java多線程併發處理之阻塞隊列LinkedBlockingQueue用法

<pre name="code" class="java">public class ThreadRelatedService2 {

    // key point: records list must be ordered
    public void exec() {
        // System.out.println("Start ThreadRelatedService.exec:");
        List<String> list = new ArrayList<String>();
        // if there are 91000 records in the table
        for (int i = 0; i < 90000; i++) {
            list.add(String.valueOf(i));
        }
        for (int i = 0; i < 9; i++) {
            // get part records from table by page
            List<String> sublist = list.subList(10000 * i, 10000 * (i + 1));
            subExec(sublist);

        }
        // System.out.println("End ThreadRelatedService.exec:");

    }

    private void subExec(List<String> list) {
        // System.out.println("Start ThreadRelatedService.subExec:");
        Thread[] threadPool = new Thread[5];
        // ###############################
        LinkedBlockingQueue<List<String>> queue = new LinkedBlockingQueue<List<String>>();
        // ###############################
        for (int i = 0; i <= 9; i++) {
            // divide one page data to parts for different thread to process
            List<String> sublist = list.subList(1000 * i, 1000 * (i + 1));
            try {
                // put method not add method
                queue.put(sublist);
            } catch (InterruptedException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
        }

        // due to LinkedBlockingQueue,we can set fixed thread number
        for (int i = 0; i < 5; i++) {
            threadPool[i] = new Thread(new ThreadImpl(queue), "Thread" + i);
            threadPool[i].start();
        }

        for (Thread thread : threadPool) {
            try {
                thread.join();
            } catch (InterruptedException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
        }
        // System.out.println("End ThreadRelatedService.subExec:");
    }

    private class ThreadImpl implements Runnable {
        private LinkedBlockingQueue<List<String>> queue;

        public ThreadImpl(LinkedBlockingQueue<List<String>> queue) {
            this.queue = queue;
        }

        @Override
        public void run() {
            // System.out.println("Thread" + Thread.currentThread().getId());
            // System.out.println("Start ThreadRelatedService.run:");
            String result = "";
            List<String> list = queue.poll();
            while (list != null) {
                for (String str : list) {
                    result += str + "_";
                }
                System.out.println(result);
                list = queue.poll();
            }
            // System.out.println("End ThreadRelatedService.run:");
        }
    }
}