আমি একটি এক্সিকিউটর সার্ভিস বাস্তবায়ন খুঁজছি যা একটি সময়সীমা সহ সরবরাহ করা যায়। এক্সিকিউটর সার্ভিসে জমা দেওয়া টাস্কগুলি সঞ্চালনের সময়সীমা চেয়ে বেশি সময় নিলে বাধা দেওয়া হয়। এ জাতীয় জন্তুটি কার্যকর করা এত কঠিন কাজ নয়, তবে আমি ভাবছি যে বিদ্যমান বাস্তবায়ন সম্পর্কে কেউ জানেন কিনা।
নীচে কিছু আলোচনার ভিত্তিতে আমি কী নিয়ে এলাম তা এখানে। কোন মন্তব্য?
import java.util.List;
import java.util.concurrent.*;
public class TimeoutThreadPoolExecutor extends ThreadPoolExecutor {
private final long timeout;
private final TimeUnit timeoutUnit;
private final ScheduledExecutorService timeoutExecutor = Executors.newSingleThreadScheduledExecutor();
private final ConcurrentMap<Runnable, ScheduledFuture> runningTasks = new ConcurrentHashMap<Runnable, ScheduledFuture>();
public TimeoutThreadPoolExecutor(int corePoolSize, int maximumPoolSize, long keepAliveTime, TimeUnit unit, BlockingQueue<Runnable> workQueue, long timeout, TimeUnit timeoutUnit) {
super(corePoolSize, maximumPoolSize, keepAliveTime, unit, workQueue);
this.timeout = timeout;
this.timeoutUnit = timeoutUnit;
}
public TimeoutThreadPoolExecutor(int corePoolSize, int maximumPoolSize, long keepAliveTime, TimeUnit unit, BlockingQueue<Runnable> workQueue, ThreadFactory threadFactory, long timeout, TimeUnit timeoutUnit) {
super(corePoolSize, maximumPoolSize, keepAliveTime, unit, workQueue, threadFactory);
this.timeout = timeout;
this.timeoutUnit = timeoutUnit;
}
public TimeoutThreadPoolExecutor(int corePoolSize, int maximumPoolSize, long keepAliveTime, TimeUnit unit, BlockingQueue<Runnable> workQueue, RejectedExecutionHandler handler, long timeout, TimeUnit timeoutUnit) {
super(corePoolSize, maximumPoolSize, keepAliveTime, unit, workQueue, handler);
this.timeout = timeout;
this.timeoutUnit = timeoutUnit;
}
public TimeoutThreadPoolExecutor(int corePoolSize, int maximumPoolSize, long keepAliveTime, TimeUnit unit, BlockingQueue<Runnable> workQueue, ThreadFactory threadFactory, RejectedExecutionHandler handler, long timeout, TimeUnit timeoutUnit) {
super(corePoolSize, maximumPoolSize, keepAliveTime, unit, workQueue, threadFactory, handler);
this.timeout = timeout;
this.timeoutUnit = timeoutUnit;
}
@Override
public void shutdown() {
timeoutExecutor.shutdown();
super.shutdown();
}
@Override
public List<Runnable> shutdownNow() {
timeoutExecutor.shutdownNow();
return super.shutdownNow();
}
@Override
protected void beforeExecute(Thread t, Runnable r) {
if(timeout > 0) {
final ScheduledFuture<?> scheduled = timeoutExecutor.schedule(new TimeoutTask(t), timeout, timeoutUnit);
runningTasks.put(r, scheduled);
}
}
@Override
protected void afterExecute(Runnable r, Throwable t) {
ScheduledFuture timeoutTask = runningTasks.remove(r);
if(timeoutTask != null) {
timeoutTask.cancel(false);
}
}
class TimeoutTask implements Runnable {
private final Thread thread;
public TimeoutTask(Thread thread) {
this.thread = thread;
}
@Override
public void run() {
thread.interrupt();
}
}
}