caching - Concurrent Cache in Java -

-

suppose have multiple threads accessing map (actions are: inserting, retrieving, removing), , i'm using concurrenthashmap, need else or concurrenthashmap 'covers' me?
there still 'bad' can happen?

because not know all scenarios of task, according have described, imho concurrenthashmap sufficient.


Comments

Post a Comment

Popular posts from this blog

javascript - Image onload event not firing in firefox -

-
i'm creating image preloader. works fine in browsers except firefox (testing firefox 10.0). input array of images called image_list . these images appended dynamically body of document , load callback attached, calls function update_progress . code follows: $(image_list).each(function() { var x = $('<img />') .load(function() {update_progress(percent_loaded += step);}) .attr('src', this) .appendto('body') .css('display', 'none'); .each(function() { if(this.complete) update_progress(percent_loaded += step); }); }); in firefox, load callback , update_progress never called. yet exact same code works fine in chrome , other browsers i've tested. there way detect when image has loaded in firefox? i first check see whether image has height, checking height property. if (the_image.height > 0) { // image loaded (possibly cached) } if have cached ...
Read more

ios - AVAssetExportSession ignoring videoComposition rotation & stripping metadata -

-
i attempting rotate video prior upload on ios device because other platforms (such android) not interpret rotation information in ios-recorded videos and, result, play them improperly rotated. i have looked @ following stack posts have not had success apply of them case: ios rotate every frame of video rotating video w/ avmutablevideocompositionlayerinstruction avmutablevideocomposition rotated video captured in portrait mode ios avfoundation: setting orientation of video i coped apple avsimpleeditor project sample, unfortunately ever happens is, upon creating avassetexportsession , calling exportasynchronouslywithcompletionhandler, no rotation performed, , what's worse, rotation metadata stripped out of resulting file. here code runs export: avassetexportsession *exportsession = [[avassetexportsession alloc] initwithasset:[_mutablecomposition copy] presetname:avassetexportpresetpassthrough]; exportsession.outputurl = outputurl; exportsession.outputfiletype = ...
Read more

database connection - ImportError: No localization support for language 'eng' in python -

-
i getting importerror: no localization support language 'eng' when using mysql connector python. traceback below. traceback (most recent call last): file \"db_module.py\", line 151, in querydatabase file \"\\share\app\modules\mysql\connector\__init__.py\", line 44, in connect file \"\\share\app\modules\mysql\connector\connection.py\", line 106, in __init__ file \"\\share\app\modules\mysql\connector\connection.py\", line 325, in connect file \"\\share\app\modules\mysql\connector\connection.py\", line 288, in _open_connection file \"\\share\app\modules\mysql\connector\network.py\", line 326, in open_connection file \"\\sfs\show_time\showtime_package\showtime\modules\mysql\connector\errors.py\", line 160, in __init__ file \"\\share\app\modules\mysql\connector\locales\__init__.py\", line 52, in get_client_error importerror: no localization support language 'eng' and curr...
Read more