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<article id="post-java/lombok基础" class="article article-type-post" itemscope="" itemprop="blogPost">
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<a href="/2019/05/09/java/lombok基础/" class="article-date">
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<a class="article-title" href="/2019/05/09/java/lombok基础/">lombok的基础使用</a>
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<p>#简介<br>Lombok 是一种 Java™ 实用工具，可用来帮助开发人员消除 Java 的冗长，尤其是对于简单的 Java 对象（POJO）。它通过注解实现这一目的。<br><img src="https://i.loli.net/2019/05/09/5cd3d204b23dc.jpeg" alt="title"><br>上图是 Lombok 处理流程，在Javac 解析成抽象语法树之后(AST), Lombok 根据自己的注解处理器，动态的修改 AST，增加新的节点(所谓代码)，最终通过分析和生成字节码。</p>
<h1 id="Data-重要"><a href="#Data-重要" class="headerlink" title="@Data(重要)"></a>@Data(重要)</h1><p>这个注解相当于下面注解组合:</p>
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<li>@ToString 生成toString方法</li>
<li>@EqualsAndHashCode 生成Equals和HashCode</li>
<li>@Getter 所有字段的Getter</li>
<li>@Setter on all non-final fields 非final字段get方法</li>
<li>@RequiredArgsConstructor final字段很nonnull字段生成构造器</li>
</ul>
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<article id="post-java/ThreadLocal 源码" class="article article-type-post" itemscope="" itemprop="blogPost">
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<a class="article-title" href="/2019/04/26/java/ThreadLocal 源码/">ThreadLocal 源码解读</a>
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<!-- Table of Contents -->
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<h2 id="结构"><a href="#结构" class="headerlink" title="结构"></a>结构</h2><p>threadloca是一个钥匙,不同的线程拿这个钥匙找到不同的内容<br><img src="https://i.loli.net/2019/04/26/5cc2c951ce9a6.jpg" alt="title"></p>
<p>##ThreadLocal<br>get和set方法都很简单<br><figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br></pre></td><td class="code"><pre><span class="line">public T get() {</span><br><span class="line"> Thread t = Thread.currentThread(); // 当前线程实例</span><br><span class="line"> ThreadLocalMap map = getMap(t); // 从当前线程实例中拿到 map</span><br><span class="line"> if (map != null) {</span><br><span class="line"> ThreadLocalMap.Entry e = map.getEntry(this); // 把threadlocal自己作为key去拿值</span><br><span class="line"> if (e != null) {</span><br><span class="line"> @SuppressWarnings("unchecked")</span><br><span class="line"> T result = (T)e.value;</span><br><span class="line"> return result;</span><br><span class="line"> }</span><br><span class="line"> }</span><br><span class="line"> return setInitialValue();</span><br><span class="line">}</span><br></pre></td></tr></table></figure></p>
<p>set<br><figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br></pre></td><td class="code"><pre><span class="line">public void set(T value) {</span><br><span class="line"> Thread t = Thread.currentThread(); // 当前线程实例</span><br><span class="line"> ThreadLocalMap map = getMap(t); // 从当前线程实例中拿到 map</span><br><span class="line"> if (map != null)</span><br><span class="line"> map.set(this, value);// 把threadlocal自己作为key设置</span><br><span class="line"> else</span><br><span class="line"> createMap(t, value);</span><br><span class="line"> }</span><br></pre></td></tr></table></figure></p>
<h2 id="ThreadLocalMap"><a href="#ThreadLocalMap" class="headerlink" title="ThreadLocalMap"></a>ThreadLocalMap</h2><p>不能不提这个map是什么?他类似hashmap的实现<br><img src="https://i.loli.net/2019/04/26/5cc2c98c30ee3.jpg" alt="title"></p>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">private Entry[] table; // WeakReference是个弱引用,threadlocal引用</span><br></pre></td></tr></table></figure>
<p>###0x61c88647<br>那么这个”map”的hashcode如何产生的?0x61c88647神奇之数*n,n是产生的theadlocal实例个数.就这么简单</p>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br></pre></td><td class="code"><pre><span class="line">private final int threadLocalHashCode = nextHashCode(); // 新的hashcode</span><br><span class="line"></span><br><span class="line">private static AtomicInteger nextHashCode = new AtomicInteger(); // 计数</span><br><span class="line"></span><br><span class="line">private static final int HASH_INCREMENT = 0x61c88647; //神奇之数</span><br><span class="line"></span><br><span class="line">// 计数 * 神奇之数</span><br><span class="line">private static int nextHashCode() {</span><br><span class="line"> return nextHashCode.getAndAdd(HASH_INCREMENT);</span><br><span class="line"> }</span><br></pre></td></tr></table></figure>
<p>而且这个数很神奇,他的均匀性很好<br>那么我们验证一下这个这个神奇之数?<br><figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br></pre></td><td class="code"><pre><span class="line">private static int magicNum = 0x61c88647;</span><br><span class="line">public static void generateKey(int count) {</span><br><span class="line"> for (int i = 0; i < count; i++) {</span><br><span class="line"> int key = magicNum * i & (count-1); //分散到32位置</span><br><span class="line"> System.out.print(key+"-");</span><br><span class="line"> }</span><br><span class="line"> }</span><br></pre></td></tr></table></figure></p>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br></pre></td><td class="code"><pre><span class="line">generateKey(32);</span><br><span class="line">0-7-14-21-28-3-10-17-24-31-6-13-20-27-2-9-16-23-30-5-12-19-26-1-8-15-22-29-4-11-18-25-</span><br></pre></td></tr></table></figure>
<p>没有碰撞!!!!</p>
<h3 id="碰撞如何处理"><a href="#碰撞如何处理" class="headerlink" title="碰撞如何处理"></a>碰撞如何处理</h3><p>开放地址法,当前hashcode计算的index有值了,那我就找下一个,下一个有值再一下一个.一直循环.<br>删除比较麻烦.<br><figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br></pre></td><td class="code"><pre><span class="line">private static int nextIndex(int i, int len) {</span><br><span class="line"> return ((i + 1 < len) ? i + 1 : 0);</span><br><span class="line">}</span><br></pre></td></tr></table></figure></p>
<h3 id="添加删除"><a href="#添加删除" class="headerlink" title="添加删除"></a>添加删除</h3><p>添加<br><figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br></pre></td><td class="code"><pre><span class="line">for (Entry e = tab[i]; //开始条件</span><br><span class="line"> e != null;//运行条件</span><br><span class="line"> e = tab[i = nextIndex(i, len)])// 下一个迭代内容 {</span><br><span class="line"> ThreadLocal<?> k = e.get();</span><br><span class="line"> // key 存在，直接覆盖</span><br><span class="line"> if (k == key) {</span><br><span class="line"> e.value = value;</span><br><span class="line"> return;</span><br><span class="line"> }</span><br><span class="line"> // key == null，但是存在值（因为此处的e != null），说明之前的ThreadLocal对象已经被回收了</span><br><span class="line"> if (k == null) {</span><br><span class="line"> replaceStaleEntry(key, value, i);</span><br><span class="line"> return;</span><br><span class="line"> }</span><br><span class="line">}</span><br><span class="line">// ThreadLocal对应的key实例不存在也没有陈旧元素，new 一个</span><br><span class="line">tab[i] = new ThreadLocal.ThreadLocalMap.Entry(key, value);</span><br></pre></td></tr></table></figure></p>
<p>删除<br>python采用了假的删除,删除位置加空的标记.(好像是这样的)java采用了移动<br><figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br></pre></td><td class="code"><pre><span class="line">private void remove(ThreadLocal<?> key) {</span><br><span class="line"> Entry[] tab = table;</span><br><span class="line"> int len = tab.length;</span><br><span class="line"> int i = key.threadLocalHashCode & (len-1);</span><br><span class="line"> // 从hash值计算出来的index开始找第一个非空的entry</span><br><span class="line"> for (Entry e = tab[i];</span><br><span class="line"> e != null; </span><br><span class="line"> e = tab[i = nextIndex(i, len)]) {</span><br><span class="line"> if (e.get() == key) {</span><br><span class="line"> e.clear();//弱引用释放</span><br><span class="line"> expungeStaleEntry(i); // 清空key value 上移 hashcode碰撞的entry到清空位置</span><br><span class="line"> return;</span><br><span class="line"> }</span><br><span class="line"> }</span><br><span class="line">}</span><br></pre></td></tr></table></figure></p>
<p>expungeStaleEntry清理移动<br><figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br></pre></td><td class="code"><pre><span class="line">private int expungeStaleEntry(int staleSlot) {</span><br><span class="line"> // staleSlot被删除的entry的index</span><br><span class="line"> Entry[] tab = table;</span><br><span class="line"> int len = tab.length;</span><br><span class="line"></span><br><span class="line"> // 将entry值清空</span><br><span class="line"> tab[staleSlot].value = null;</span><br><span class="line"> tab[staleSlot] = null;</span><br><span class="line"> size--;</span><br><span class="line"></span><br><span class="line"> // 调整节点直到遇到 null</span><br><span class="line"> Entry e;</span><br><span class="line"> int i;</span><br><span class="line"> for (i = nextIndex(staleSlot, len); // 从删除的下一个节点开始 </span><br><span class="line"> (e = tab[i]) != null;// 不为空下进行</span><br><span class="line"> i = nextIndex(i, len)) {</span><br><span class="line"> ThreadLocal<?> k = e.get();</span><br><span class="line"> if (k == null) { // key空则回收 </span><br><span class="line"> e.value = null;</span><br><span class="line"> tab[i] = null;</span><br><span class="line"> size--;</span><br><span class="line"> } else {</span><br><span class="line"> int h = k.threadLocalHashCode & (len - 1);//当前index 是否是hashcode就算出来的index?意思是以前有没有hash碰撞.</span><br><span class="line"> if (h != i) {//以前hash碰撞过</span><br><span class="line"> tab[i] = null;</span><br><span class="line"> </span><br><span class="line"> while (tab[h] != null) //移动到哪里?找一个空的 格子</span><br><span class="line"> h = nextIndex(h, len);</span><br><span class="line"> tab[h] = e; 还原回去</span><br><span class="line"> }</span><br><span class="line"> }</span><br><span class="line"> }</span><br><span class="line"> return i;</span><br><span class="line">}</span><br></pre></td></tr></table></figure></p>
<p>理解不了?看图<br><img src="https://i.loli.net/2019/04/26/5cc2ca1097c18.jpg" alt="title"><br>假设有绿红黄三种threadlocal他们hashcode&(len-1)计算后的index为3,5,6.<br>因为hash冲突,key2,key5分别被放入槽4,7中<br>现在我们删除key2:<br>expungeStaleEntry中staleSlot为4,</p>
<ul>
<li>1 那么tab[4]=null,e.value清空槽和entry中的值</li>
<li>2 for开始从下一个槽,即5槽开始,逐个一个对非空entry进行处理,碰到null跳出</li>
<li>3 显然5,6槽的k.threadLocalHashCode & (len - 1)出的h和index相同的,他们没有hash冲突,没有下移</li>
<li>4 7槽 h=3 而当前index为7不相等,所以他要向上移动</li>
<li>5 移动到哪里?从h=3爱开始(hash不冲突的位置出发),找一个空位置,tab[h] = e设置回去</li>
</ul>
<h3 id="扩容resize"><a href="#扩容resize" class="headerlink" title="扩容resize"></a>扩容resize</h3><p>扩容比较简单resize<br>重新计算k.threadLocalHashCode & (newLen - 1)放入相应的位置</p>
<h2 id="优化FastThreadLocal"><a href="#优化FastThreadLocal" class="headerlink" title="优化FastThreadLocal"></a>优化FastThreadLocal</h2><p>一般threadlocal作为”钥匙”,必然是 static的.不然释放了其他类就拿不到里面的value.那么不需要像hashmap那样new 对象动态计算分配槽位.直接给个index就好了.这样取用就不需要频繁hash了,也不要移来移去了.</p>
<p>netty中的FastThreadLocal就采用了这样设计,用固定的index代替hash.<br><figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br></pre></td><td class="code"><pre><span class="line">uses a constant index in an array, instead of using hash code and hash table,</span><br><span class="line"> to look for a variable.</span><br></pre></td></tr></table></figure></p>
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<article id="post-java/spring/spring 内置容器启动" class="article article-type-post" itemscope="" itemprop="blogPost">
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<a class="article-title" href="/2019/04/25/java/spring/spring 内置容器启动/">spring 内置容器启动</a>
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<!-- Table of Contents -->
<p>[TOC]</p>
<h2 id="spring定义"><a href="#spring定义" class="headerlink" title="spring定义"></a>spring定义</h2><p>什么是spring?用一句或者几句话描述?<br>spring框架提供了一个容器,这个容器内包含有一些实例化以及初始化好的javaBean,这些bean处理好相互依赖的关系.或者未实例化初始化的BeanDefinition.围绕这些beanDefinition注册和bean获得,容器提供一些扩展如BeanFactoryPostProcessor主要负责beanDefinition的修改,BeanPostProcessor负责bean的实例化,初始化前后的处理.</p>
<p><img src="https://i.loli.net/2019/04/26/5cc2cc43866fb.png" alt="test"></p>
<h2 id="beanFactoruPostProcessor"><a href="#beanFactoruPostProcessor" class="headerlink" title="beanFactoruPostProcessor"></a>beanFactoruPostProcessor</h2><p>在bean factory实例化结束,所有的bean 定义记载完成.允许deanDefinition甚至提早实例化bean<br>PropertyPlaceholderConfigurer</p>
<h2 id="beanPostProcessor"><a href="#beanPostProcessor" class="headerlink" title="beanPostProcessor"></a>beanPostProcessor</h2><p><img src="https://leanote.com/api/file/getImage?fileId=5c9305a0ab6441495d00054d" alt="title"></p>
<p>BeanPostProcessor</p>
<p>postProcessBeforeInitialization 初始化前扩展(执行init-method前)<br>postProcessAfterInitialization 初始化后扩展(执行init-method后)<br>InstantiationAwareBeanPostProcessor</p>
<p>postProcessBeforeInstantiation 对象实例化前扩展<br>postProcessAfterInstantiation 对象实例化后扩展<br>postProcessPropertyValues 属性依赖注入前扩展<br>SmartInstantiationAwareBeanPostProcessor</p>
<p>predictBeanType 预测bean的类型，在beanFactory的getType时被调用<br>determineCandidateConstructors 对象实例化时决定要使用的构造函数时被调用<br>getEarlyBeanReference 循环依赖处理时获取Early对象引用时被调用</p>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br></pre></td><td class="code"><pre><span class="line">1 BFPP postBPP ---invokeBeanFactoryPostProcessors </span><br><span class="line">2 IABPP before (InstantiationAwareBeanPostProcessor) --createBean</span><br><span class="line">3 bean 反射调用构造方法 实例化</span><br><span class="line">4 MBPP (MergedBeanDefinitionPostProcessor) 加载 属性定义</span><br><span class="line">5 populateBean 设置属性</span><br><span class="line"> 5.1 IABPP after</span><br><span class="line"> 5.2 IABPP setproperty</span><br><span class="line"> 5.3 applyPropertyValues </span><br><span class="line">6 initializeBean 初始化</span><br><span class="line"> 6.1 invokeAwareMethods</span><br><span class="line"> 6.2 bpp before</span><br><span class="line"> 6.3 InitializingBean.afterPropertiesSet (接口InitializingBean)</span><br><span class="line"> 6.4 initMethodName @bean init-method</span><br><span class="line"> 6.5 bpp after (aop)</span><br><span class="line">7 SmartInitializingSingleton</span><br><span class="line">8 dispose</span><br><span class="line">9 destory-method</span><br></pre></td></tr></table></figure>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br><span class="line">38</span><br><span class="line">39</span><br></pre></td><td class="code"><pre><span class="line">public ConfigurableApplicationContext run(String... args) {</span><br><span class="line">StopWatch stopWatch = new StopWatch(); // 记录启动的时间</span><br><span class="line">stopWatch.start(); </span><br><span class="line">ConfigurableApplicationContext context = null;</span><br><span class="line">Collection<SpringBootExceptionReporter> exceptionReporters = new ArrayList<>();</span><br><span class="line">configureHeadlessProperty(); // 环境变量设置</span><br><span class="line">SpringApplicationRunListeners listeners = getRunListeners(args);</span><br><span class="line">listeners.starting();</span><br><span class="line">try {</span><br><span class="line"> ApplicationArguments applicationArguments = new DefaultApplicationArguments(args); // 将驱动参数包装成参数类</span><br><span class="line"> ConfigurableEnvironment environment = prepareEnvironment(listeners,</span><br><span class="line"> applicationArguments);</span><br><span class="line"> configureIgnoreBeanInfo(environment);</span><br><span class="line"> Banner printedBanner = printBanner(environment);</span><br><span class="line"> // 默认创建 AnnotationConfigServletWebServerApplicationContext</span><br><span class="line"> // 创建应用上下文，并实例化了其三个属性：reader、scanner和beanFactory</span><br><span class="line"> context = createApplicationContext(); </span><br><span class="line"> exceptionReporters = getSpringFactoriesInstances(</span><br><span class="line"> SpringBootExceptionReporter.class,</span><br><span class="line"> new Class[] { ConfigurableApplicationContext.class }, context); // 异常处器</span><br><span class="line"> prepareContext(context, environment, listeners, applicationArguments,</span><br><span class="line"> printedBanner); // 准备上下文环境</span><br><span class="line"> refreshContext(context); // 见启动过程简述2</span><br><span class="line"> afterRefresh(context, applicationArguments);</span><br><span class="line"> stopWatch.stop();</span><br><span class="line"> if (this.logStartupInfo) {</span><br><span class="line"> new StartupInfoLogger(this.mainApplicationClass)</span><br><span class="line"> .logStarted(getApplicationLog(), stopWatch);</span><br><span class="line"> }</span><br><span class="line"> listeners.started(context);</span><br><span class="line"> callRunners(context, applicationArguments);</span><br><span class="line">}</span><br><span class="line">catch (Throwable ex) {</span><br><span class="line"> handleRunFailure(context, listeners, exceptionReporters, ex);</span><br><span class="line"> throw new IllegalStateException(ex);</span><br><span class="line">}</span><br><span class="line">listeners.running(context);</span><br><span class="line">return context;</span><br><span class="line">}</span><br></pre></td></tr></table></figure>
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<article id="post-java/线程池ThreadPoolExecutor 源码解读" class="article article-type-post" itemscope="" itemprop="blogPost">
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<p>[TOC]</p>
<h2 id="ThreadPoolExecutor-入参"><a href="#ThreadPoolExecutor-入参" class="headerlink" title="ThreadPoolExecutor 入参"></a>ThreadPoolExecutor 入参</h2><figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">int</span> corePoolSize,</span><br><span class="line"><span class="keyword">int</span> maximumPoolSize,</span><br><span class="line"><span class="keyword">long</span> keepAliveTime,</span><br><span class="line">TimeUnit unit,</span><br><span class="line">BlockingQueue<Runnable> workQueue,</span><br><span class="line">ThreadFactory threadFactory,</span><br><span class="line">RejectedExecutionHandler handler</span><br></pre></td></tr></table></figure>
<ul>
<li>corePoolSize： 核心线程数，核心线程不会被杀死，除非设置允许allowCoreThreadTimeOut＝true</li>
<li>maximumPoolSize: 线程的最大线程数目</li>
<li>keepAliveTime: 线程保活时间 从阻塞队列中获取ｔａｓｋ的超过这个时间时候，线程会被杀死</li>
<li>unit： 时间单位</li>
<li>workQueue： 阻塞队列 可以无长队列 定长队列 零长队列</li>
<li>ThreadFactory： 线程工厂，典型使用，设置线程为守护线程，让线程池随着主线程退出</li>
<li>handler： 加入队列失败的策略主要有四种，CallerRunsPolicy（让主线执行任务），AbortPolicy（程序直接抛出异常），DiscardPolicy（默默的抛弃当前任务），DiscardOldestPolicy（抛弃最老的任务）
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<article id="post-java/spring/spring restTemplate" class="article article-type-post" itemscope="" itemprop="blogPost">
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<a class="article-title" href="/2018/07/25/java/spring/spring restTemplate/">spring restTemplate 提交multipart/from-data 请求</a>
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<h1 id="基础简介"><a href="#基础简介" class="headerlink" title="基础简介"></a>基础简介</h1><p>是把不同的媒体类型(如图片,json等)放在一个表单中,提交.<br>报文结构大体如下<br><figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br></pre></td><td class="code"><pre><span class="line">总的header内容(说明了分隔标志) </span><br><span class="line">-----内容分隔标志</span><br><span class="line">分块的头1</span><br><span class="line">内容1</span><br><span class="line">-----内容分隔标志</span><br><span class="line">分块的头2</span><br><span class="line">内容2</span><br><span class="line">-----内容分隔标志</span><br></pre></td></tr></table></figure></p>
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<time datetime="2018-07-22T16:00:00.000Z" itemprop="datePublished">2018-07-23</time>
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<p>@EnableAutoConfiguration启用时候</p>
<ol>
<li><p><code>Spring Boot</code>在启动时扫描项目classpath中JAR包，寻找包含<code>spring.factories</code>文件的JAR包 加载需要自动加载configure </p>
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<li><p>EnableAutoConfigurationImportSelector.selectImports根据beanconditon*过滤不符合条件的configure。</p>
</li>
<li><p>ConfigurationClassParser.processImports处理加载configure到spring容器</p>
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<a class="article-title" href="/2018/03/14/java/kafka/kafka命令行/">kafka 常用命令行</a>
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<h2 id="查看消费者组"><a href="#查看消费者组" class="headerlink" title="查看消费者组:"></a>查看消费者组:</h2><p>bin/kafka-consumer-groups.sh –bootstrap-server 192.168.137.51:9092 –list</p>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br></pre></td><td class="code"><pre><span class="line">console-consumer-70781</span><br><span class="line">console-consumer-19936</span><br><span class="line">test</span><br></pre></td></tr></table></figure>
<p>其中test是默认的消费者组</p>
<p>console-consumer 是命令行控制台 的消费者组.每次新启动一个命令行消费者,同时会创建一个消费者组.所以命令行消费者不会竞争消费.<br>
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<p>[toc]</p>
<h1 id="结论"><a href="#结论" class="headerlink" title="结论"></a>结论</h1><p>类的加载:</p>
<p>1）创建类的实例，也就是new一个对象 </p>
<p>2）访问某个类或接口的静态变量，或者对该静态变量赋值 </p>
<p>3）调用类的静态方法 </p>
<p>4）反射（Class.forName(“com.lyj.load”)） </p>
<p>5）初始化一个类的子类（会首先初始化子类的父类） </p>
<p>6）JVM启动时标明的启动类，即文件名和类名相同的那个类</p>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br></pre></td><td class="code"><pre><span class="line"></span><br><span class="line">父类静态变量 父类静态块(只执行一次)</span><br><span class="line"></span><br><span class="line">子类静态变量 子类静态块(只执行一次)</span><br><span class="line"></span><br><span class="line">父类变量 父类块</span><br><span class="line"></span><br><span class="line">父类构造器</span><br><span class="line"></span><br><span class="line">子类变量 子类块</span><br><span class="line"></span><br><span class="line">子类构造器</span><br></pre></td></tr></table></figure>
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<h1 id="1-基础环境"><a href="#1-基础环境" class="headerlink" title="1 基础环境"></a>1 基础环境</h1><h3 id="添加一个非root管理员"><a href="#添加一个非root管理员" class="headerlink" title="添加一个非root管理员"></a>添加一个非root管理员</h3><figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br></pre></td><td class="code"><pre><span class="line">useradd -m jin</span><br><span class="line">passwd jin</span><br><span class="line"># 添加sudo权限</span><br><span class="line">chmod u+w /etc/sudoers</span><br><span class="line">vim /etc/sudoers</span><br><span class="line">chmod u-w /etc/sudoers</span><br></pre></td></tr></table></figure>
<p>允许ssh登陆<br>
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<p># debezium 配置</p>
<h1 id="mysql配置"><a href="#mysql配置" class="headerlink" title="mysql配置"></a>mysql配置</h1><figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br></pre></td><td class="code"><pre><span class="line">[mysqld]</span><br><span class="line">server-id=1</span><br><span class="line">log_bin=mysql-bin</span><br><span class="line">binlog_format=row</span><br><span class="line">binlog_row_image=full</span><br></pre></td></tr></table></figure>
<p>创建一个用户</p>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br></pre></td><td class="code"><pre><span class="line"></span><br><span class="line">CREATE USER 'debezium'@'%' IDENTIFIED BY 'Ku1LsgVs5XLN';</span><br><span class="line">GRANT SELECT, RELOAD, SHOW DATABASES, REPLICATION SLAVE, REPLICATION CLIENT ON *.* TO 'debezium' IDENTIFIED BY 'Ku1LsgVs5XLN';</span><br><span class="line">flush privileges;</span><br></pre></td></tr></table></figure>
<h2 id="debezium-配置"><a href="#debezium-配置" class="headerlink" title="debezium 配置"></a>debezium 配置</h2><ul>
<li>下载 conflution官网下载社区版 tar.gz<br><a href="https://www.confluent.io/download/" target="_blank" rel="noopener">https://www.confluent.io/download/</a></li>
</ul>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br></pre></td><td class="code"><pre><span class="line">./bin/confluent start schema-registry</span><br><span class="line">-----------------------------------------</span><br><span class="line">$ ./bin/zookeeper-server-start ./etc/kafka/zookeeper.properties</span><br><span class="line">$ ./bin/kafka-server-start ./etc/kafka/server.properties</span><br><span class="line">$ ./bin/schema-registry-start ./etc/schema-registry/schema-registry.properties</span><br></pre></td></tr></table></figure>
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