首页 \ 问答 \ 阻塞队列取代同步(Blocking queue to replace synchronized)

阻塞队列取代同步(Blocking queue to replace synchronized)

我用下面的阻塞队列替换了下面的代码。
为什么我会得到一个队列完整的异常 - 是不是阻塞队列可以预防这种情况?

    class Offer implements Runnable{
        Random r=new Random();
        public void run(){
            while(System.currentTimeMillis() < end){
                synchronized(b){
                    try{
                        while(b.size()>10){
                            b.wait();
                        }
                        b.add(r.nextInt());
                        b.notify();

                    }catch(InterruptedException x){}
                }
            }
        }       
    }

    class Take implements Runnable{
        public void run(){
            while(System.currentTimeMillis() < end){
                synchronized(b){
                    try{
                        while(b.size()<1){
                            b.wait();
                        }   
                        b.remove(0);
                        b.notify();


                    }catch(InterruptedException x){}
                }
            }
        }       
    }

阻塞队列相当于 -

BlockingQueue<Integer> b = new ArrayBlockingQueue<Integer>(10);
    class Offer implements Runnable{
        Random r=new Random();
        public void run(){
            while(System.currentTimeMillis() < end){
                b.add(r.nextInt());
            }
        }       
    }

    class Take implements Runnable{
        public void run(){
            while(System.currentTimeMillis() < end){
                b.remove(0);
            }
        }       
    }

I replaced the following code with the blocking Queue below.
Why do I get a queue full exception - isn't the blocking queue expected to prevent just that?

    class Offer implements Runnable{
        Random r=new Random();
        public void run(){
            while(System.currentTimeMillis() < end){
                synchronized(b){
                    try{
                        while(b.size()>10){
                            b.wait();
                        }
                        b.add(r.nextInt());
                        b.notify();

                    }catch(InterruptedException x){}
                }
            }
        }       
    }

    class Take implements Runnable{
        public void run(){
            while(System.currentTimeMillis() < end){
                synchronized(b){
                    try{
                        while(b.size()<1){
                            b.wait();
                        }   
                        b.remove(0);
                        b.notify();


                    }catch(InterruptedException x){}
                }
            }
        }       
    }

THe blockingqueue equivalent -

BlockingQueue<Integer> b = new ArrayBlockingQueue<Integer>(10);
    class Offer implements Runnable{
        Random r=new Random();
        public void run(){
            while(System.currentTimeMillis() < end){
                b.add(r.nextInt());
            }
        }       
    }

    class Take implements Runnable{
        public void run(){
            while(System.currentTimeMillis() < end){
                b.remove(0);
            }
        }       
    }

原文:https://stackoverflow.com/questions/43956250
更新时间:2023-05-30 12:05

最满意答案

你可以使用List.collect方法和模式匹配:

list.collect{ case Example(x, "3", null) => x }
// res1: List[String] = List(Five)

You could use List.collect method with pattern matching:

list.collect{ case Example(x, "3", null) => x }
// res1: List[String] = List(Five)

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