1
我正在尋找只執行一個線程的特定操作集。 但是,我無法讓Executors.newSingleThreadExecutor使用來自地圖的緩存線程。具有緩存線程的單線程執行程序
import org.junit.Test;
import java.util.HashMap;
import java.util.Map;
import java.util.concurrent.Callable;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.ThreadFactory;
public class ThreadTest {
private final Callable<Boolean> task = new Callable() {
@Override
public Boolean call() {
System.out.println("Ran");
return Boolean.TRUE;
}
};
//this prints the Callable output "Ran"
@Test
public void testVanilla() throws InterruptedException {
ExecutorService service = Executors.newSingleThreadExecutor();
service.submit(task);
Thread.sleep(10);
}
//this does not print the Callable output "Ran"
@Test
public void testCached() throws InterruptedException {
Map<String, Thread> map = new HashMap<>();
Thread thread = new Thread("WORKER");
thread.setDaemon(false);
map.put("uniq", thread);
ExecutorService service = Executors.newSingleThreadExecutor(new ThreadFactory() {
@Override
public Thread newThread(Runnable r) {
return map.get("WORKER");
}
});
service.submit(task);
Thread.sleep(10);
}
}
有什麼明顯的錯誤嗎?我想知道爲什麼執行程序沒有在#2的情況下工作
上面的錯字。 map.put(「WORKER」,thread); – qwerty
「我想知道爲什麼執行者在案件#2中不工作」您能詳細說明嗎? – bradimus
testCached()不會打印出「Ran」,表示沒有調用可調用函數 – qwerty