Java多线程之ThreadLocal - 编程入门网
作者 佚名技术
来源 NET编程
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发布时间 2012-06-24
| turns the value in the current thread''s copy of this thread-local * variable. Creates and initializes the copy if this is the first time * the thread has called this method. * * @return the current thread''s value of this thread-local */ public T get() { Thread t = Thread.currentThread(); ThreadLocalMap map = getMap(t); if (map != null) return (T)map.get(this); // Maps are constructed lazily. if the map for this thread // doesn''t exist, create it, with this ThreadLocal and its // initial value as its only entry. T value = initialValue(); createMap(t, value); return value; }
B. ThreadLocal的set()方法：
/** * Sets the current thread''s copy of this thread-local variable * to the specified value. Many applications will have no need for * this functionality, relying solely on the {@link #initialValue} * method to set the values of thread-locals. * * @param value the value to be stored in the current threads'' copy of * this thread-local. */ public void set(T value) { Thread t = Thread.currentThread(); ThreadLocalMap map = getMap(t); if (map != null) map.set(this, value); else createMap(t, value); }
可以看到ThreadLocal在内部维护了一个Map，将变量的值和线程绑定起来，get/set方法都是对该线程对应的value进行操作，所以不会影响到其它线程。 |
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