Author:

stefan

Category:

javax / collections

Type:

JavaX fragment (include)

Public (visible to everyone):

Yes

Archived (hidden from active list):

Created/modified:

2018-07-11 13:20:21

Source code size:

550 bytes / 18 lines

Pitched / IR pitched:

No / No

Views / Downloads:

454 / 498

Version history:

7 change(s)

Referenced in:

[show references]

1	// iterate safely (& quickly) in the face of concurrent modifications
2	static <A> IterableIterator<A> concurrentlyIterateList(final L<A> l) {
3	ret iteratorFromFunction_withEndMarker_f0(new F0<A>() {
4	int i;
5
6	A get() {
7	int _i = i++;
8	synchronized(l) {
9	if (_i < l(l)) {
10	A a = l.get(_i);
11	if (a == iteratorFromFunction_endMarker) fail("no"); // ugly comparison fail-fast redemption
12	ret a;
13	}
14	ret (A) iteratorFromFunction_endMarker; // ugly cast
15	}
16	}
17	});
18	}