Java tutorial
/* * DavMail POP/IMAP/SMTP/CalDav/LDAP Exchange Gateway * Copyright (C) 2009 Mickael Guessant * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License * as published by the Free Software Foundation; either version 2 * of the License, or (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */ package davmail; import davmail.caldav.CaldavServer; import davmail.exception.DavMailException; import davmail.exchange.ExchangeSessionFactory; import davmail.http.DavGatewayHttpClientFacade; import davmail.http.DavGatewaySSLProtocolSocketFactory; import davmail.imap.ImapServer; import davmail.ldap.LdapServer; import davmail.pop.PopServer; import davmail.smtp.SmtpServer; import davmail.ui.tray.DavGatewayTray; import org.apache.commons.httpclient.HttpClient; import org.apache.commons.httpclient.HttpStatus; import org.apache.commons.httpclient.methods.GetMethod; import org.apache.log4j.Logger; import java.io.BufferedReader; import java.io.IOException; import java.io.InputStreamReader; import java.util.ArrayList; /** * DavGateway main class */ public final class DavGateway { private static final Logger LOGGER = Logger.getLogger(DavGateway.class); private static final String HTTP_DAVMAIL_SOURCEFORGE_NET_VERSION_TXT = "http://davmail.sourceforge.net/version.txt"; private static boolean stopped; private DavGateway() { } private static final ArrayList<AbstractServer> SERVER_LIST = new ArrayList<AbstractServer>(); /** * Start the gateway, listen on specified smtp and pop3 ports * * @param args command line parameter config file path */ public static void main(String[] args) { if (args.length >= 1) { Settings.setConfigFilePath(args[0]); } Settings.load(); DavGatewayTray.init(); start(); // server mode: all threads are daemon threads, do not let main stop if (Settings.getBooleanProperty("davmail.server")) { Runtime.getRuntime().addShutdownHook(new Thread("Shutdown") { @Override public void run() { DavGatewayTray.debug(new BundleMessage("LOG_GATEWAY_INTERRUPTED")); DavGateway.stop(); stopped = true; } }); try { while (!stopped) { Thread.sleep(1000); } } catch (InterruptedException e) { DavGatewayTray.debug(new BundleMessage("LOG_GATEWAY_INTERRUPTED")); stop(); DavGatewayTray.debug(new BundleMessage("LOG_GATEWAY_STOP")); } } } /** * Start DavMail listeners. */ public static void start() { // register custom SSL Socket factory DavGatewaySSLProtocolSocketFactory.register(); // prepare HTTP connection pool DavGatewayHttpClientFacade.start(); SERVER_LIST.clear(); int smtpPort = Settings.getIntProperty("davmail.smtpPort"); if (smtpPort != 0) { SERVER_LIST.add(new SmtpServer(smtpPort)); } int popPort = Settings.getIntProperty("davmail.popPort"); if (popPort != 0) { SERVER_LIST.add(new PopServer(popPort)); } int imapPort = Settings.getIntProperty("davmail.imapPort"); if (imapPort != 0) { SERVER_LIST.add(new ImapServer(imapPort)); } int caldavPort = Settings.getIntProperty("davmail.caldavPort"); if (caldavPort != 0) { SERVER_LIST.add(new CaldavServer(caldavPort)); } int ldapPort = Settings.getIntProperty("davmail.ldapPort"); if (ldapPort != 0) { SERVER_LIST.add(new LdapServer(ldapPort)); } BundleMessage.BundleMessageList messages = new BundleMessage.BundleMessageList(); BundleMessage.BundleMessageList errorMessages = new BundleMessage.BundleMessageList(); for (AbstractServer server : SERVER_LIST) { try { server.bind(); server.start(); messages.add(new BundleMessage("LOG_PROTOCOL_PORT", server.getProtocolName(), server.getPort())); } catch (DavMailException e) { errorMessages.add(e.getBundleMessage()); } catch (IOException e) { errorMessages.add( new BundleMessage("LOG_SOCKET_BIND_FAILED", server.getProtocolName(), server.getPort())); } } final String currentVersion = getCurrentVersion(); boolean showStartupBanner = Settings.getBooleanProperty("davmail.showStartupBanner", true); if (showStartupBanner) { DavGatewayTray.info(new BundleMessage("LOG_DAVMAIL_GATEWAY_LISTENING", currentVersion == null ? "" : currentVersion, messages)); } if (!errorMessages.isEmpty()) { DavGatewayTray.error(new BundleMessage("LOG_MESSAGE", errorMessages)); } // check for new version in a separate thread new Thread("CheckRelease") { @Override public void run() { String releasedVersion = getReleasedVersion(); if (currentVersion != null && currentVersion.length() > 0 && releasedVersion != null && currentVersion.compareTo(releasedVersion) < 0) { DavGatewayTray.info(new BundleMessage("LOG_NEW_VERSION_AVAILABLE", releasedVersion)); } } }.start(); } /** * Stop all listeners, shutdown connection pool and clear session cache. */ public static void stop() { DavGateway.stopServers(); // close pooled connections DavGatewayHttpClientFacade.stop(); // clear session cache ExchangeSessionFactory.reset(); DavGatewayTray.info(new BundleMessage("LOG_GATEWAY_STOP")); DavGatewayTray.dispose(); } /** * Stop all listeners and clear session cache. */ public static void restart() { DavGateway.stopServers(); // clear session cache ExchangeSessionFactory.reset(); DavGateway.start(); } private static void stopServers() { for (AbstractServer server : SERVER_LIST) { server.close(); try { server.join(); } catch (InterruptedException e) { DavGatewayTray.warn(new BundleMessage("LOG_EXCEPTION_WAITING_SERVER_THREAD_DIE"), e); } } } /** * Get current DavMail version. * * @return current version */ public static String getCurrentVersion() { Package davmailPackage = DavGateway.class.getPackage(); String currentVersion = davmailPackage.getImplementationVersion(); if (currentVersion == null) { currentVersion = ""; } return currentVersion; } /** * Get latest released version from SourceForge. * * @return latest version */ public static String getReleasedVersion() { String version = null; if (!Settings.getBooleanProperty("davmail.disableUpdateCheck")) { BufferedReader versionReader = null; GetMethod getMethod = new GetMethod(HTTP_DAVMAIL_SOURCEFORGE_NET_VERSION_TXT); try { HttpClient httpClient = DavGatewayHttpClientFacade .getInstance(HTTP_DAVMAIL_SOURCEFORGE_NET_VERSION_TXT); int status = httpClient.executeMethod(getMethod); if (status == HttpStatus.SC_OK) { versionReader = new BufferedReader(new InputStreamReader(getMethod.getResponseBodyAsStream())); version = versionReader.readLine(); LOGGER.debug("DavMail released version: " + version); } } catch (IOException e) { DavGatewayTray.debug(new BundleMessage("LOG_UNABLE_TO_GET_RELEASED_VERSION")); } finally { if (versionReader != null) { try { versionReader.close(); } catch (IOException e) { // ignore } } getMethod.releaseConnection(); } } return version; } }