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POProducer-consumers(many). Consumers take and put into the shared queue
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I made a producer-consumer program. It's just a program in core java without any GUI(Swing or SWT). It has one producer who put objects into the queue. Also there is a few consumers who must add some staff(for example String) into Every object in that shared queue. So, every consumer must handle every object in a shared queue. In this case - every BookShelf must have items from All consumers in "books" ArrayList. consumers. Question: What condition should I use in consumers to finish their threads correctly? Here are the code fragments of the program. Maybe I implemented it in wrong way. Here is an object for the queue: <pre><code>public class BookShelf { private int id; private String name; private int height; private int weigh; List<String> books = Collections.synchronizedList(new ArrayList<String>()); public BookShelf(int id, String name) { this.id = id; this.name = name; } public void addBook(String book) { books.add(book); } public boolean eq(String book) { synchronized (books) { for (String b: books) { if (b.equalsIgnoreCase(book)) { return true; } } } return false; } other setters and getters.. </code></pre> } Here is the producer class: <pre><code>public class Producer implements Runnable { private BlockingQueue myQueue; public Producer(BlockingQueue myQueue) { this.myQueue = myQueue; } public void run() { for(int i=0; i<7; i++){ try { System.out.println("Produced: " + i); BookShelf myBookShelf = new BookShelf(i, "book #" + i); myQueue.put(myBookShelf); } catch (InterruptedException ex) { //Proper handle } } } </code></pre> } Here is one of consumers class: <pre><code> public class Consumer implements Runnable { private BlockingQueue myQueue; public Consumer(BlockingQueue myQueue) { this.myQueue = myQueue; } public void run() { while(true){ try { BookShelf tempBookShelf = (BookShelf) myQueue.take(); //eq() is my method to check if ArraList has a book. if (tempBookShelf.eq("Abc book")) { System.out.println("It already has book"); myQueue.put(tempBookShelf); Thread.sleep(2000); } else { tempBookShelf.addBook("Abc book"); myQueue.put(tempBookShelf); Thread.sleep(2000); } } catch (InterruptedException ex) { //Proper handle } } } } </code></pre> Here is main class: <pre><code>public class ProducerConsumerTest { public static void main(String[] args) { BlockingQueue sharedQueue = new LinkedBlockingQueue(); Thread prodThread = new Thread(new Producer(sharedQueue)); Thread consThread = new Thread(new Consumer(sharedQueue)); Thread consThread2 = new Thread(new Consumer2(sharedQueue)); prodThread.start(); consThread.start(); consThread2.start(); } } </code></pre>
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<java><multithreading><producer-consumer><blockingqueue>
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Producer-consumers(many). Consumers take and put into the shared queue
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