我有一个正在运行的线程队列,想在执行时公开其一些数据,以监视进程。ThreadPoolExecutor
提供对其队列的访问权限,我可以遍历这些对象以调用我的重写的toString()
方法,但这些只是等待执行的线程。
有没有办法访问当前正在运行的线程来调用我的方法?也许一般来说,有更好的方法可以完成此任务?
为了更清楚地说明此目的,以下是一些基本概念代码:
public class GetDataTask implements Runnable {
private String pageNumber;
private int dataBlocksParsed;
private String source;
private String dataType;
public GetDataTask(String source, String dataType) {
this.source = source;
this.dataType = dataType;
}
@Override
public void run() {
//do stuff that affects pageNumber and dataBlocksParsed
}
@Override
public String toString() {
return "GetDataTask{" +
"source=" + source +
", dataType=" + dataType +
", pageNumber=" + pageNumber +
", dataBlocksParsed=" + dataBlocksParsed +
'}';
}
}
和一个持有执行人的类(class):
public class DataParseManager {
private static ThreadPoolExecutor executor = new ThreadPoolExecutor(100, 100, 20, TimeUnit.SECONDS, new ArrayBlockingQueue<>(300));
public void addParseDataTask(String source, String dataType) {
executor.execute(new GetDataTask(source, dataType));
}
// here's the method that I need
public String getInfo() {
StringBuilder info = new StringBuilder();
//and here's the method that I'm missing - executor.getActiveThreads()
for (Runnable r : executor.getActiveThreads()) {
info.append(((GetDataTask) r).toString()).append('\n');
}
return info.append(executor.toString()).toString();
}
}
最佳答案
这样包装Runnable怎么样。
static class MonitorRunnable implements Runnable {
static final List<Runnable> activeTasks = Collections.synchronizedList(new ArrayList<>());
private final Runnable runnable;
public MonitorRunnable(Runnable runnable) {
this.runnable = runnable;
}
@Override
public void run() {
activeTasks.add(runnable);
runnable.run();
activeTasks.remove(runnable);
}
}
和
public class DataParseManager {
private static ThreadPoolExecutor executor = new ThreadPoolExecutor(100, 100, 20, TimeUnit.SECONDS, new ArrayBlockingQueue<>(300));
public void addParseDataTask(String source, String dataType) {
executor.execute(new MonitorRunnable(new GetDataTask(source, dataType)));
}
// here's the method that I need
public String getInfo() {
StringBuilder info = new StringBuilder();
//and here's the method that I'm missing - executor.getActiveThreads()
synchronized (MonitorRunnable.activeTasks) {
for (Runnable r : MonitorRunnable.activeTasks) {
info.append(((GetDataTask) r).toString()).append('\n');
}
}
return info.append(executor.toString()).toString();
}
}
关于java - 如何访问ThreadPoolExecutor中正在运行的线程?,我们在Stack Overflow上找到一个类似的问题:https://stackoverflow.com/questions/35571395/