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POHaving problemns using threads to copy emails to folder in javamail
 

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  1. POHaving problemns using threads to copy emails to folder in javamail
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    <p>I´m having problem to copy some emails to other folder using threads, my problem is, the code don´t wait to finish the job.</p> <p>I want to move the messages by threads to accelaret the job, but I need to wait to move all messages, so how can I do this?</p> <pre><code>private static void moveMessagesToFolders(List&lt;Message&gt; listMessages, Store store, Set&lt;String&gt; setSender) throws MessagingException { HashMap&lt;String, List&lt;Message&gt;&gt; mapMessages = separeteMessagesBySender(listMessages, setSender); for (Entry&lt;String, List&lt;Message&gt;&gt; mapMessage : mapMessages.entrySet()) { Message[] messageArray = mapMessage.getValue().toArray(new Message[mapMessage.getValue().size()]); moveMessagesThread(messageArray, mapMessage, store); } } private static void moveMessagesThread(Message[] messageArray, Entry&lt;String, List&lt;Message&gt;&gt; mapMessage, Store store) { Set&lt;Thread&gt; setThread = createMovimentSetThread(messageArray, mapMessage, store); for (Thread thread : setThread) { thread.start(); } } private static Set&lt;Thread&gt; createMovimentSetThread(Message[] messageArray, Entry&lt;String, List&lt;Message&gt;&gt; mapMessage, Store store) { int [] threadIndexs = MathUtil.generateIndex(messageArray); Set&lt;Thread&gt; setThread = new HashSet&lt;&gt;(threadIndexs.length); for (int i = 0; i &lt; threadIndexs.length; i++) { setThread.add(new ThreadMoveMessages(messageArray, mapMessage, store, threadIndexs[i])); } return setThread; } </code></pre> <p>After i change the method to this implementing Executor.</p> <pre><code>private static void moveMessagesThread(Message[] messageArray, Entry&lt;String, List&lt;Message&gt;&gt; mapMessage, Store store) { int [] threadIndexs = MathUtil.generateIndex(messageArray); ExecutorService executor = Executors.newFixedThreadPool(4); for (int i = 0; i &lt; 4; i++) { executor.execute(new ThreadMoveMessages(messageArray, mapMessage, store, threadIndexs[i])); } executor.shutdown(); } </code></pre> <p>Implementing the class Thread</p> <pre><code>public class ThreadMoveMessages implements Callable&lt;Boolean&gt; { private Entry&lt;String, List&lt;Message&gt;&gt; mapMessage; private Store store; private Message[] messageArray; private static int indexControler; private static int indexLimit; public ThreadMoveMessages(Message[] messageArray, Entry&lt;String, List&lt;Message&gt;&gt; mapMessage, Store store, int indexEnd) { this.messageArray = Arrays.copyOf(messageArray, indexEnd); this.indexControler += indexEnd; this.indexLimit = indexControler; this.mapMessage = mapMessage; } @Override public Boolean call() throws Exception { Folder folder = null; try { folder = this.store.getDefaultFolder().getFolder(this.mapMessage.getKey()); folder.open(Folder.READ_WRITE); folder.appendMessages(this.messageArray); EmailUtil.deleteListMessage(this.mapMessage.getValue()); } catch (MessagingException e) { e.printStackTrace(); } return true; } } </code></pre>
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    1. USDiego Macario
    1. USDiego Macario
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    1. COConsider using an [Executor](http://docs.oracle.com/javase/7/docs/api/java/util/concurrent/Executor.html) instead of managing the thread pool directly.
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      1. POHaving problemns using threads to copy emails to folder in javamail
      1. USSzymon Biliński
    2. CO@SzymonBiliński I´m reading about `Executor`, i felt confused because what I need to do? I found people implementing new class or using a single method
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      1. POHaving problemns using threads to copy emails to folder in javamail
      1. USDiego Macario
    3. COYou should probably start with the [basics](http://docs.oracle.com/javase/tutorial/essential/concurrency/executors.html), than read [this](http://stackoverflow.com/questions/3269445/executorservice-how-to-wait-for-all-tasks-to-finish) (waiting for all tasks to finish).
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      1. POHaving problemns using threads to copy emails to folder in javamail
      1. USSzymon Biliński
 

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