POP: load big messages in a separate thread

git-svn-id: http://svn.code.sf.net/p/davmail/code/trunk@2118 3d1905a2-6b24-0410-a738-b14d5a86fcbd

src/java/davmail/exchange/MessageLoadThread.java

@@ -0,0 +1,73 @@
+package davmail.exchange;
+
+import org.apache.log4j.Logger;
+
+import javax.mail.MessagingException;
+import java.io.IOException;
+import java.io.OutputStream;
+
+/**
+ * Message load thread.
+ * Used to avoid timeouts over POP and IMAP
+ */
+public class MessageLoadThread extends Thread {
+    private static final Logger LOGGER = Logger.getLogger(MessageLoadThread.class);
+
+    protected boolean isComplete = false;
+    protected ExchangeSession.Message message;
+    protected IOException ioException;
+    protected MessagingException messagingException;
+
+    protected MessageLoadThread(String threadName, ExchangeSession.Message message) {
+        super(threadName + "-LoadMessage");
+        setDaemon(true);
+        this.message = message;
+    }
+
+    public void run() {
+        try {
+            message.loadMimeMessage();
+        } catch (IOException e) {
+            ioException = e;
+        } catch (MessagingException e) {
+            messagingException = e;
+        } finally {
+            isComplete = true;
+        }
+    }
+
+    /**
+     * Load mime message in a separate thread if over 1MB.
+     * Send a space character every ten seconds to avoid client timeouts
+     *
+     * @param message      message
+     * @param outputStream output stream
+     * @throws IOException        on error
+     * @throws MessagingException on error
+     */
+    public static void loadMimeMessage(ExchangeSession.Message message, OutputStream outputStream) throws IOException, MessagingException {
+        if (message.size < 1024 * 1024) {
+            message.loadMimeMessage();
+        } else {
+            LOGGER.debug("Load large message " + (message.size / 1024) + "KB uid " + message.getUid() + " imapUid " + message.getImapUid() + " in a separate thread");
+            try {
+                MessageLoadThread messageLoadThread = new MessageLoadThread(currentThread().getName(), message);
+                messageLoadThread.start();
+                while (!messageLoadThread.isComplete) {
+                    messageLoadThread.join(10000);
+                    LOGGER.debug("Still loading uid " + message.getUid() + " imapUid " + message.getImapUid());
+                    outputStream.write(' ');
+                    outputStream.flush();
+                }
+                if (messageLoadThread.ioException != null) {
+                    throw messageLoadThread.ioException;
+                }
+                if (messageLoadThread.messagingException != null) {
+                    throw messageLoadThread.messagingException;
+                }
+            } catch (InterruptedException e) {
+                throw new IOException(e + " " + e.getMessage());
+            }
+        }
+    }
+}

src/java/davmail/imap/ImapConnection.java

@@ -30,6 +30,7 @@ import davmail.exception.HttpNotFoundException;
 import davmail.exception.InsufficientStorageException;
 import davmail.exchange.ExchangeSession;
 import davmail.exchange.ExchangeSessionFactory;
+import davmail.exchange.MessageLoadThread;
 import davmail.ui.tray.DavGatewayTray;
 import davmail.util.IOUtil;
 import davmail.util.StringUtil;
@@ -755,31 +756,6 @@ public class ImapConnection extends AbstractConnection {
         sendClient("* " + currentFolder.recent + " RECENT");
     }
 
-    class MessageLoadThread extends Thread {
-        boolean isComplete = false;
-        ExchangeSession.Message message;
-        IOException ioException;
-        MessagingException messagingException;
-
-        MessageLoadThread(String threadName, ExchangeSession.Message message) {
-            super(threadName + "-LoadMessage");
-            setDaemon(true);
-            this.message = message;
-        }
-
-        public void run() {
-            try {
-                message.loadMimeMessage();
-            } catch (IOException e) {
-                ioException = e;
-            } catch (MessagingException e) {
-                messagingException = e;
-            } finally {
-                isComplete = true;
-            }
-        }
-    }
-
     class MessageWrapper {
         protected OutputStream os;
         protected StringBuilder buffer;
@@ -808,30 +784,7 @@ public class ImapConnection extends AbstractConnection {
                 // flush current buffer
                 os.write(buffer.toString().getBytes());
                 buffer.setLength(0);
-                if (message.size < 1024 * 1024) {
-                    message.loadMimeMessage();
-                } else {
-                    LOGGER.debug("Load large message " +(message.size / 1024)+"KB uid "+ message.imapUid + " in a separate thread");
-                    try {
-                        MessageLoadThread messageLoadThread = new MessageLoadThread(currentThread().getName(), message);
-                        messageLoadThread.start();
-                        while (!messageLoadThread.isComplete) {
-                            messageLoadThread.join(10000);
-                            LOGGER.debug("Still loading " + message.imapUid);
-                            os.write(' ');
-                            os.flush();
-                        }
-                        if (messageLoadThread.ioException != null) {
-                            throw messageLoadThread.ioException;
-                        }
-                        if (messageLoadThread.messagingException != null) {
-                            throw messageLoadThread.messagingException;
-                        }
-                    } catch (InterruptedException e) {
-                        throw new IOException(e + " " + e.getMessage());
-                    }
-                }
-
+                MessageLoadThread.loadMimeMessage(message, os);
             }
         }
 

src/java/davmail/pop/PopConnection.java

@@ -25,6 +25,7 @@ import davmail.Settings;
 import davmail.exchange.DoubleDotOutputStream;
 import davmail.exchange.ExchangeSession;
 import davmail.exchange.ExchangeSessionFactory;
+import davmail.exchange.MessageLoadThread;
 import davmail.ui.tray.DavGatewayTray;
 import davmail.util.IOUtil;
 import org.apache.log4j.Logger;
@@ -204,6 +205,12 @@ public class PopConnection extends AbstractConnection {
                                     sendOK("");
                                     DoubleDotOutputStream doubleDotOutputStream = new DoubleDotOutputStream(os);
                                     ExchangeSession.Message message = messages.get(messageNumber);
+
+                                    // load big messages in a separate thread
+                                    os.write("+OK ".getBytes());
+                                    MessageLoadThread.loadMimeMessage(message, os);
+                                    sendClient("");
+
                                     IOUtil.write(message.getRawInputStream(), doubleDotOutputStream);
                                     doubleDotOutputStream.close();
                                     if (Settings.getBooleanProperty("davmail.popMarkReadOnRetr")) {