// iterate safely (& quickly) in the face of concurrent modifications static <A, B> IterableIterator<A> concurrentlyIterateKeys(final NavigableMap<A, B> map) { ret iteratorFromFunction(new F0<A>() { Iterator<A> it = keys(map).iterator(); A key; A get() { synchronized(map) { try { if (!it.hasNext()) null; ret key = it.next(); } catch (ConcurrentModificationException e) { print("Re-iterating"); it = map.tailMap(key, false).keySet().iterator(); if (!it.hasNext()) null; ret key = it.next(); // Can't throw another exception } } } }); }
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Snippet ID: | #1012173 |
Snippet name: | concurrentlyIterateKeys - synchronizes on map |
Eternal ID of this version: | #1012173/2 |
Text MD5: | 970ac3137b5a8a1ae2ec478730a8aa00 |
Author: | stefan |
Category: | javax / collections |
Type: | JavaX fragment (include) |
Public (visible to everyone): | Yes |
Archived (hidden from active list): | No |
Created/modified: | 2018-01-08 08:49:19 |
Source code size: | 677 bytes / 21 lines |
Pitched / IR pitched: | No / No |
Views / Downloads: | 479 / 504 |
Version history: | 1 change(s) |
Referenced in: | #1006654 - Standard functions list 2 (LIVE, continuation of #761) #1012178 - concurrentlyIterateList - wants a RandomAccessList #1013140 - concurrentlyIterateSet #1013541 - concurrentlyIterateValues - synchronizes on map |