// yacy.java
// -----------------------
// (C) by Michael Peter Christen; mc@yacy.net
// first published on http://www.yacy.net
// Frankfurt, Germany, 2004, 2005
//
// $LastChangedDate$
// $LastChangedRevision$
// $LastChangedBy$
//
// 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
package net.yacy;
import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.FileWriter;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.io.RandomAccessFile;
import java.nio.channels.FileChannel;
import java.nio.channels.FileLock;
import java.util.Properties;
import java.util.concurrent.Semaphore;
import net.yacy.cora.date.GenericFormatter;
import net.yacy.cora.lod.JenaTripleStore;
import net.yacy.cora.protocol.ClientIdentification;
import net.yacy.cora.protocol.RequestHeader;
import net.yacy.cora.protocol.http.HTTPClient;
import net.yacy.cora.sorting.Array;
import net.yacy.gui.YaCyApp;
import net.yacy.gui.framework.Browser;
import net.yacy.kelondro.logging.Log;
import net.yacy.kelondro.util.FileUtils;
import net.yacy.kelondro.util.Formatter;
import net.yacy.kelondro.util.MemoryControl;
import net.yacy.kelondro.util.OS;
import net.yacy.peers.operation.yacyBuildProperties;
import net.yacy.peers.operation.yacyRelease;
import net.yacy.peers.operation.yacyVersion;
import net.yacy.search.Switchboard;
import net.yacy.search.SwitchboardConstants;
import com.google.common.io.Files;
import de.anomic.data.Translator;
import de.anomic.http.server.HTTPDemon;
import de.anomic.server.serverCore;
/**
* This is the main class of YaCy. Several threads are started from here:
* <ul>
* <li>one single instance of the plasmaSwitchboard is generated, which itself
* starts a thread with a plasmaHTMLCache object. This object simply counts
* files sizes in the cache and terminates them. It also generates a
* plasmaCrawlerLoader object, which may itself start some more httpc-calling
* threads to load web pages. They terminate automatically when a page has
* loaded.
* <li>one serverCore - thread is started, which implements a multi-threaded
* server. The process may start itself many more processes that handle
* connections.lo
* <li>finally, all idle-dependent processes are written in a queue in
* plasmaSwitchboard which are worked off inside an idle-sensitive loop of the
* main process. (here)
* </ul>
*
* On termination, the following must be done:
* <ul>
* <li>stop feeding of the crawling process because it otherwise fills the
* indexing queue.
* <li>say goodbye to connected peers and disable new connections. Don't wait for
* success.
* <li>first terminate the serverCore thread. This prevents that new cache
* objects are queued.
* <li>wait that the plasmaHTMLCache terminates (it should be normal that this
* process already has terminated).
* <li>then wait for termination of all loader process of the
* plasmaCrawlerLoader.
* <li>work off the indexing and cache storage queue. These values are inside a
* RAM cache and would be lost otherwise.
* <li>write all settings.
* <li>terminate.
* </ul>
*/
public final class yacy {
// static objects
public static final String vString = yacyBuildProperties.getVersion();
public static float version = 0.1f;
public static final String vDATE = yacyBuildProperties.getBuildDate();
public static final String copyright = "[ YaCy v" + vString + ", build " + vDATE + " by Michael Christen / www.yacy.net ]";
public static final String hline = "-------------------------------------------------------------------------------";
public static final Semaphore shutdownSemaphore = new Semaphore(0);
/**
* a reference to the {@link Switchboard} created by the
* {@link yacy#startup(String, long, long)} method.
*/
private static Switchboard sb = null;
public static String homedir;
public static File dataHome_g;
/**
* Starts up the whole application. Sets up all datastructures and starts
* the main threads.
*
* @param homePath Root-path where all information is to be found.
* @param startupFree free memory at startup time, to be used later for statistics
*/
private static void startup(final File dataHome, final File appHome, final long startupMemFree, final long startupMemTotal, final boolean gui) {
try {
// start up
System.out.println(copyright);
System.out.println(hline);
// check java version
try {
"a".codePointAt(0); // needs at least Java 1.5
} catch (final NoSuchMethodError e) {
System.err.println("STARTUP: Java Version too low. You need at least Java 1.5 to run YaCy"); // TODO: is 1.6 now
Thread.sleep(3000);
System.exit(-1);
}
// ensure that there is a DATA directory, if not, create one and if that fails warn and die
mkdirsIfNeseccary(dataHome);
dataHome_g = dataHome;
mkdirsIfNeseccary(appHome);
File f = new File(dataHome, "DATA/");
mkdirsIfNeseccary(f);
if (!(f.exists())) {
System.err.println("Error creating DATA-directory in " + dataHome.toString() + " . Please check your write-permission for this folder. YaCy will now terminate.");
System.exit(-1);
}
homedir = appHome.toString();
// setting up logging
f = new File(dataHome, "DATA/LOG/");
mkdirsIfNeseccary(f);
f = new File(dataHome, "DATA/LOG/yacy.logging");
final File f0 = new File(appHome, "defaults/yacy.logging");
if (!f.exists() || f0.lastModified() > f.lastModified()) try {
Files.copy(f0, f);
} catch (final IOException e){
System.out.println("could not copy yacy.logging");
}
try{
Log.configureLogging(dataHome, appHome, new File(dataHome, "DATA/LOG/yacy.logging"));
} catch (final IOException e) {
System.out.println("could not find logging properties in homePath=" + dataHome);
Log.logException(e);
}
Log.logConfig("STARTUP", "YaCy version: " + yacyBuildProperties.getVersion() + "/" + yacyBuildProperties.getSVNRevision());
Log.logConfig("STARTUP", "Java version: " + System.getProperty("java.version", "no-java-version"));
Log.logConfig("STARTUP", "Operation system: " + System.getProperty("os.name","unknown"));
Log.logConfig("STARTUP", "Application root-path: " + appHome);
Log.logConfig("STARTUP", "Data root-path: " + dataHome);
Log.logConfig("STARTUP", "Time zone: UTC" + GenericFormatter.UTCDiffString() + "; UTC+0000 is " + System.currentTimeMillis());
Log.logConfig("STARTUP", "Maximum file system path length: " + OS.maxPathLength);
f = new File(dataHome, "DATA/yacy.running");
if (f.exists()) { // another instance running? VM crash? User will have to care about this
Log.logSevere("STARTUP", "WARNING: the file " + f + " exists, this usually means that a YaCy instance is still running");
delete(f);
}
if(!f.createNewFile())
Log.logSevere("STARTUP", "WARNING: the file " + f + " can not be created!");
try { new FileOutputStream(f).write(Integer.toString(OS.getPID()).getBytes()); } catch (final Exception e) { } // write PID
f.deleteOnExit();
FileChannel channel = null;
FileLock lock = null;
try {
channel = new RandomAccessFile(f,"rw").getChannel();
lock = channel.tryLock(); // lock yacy.running
} catch (final Exception e) { }
final String oldconf = "DATA/SETTINGS/httpProxy.conf".replace("/", File.separator);
final String newconf = "DATA/SETTINGS/yacy.conf".replace("/", File.separator);
final File oldconffile = new File(dataHome, oldconf);
if (oldconffile.exists()) {
final File newconfFile = new File(dataHome, newconf);
if(!oldconffile.renameTo(newconfFile))
Log.logSevere("STARTUP", "WARNING: the file " + oldconffile + " can not be renamed to "+ newconfFile +"!");
}
try {
sb = new Switchboard(dataHome, appHome, "defaults/yacy.init".replace("/", File.separator), newconf);
} catch (final RuntimeException e) {
Log.logSevere("STARTUP", "YaCy cannot start: " + e.getMessage(), e);
System.exit(-1);
}
//sbSync.V(); // signal that the sb reference was set
// switch the memory strategy
MemoryControl.setStandardStrategy(sb.getConfigBool("memory.standardStrategy", true));
// save information about available memory at startup time
sb.setConfig("memoryFreeAfterStartup", startupMemFree);
sb.setConfig("memoryTotalAfterStartup", startupMemTotal);
// start gui if wanted
if (gui) YaCyApp.start("localhost", (int) sb.getConfigLong("port", 8090));
// hardcoded, forced, temporary value-migration
sb.setConfig("htTemplatePath", "htroot/env/templates");
int oldRev;
try {
oldRev = Integer.parseInt(sb.getConfig("svnRevision", "0"));
} catch (final NumberFormatException e) {
oldRev = 0;
}
final int newRev = Integer.parseInt(yacyBuildProperties.getSVNRevision());
sb.setConfig("svnRevision", yacyBuildProperties.getSVNRevision());
sb.setConfig("applicationRoot", appHome.toString());
sb.setConfig("dataRoot", dataHome.toString());
yacyVersion.latestRelease = version;
// read environment
final int timeout = Math.max(5000, Integer.parseInt(sb.getConfig("httpdTimeout", "5000")));
// create some directories
final File htRootPath = new File(appHome, sb.getConfig("htRootPath", "htroot"));
final File htDocsPath = sb.getDataPath(SwitchboardConstants.HTDOCS_PATH, SwitchboardConstants.HTDOCS_PATH_DEFAULT);
mkdirIfNeseccary(htDocsPath);
//final File htTemplatePath = new File(homePath, sb.getConfig("htTemplatePath","htdocs"));
// create default notifier picture
//TODO: Use templates instead of copying images ...
if (!((new File(htDocsPath, "notifier.gif")).exists())) try {
Files.copy(new File(htRootPath, "env/grafics/empty.gif"),
new File(htDocsPath, "notifier.gif"));
} catch (final IOException e) {}
final File htdocsReadme = new File(htDocsPath, "readme.txt");
if (!(htdocsReadme.exists())) try {FileUtils.copy((
"This is your root directory for individual Web Content\r\n" +
"\r\n" +
"Please place your html files into the www subdirectory.\r\n" +
"The URL of that path is either\r\n" +
"http://www.<your-peer-name>.yacy or\r\n" +
"http://<your-ip>:<your-port>/www\r\n" +
"\r\n" +
"Other subdirectories may be created; they map to corresponding sub-domains.\r\n" +
"This directory shares it's content with the applications htroot path, so you\r\n" +
"may access your yacy search page with\r\n" +
"http://<your-peer-name>.yacy/\r\n" +
"\r\n").getBytes(), htdocsReadme);} catch (final IOException e) {
System.out.println("Error creating htdocs readme: " + e.getMessage());
}
final File wwwDefaultPath = new File(htDocsPath, "www");
mkdirIfNeseccary(wwwDefaultPath);
final File shareDefaultPath = new File(htDocsPath, "share");
mkdirIfNeseccary(shareDefaultPath);
migration.migrate(sb, oldRev, newRev);
// delete old release files
final int deleteOldDownloadsAfterDays = (int) sb.getConfigLong("update.deleteOld", 30);
yacyRelease.deleteOldDownloads(sb.releasePath, deleteOldDownloadsAfterDays );
// set user-agent
HTTPClient.setDefaultUserAgent(ClientIdentification.getUserAgent());
// initial fill of the triplestore
File triplestore = new File(sb.getConfig("triplestore", new File(dataHome, "DATA/TRIPLESTORE").getAbsolutePath()));
mkdirIfNeseccary(triplestore);
for (String s: triplestore.list()) {
if ((s.endsWith(".rdf") || s.endsWith(".nt")) && !s.equals("local.rdf") && !s.endsWith("_triplestore.rdf") && !s.startsWith("private_store_")) {
try {
JenaTripleStore.load(new File(triplestore, s).getAbsolutePath());
} catch (IOException e) {
Log.logException(e);
}
}
}
if (sb.getConfigBool("triplestore.persistent", false)) {
File local = new File(triplestore, "local.rdf");
if (local.exists()) {
try {
JenaTripleStore.load(local.getAbsolutePath());
} catch (IOException e) {
Log.logException(e);
}
}
}
// start main threads
final String port = sb.getConfig("port", "8090");
try {
final HTTPDemon protocolHandler = new HTTPDemon(sb);
final serverCore server = new serverCore(
timeout /*control socket timeout in milliseconds*/,
true /* block attacks (wrong protocol) */,
protocolHandler /*command class*/,
sb,
30000 /*command max length incl. GET args*/);
server.setName("httpd:"+port);
server.setPriority(Thread.MAX_PRIORITY);
server.setObeyIntermission(false);
// start the server
sb.deployThread("10_httpd", "HTTPD Server/Proxy", "the HTTPD, used as web server and proxy", null, server, 0, 0, 0, 0);
//server.start();
// open the browser window
final boolean browserPopUpTrigger = sb.getConfig(SwitchboardConstants.BROWSER_POP_UP_TRIGGER, "true").equals("true");
if (browserPopUpTrigger) try {
final String browserPopUpPage = sb.getConfig(SwitchboardConstants.BROWSER_POP_UP_PAGE, "ConfigBasic.html");
//boolean properPW = (sb.getConfig("adminAccount", "").isEmpty()) && (sb.getConfig(httpd.ADMIN_ACCOUNT_B64MD5, "").length() > 0);
//if (!properPW) browserPopUpPage = "ConfigBasic.html";
Browser.openBrowser((server.withSSL()?"https":"http") + "://localhost:" + serverCore.getPortNr(port) + "/" + browserPopUpPage);
} catch (final Throwable e) {
// cannot open browser. This may be normal in headless environments
//Log.logException(e);
}
// enable browser popup, http server is ready now
sb.tray.setReady();
//regenerate Locales from Translationlist, if needed
final File locale_source = sb.getAppPath("locale.source", "locales");
final String lang = sb.getConfig("locale.language", "");
if (!lang.equals("") && !lang.equals("default")) { //locale is used
String currentRev = "";
try{
final BufferedReader br = new BufferedReader(new InputStreamReader(new FileInputStream(new File(sb.getDataPath("locale.translated_html", "DATA/LOCALE/htroot"), lang+"/version" ))));
currentRev = br.readLine();
br.close();
}catch(final IOException e){
//Error
}
if (!currentRev.equals(sb.getConfig("svnRevision", ""))) try { //is this another version?!
final File sourceDir = new File(sb.getConfig("htRootPath", "htroot"));
final File destDir = new File(sb.getDataPath("locale.translated_html", "DATA/LOCALE/htroot"), lang);
if (Translator.translateFilesRecursive(sourceDir, destDir, new File(locale_source, lang + ".lng"), "html,template,inc", "locale")){ //translate it
//write the new Versionnumber
final BufferedWriter bw = new BufferedWriter(new PrintWriter(new FileWriter(new File(destDir, "version"))));
bw.write(sb.getConfig("svnRevision", "Error getting Version"));
bw.close();
}
} catch (final IOException e) {}
}
// initialize number formatter with this locale
Formatter.setLocale(lang);
// registering shutdown hook
Log.logConfig("STARTUP", "Registering Shutdown Hook");
final Runtime run = Runtime.getRuntime();
run.addShutdownHook(new shutdownHookThread(Thread.currentThread(), sb));
// save information about available memory after all initializations
//try {
sb.setConfig("memoryFreeAfterInitBGC", MemoryControl.free());
sb.setConfig("memoryTotalAfterInitBGC", MemoryControl.total());
System.gc();
sb.setConfig("memoryFreeAfterInitAGC", MemoryControl.free());
sb.setConfig("memoryTotalAfterInitAGC", MemoryControl.total());
//} catch (ConcurrentModificationException e) {}
// wait for server shutdown
try {
sb.waitForShutdown();
} catch (final Exception e) {
Log.logSevere("MAIN CONTROL LOOP", "PANIC: " + e.getMessage(),e);
}
// shut down
Array.terminate();
Log.logConfig("SHUTDOWN", "caught termination signal");
server.terminate(false);
server.interrupt();
server.close();
// idle until the processes are down
if (server.isAlive()) {
server.interrupt();
}
Log.logConfig("SHUTDOWN", "server has terminated");
sb.close();
} catch (final Exception e) {
Log.logSevere("STARTUP", "Unexpected Error: " + e.getClass().getName(),e);
//System.exit(1);
}
if(lock != null) lock.release();
if(channel != null) channel.close();
} catch (final Exception ee) {
Log.logSevere("STARTUP", "FATAL ERROR: " + ee.getMessage(),ee);
} finally {
}
// save the triple store
if (sb.getConfigBool("triplestore.persistent", false)) {
JenaTripleStore.saveAll();
}
Log.logConfig("SHUTDOWN", "goodbye. (this is the last line)");
Log.shutdown();
shutdownSemaphore.release(1000);
try {
System.exit(0);
} catch (final Exception e) {} // was once stopped by de.anomic.net.ftpc$sm.checkExit(ftpc.java:1790)
}
/**
* @param f
*/
private static void delete(final File f) {
if(!f.delete())
Log.logSevere("STARTUP", "WARNING: the file " + f + " can not be deleted!");
}
/**
* @see File#mkdir()
* @param path
*/
private static void mkdirIfNeseccary(final File path) {
if (!(path.exists()))
if(!path.mkdir())
Log.logWarning("STARTUP", "could not create directory "+ path.toString());
}
/**
* @see File#mkdirs()
* @param path
*/
public static void mkdirsIfNeseccary(final File path) {
if (!(path.exists()))
if(!path.mkdirs())
Log.logWarning("STARTUP", "could not create directories "+ path.toString());
}
/**
* Loads the configuration from the data-folder.
* FIXME: Why is this called over and over again from every method, instead
* of setting the configurationdata once for this class in main?
*
* @param mes Where are we called from, so that the errormessages can be
* more descriptive.
* @param homePath Root-path where all the information is to be found.
* @return Properties read from the configurationfile.
*/
private static Properties configuration(final String mes, final File homePath) {
Log.logConfig(mes, "Application Root Path: " + homePath.toString());
// read data folder
final File dataFolder = new File(homePath, "DATA");
if (!(dataFolder.exists())) {
Log.logSevere(mes, "Application was never started or root path wrong.");
System.exit(-1);
}
final Properties config = new Properties();
FileInputStream fis = null;
try {
fis = new FileInputStream(new File(homePath, "DATA/SETTINGS/yacy.conf"));
config.load(fis);
} catch (final FileNotFoundException e) {
Log.logSevere(mes, "could not find configuration file.");
System.exit(-1);
} catch (final IOException e) {
Log.logSevere(mes, "could not read configuration file.");
System.exit(-1);
} finally {
if(fis != null) {
try {
fis.close();
} catch (final IOException e) {
Log.logException(e);
}
}
}
return config;
}
/**
* Call the shutdown-page of YaCy to tell it to shut down. This method is
* called if you start yacy with the argument -shutdown.
*
* @param homePath Root-path where all the information is to be found.
*/
public static void shutdown(final File homePath) {
// start up
System.out.println(copyright);
System.out.println(hline);
submitURL(homePath, "Steering.html?shutdown=", "Terminate YaCy");
}
public static void update(final File homePath) {
// start up
System.out.println(copyright);
System.out.println(hline);
submitURL(homePath, "ConfigUpdate_p.html?autoUpdate=", "Update YaCy to most recent version");
}
private static void submitURL(final File homePath, final String path, final String processdescription) {
final Properties config = configuration("COMMAND-STEERING", homePath);
// read port
final int port = serverCore.getPortNr(config.getProperty("port", "8090"));
// read password
String encodedPassword = (String) config.get(SwitchboardConstants.ADMIN_ACCOUNT_B64MD5);
if (encodedPassword == null) encodedPassword = ""; // not defined
// send 'wget' to web interface
final RequestHeader requestHeader = new RequestHeader();
requestHeader.put(RequestHeader.AUTHORIZATION, "realm=" + encodedPassword); // for http-authentify
// final Client con = new Client(10000, requestHeader);
final HTTPClient con = new HTTPClient();
con.setHeader(requestHeader.entrySet());
// ResponseContainer res = null;
try {
// res = con.GET("http://localhost:"+ port +"/" + path);
con.GETbytes("http://localhost:"+ port +"/" + path);
// read response
// if (res.getStatusLine().startsWith("2")) {
if (con.getStatusCode() > 199 && con.getStatusCode() < 300) {
Log.logConfig("COMMAND-STEERING", "YACY accepted steering command: " + processdescription);
// final ByteArrayOutputStream bos = new ByteArrayOutputStream(); //This is stream is not used???
// try {
// FileUtils.copyToStream(new BufferedInputStream(res.getDataAsStream()), new BufferedOutputStream(bos));
// } finally {
// res.closeStream();
// }
} else {
// Log.logSevere("COMMAND-STEERING", "error response from YACY socket: " + res.getStatusLine());
Log.logSevere("COMMAND-STEERING", "error response from YACY socket: " + con.getHttpResponse().getStatusLine());
System.exit(-1);
}
} catch (final IOException e) {
Log.logSevere("COMMAND-STEERING", "could not establish connection to YACY socket: " + e.getMessage());
System.exit(-1);
// } finally {
// // release connection
// if(res != null) {
// res.closeStream();
// }
}
try {
HTTPClient.closeConnectionManager();
} catch (final InterruptedException e) {
e.printStackTrace();
}
// finished
Log.logConfig("COMMAND-STEERING", "SUCCESSFULLY FINISHED COMMAND: " + processdescription);
}
/**
* Main-method which is started by java. Checks for special arguments or
* starts up the application.
*
* @param args
* Given arguments from the command line.
*/
public static void main(String args[]) {
try {
// check assertion status
//ClassLoader.getSystemClassLoader().setDefaultAssertionStatus(true);
boolean assertionenabled = false;
assert assertionenabled = true;
if (assertionenabled) System.out.println("Asserts are enabled");
// check memory amount
System.gc();
final long startupMemFree = MemoryControl.free();
final long startupMemTotal = MemoryControl.total();
// maybe go into headless awt mode: we have three cases depending on OS and one exception:
// windows : better do not go into headless mode
// mac : go into headless mode because an application is shown in gui which may not be wanted
// linux : go into headless mode because this does not need any head operation
// exception : if the -gui option is used then do not go into headless mode since that uses a gui
boolean headless = true;
if (OS.isWindows) headless = false;
if (args.length >= 1 && args[0].toLowerCase().equals("-gui")) headless = false;
System.setProperty("java.awt.headless", headless ? "true" : "false");
String s = ""; for (final String a: args) s += a + " ";
yacyRelease.startParameter = s.trim();
File applicationRoot = new File(System.getProperty("user.dir").replace('\\', '/'));
File dataRoot = applicationRoot;
//System.out.println("args.length=" + args.length);
//System.out.print("args=["); for (int i = 0; i < args.length; i++) System.out.print(args[i] + ", "); System.out.println("]");
if ((args.length >= 1) && (args[0].toLowerCase().equals("-startup") || args[0].equals("-start"))) {
// normal start-up of yacy
if (args.length > 1) dataRoot = new File(System.getProperty("user.home").replace('\\', '/'), args[1]);
startup(dataRoot, applicationRoot, startupMemFree, startupMemTotal, false);
} else if (args.length >= 1 && args[0].toLowerCase().equals("-gui")) {
// start-up of yacy with gui
if (args.length > 1) dataRoot = new File(System.getProperty("user.home").replace('\\', '/'), args[1]);
startup(dataRoot, applicationRoot, startupMemFree, startupMemTotal, true);
} else if ((args.length >= 1) && ((args[0].toLowerCase().equals("-shutdown")) || (args[0].equals("-stop")))) {
// normal shutdown of yacy
if (args.length == 2) applicationRoot= new File(args[1]);
shutdown(applicationRoot);
} else if ((args.length >= 1) && (args[0].toLowerCase().equals("-update"))) {
// aut-update yacy
if (args.length == 2) applicationRoot= new File(args[1]);
update(applicationRoot);
} else if ((args.length >= 1) && (args[0].toLowerCase().equals("-version"))) {
// show yacy version
System.out.println(copyright);
} else {
if (args.length == 1) applicationRoot= new File(args[0]);
startup(dataRoot, applicationRoot, startupMemFree, startupMemTotal, false);
}
} finally {
Log.shutdown();
}
}
}
/**
* This class is a helper class whose instance is started, when the java virtual
* machine shuts down. Signals the plasmaSwitchboard to shut down.
*/
class shutdownHookThread extends Thread {
private final Switchboard sb;
private final Thread mainThread;
public shutdownHookThread(final Thread mainThread, final Switchboard sb) {
super();
this.sb = sb;
this.mainThread = mainThread;
}
@Override
public void run() {
try {
if (!this.sb.isTerminated()) {
Log.logConfig("SHUTDOWN","Shutdown via shutdown hook.");
// sending the yacy main thread a shutdown signal
Log.logFine("SHUTDOWN","Signaling shutdown to the switchboard.");
this.sb.terminate("shutdown hook");
// waiting for the yacy thread to finish execution
Log.logFine("SHUTDOWN","Waiting for main thread to finish.");
if (this.mainThread.isAlive() && !this.sb.isTerminated()) {
this.mainThread.join();
}
}
} catch (final Exception e) {
Log.logSevere("SHUTDOWN","Unexpected error. " + e.getClass().getName(),e);
}
}
}