Path: csiph.com!v102.xanadu-bbs.net!xanadu-bbs.net!feeder.erje.net!eu.feeder.erje.net!eternal-september.org!feeder.eternal-september.org!mx02.eternal-september.org!.POSTED!not-for-mail From: Eric Sosman Newsgroups: comp.lang.java.programmer Subject: Re: Concurrency question? Date: Sat, 31 Jan 2015 15:42:37 -0500 Organization: A noiseless patient Spider Lines: 18 Message-ID: References: Mime-Version: 1.0 Content-Type: text/plain; charset=windows-1252; format=flowed Content-Transfer-Encoding: 7bit Injection-Date: Sat, 31 Jan 2015 20:42:10 +0000 (UTC) Injection-Info: mx02.eternal-september.org; posting-host="bd4e1cba8d8592bec5d5ed9e4537fbfd"; logging-data="26514"; mail-complaints-to="abuse@eternal-september.org"; posting-account="U2FsdGVkX18pfKti0IJHEcNuLD38Ah8u" User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:31.0) Gecko/20100101 Thunderbird/31.4.0 In-Reply-To: Cancel-Lock: sha1:f+sMqTQiyMsF/gcMEGSDVCiSD7w= Xref: csiph.com comp.lang.java.programmer:30974 On 1/31/2015 2:20 PM, Volker Borchert wrote: > Knute Johnson wrote: >> So I have a Map [ ... ] >> >> Do you see any holes in my logic? Any suggestions? > > java.util.concurrent.ConcurrentHashMap That's fine if the consistency criterion involves only single mappings. But if different mappings within the same Map must "agree" (in some application-dependent sense), atomicity of individual updates isn't good enough. Only Knute knows for sure ... -- esosman@comcast-dot-net.invalid "Don't be afraid of work. Make work afraid of you." -- TLM