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<mxCell id="OFWOy6sgKmJJG_9dfcx7-22" value="<div style="font-size: 11px;">Thread t = Thread.currentThread();</div><div style="font-size: 11px;">ThreadLocalMap map = <b>getMap</b>(t);</div><div style="font-size: 11px;">if (map != null) {</div><div style="font-size: 11px;"><font color="#007fff">&nbsp; &nbsp; //this 是 ThreadLocal 对象</font></div><div style="font-size: 11px;">&nbsp; &nbsp; ThreadLocalMap.Entry e = map.<b>getEntry</b>(this);</div><div style="font-size: 11px;">&nbsp; &nbsp; if (e != null) {</div><div style="font-size: 11px;"><span style="background-color: initial;">&nbsp; &nbsp; &nbsp; &nbsp; T result = (T)e.value;</span><br></div><div style="font-size: 11px;">&nbsp; &nbsp; &nbsp; &nbsp; return result;</div><div style="font-size: 11px;">&nbsp; &nbsp; }</div><div style="font-size: 11px;">}</div><div style="font-size: 11px;"><font color="#007fff">// e == null, 就调用上面函数式方法设置初始值</font></div><div style="font-size: 11px;">return setInitialValue();</div>" style="rounded=1;whiteSpace=wrap;html=1;align=left;arcSize=4;fontSize=11;" vertex="1" parent="1">
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<mxCell id="OFWOy6sgKmJJG_9dfcx7-24" value="<p style="margin: 4px 0px 0px; text-align: center;"><b>Thread</b><br style="font-size: 11px;"></p><hr style="font-size: 11px;"><p style="margin: 0px 0px 0px 4px;"><span style="background-color: initial;">private volatile String name;</span><br></p><p style="margin: 0px 0px 0px 4px;">private int&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; priority;</p><p style="margin: 0px 0px 0px 4px;">private Thread&nbsp; &nbsp; &nbsp; &nbsp; &nbsp;threadQ;</p><p style="margin: 0px 0px 0px 4px;">private long&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;eetop;</p><p style="margin: 0px 0px 0px 4px;">private boolean&nbsp; &nbsp; &nbsp;single_step;</p><p style="margin: 0px 0px 0px 4px;"><font color="#007fff">//是否是守护线程</font></p><p style="margin: 0px 0px 0px 4px;">private boolean&nbsp; &nbsp; &nbsp;daemon = false;</p><p style="margin: 0px 0px 0px 4px;">private boolean&nbsp; &nbsp; &nbsp;stillborn = false;</p><p style="margin: 0px 0px 0px 4px;"><font color="#007fff">//线程任务</font></p><p style="margin: 0px 0px 0px 4px;">private Runnable target;</p><p style="margin: 0px 0px 0px 4px;">private ThreadGroup group;</p><p style="margin: 0px 0px 0px 4px;">private ClassLoader contextClassLoader;</p><p style="margin: 0px 0px 0px 4px;">private AccessControlContext inheritedAccessControlContext;</p><p style="margin: 0px 0px 0px 4px;">private static int threadInitNumber;</p><p style="margin: 0px 0px 0px 4px;"><font color="#007fff">//线程本地变量的Map</font></p><p style="margin: 0px 0px 0px 4px;">ThreadLocal.ThreadLocalMap <b>threadLocals</b> = null;</p><p style="margin: 0px 0px 0px 4px;"><font color="#007fff">//可继承的线程本地变量的Map</font></p><p style="margin: 0px 0px 0px 4px;">ThreadLocal.ThreadLocalMap <b>inheritableThreadLocals</b> = null;</p><p style="margin: 0px 0px 0px 4px;">private long stackSize;</p><p style="margin: 0px 0px 0px 4px;">private long nativeParkEventPointer;</p><p style="margin: 0px 0px 0px 4px;"><font color="#007fff">//Thread ID</font></p><p style="margin: 0px 0px 0px 4px;">private long tid;</p><p style="margin: 0px 0px 0px 4px;"><font color="#007fff">//用于生成Thread ID&nbsp;</font></p><p style="margin: 0px 0px 0px 4px;">private static long threadSeqNumber;</p><p style="margin: 0px 0px 0px 4px;">private volatile int threadStatus = 0;</p><hr style="font-size: 11px;"><p style="margin: 0px 0px 0px 4px; font-size: 11px;">ThreadLocalMap getMap(Thread t)</p><p style="margin: 0px 0px 0px 4px; font-size: 11px;"><br></p>" style="verticalAlign=top;align=left;overflow=fill;fontSize=11;fontFamily=Helvetica;html=1;whiteSpace=wrap;" vertex="1" parent="1">
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<mxCell id="OFWOy6sgKmJJG_9dfcx7-26" value="<div style="text-align: center;"><b>ThreadLocalMap</b></div><hr style="font-size: 11px;"><p style="margin: 0px 0px 0px 4px;"><span style="background-color: initial;"><font color="#007fff">//ThreadLocalMap初始容量</font></span></p><p style="margin: 0px 0px 0px 4px;"><span style="background-color: initial;">private static final int INITIAL_CAPACITY = 16;</span><br></p><p style="margin: 0px 0px 0px 4px;"><span style="background-color: initial;"><font color="#007fff">//哈希表</font></span></p><p style="margin: 0px 0px 0px 4px;">private Entry[] <b>table</b>;</p><p style="margin: 0px 0px 0px 4px;"><font color="#007fff">//实际元素个数</font></p><p style="margin: 0px 0px 0px 4px;">private int <b>size</b> = 0;</p><p style="margin: 0px 0px 0px 4px;">private int threshold;</p><hr style="font-size: 11px;"><p style="margin: 0px 0px 0px 4px; font-size: 11px;"><br></p>" style="verticalAlign=top;align=left;overflow=fill;fontSize=11;fontFamily=Helvetica;html=1;whiteSpace=wrap;fillColor=#dae8fc;strokeColor=#6c8ebf;" vertex="1" parent="1">
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<mxCell id="OFWOy6sgKmJJG_9dfcx7-28" value="<div style="text-align: center;"><b>Entry </b>extends&nbsp;<span style="background-color: initial;">WeakReference&lt;ThreadLocal&lt;?&gt;&gt;</span></div><hr style="font-size: 11px;"><p style="margin: 0px 0px 0px 4px;"><span style="background-color: initial;"><font color="#007fff"><b>//KEY是 ThreadLocal&lt;?&gt; 的弱引用类型</b></font></span></p><p style="margin: 0px 0px 0px 4px;"><span style="background-color: initial;"><font color="#007fff"><br></font></span></p><p style="margin: 0px 0px 0px 4px;"><span style="background-color: initial;"><font color="#007fff">//VALUE</font></span></p><p style="margin: 0px 0px 0px 4px;">Object value;<br></p><hr style="font-size: 11px;"><p style="margin: 0px 0px 0px 4px; font-size: 11px;"><br></p>" style="verticalAlign=top;align=left;overflow=fill;fontSize=11;fontFamily=Helvetica;html=1;whiteSpace=wrap;" vertex="1" parent="1">
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<mxCell id="OFWOy6sgKmJJG_9dfcx7-31" value="<div style="font-size: 11px;"><div>int i = key.<b>threadLocalHashCode</b> &amp; (table.length - 1);</div><div>Entry e = table[i];</div><div>if (e != null &amp;&amp; e.get() == key)</div><div>&nbsp; &nbsp; return e;</div><div>else</div><div><font color="#007fff">&nbsp; &nbsp; //e == null 或者 哈希冲突</font></div><div>&nbsp; &nbsp; return <b>getEntryAfterMiss</b>(key, i, e);</div></div>" style="rounded=1;whiteSpace=wrap;html=1;align=left;arcSize=4;fontSize=11;" vertex="1" parent="1">
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<mxCell id="OFWOy6sgKmJJG_9dfcx7-33" value="<div style="">getEntryAfterMiss(key, i, e);<br></div>" style="rounded=1;whiteSpace=wrap;html=1;align=center;arcSize=15;fontSize=11;" vertex="1" parent="1">
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<mxCell id="OFWOy6sgKmJJG_9dfcx7-35" value="<div style=""><div>Entry[] tab = table;</div><div>int len = tab.length;</div><div><br></div><div>while (e != null) {</div><div>&nbsp; &nbsp; ThreadLocal&lt;?&gt; k = e.get();</div><div>&nbsp; &nbsp; if (k == key)</div><div>&nbsp; &nbsp; &nbsp; &nbsp; return e;</div><div>&nbsp; &nbsp; if (k == null) <font color="#007fff">//Entry中key是弱引用，可能被GC导致为null，此时说明Entry对象已经过期，需要删除</font></div><div>&nbsp; &nbsp; &nbsp; &nbsp; <b>expungeStaleEntry</b>(i); <font color="#007fff">//这个方法就是删除过期Entry, 对于线性探测算法就是</font><font color="#007fff">后面的元素往前移，把刚空出的位置再填上</font></div><div>&nbsp; &nbsp; else <font color="#007fff">//哈希冲突</font></div><div><font color="#007fff">&nbsp; &nbsp; &nbsp; &nbsp; //深入内部实现可以看到用的是开放定址法的线性探测再哈希</font></div><div>&nbsp; &nbsp; &nbsp; &nbsp; i = <b>nextIndex</b>(i, len);</div><div>&nbsp; &nbsp; e = tab[i];</div><div>}</div><div>return null;</div></div>" style="rounded=1;whiteSpace=wrap;html=1;align=left;arcSize=3;fontSize=11;" vertex="1" parent="1">
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<mxCell id="OFWOy6sgKmJJG_9dfcx7-37" value="总结：<br><ol><li>ThreadLocal 本身用于计算哈希索引以及作为读写值的门面，本身不存储数据，数据存储在线程的 ThreadLocalMap 成员;&nbsp;</li><li>ThreadLocalMap 以 ThreadLocal&lt;?&gt;&gt; 弱引用类型作为 KEY，当ThreadLocal 对象强引用不存在后，下次GC KEY会变为 null, 意味着Entry过期，会在下次索引时清除（get set 等操作内部都会检查过期的KEY（包括其他ThreadLocal设置的过期的KEY），并进行清理）；</li><li>ThreadLocalMap 采用开放定址法的<b>线性探测再散列算法</b>解决哈希冲突。</li><li>ThreadLocal 内存泄露问题 （以不手动清理的前提下讨论ThreadLocal为何会内存泄露）<br>这里的内存泄露是指不调用 remove(), ThreadLocalMap Entry 会内存泄露（包括Key Value），每次使用完后都调用remove()清理是没有内存泄露问题的，（都已经清了还怎么泄露）详细在Markdown中解析。<br></li></ol>" style="text;html=1;strokeColor=none;fillColor=none;align=left;verticalAlign=top;whiteSpace=wrap;rounded=0;" vertex="1" parent="1">
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<mxCell id="OFWOy6sgKmJJG_9dfcx7-40" value="<div style=""><div style="">Thread t = Thread.currentThread();</div><div style="">ThreadLocalMap map = getMap(t);</div><div style="">if (map != null) {</div><div style="">&nbsp; &nbsp; map.set(this, value);</div><div style="">} else {</div><div style="">&nbsp; &nbsp; createMap(t, value);</div><div style="">}</div></div>" style="rounded=1;whiteSpace=wrap;html=1;align=left;arcSize=4;fontSize=11;" vertex="1" parent="1">
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<mxCell id="OFWOy6sgKmJJG_9dfcx7-43" value="<div style="">map.set(this, value);<br></div>" style="rounded=1;whiteSpace=wrap;html=1;align=center;arcSize=15;fontSize=11;" vertex="1" parent="1">
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<mxCell id="OFWOy6sgKmJJG_9dfcx7-44" value="<div style="">createMap(t, value);<br></div><div style=""><font color="#007fff">创建Map并设置值，比较简单不细讲了</font></div>" style="rounded=1;whiteSpace=wrap;html=1;align=center;arcSize=15;fontSize=11;" vertex="1" parent="1">
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<mxCell id="OFWOy6sgKmJJG_9dfcx7-46" value="<div style=""><div>Entry[] tab = table;</div><div>int len = tab.length;</div><div>int i = key.threadLocalHashCode &amp; (len-1);</div><div><font color="#007fff">//这个for循环处理值更新、哈希冲突</font></div><div>for (Entry e = tab[i];</div><div>&nbsp; &nbsp; &nbsp; &nbsp; e != null;</div><div>&nbsp; &nbsp; &nbsp; &nbsp; e = tab[i = nextIndex(i, len)]) {<font color="#007fff"> //冲突，线性探测再散列</font></div><div>&nbsp; &nbsp; ThreadLocal&lt;?&gt; k = e.get();</div><div><br></div><div>&nbsp; &nbsp; if (k == key) { /<font color="#007fff">/更新值</font></div><div>&nbsp; &nbsp; &nbsp; &nbsp; e.value = value;</div><div>&nbsp; &nbsp; &nbsp; &nbsp; return;</div><div>&nbsp; &nbsp; }</div><div>&nbsp; &nbsp; if (k == null) { <font color="#007fff">//key已经过期</font></div><div>&nbsp; &nbsp; &nbsp; &nbsp; <b>replaceStaleEntry</b>(key, value, i);</div><div>&nbsp; &nbsp; &nbsp; &nbsp; return;</div><div>&nbsp; &nbsp; }</div><div>}</div><div><font color="#007fff">//值不存在</font></div><div>tab[i] = new Entry(key, value);</div><div>int sz = ++size;</div><div>if (!<b>cleanSomeSlots</b>(i, sz) &amp;&amp; sz &gt;= threshold)</div><div>&nbsp; &nbsp; rehash();</div></div>" style="rounded=1;whiteSpace=wrap;html=1;align=left;arcSize=2;fontSize=11;" vertex="1" parent="1">
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<mxCell id="OFWOy6sgKmJJG_9dfcx7-48" value="TLHolder.remove()<br><font color="#007fff">用完之后必须手动清理下</font>" style="rounded=1;whiteSpace=wrap;html=1;" vertex="1" parent="1">
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<mxCell id="OFWOy6sgKmJJG_9dfcx7-50" value="tc.<b>remove</b>();" style="rounded=1;whiteSpace=wrap;html=1;fillColor=#dae8fc;strokeColor=#6c8ebf;" vertex="1" parent="1">
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<mxCell id="OFWOy6sgKmJJG_9dfcx7-54" value="<div style=""><div style=""><div>ThreadLocalMap m = getMap(Thread.currentThread());</div><div>if (m != null) {</div><div>&nbsp; &nbsp; m.<b>remove</b>(this);</div><div>}</div></div></div>" style="rounded=1;whiteSpace=wrap;html=1;align=left;arcSize=14;fontSize=11;" vertex="1" parent="1">
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<mxCell id="OFWOy6sgKmJJG_9dfcx7-55" value="<div style=""><div style=""><div>Entry[] tab = table;</div><div>int len = tab.length;</div><div>int i = key.threadLocalHashCode &amp; (len-1);</div><div>for (Entry e = tab[i];</div><div>&nbsp; &nbsp; &nbsp; &nbsp; e != null;&nbsp;</div><div>&nbsp; &nbsp; &nbsp; &nbsp; e = tab[i = nextIndex(i, len)]) {<font color="#007fff" style="font-size: 10px;">//线性探测寻址</font></div><div>&nbsp; &nbsp; if (e.get() == key) {<font color="#007fff"> //e.get()获取的是软引用内部的referent</font></div><div>&nbsp; &nbsp; &nbsp; &nbsp; e.<b>clear</b>(); <font color="#007fff">//将 referent 设置为 null</font></div><div>&nbsp; &nbsp; &nbsp; &nbsp; <b>expungeStaleEntry</b>(i);</div><div>&nbsp; &nbsp; &nbsp; &nbsp; return;</div><div>&nbsp; &nbsp; }</div><div>}</div></div></div>" style="rounded=1;whiteSpace=wrap;html=1;align=left;arcSize=4;fontSize=11;" vertex="1" parent="1">
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<mxCell id="OFWOy6sgKmJJG_9dfcx7-57" value="<font color="#007fff">不同线程操作同一个ThreadLocal对象，<br>实际操作的是是不同的ThreadLocalMap</font>" style="text;html=1;align=left;verticalAlign=middle;resizable=0;points=[];autosize=1;strokeColor=none;fillColor=none;" vertex="1" parent="1">
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