{"id":95,"date":"2023-02-14T21:58:55","date_gmt":"2023-02-14T13:58:55","guid":{"rendered":"https:\/\/www.appblog.cn\/?p=95"},"modified":"2023-02-14T21:59:05","modified_gmt":"2023-02-14T13:59:05","slug":"concurrenthashmap-size","status":"publish","type":"post","link":"https:\/\/www.appblog.cn\/index.php\/2023\/02\/14\/concurrenthashmap-size\/","title":{"rendered":"ConcurrentHashMap\u7684size\u64cd\u4f5c"},"content":{"rendered":"<p>\u5982\u679c\u6211\u4eec\u8981\u7edf\u8ba1\u6574\u4e2a<code>ConcurrentHashMap<\/code>\u91cc\u5143\u7d20\u7684\u5927\u5c0f\uff0c\u5c31\u5fc5\u987b\u7edf\u8ba1\u6240\u6709<code>Segment<\/code>\u91cc\u5143\u7d20\u7684\u5927\u5c0f\u540e\u6c42\u548c\u3002<code>Segment<\/code>\u91cc\u7684\u5168\u5c40\u53d8\u91cfcount\u662f\u4e00\u4e2a<code>volatile<\/code>\u53d8\u91cf\uff0c\u90a3\u4e48\u5728\u591a\u7ebf\u7a0b\u573a\u666f\u4e0b\uff0c\u6211\u4eec\u662f\u4e0d\u662f\u76f4\u63a5\u628a\u6240\u6709<code>Segment<\/code>\u7684count\u76f8\u52a0\u5c31\u53ef\u4ee5\u5f97\u5230\u6574\u4e2a<code>ConcurrentHashMap<\/code>\u5927\u5c0f\u4e86\u5462\uff1f\u4e0d\u662f\u7684\uff0c\u867d\u7136\u76f8\u52a0\u65f6\u53ef\u4ee5\u83b7\u53d6\u6bcf\u4e2a<code>Segment<\/code>\u7684count\u7684\u6700\u65b0\u503c\uff0c\u4f46\u662f\u62ff\u5230\u4e4b\u540e\u53ef\u80fd\u7d2f\u52a0\u524d\u4f7f\u7528\u7684count\u53d1\u751f\u4e86\u53d8\u5316\uff0c\u90a3\u4e48\u7edf\u8ba1\u7ed3\u679c\u5c31\u4e0d\u51c6\u4e86\u3002\u6240\u4ee5\u6700\u5b89\u5168\u7684\u505a\u6cd5\uff0c\u662f\u5728\u7edf\u8ba1size\u7684\u65f6\u5019\u628a\u6240\u6709<code>Segment<\/code>\u7684<code>put<\/code>\uff0c<code>remove<\/code>\u548c<code>clean<\/code>\u65b9\u6cd5\u5168\u90e8\u9501\u4f4f\uff0c\u4f46\u662f\u8fd9\u79cd\u505a\u6cd5\u663e\u7136\u975e\u5e38\u4f4e\u6548\u3002<\/p>\n<p>\u56e0\u4e3a\u5728\u7d2f\u52a0count\u64cd\u4f5c\u8fc7\u7a0b\u4e2d\uff0c\u4e4b\u524d\u7d2f\u52a0\u8fc7\u7684count\u53d1\u751f\u53d8\u5316\u7684\u51e0\u7387\u975e\u5e38\u5c0f\uff0c\u6240\u4ee5<code>ConcurrentHashMap<\/code>\u7684\u505a\u6cd5\u662f\u5148\u5c1d\u8bd52\u6b21\u901a\u8fc7\u4e0d\u9501\u4f4f<code>Segment<\/code>\u7684\u65b9\u5f0f\u6765\u7edf\u8ba1\u5404\u4e2a<code>Segment<\/code>\u5927\u5c0f\uff0c\u5982\u679c\u7edf\u8ba1\u7684\u8fc7\u7a0b\u4e2d\uff0c\u5bb9\u5668\u7684count\u53d1\u751f\u4e86\u53d8\u5316\uff0c\u5219\u518d\u91c7\u7528\u5168\u90e8<code>Segment<\/code>\u52a0\u9501\u7684\u65b9\u5f0f\u6765\u7edf\u8ba1\u6240\u6709<code>Segment<\/code>\u7684\u5927\u5c0f\u3002<\/p>\n<p>\u90a3\u4e48<code>ConcurrentHashMap<\/code>\u662f\u5982\u4f55\u5224\u65ad\u5728\u7edf\u8ba1\u7684\u65f6\u5019\u5bb9\u5668\u662f\u5426\u53d1\u751f\u4e86\u53d8\u5316\u5462\uff1f\u4f7f\u7528<code>modCount<\/code>\u53d8\u91cf\uff0c\u5728<code>put<\/code>, <code>remove<\/code>\u548c<code>clean<\/code>\u65b9\u6cd5\u91cc\u64cd\u4f5c\u5143\u7d20\u524d\u90fd\u4f1a\u5c06\u53d8\u91cf<code>modCount<\/code>\u8fdb\u884c\u52a01\uff0c\u90a3\u4e48\u5728\u7edf\u8ba1size\u524d\u540e\u6bd4\u8f83<code>modCount<\/code>\u662f\u5426\u53d1\u751f\u53d8\u5316\uff0c\u4ece\u800c\u5f97\u77e5\u5bb9\u5668\u7684\u5927\u5c0f\u662f\u5426\u53d1\u751f\u53d8\u5316\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u5982\u679c\u6211\u4eec\u8981\u7edf\u8ba1\u6574\u4e2aConcurrentHashMap\u91cc\u5143\u7d20\u7684\u5927\u5c0f\uff0c\u5c31\u5fc5\u987b\u7edf\u8ba1\u6240\u6709Segment\u91cc\u5143\u7d20\u7684\u5927\u5c0f\u540e\u6c42 [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[43],"tags":[],"class_list":["post-95","post","type-post","status-publish","format-standard","hentry","category-java-basic"],"_links":{"self":[{"href":"https:\/\/www.appblog.cn\/index.php\/wp-json\/wp\/v2\/posts\/95","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.appblog.cn\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.appblog.cn\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.appblog.cn\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.appblog.cn\/index.php\/wp-json\/wp\/v2\/comments?post=95"}],"version-history":[{"count":0,"href":"https:\/\/www.appblog.cn\/index.php\/wp-json\/wp\/v2\/posts\/95\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.appblog.cn\/index.php\/wp-json\/wp\/v2\/media?parent=95"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.appblog.cn\/index.php\/wp-json\/wp\/v2\/categories?post=95"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.appblog.cn\/index.php\/wp-json\/wp\/v2\/tags?post=95"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}