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<h2 title="类 IdWorker" class="title">类 IdWorker</h2>
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<li>java.lang.Object</li>
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<pre>public class <span class="typeNameLabel">IdWorker</span>
extends java.lang.Object</pre>
<div class="block"><p>名称：IdWorker.java</p>
<p>描述：分布式自增长ID</p>
<pre>
Twitter的 Snowflake JAVA实现方案
</pre>
核心代码为其IdWorker这个类实现，其原理结构如下，我分别用一个0表示一位，用—分割开部分的作用：
1||0---0000000000 0000000000 0000000000 0000000000 0 --- 00000 ---00000 ---000000000000
在上面的字符串中，第一位为未使用（实际上也可作为long的符号位），接下来的41位为毫秒级时间，
然后5位datacenter标识位，5位机器ID（并不算标识符，实际是为线程标识），
然后12位该毫秒内的当前毫秒内的计数，加起来刚好64位，为一个Long型。
这样的好处是，整体上按照时间自增排序，并且整个分布式系统内不会产生ID碰撞（由datacenter和机器ID作区分），
并且效率较高，经测试，snowflake每秒能够产生26万ID左右，完全满足需要。
<p>
64位ID (42(毫秒)+5(机器ID)+5(业务编码)+12(重复累加))</div>
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<td class="colOne"><code><span class="memberNameLink"><a href="../../../../../com/java2nb/novel/common/utils/IdWorker.html#IdWorker--">IdWorker</a></span>()</code> </td>
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<td class="colOne"><code><span class="memberNameLink"><a href="../../../../../com/java2nb/novel/common/utils/IdWorker.html#IdWorker-long-long-">IdWorker</a></span>(long workerId,
long datacenterId)</code> </td>
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<td class="colFirst"><code>protected static long</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../com/java2nb/novel/common/utils/IdWorker.html#getDatacenterId-long-">getDatacenterId</a></span>(long maxDatacenterId)</code>
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数据标识id部分
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<td class="colFirst"><code>protected static long</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../com/java2nb/novel/common/utils/IdWorker.html#getMaxWorkerId-long-long-">getMaxWorkerId</a></span>(long datacenterId,
long maxWorkerId)</code>
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获取 maxWorkerId
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<td class="colFirst"><code>long</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../com/java2nb/novel/common/utils/IdWorker.html#nextId--">nextId</a></span>()</code>
<div class="block">获取下一个ID</div>
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<pre>public IdWorker()</pre>
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<pre>public IdWorker(long workerId,
long datacenterId)</pre>
<dl>
<dt><span class="paramLabel">参数:</span></dt>
<dd><code>workerId</code> - 工作机器ID</dd>
<dd><code>datacenterId</code> - 序列号</dd>
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<pre>public long nextId()</pre>
<div class="block">获取下一个ID</div>
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<pre>protected static long getMaxWorkerId(long datacenterId,
long maxWorkerId)</pre>
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获取 maxWorkerId
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<pre>protected static long getDatacenterId(long maxDatacenterId)</pre>
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数据标识id部分
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