From c0765af4b24d157abc64176659c9f7b0b5e3ba62 Mon Sep 17 00:00:00 2001 From: Guide Date: Sun, 11 Jun 2023 11:12:22 +0800 Subject: [PATCH] =?UTF-8?q?[docs=20update]=E5=AE=8C=E5=96=84cdn=E9=83=A8?= =?UTF-8?q?=E5=88=86=E7=9A=84=E5=86=85=E5=AE=B9?= MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit --- docs/high-performance/cdn.md | 15 ++++++++++++--- docs/high-performance/images/cdn/cdn-101.drawio | 1 - .../images/cdn/cdn-overview.drawio | 1 - .../20-bad-habits-of-bad-programmers.md | 4 ++-- ...en-tips-for-becoming-an-advanced-programmer.md | 4 +++- .../ten-years-of-dachang-growth-road.md | 4 +++- ...-growth-strategy-of-the-technological-giant.md | 2 +- ...ology-and-business-after-five-years-of-work.md | 2 +- docs/home.md | 2 +- .../copyonwritearraylist-source-code.md | 2 +- 10 files changed, 24 insertions(+), 13 deletions(-) delete mode 100644 docs/high-performance/images/cdn/cdn-101.drawio delete mode 100644 docs/high-performance/images/cdn/cdn-overview.drawio diff --git a/docs/high-performance/cdn.md b/docs/high-performance/cdn.md index 17c6d81b..c5ffc53b 100644 --- a/docs/high-performance/cdn.md +++ b/docs/high-performance/cdn.md @@ -52,13 +52,22 @@ head: ### 静态资源是如何被缓存到 CDN 节点中的？ -你可以通过预热的方式将源站的资源同步到 CDN 的节点中。这样的话，用户首次请求资源可以直接从 CDN 节点中取，无需回源。这样可以降低源站压力，提升用户体验。 +你可以通过 **预热** 的方式将源站的资源同步到 CDN 的节点中。这样的话，用户首次请求资源可以直接从 CDN 节点中取，无需回源。这样可以降低源站压力，提升用户体验。 如果不预热的话，你访问的资源可能不在 CDN 节点中，这个时候 CDN 节点将请求源站获取资源，这个过程是大家经常说的 **回源**。 -**命中率** 和 **回源率** 是衡量 CDN 服务质量两个重要指标。命中率越高越好，回源率越低越好。 +> - 回源：当 CDN 节点上没有用户请求的资源或该资源的缓存已经过期时，CDN 节点需要从原始服务器获取最新的资源内容，这个过程就是回源。当用户请求发生回源的话，会导致该请求的响应速度比未使用 CDN 还慢，因为相比于未使用 CDN 还多了一层 CDN 的调用流程。 +> - 预热：预热是指在 CDN 上提前将内容缓存到 CDN 节点上。这样当用户在请求这些资源时，能够快速地从最近的 CDN 节点获取到而不需要回源，进而减少了对源站的访问压力，提高了访问速度。 -如果资源有更新的话，你也可以对其 **刷新** ，删除 CDN 节点上缓存的资源，当用户访问对应的资源时直接回源获取最新的资源，并重新缓存。 +![CDN 回源](https://oss.javaguide.cn/github/javaguide/high-performance/cdn/cdn-back-to-source.png) + +如果资源有更新的话，你也可以对其 **刷新** ，删除 CDN 节点上缓存的旧资源，并强制 CDN 节点回源站获取最新资源。 + +几乎所有云厂商提供的 CDN 服务都具备缓存的刷新和预热功能（下图是阿里云 CDN 服务提供的相应功能）： + +![CDN 缓存的刷新和预热](https://oss.javaguide.cn/github/javaguide/high-performance/cdn/cdn-refresh-warm-up.png) + +**命中率** 和 **回源率** 是衡量 CDN 服务质量两个重要指标。命中率越高越好，回源率越低越好。 ### 如何找到最合适的 CDN 节点？ diff --git a/docs/high-performance/images/cdn/cdn-101.drawio b/docs/high-performance/images/cdn/cdn-101.drawio deleted file mode 100644 index 87e4159b..00000000 --- a/docs/high-performance/images/cdn/cdn-101.drawio +++ /dev/null @@ -1 +0,0 @@ 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\ No newline at end of file diff --git a/docs/high-performance/images/cdn/cdn-overview.drawio b/docs/high-performance/images/cdn/cdn-overview.drawio deleted file mode 100644 index 4cf6f698..00000000 --- a/docs/high-performance/images/cdn/cdn-overview.drawio +++ /dev/null @@ -1 +0,0 @@ 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 \ No newline at end of file diff --git a/docs/high-quality-technical-articles/advanced-programmer/20-bad-habits-of-bad-programmers.md b/docs/high-quality-technical-articles/advanced-programmer/20-bad-habits-of-bad-programmers.md index ea47e296..bb7fb8f3 100644 --- a/docs/high-quality-technical-articles/advanced-programmer/20-bad-habits-of-bad-programmers.md +++ b/docs/high-quality-technical-articles/advanced-programmer/20-bad-habits-of-bad-programmers.md @@ -10,9 +10,9 @@ tag: > >
> -> **原文地址：** https://mp.weixin.qq.com/s/6hUU6SZsxGPWAIIByq93Rw +> **原文地址：** -我想你肯定遇到过这样一类程序员：**他们无论是写代码，还是写文档，又或是和别\*\***人沟通，都显得特别专业\*\*。每次遇到这类人，我都在想，他们到底是怎么做到的？ +我想你肯定遇到过这样一类程序员：**他们无论是写代码，还是写文档，又或是和别人沟通，都显得特别专业**。每次遇到这类人，我都在想，他们到底是怎么做到的？ 随着工作时间的增长，渐渐地我也总结出一些经验，他们身上都保持着一些看似很微小的优秀习惯，但正是因为这些习惯，体现出了一个优秀程序员的基本素养。 diff --git a/docs/high-quality-technical-articles/advanced-programmer/seven-tips-for-becoming-an-advanced-programmer.md b/docs/high-quality-technical-articles/advanced-programmer/seven-tips-for-becoming-an-advanced-programmer.md index 0dbe554e..0284e68a 100644 --- a/docs/high-quality-technical-articles/advanced-programmer/seven-tips-for-becoming-an-advanced-programmer.md +++ b/docs/high-quality-technical-articles/advanced-programmer/seven-tips-for-becoming-an-advanced-programmer.md @@ -8,6 +8,8 @@ tag: > **推荐语**：普通程序员要想成长为高级程序员甚至是专家等更高级别，应该注意在哪些方面注意加强？开发内功修炼号主飞哥在这篇文章中就给出了七条实用的建议。 > +>
+> > **内容概览**： > > 1. 刻意加强需求评审能力 @@ -18,7 +20,7 @@ tag: > 6. 关注全局 > 7. 归纳总结能力 > -> **原文地址**：https://mp.weixin.qq.com/s/8lMGzBzXine-NAsqEaIE4g +> **原文地址**： ### 建议 1：刻意加强需求评审能力 diff --git a/docs/high-quality-technical-articles/advanced-programmer/ten-years-of-dachang-growth-road.md b/docs/high-quality-technical-articles/advanced-programmer/ten-years-of-dachang-growth-road.md index 5c3d3f9c..8a69e8f5 100644 --- a/docs/high-quality-technical-articles/advanced-programmer/ten-years-of-dachang-growth-road.md +++ b/docs/high-quality-technical-articles/advanced-programmer/ten-years-of-dachang-growth-road.md @@ -6,7 +6,9 @@ tag: - 练级攻略 --- -> **推荐语**：这篇文章的作者有着丰富的工作经验，曾在大厂工作了 12 年。结合自己走过的弯路和接触过的优秀技术人，他总结出了一些对于个人成长具有普遍指导意义的经验和特质 +> **推荐语**：这篇文章的作者有着丰富的工作经验，曾在大厂工作了 12 年。结合自己走过的弯路和接触过的优秀技术人，他总结出了一些对于个人成长具有普遍指导意义的经验和特质。 +> +>
> > **原文地址：** diff --git a/docs/high-quality-technical-articles/advanced-programmer/the-growth-strategy-of-the-technological-giant.md b/docs/high-quality-technical-articles/advanced-programmer/the-growth-strategy-of-the-technological-giant.md index c3acee32..19822da6 100644 --- a/docs/high-quality-technical-articles/advanced-programmer/the-growth-strategy-of-the-technological-giant.md +++ b/docs/high-quality-technical-articles/advanced-programmer/the-growth-strategy-of-the-technological-giant.md @@ -10,7 +10,7 @@ tag: > >
> -> **原文地址：** https://mp.weixin.qq.com/s/YrN8T67s801-MRo01lCHXA +> **原文地址：** ## 1. 前言 diff --git a/docs/high-quality-technical-articles/advanced-programmer/thinking-about-technology-and-business-after-five-years-of-work.md b/docs/high-quality-technical-articles/advanced-programmer/thinking-about-technology-and-business-after-five-years-of-work.md index fb3fcec5..a35672c2 100644 --- a/docs/high-quality-technical-articles/advanced-programmer/thinking-about-technology-and-business-after-five-years-of-work.md +++ b/docs/high-quality-technical-articles/advanced-programmer/thinking-about-technology-and-business-after-five-years-of-work.md @@ -10,7 +10,7 @@ tag: > >
> -> **原文地址：** https://mp.weixin.qq.com/s/CTbEdi0F4-qFoJT05kNlXA +> **原文地址：** 苦海无边，回头无岸。 diff --git a/docs/home.md b/docs/home.md index 5a7093ec..999a995f 100644 --- a/docs/home.md +++ b/docs/home.md @@ -1,6 +1,6 @@ --- icon: creative -title: JavaGuide（Java学习&&面试指南） +title: JavaGuide（Java学习&面试指南） --- ::: tip 友情提示 diff --git a/docs/java/collection/copyonwritearraylist-source-code.md b/docs/java/collection/copyonwritearraylist-source-code.md index e8e57ba2..9741a87c 100644 --- a/docs/java/collection/copyonwritearraylist-source-code.md +++ b/docs/java/collection/copyonwritearraylist-source-code.md @@ -129,7 +129,7 @@ public boolean add(E e) { 从上面的源码可以看出： -- `add`方法内部用到了 `ReentrantLock` 加锁，保证了同步，避免了多线程写的时候会复制出多个副本出来。 +- `add`方法内部用到了 `ReentrantLock` 加锁，保证了同步，避免了多线程写的时候会复制出多个副本出来。锁被修饰保证了锁的内存地址肯定不会被修改，并且，释放锁的逻辑放在 `finally` 中，可以保证锁能被释放。 - `CopyOnWriteArrayList` 通过复制底层数组的方式实现写操作，即先创建一个新的数组来容纳新添加的元素，然后在新数组中进行写操作，最后将新数组赋值给底层数组的引用，替换掉旧的数组。这也就证明了我们前面说的：`CopyOnWriteArrayList` 线程安全的核心在于其采用了 **写时复制（Copy-On-Write）** 的策略。 - 每次写操作都需要通过 `Arrays.copyOf` 复制底层数组，时间复杂度是 O(n) 的，且会占用额外的内存空间。因此，`CopyOnWriteArrayList` 适用于读多写少的场景，在写操作不频繁且内存资源充足的情况下，可以提升系统的性能表现。 - `CopyOnWriteArrayList` 中并没有类似于 `ArrayList` 的 `grow()` 方法扩容的操作。