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POHow to make the main thread wait for the other threads to complete in ThreadPoolExecutor
 

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  1. POHow to make the main thread wait for the other threads to complete in ThreadPoolExecutor
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    <p>I am using the ThreadPoolExecutor to implement threading in my Java Application. </p> <p>I have a XML which I need to parse and add each node of it to a thread to execute the completion. My implementation is like this:</p> <p>parse_tp is a threadpool object created &amp; ParseQuotesXML is the class with the run method.</p> <pre><code> try { List children = root.getChildren(); Iterator iter = children.iterator(); //Parsing the XML while(iter.hasNext()) { Element child = (Element) iter.next(); ParseQuotesXML quote = new ParseQuotesXML(child, this); parse_tp.execute(quote); } System.out.println("Print it after all the threads have completed"); catch(Exception ex) { ex.printStackTrace(); } finally { System.out.println("Print it in the end."); if(!parse_tp.isShutdown()) { if(parse_tp.getActiveCount() == 0 &amp;&amp; parse_tp.getQueue().size() == 0 ) { parse_tp.shutdown(); } else { try { parse_tp.awaitTermination(30, TimeUnit.SECONDS); } catch (InterruptedException ex) { log.info("Exception while terminating the threadpool "+ex.getMessage()); ex.printStackTrace(); } } } parse_tp.shutdown(); } </code></pre> <p>The problem is, the two print out statements are printed before the other threads exit. I want to make the main thread wait for all other threads to complete. In normal Thread implementation I can do it using join() function but not getting a way to achieve the same in ThreadPool Executor. Also would like to ask if the code written in finally block to close the threadpool proper ?</p> <p>Thanks, Amit</p>
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