代码拉取完成，页面将自动刷新
CountDownLatch latch = new CountDownLatch(2);
Thread inputThread = new StreamThread(process.getInputStream(), threadName, latch);
Thread outputThread = new StreamThread(process.getErrorStream(), threadName, latch);
inputThread.setUncaughtExceptionHandler(new HeraCaughtExceptionHandler());
outputThread.setUncaughtExceptionHandler(new HeraCaughtExceptionHandler());
inputThread.start();
outputThread.start();
try {
exitCode = process.waitFor();
latch.await();
} catch (InterruptedException e) {
exitCode = Constants.INTERRUPTED_EXIT_CODE;
log(e);
} finally {
process = null;
}
再看取消任务的代码
//强制kill 进程
if (process != null) {
log("WARN Attempting to kill the process ");
try {
process.destroy();
int pid = getProcessId();
String st = "sudo sh -c \"cd; pstree " + pid + " -p | grep -o '([0-9]*)' | awk -F'[()]' '{print \\$2}' | xargs kill -9\"";
String[] commands = {"sudo", "sh", "-c", st};
ProcessBuilder processBuilder = new ProcessBuilder(commands);
try {
process = processBuilder.start();
log("kill process tree success");
} catch (Exception e) {
log(e);
}
} catch (Exception e) {
log(e);
} finally {
process = null;
}
}
String st = "sudo sh -c \"cd; pstree " + pid + " -p | grep -o '([0-9]*)' | awk -F'[()]' '{print \\$2}' | xargs kill -9\"";String st = "sudo sh -c \"cd; pstree " + pid + " -p | grep -o '([0-9]*)' | sed s/'[()]'/''/g | xargs kill -9\"";
所以可以看出，由于无法杀死子进程，所以实际cancel方法只是把窗口进程，也就是run()中启动的process的进程杀死了，而真正的执行任务的线程并没有杀死，而latch.await()方法则会导致任务的执行线程一直等待，直到子任务执行完毕。这个问题出现在所有shell启动的脚本里。看似杀死了任务，实际任务在后台跑得很快乐