作为方法的结果,想形成http调用的结果。例如:
错误代码:
getPersonId(idBook: number): number {
return this.mpShipmentWebAPI
.GetLast({ bookID: idBook })
.subscribe((books) => {
return Number(books.Data[0].ID);
});
}
我知道如何修复上述代码:
getPersonId(idBook: number): number {
return this.mpShipmentWebAPI
.GetLast({ bookID: idBook })
.subscribe((books) => {
this.handleData(books),
});
}
我想要的是以下列方式检查结果:
let idPerson = this.getPersonId(idBook);
if (idPerson > 0) {
//the rest code here
}
有可能吗?
答案 0 :(得分:1)
这是不可能的,因为http调用是异步的。不建议尝试使它们同步,因为这会冻结其他所有内容。正确的方法是:
import java.util.concurrent.ArrayBlockingQueue;
import java.util.concurrent.Executors;
import java.util.concurrent.RejectedExecutionHandler;
import java.util.concurrent.ThreadFactory;
import java.util.concurrent.ThreadPoolExecutor;
import java.util.concurrent.TimeUnit;
public class TestThreadPoolExecutor {
public static void main(String[] args) {
ThreadFactory threadFactory = Executors.defaultThreadFactory();
ArrayBlockingQueue<Runnable> arrayBlockingQueue = new ArrayBlockingQueue<Runnable>(10);
ThreadPoolExecutor threadPoolExecutor = new ThreadPoolExecutor(5, 10,1000, TimeUnit.SECONDS, arrayBlockingQueue, threadFactory, new RejectedExecutionHandlerImpl());
MonitorThread monitor = new MonitorThread(threadPoolExecutor, 3);
Thread monitorThread = new Thread(monitor);
monitorThread.start();
for (int i = 0; i < 100; i++) {
threadPoolExecutor.execute(new DummyRunnableTask(i));
}
//threadPoolExecutor.shutdown();
//monitor.shutDown();
}
}
class DummyRunnableTask implements Runnable {
private int i;
public DummyRunnableTask(int i) {
super();
this.i = i;
}
@Override
public void run() {
/*try {
Thread.sleep(1);
} catch (InterruptedException e) {
e.printStackTrace();
}*/
System.out.println("Thread Name:=" + Thread.currentThread().getName()+ " is working for id=" + i);
}
}
class RejectedExecutionHandlerImpl implements RejectedExecutionHandler {
@Override
public void rejectedExecution(Runnable r, ThreadPoolExecutor executor) {
System.out.println();
}
}
class MonitorThread implements Runnable{
private ThreadPoolExecutor executor;
private int seconds;
private Boolean run = true;
public MonitorThread(ThreadPoolExecutor executor, int seconds) {
super();
this.executor = executor;
this.seconds = seconds;
}
public void shutDown() {
this.run = false;
}
@Override
public void run() {
while (run) {
System.out.println(
String.format("[monitor] [%d/%d] Active: %d, Completed: %d, Task: %d, isShutdown: %s, isTerminated: %s",
this.executor.getPoolSize(),
this.executor.getCorePoolSize(),
this.executor.getActiveCount(),
this.executor.getCompletedTaskCount(),
this.executor.getTaskCount(),
this.executor.isShutdown(),
this.executor.isTerminated()));
try {
Thread.sleep(seconds*1000);
} catch (InterruptedException e) {
e.printStackTrace();
}
}
}
}
...
...............
Thread Name:=pool-1-thread-7 is working for id=97
Thread Name:=pool-1-thread-2 is working for id=95
Thread Name:=pool-1-thread-10 is working for id=94
Thread Name:=pool-1-thread-4 is working for id=93
[monitor] [0/5] Active: 0, Completed: 0, Task: 1, isShutdown: false, isTerminated: false
[monitor] [10/5] Active: 0, Completed: 88, Task: 88, isShutdown: false, isTerminated: false
[monitor] [10/5] Active: 0, Completed: 88, Task: 88, isShutdown: false, isTerminated: false