ThreadLocal解析
ThreadLocal解析
功能
线程间保存自己的变量副本,保证线程安全
方法间传递变量
源码解析
set方法讲变量存储到跟线程相关的map中
public void set(T value) { Thread t = Thread.currentThread();
// 获取当前线程的map
ThreadLocalMap map = getMap(t);
if (map != null)
map.set(this, value);
else
createMap(t, value);
}
ThreadLocalMap getMap(Thread t) {
// 线程对象里面包含这个map
return t.threadLocals;
}
get方法
public T get() { Thread t = Thread.currentThread();
// 取出对应map
ThreadLocalMap map = getMap(t);
if (map != null) {
ThreadLocalMap.Entry e = map.getEntry(this);
if (e != null) {
@SuppressWarnings("unchecked")
T result = (T)e.value;
return result;
}
}
return setInitialValue();
}
参考
- https://blog.csdn.net/coslay/article/details/38293689
- https://www.liaoxuefeng.com/wiki/1252599548343744/1306581251653666
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