{"id":659,"date":"2019-09-13T12:56:15","date_gmt":"2019-09-13T04:56:15","guid":{"rendered":"http:\/\/prayerlaputa.com\/?p=659"},"modified":"2019-09-13T12:56:15","modified_gmt":"2019-09-13T04:56:15","slug":"%e3%80%90%e5%90%ac%e8%af%be%e7%ac%94%e8%ae%b0%e3%80%91java%e5%88%86%e5%b8%83%e5%bc%8f%e9%94%81","status":"publish","type":"post","link":"http:\/\/prayerlaputa.com\/?p=659","title":{"rendered":"\u3010\u542c\u8bfe\u7b14\u8bb0\u3011java\u5206\u5e03\u5f0f\u9501"},"content":{"rendered":"<h1>\u8bfe\u7a0b\u94fe\u63a5<\/h1>\n<div class=\"mume markdown-preview \">\n<p>\u8bfe\u7a0b:<a href=\"https:\/\/url.163.com\/VD8\">https:\/\/url.163.com\/VD8<\/a><\/p>\n<h1 id=\"java%E9%94%81\" class=\"mume-header\">java\u9501<\/h1>\n<h2 id=\"synchronized\" class=\"mume-header\">synchronized<\/h2>\n<p>\u5728jdk 1.5\u4ee5\u540e\uff0c\u4f18\u5316\u4e86\uff0c\u4f7f\u5176\u6027\u80fd\u5e76\u4e0d\u662f\u50cf\u5f88\u591a\u5e16\u5b50\u8bf4\u7684\u90a3\u6837\uff0c\u201c\u975e\u5e38\u91cd\u201d<\/p>\n<h2 id=\"juc-lock\" class=\"mume-header\">JUC lock<\/h2>\n<table>\n<thead>\n<tr>\n<th>\u65b9\u6cd5<\/th>\n<th>\u8bf4\u660e<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>lock()<\/td>\n<td>\u83b7\u53d6\u9501\uff0c\u5982\u679c\u9501\u88ab\u6682\u7528\u5219\u4e00\u76f4\u7b49\u5f85<\/td>\n<\/tr>\n<tr>\n<td>tryLock()<\/td>\n<td>\u5982\u679c\u83b7\u53d6\u9501\u7684\u65f6\u5019\u9501\u88ab\u5360\u7528\u5c31\u8fd4\u56defalse\uff0c\u5426\u5219\u8fd4\u56detrue<\/td>\n<\/tr>\n<tr>\n<td>tryLock(long time, TimeUnit unit)<\/td>\n<td>\u6bd4\u8d77tryLock\uff0c\u591a\u51fa\u7b49\u5f85\u65f6\u95f4<\/td>\n<\/tr>\n<tr>\n<td>unLock()<\/td>\n<td><\/td>\n<\/tr>\n<tr>\n<td>lockInterruptibly()<\/td>\n<td><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p><!--more--><\/p>\n<h3 id=\"lock%E4%B8%8Esynchronized%E5%8C%BA%E5%88%AB\" class=\"mume-header\">lock\u4e0esynchronized\u533a\u522b<\/h3>\n<ul>\n<li>lock\u662f\u63a5\u53e3\uff0csyn\u662fjava\u5173\u952e\u5b57\uff0c\u662f\u5185\u7f6e\u5b9e\u73b0\uff1b<\/li>\n<li>sync \u53d1\u751f\u5f02\u5e38\u65f6\u81ea\u52a8\u91ca\u653e\u7ebf\u7a0b\u5360\u6709\u7684\u9501\uff0c\u56e0\u6b64\u4e0d\u4f1a\u5bfc\u81f4\u6b7b\u9501\u73b0\u8c61\u53d1\u751f\uff1block\u5728\u53d1\u751f\u5f02\u5e38\u65f6\uff0c\u5982\u679c\u6ca1\u6709unLock\u53bb\u91ca\u653e\u9501\uff0c\u53ef\u80fd\u9020\u6210\u6b7b\u9501\u3002\u56e0\u6b64\u4f7f\u7528lock\u65f6\u9700\u8981\u5728finally\u4e2d\u91ca\u653e\u9501<\/li>\n<li>lock \u53ef\u4ee5\u8ba9\u7b49\u5f85\u9501\u7684\u7ebf\u7a0b\u54cd\u5e94\u4e2d\u65ad\uff1bsync \u4e0d\u884c\uff0c\u4f7f\u7528sync\u7b49\u5f85\u7ebf\u7a0b\u4e00\u76f4\u7b49\u5f85\u4e0b\u53bb\uff0c\u4e0d\u80fd\u4e2d\u65ad<br \/>\nlock\u53ef\u4ee5\u77e5\u9053\u6709\u6ca1\u6709\u6210\u529f\u83b7\u5f97\u9501\uff0csync\u5219\u65e0\u6cd5\u77e5\u9053<\/li>\n<li>lock\u53ef\u63d0\u9ad8\u591a\u7ebf\u7a0b\u8bfb\u6548\u7387<\/li>\n<\/ul>\n<p>\u6027\u80fd\u4e0a\uff0c\u7ade\u4e89\u4e0d\u6fc0\u70c8\uff0c\u4e24\u8005\u6027\u80fd\uff1b\u7ade\u4e89\u6fc0\u70c8\u65f6\uff0clock\u6027\u80fd\u8fdc\u7531\u4e8esync\u3002\u5177\u4f53\u9700\u8981\u6839\u636e\u60c5\u51b5\u800c\u5b9a\u3002<br \/>\n\u5e76\u4e0d\u4e00\u5b9a\u603b\u662f\u9700\u8981\u7528lock\uff0csync\u66f4\u65b9\u4fbf\uff0clock\u9700\u8981\u66f4\u7cbe\u5fc3\u7ef4\u62a4\u4ee3\u7801\u3001\u907f\u514d\u6b7b\u9501<\/p>\n<h1 id=\"%E5%88%86%E5%B8%83%E5%BC%8F%E9%94%81\" class=\"mume-header\">\u5206\u5e03\u5f0f\u9501<\/h1>\n<p>push<br \/>\npull<br \/>\n\u7684\u65b9\u5f0f<\/p>\n<p>\u60ca\u7fa4\u6548\u5e94<\/p>\n<p>\u5206\u5e03\u5f0f\u9501\u9700\u8981\u5177\u5907\u7684\u6761\u4ef6\uff1a<\/p>\n<ul>\n<li>\u4e92\u65a5\u6027<\/li>\n<li>\u53ef\u91cd\u5165<\/li>\n<li>\u8d85\u65f6\u9ad8\u6548<\/li>\n<li>\u963b\u585e\/\u975e\u963b\u585e<\/li>\n<\/ul>\n<p>\u51e0\u79cd\u5b9e\u73b0\u65b9\u5f0f\uff1a<\/p>\n<ol>\n<li>\u6570\u636e\u5e93\u5b9e\u73b0(\u4e50\u89c2\u9501)<\/li>\n<li>\u57fa\u4e8ezookeeper\u7684\u5b9e\u73b0<\/li>\n<li>\u57fa\u4e8eredis\u7684\u5b9e\u73b0<\/li>\n<li>\u81ea\u7814\u5206\u5e03\u5f0f\u9501\uff08google\u7684chubby, zookeeper\u5b9e\u9645\u4e0a\u662f\u57fa\u4e8e\u8fd9\u4e2achubby\uff09<\/li>\n<\/ol>\n<h2 id=\"%E5%9F%BA%E4%BA%8E%E6%95%B0%E6%8D%AE%E5%BA%93%E5%AE%9E%E7%8E%B0\" class=\"mume-header\">\u57fa\u4e8e\u6570\u636e\u5e93\u5b9e\u73b0<\/h2>\n<p>\u7565<\/p>\n<h2 id=\"%E5%9F%BA%E4%BA%8Eredis%E7%9A%84%E5%AE%9E%E7%8E%B0\" class=\"mume-header\">\u57fa\u4e8eredis\u7684\u5b9e\u73b0<\/h2>\n<h3 id=\"%E5%9F%BA%E6%9C%AC%E5%91%BD%E4%BB%A4\" class=\"mume-header\">\u57fa\u672c\u547d\u4ee4<\/h3>\n<pre class=\"language-\" data-role=\"codeBlock\" data-info=\"\"><code>SETNX key value   \r\n<\/code><\/pre>\n<p>if key\u4e0d\u5b58\u5728\uff0c\u5219\u8bbe\u7f6e\u4e3avalue\uff1b\u5b58\u5728\u5219\u4e0d\u505a\u4efb\u4f55\u64cd\u4f5c<br \/>\n&#8220;SET if Not eXist&#8221;<\/p>\n<pre class=\"language-\" data-role=\"codeBlock\" data-info=\"\"><code>expire key seconds \r\n<\/code><\/pre>\n<p>\u8bbe\u7f6e\u8fc7\u671f\u65f6\u95f4\uff0c\u5982\u679ckey\u5df2\u56fd\u4f01\uff0c\u5219\u5c06\u4f1a\u88ab\u81ea\u52a8\u5220\u9664\u3002<\/p>\n<pre class=\"language-\" data-role=\"codeBlock\" data-info=\"\"><code>del key\r\n<\/code><\/pre>\n<p>\u5220\u9664key<\/p>\n<h3 id=\"%E5%AE%9E%E7%8E%B0%E6%96%B9%E5%BC%8F\" class=\"mume-header\">\u5b9e\u73b0\u65b9\u5f0f<\/h3>\n<h4 id=\"%E5%9F%BA%E6%9C%AC%E9%94%81\" class=\"mume-header\">\u57fa\u672c\u9501<\/h4>\n<p>\u539f\u7406\uff1a\u5229\u7528redis\u7684setnx\uff0c\u5982\u679c\u4e0d\u5b58\u5728\u67d0\u4e2akey\u5219\u8bbe\u7f6e\u503c\uff0c\u8bbe\u7f6e\u6210\u529f\u5219\u8868\u793a\u9501\u6210\u529f<br \/>\n\u7f3a\u70b9\uff1a\u5982\u679c\u83b7\u53d6\u9501\u540e\u7684\u8fdb\u7a0b\u5728\u6ca1\u6709\u6267\u884c\u5b8c\u5c31\u6302\u4e86\uff0c\u5219\u9501\u6c38\u8fdc\u4e0d\u4f1a\u91ca\u653e<\/p>\n<h4 id=\"%E6%94%B9%E8%BF%9B%E5%9E%8B\" class=\"mume-header\">\u6539\u8fdb\u578b<\/h4>\n<p>\u6539\u8fdb\uff1a\u5728\u57fa\u672c\u5f62\u5f0f\u9501\u4e0asetnx\u540e\u8bbe\u7f6eexpire\uff0c\u4fdd\u8bc1\u8d85\u65f6\u540e\u4e5f\u80fd\u81ea\u52a8\u91ca\u653e\u9501<br \/>\n\u7f3a\u70b9\uff1asetnx\u4e0eexpire\u4e0d\u662f\u4e00\u4e2a\u539f\u5b50\u64cd\u4f5c\uff0c\u53ef\u80fd\u6267\u884c\u5b8csetnx\u8be5\u8fdb\u7a0b\u5c31\u6302\u4e86<\/p>\n<h4 id=\"%E5%86%8D%E6%94%B9%E8%BF%9B\" class=\"mume-header\">\u518d\u6539\u8fdb<\/h4>\n<p>lua\u6267\u884c\u5177\u6709\u539f\u5b50\u6027<br \/>\n\u6539\u8fdb\uff1a\u5229\u7528lua\u811a\u672c\uff0c\u5c06setnx\u4e0eexpire\u7f16\u7a0b\u4e00\u4e2a\u539f\u5b50\u64cd\u4f5c\uff0c\u53ef\u89e3\u51b3\u4e00\u90e8\u5206\u95ee\u9898<br \/>\n\u7f3a\u70b9\uff1a\u8fd8\u662f\u4f1a\u51fa\u73b0\u9501\u8fc7\u671f\u7684\u95ee\u9898<\/p>\n<h2 id=\"%E5%85%B7%E4%BD%93%E5%AE%9E%E7%8E%B0\" class=\"mume-header\">\u5177\u4f53\u5b9e\u73b0<\/h2>\n<p>\u5b98\u65b9\u63d0\u4f9b\u7684java\u7ec4\u4ef6\uff1aredisson<br \/>\nredisson\u7684\u5206\u5e03\u5f0f\u53ef\u91cd\u5165\u9501RLock java\u5bf9\u8c61\u5b9e\u73b0\u4e86java.util.concurrent.locks.lock\u63a5\u53e3\u540c\u65f6\u8fd8\u652f\u6301\u8fc7\u671f\u89e3\u9501<br \/>\n\u5730\u5740\uff1a<\/p>\n<ul>\n<li><a href=\"https:\/\/github.com\/redisson\/redisson\">redisson github<\/a><\/li>\n<li><a href=\"https:\/\/redisson.org\">redisson \u5b98\u7f51<\/a><\/li>\n<\/ul>\n<h2 id=\"%E5%88%86%E5%B8%83%E5%BC%8F%E9%94%81%E6%96%B9%E6%A1%88%E6%AF%94%E8%BE%83\" class=\"mume-header\">\u5206\u5e03\u5f0f\u9501\u65b9\u6848\u6bd4\u8f83<\/h2>\n<ul>\n<li>\u4ece\u7406\u89e3\u7684\u96be\u6613\u7a0b\u5ea6\uff08\u4ece\u4f4e\u5230\u9ad8\uff09<br \/>\n\u6570\u636e\u5e93 &gt; \u7f13\u5b58 &gt; zookeeper<\/li>\n<li>\u4ece\u5b9e\u73b0\u7684\u590d\u6742\u6027\u89d2\u5ea6<br \/>\nzookeeper &gt;= \u7f13\u5b58 &gt; \u6570\u636e<\/li>\n<li>\u4ece\u6027\u80fd\u89d2\u5ea6\uff08\u4ece\u9ad8\u5230\u5e95\uff09<br \/>\n\u7f13\u5b58 &gt; zookeeper &gt;= \u6570\u636e\u5e93<\/li>\n<li>\u4ece\u53ef\u9760\u6027\u89d2\u5ea6\uff08\u4ece\u9ad8\u5230\u4f4e\uff09<br \/>\nzookeeper &gt; \u7f13\u5b58 &gt; \u6570\u636e\u5e93<\/li>\n<\/ul>\n<h1 id=\"%E6%89%A9%E5%B1%95\" class=\"mume-header\">\u6269\u5c55<\/h1>\n<p>redis\u7684\u53ef\u4ee5\u7528\u4e8e\u54ea\u4e9b\u573a\u666f\uff1f<\/p>\n<ul>\n<li>\u7f13\u5b58<\/li>\n<li>\u6d88\u606f\u961f\u5217<\/li>\n<li>\u5206\u5e03\u5f0f\u9501<\/li>\n<li>\u53d1\u5e03\u8ba2\u9605<\/li>\n<\/ul>\n<\/div>\n<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u8bfe\u7a0b\u94fe\u63a5 \u8bfe\u7a0b:https:\/\/url.163.com\/VD8 java\u9501 synchronized \u5728jdk <a href='http:\/\/prayerlaputa.com\/?p=659' class='excerpt-more'>[&#8230;]<\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0},"categories":[6,79,80],"tags":[33,82,81],"_links":{"self":[{"href":"http:\/\/prayerlaputa.com\/index.php?rest_route=\/wp\/v2\/posts\/659"}],"collection":[{"href":"http:\/\/prayerlaputa.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/prayerlaputa.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/prayerlaputa.com\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/prayerlaputa.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=659"}],"version-history":[{"count":1,"href":"http:\/\/prayerlaputa.com\/index.php?rest_route=\/wp\/v2\/posts\/659\/revisions"}],"predecessor-version":[{"id":660,"href":"http:\/\/prayerlaputa.com\/index.php?rest_route=\/wp\/v2\/posts\/659\/revisions\/660"}],"wp:attachment":[{"href":"http:\/\/prayerlaputa.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=659"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/prayerlaputa.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=659"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/prayerlaputa.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=659"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}