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// Copyright 2017 Yahoo Holdings. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.logserver;
import com.yahoo.io.FatalErrorHandler;
import com.yahoo.io.Listener;
import com.yahoo.log.LogLevel;
import com.yahoo.log.LogSetup;
import com.yahoo.log.event.Event;
import com.yahoo.logserver.handlers.HandlerThread;
import com.yahoo.logserver.handlers.LogHandler;
import com.yahoo.logserver.net.LogConnectionFactory;
import com.yahoo.logserver.net.control.Levels;
import com.yahoo.yolean.system.CatchSignals;
import java.io.IOException;
import java.util.HashMap;
import java.util.concurrent.atomic.AtomicBoolean;
import java.util.logging.Level;
import java.util.logging.Logger;
/**
* This class implements the log server itself. At present there is
* no runtime configuration; the server starts up, binds port 19081
* and loads builtin plugins.
*
* @author Bjorn Borud
* @author Stig Bakken
*/
public class Server implements Runnable {
private final AtomicBoolean signalCaught = new AtomicBoolean(false);
static final String APPNAME = "logserver";
private static final Server instance = new Server();
private static final Logger log = Logger.getLogger(Server.class.getName());
private static final FatalErrorHandler fatalErrorHandler = new FatalErrorHandler();
private static final HashMap<String, HandlerThread> handlerThreads = new HashMap<>();
private static final HashMap<LogHandler, String> threadNameForHandler = new HashMap<>();
static {
LogSetup.initVespaLogging("ADM");
}
// the port is a String because we want to use it as the default
// value of a System.getProperty().
private static final String LISTEN_PORT = "19081";
private int listenPort;
private Listener listener;
private final LogDispatcher dispatch;
private final boolean isInitialized;
private Server() {
dispatch = new LogDispatcher();
dispatch.setBatchedMode(true);
isInitialized = false;
}
public static Server getInstance() {
return instance;
}
private HandlerThread getHandlerThread(String threadName) {
threadName += " handler thread";
HandlerThread ht = handlerThreads.get(threadName);
if (ht == null) {
ht = new HandlerThread(threadName);
handlerThreads.put(threadName, ht);
ht.setFatalErrorHandler(fatalErrorHandler);
dispatch.registerLogHandler(ht);
}
return ht;
}
private void registerPluginLoader(PluginLoader loader) {
loader.loadPlugins();
}
public void registerLogHandler(LogHandler lh, String threadName) {
HandlerThread ht = getHandlerThread(threadName);
ht.registerHandler(lh);
threadNameForHandler.put(lh, threadName);
}
public void unregisterLogHandler(LogHandler lh) {
String threadName = threadNameForHandler.get(lh);
unregisterLogHandler(lh, threadName);
}
private void unregisterLogHandler(LogHandler lh, String threadName) {
HandlerThread ht = getHandlerThread(threadName);
ht.unregisterHandler(lh);
threadNameForHandler.remove(lh);
}
public void registerFlusher(LogHandler lh) {
Flusher.register(lh);
}
/**
* Included only for consistency
*/
public void unregisterFlusher(LogHandler lh) {
/* NOP */
}
/**
* Initialize the server and start up all its plugins,
*
* @param listenPort The port on which the logserver accepts log
* messages.
*/
public void initialize(int listenPort) {
if (isInitialized) {
throw new IllegalStateException(APPNAME + " already initialized");
}
this.listenPort = listenPort;
// plugins
registerPluginLoader(new BuiltinPluginLoader());
// main listener
listener = new Listener(APPNAME);
listener.addSelectLoopPostHook(dispatch);
listener.setFatalErrorHandler(fatalErrorHandler);
}
/**
* Sets up the listen port and starts the Listener. Then waits for
* Listener to exit.
*/
public void run() {
try {
listener.listen(new LogConnectionFactory(dispatch), listenPort);
log.log(LogLevel.CONFIG, APPNAME + ".listenport=" + listenPort);
} catch (IOException e) {
log.log(LogLevel.ERROR, "Unable to initialize", e);
return;
}
log.fine("Starting listener...");
listener.start();
Event.started(APPNAME);
try {
listener.join();
log.fine("listener thread exited");
} catch (InterruptedException e) {
log.log(Level.WARNING, "Server was interrupted", e);
}
}
private void setupSignalHandler() {
CatchSignals.setup(signalCaught); // catch termination and interrupt signals
}
private void waitForShutdown() {
synchronized (signalCaught) {
while (! signalCaught.get()) {
try {
signalCaught.wait();
} catch (InterruptedException e) {
// empty
}
}
}
Event.stopping(APPNAME, "shutdown");
dispatch.close();
Event.stopped(APPNAME, 0, 0);
System.exit(0);
}
static HashMap<LogHandler, String> threadNameForHandler() {
return threadNameForHandler;
}
static void help() {
System.out.println();
System.out.println("System properties:");
System.out.println(" - " + APPNAME + ".listenport (" + LISTEN_PORT + ")");
System.out.println(" - " + APPNAME + ".queue.size (" + HandlerThread.DEFAULT_QUEUESIZE + ")");
System.out.println(" - logserver.default.loglevels (" + (new Levels()).toString() + ")");
System.out.println();
}
public static void main(String[] args) {
if (args.length > 0 && "-help".equals(args[0])) {
help();
System.exit(0);
}
String portString = System.getProperty(APPNAME + ".listenport", LISTEN_PORT);
Server server = Server.getInstance();
server.setupSignalHandler();
server.initialize(Integer.parseInt(portString));
Thread t = new Thread(server, "logserver main");
t.start();
server.waitForShutdown();
}
}
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