如果队列中至少有一个使用方等待通过BlockingQueue.take()或定时轮询接收元素,则Java.util.concurrent.LinkedTransferQueue.hasWaitingConsumer()方法始终返回true。返回的值表示事务的瞬时状态。
句法
public boolean hasWaitingConsumer()
参数:它不接受任何参数。
返回值:如果队列中至少有一个使用者,则此方法返回一个布尔值,该值为true。
下面是一些示例来说明LinkedTransferQueue.hasWaitingConsumer()方法:
示例1:
// Java code to demonstrate
// hasWaitingConsumer() method
import java.util.concurrent.LinkedTransferQueue;
class GFG {
public static void main(String args[])
{
LinkedTransferQueue<String> LTQ
= new LinkedTransferQueue<String>();
LTQ.add("Geeks");
LTQ.add("For");
LTQ.add("Geeks");
LTQ.add("GeeksForGeeks");
System.out.println(LTQ.hasWaitingConsumer());
}
}
false
示例2:
// Java code to demonstrate
// hasWaitingConsumer() method
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.LinkedTransferQueue;
public class GFG {
LinkedTransferQueue<Integer> LTQ
= new LinkedTransferQueue<>();
class LTQProducer implements Runnable {
@Override
public void run()
{
for (int i = 0; i < 3; i++) {
try {
System.out.println("Producer is"
+ " waiting to transfer");
LTQ.transfer(i);
System.out.println("Producer transferred"
+ " element: "
+ i);
System.out.println("Is there any consumer"
+ " still waiting to"
+ " receive an element"
+ " after transfer -> "
+ LTQ.hasWaitingConsumer());
}
catch (InterruptedException e) {
e.printStackTrace();
}
}
}
}
class LTQConsumer implements Runnable {
int id;
LTQConsumer(int id)
{
this.id = id;
}
@Override
public void run()
{
try {
System.out.println("Consumer "
+ id
+ " is waiting to "
+ "take an element.");
System.out.println("Is there any consumer"
+ " still waiting to"
+ " receive an element"
+ " after transfer -> "
+ LTQ.hasWaitingConsumer());
Integer s = LTQ.take();
System.out.println("Consumer "
+ id
+ " received Element: "
+ s);
}
catch (InterruptedException e) {
System.out.println(e);
}
}
}
// Driver code
public static void main(String[] args)
throws InterruptedException
{
GFG ob = new GFG();
ExecutorService exService
= Executors.newFixedThreadPool(3);
LTQProducer p = ob.new LTQProducer();
LTQConsumer c1 = ob.new LTQConsumer(0);
LTQConsumer c2 = ob.new LTQConsumer(1);
exService.execute(p);
exService.execute(c1);
exService.execute(c2);
exService.shutdown();
}
}
Producer is waiting to transfer
Consumer 0 is waiting to take an element.
Is there any consumer waiting to take an element -> false
Consumer 1 is waiting to take an element.
Is there any consumer waiting to take an element -> false
Consumer 0 received Element: 0
Producer transferred element: 0
Is there any consumer still waiting to receive an element after transfer -> true
Producer is waiting to transfer
Producer transferred element: 1
Consumer 1 received Element: 1
Is there any consumer still waiting to receive an element after transfer -> false
Producer is waiting to transfer
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注:本文由纯净天空筛选整理自psil123大神的英文原创作品 LinkedTransferQueue hasWaitingConsumer() method in Java。非经特殊声明,原始代码版权归原作者所有,本译文未经允许或授权,请勿转载或复制。