Java 监听线程状态

Question

出于调试目的，我想监听线程状态。我希望它在线程等待日志时以及“恢复”时打印通知。

Answer 1

鉴于您无法在 java.lang.Thread 上以 that variable is managed by native code 收听 private volatile int threadStatus;我能想到的唯一方法是拥有一个并行线程，其方法每 x 毫秒/秒运行一次并适当输出。

// keep old values in a map like this
HashMap<Thread, ThreadStatus> threadMap;

// loop all threads
Set<Thread> threadSet = Thread.getAllStackTraces().keySet();
ArrayList<Thread> threadArrayList = new ArrayList<>(threadSet);
for (Thread thread : threadArrayList) {
    // check if thread.getState() has changed, update accordingly
}

请注意，除了效率不高之外，您还会错过很多会在亚毫秒内发生的 ThreadStatus 更改。