{"id":37490,"date":"2023-12-11T14:41:40","date_gmt":"2023-12-11T06:41:40","guid":{"rendered":"https:\/\/wx.kaifamiao.info\/?p=37490"},"modified":"2023-12-11T14:41:40","modified_gmt":"2023-12-11T06:41:40","slug":"threadlocal-%e5%86%85%e5%ad%98%e6%b3%84%e9%9c%b2%e9%97%ae%e9%a2%98%ef%bc%9f","status":"publish","type":"post","link":"http:\/\/wx.kaifamiao.info\/index.php\/2023\/12\/11\/threadlocal-%e5%86%85%e5%ad%98%e6%b3%84%e9%9c%b2%e9%97%ae%e9%a2%98%ef%bc%9f\/","title":{"rendered":"ThreadLocal \u5185\u5b58\u6cc4\u9732\u95ee\u9898\uff1f"},"content":{"rendered":"<p>&#8220;`&#8221;                    ThreadLocalMap<code>\u4e2d\u4f7f\u7528\u7684 key \u4e3a<\/code>ThreadLocal<code>\u7684\u5f31\u5f15\u7528,\u800c value \u662f\u5f3a\u5f15\u7528\u3002\u6240\u4ee5\uff0c\u5982\u679c<\/code>ThreadLocal<code>\u6ca1\u6709\u88ab\u5916\u90e8\u5f3a\u5f15\u7528\u7684\u60c5\u51b5\u4e0b\uff0c\u5728\u5783\u573e\u56de\u6536\u7684\u65f6\u5019\u4f1a key \u4f1a\u88ab\u6e05\u7406\u6389\uff0c\u800c value \u4e0d\u4f1a\u88ab\u6e05\u7406\u6389\u3002\u8fd9\u6837\u4e00\u6765\uff0c<\/code>ThreadLocalMap<code>\u4e2d\u5c31\u4f1a\u51fa\u73b0key\u4e3anull\u7684Entry\u3002\u5047\u5982\u6211\u4eec\u4e0d\u505a\u4efb\u4f55\u63aa\u65bd\u7684\u8bdd\uff0cvalue \u6c38\u8fdc\u65e0\u6cd5\u88abGC \u56de\u6536\uff0c\u8fd9\u4e2a\u65f6\u5019\u5c31\u53ef\u80fd\u4f1a\u4ea7\u751f\u5185\u5b58\u6cc4\u9732\u3002ThreadLocalMap\u5b9e\u73b0\u4e2d\u5df2\u7ecf\u8003\u8651\u4e86\u8fd9\u79cd\u60c5\u51b5\uff0c\u5728\u8c03\u7528<\/code>set()<code>\u3001<\/code>get()<code>\u3001<\/code>remove()<code>\u65b9\u6cd5\u7684\u65f6\u5019\uff0c\u4f1a\u6e05\u7406\u6389 key \u4e3a null \u7684\u8bb0\u5f55\u3002\u4f7f\u7528\u5b8c<\/code>ThreadLocal<code>\u65b9\u6cd5\u540e \u6700\u597d\u624b\u52a8\u8c03\u7528<\/code>remove()`\u65b9\u6cd5<\/p>\n<pre><code>      static class Entry extends WeakReference&lt;ThreadLocal&lt;?&gt;&gt; {            \/** The value associated with this ThreadLocal. *\/            Object value;            Entry(ThreadLocal&lt;?&gt; k, Object v) {                super(k);                value = v;            }        }<\/code><\/pre>\n<p><strong>\u5f31\u5f15\u7528\u4ecb\u7ecd\uff1a<\/strong><\/p>\n<blockquote>\n<p>\u5982\u679c\u4e00\u4e2a\u5bf9\u8c61\u53ea\u5177\u6709\u5f31\u5f15\u7528\uff0c\u90a3\u5c31\u7c7b\u4f3c\u4e8e<strong>\u53ef\u6709\u53ef\u65e0\u7684\u751f\u6d3b\u7528\u54c1<\/strong>\u3002\u5f31\u5f15\u7528\u4e0e\u8f6f\u5f15\u7528\u7684\u533a\u522b\u5728\u4e8e\uff1a\u53ea\u5177\u6709\u5f31\u5f15\u7528\u7684\u5bf9\u8c61\u62e5\u6709\u66f4\u77ed\u6682\u7684\u751f\u547d\u5468\u671f\u3002\u5728\u5783\u573e\u56de\u6536\u5668\u7ebf\u7a0b\u626b\u63cf\u5b83 \u6240\u7ba1\u8f96\u7684\u5185\u5b58\u533a\u57df\u7684\u8fc7\u7a0b\u4e2d\uff0c\u4e00\u65e6\u53d1\u73b0\u4e86\u53ea\u5177\u6709\u5f31\u5f15\u7528\u7684\u5bf9\u8c61\uff0c\u4e0d\u7ba1\u5f53\u524d\u5185\u5b58\u7a7a\u95f4\u8db3\u591f\u4e0e\u5426\uff0c\u90fd\u4f1a\u56de\u6536\u5b83\u7684\u5185\u5b58\u3002\u4e0d\u8fc7\uff0c\u7531\u4e8e\u5783\u573e\u56de\u6536\u5668\u662f\u4e00\u4e2a\u4f18\u5148\u7ea7\u5f88\u4f4e\u7684\u7ebf\u7a0b\uff0c \u56e0\u6b64\u4e0d\u4e00\u5b9a\u4f1a\u5f88\u5feb\u53d1\u73b0\u90a3\u4e9b\u53ea\u5177\u6709\u5f31\u5f15\u7528\u7684\u5bf9\u8c61\u3002<\/p>\n<p>\u5f31\u5f15\u7528\u53ef\u4ee5\u548c\u4e00\u4e2a\u5f15\u7528\u961f\u5217\uff08ReferenceQueue\uff09\u8054\u5408\u4f7f\u7528\uff0c\u5982\u679c\u5f31\u5f15\u7528\u6240\u5f15\u7528\u7684\u5bf9\u8c61\u88ab\u5783\u573e\u56de\u6536\uff0cJava\u865a\u62df\u673a\u5c31\u4f1a\u628a\u8fd9\u4e2a\u5f31\u5f15\u7528\u52a0\u5165\u5230\u4e0e\u4e4b\u5173\u8054\u7684\u5f15\u7528\u961f\u5217\u4e2d\u3002<\/p>\n<\/blockquote>\n<pre><code>            \"```\n<\/code><\/pre>\n","protected":false},"excerpt":{"rendered":"<p>&#8220;`&#8221; ThreadLocalMap\u4e2d\u4f7f\u7528\u7684 key \u4e3aThreadLocal\u7684\u5f31\u5f15\u7528 [&hellip;]<\/p>\n","protected":false},"author":7,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[101],"tags":[],"class_list":["post-37490","post","type-post","status-publish","format-standard","hentry","category-c"],"_links":{"self":[{"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/posts\/37490","targetHints":{"allow":["GET"]}}],"collection":[{"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/users\/7"}],"replies":[{"embeddable":true,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/comments?post=37490"}],"version-history":[{"count":1,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/posts\/37490\/revisions"}],"predecessor-version":[{"id":37491,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/posts\/37490\/revisions\/37491"}],"wp:attachment":[{"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/media?parent=37490"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/categories?post=37490"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/tags?post=37490"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}