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/* This file is part of VoltDB.
* Copyright (C) 2008-2018 VoltDB Inc.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as
* published by the Free Software Foundation, either version 3 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 Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with VoltDB. If not, see .
*/
package org.voltcore.logging;
import java.io.File;
import java.lang.reflect.Constructor;
import java.lang.reflect.Method;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.LinkedBlockingQueue;
import java.util.concurrent.RejectedExecutionException;
import java.util.concurrent.ThreadFactory;
import java.util.concurrent.ThreadPoolExecutor;
import java.util.concurrent.TimeUnit;
import org.voltcore.logging.VoltNullLogger.CoreNullLogger;
import org.voltcore.utils.EstTime;
import org.voltcore.utils.RateLimitedLogger;
import com.google_voltpatches.common.base.Throwables;
/**
* Class that implements the core functionality of a Log4j logger
* or a java.util.logging logger. The point is that it should work
* whether log4j is in the classpath or not. New VoltDB code should
* avoid log4j wherever possible.
*/
public class VoltLogger {
final CoreVoltLogger m_logger;
private static final String ASYNCH_LOGGER_THREAD_NAME = "Async Logger";
/// A thread factory implementation customized for asynchronous logging tasks.
/// This class and its use to initialize m_asynchLoggerPool bypasses similar code in CoreUtils.
/// Duplicating that functionality seemed less bad than maintaining potentially circular
/// dependencies between the static initializers here and those in CoreUtils.
/// Such dependencies were implicated in a mysterious platform-specific hang.
/// Also, the CoreUtils code will LOG any exception thrown by the launched runnable.
/// That seems like a bad idea in this case, since the failed runnable in question is
/// responsible for logging.
/// Here, for simplicity, the runnables provided by the callers of submit or execute
/// take responsibility for their own blanket exception catching.
/// They fall back to writing a complaint to System.err on the assumption that logging
/// is seriously broken and unusable.
private static class LoggerThreadFactory implements ThreadFactory {
private static final int SMALL_STACK_SIZE = 1024 * 256;
@Override
public synchronized Thread newThread(final Runnable runnable) {
Thread t = new Thread(null, runnable, ASYNCH_LOGGER_THREAD_NAME, SMALL_STACK_SIZE);
t.setDaemon(true);
return t;
}
};
// The pool containing the logger thread(s) or null if asynch logging is disabled so that
// all logging takes place synchronously on the caller's thread.
private static ExecutorService m_asynchLoggerPool =
// out for no async logging
Boolean.getBoolean("DISABLE_ASYNC_LOGGING") ?
null :
// quick out for when we want no logging whatsoever
"true".equals(System.getProperty("voltdb_no_logging")) ?
null :
new ThreadPoolExecutor(1, 1, 0L, TimeUnit.MILLISECONDS, new LinkedBlockingQueue(),
new LoggerThreadFactory());
/// ShutdownHooks calls shutdownAsynchronousLogging when it is finished running its hooks
/// just before executing its final action -- which is typically to shutdown Log4J logging.
/// Since ShutdownHooks potentially makes some (minimal) use of logging during its
/// shutdown task processing, so it already has a VoltLogger dependency, hard-coding a
/// direct call to shutdownAsynchronousLogging is simpler than trying to register this step
/// as a generic high-priority shutdown hook.
public static synchronized void shutdownAsynchronousLogging() {
if (m_asynchLoggerPool != null) {
try {
// Submit and wait on an empty logger task to flush the queue.
m_asynchLoggerPool.submit(new Runnable() {
@Override
public void run() {}
}).get();
} catch (Exception e) {
Throwables.getRootCause(e).printStackTrace();
}
// Any logging that falls after the official shutdown flush of the
// asynch logger can just fall back to synchronous on the caller thread.
m_asynchLoggerPool.shutdown();
try {
m_asynchLoggerPool.awaitTermination(365, TimeUnit.DAYS);
} catch (InterruptedException e) {
throw new RuntimeException("Unable to shutdown VoltLogger", e);
}
m_asynchLoggerPool = null;
}
}
public static synchronized void startAsynchronousLogging(){
// quick out for when we want no logging whatsoever
if ("true".equals(System.getProperty("voltdb_no_logging"))) {
return;
}
if (m_asynchLoggerPool == null && !Boolean.getBoolean("DISABLE_ASYNC_LOGGING")) {
m_asynchLoggerPool = new ThreadPoolExecutor(
1, 1, 0L, TimeUnit.MILLISECONDS,
new LinkedBlockingQueue(),
new LoggerThreadFactory());
try {
m_asynchLoggerPool.submit(new Runnable() {
@Override
public void run() {}
}).get();
} catch (InterruptedException | ExecutionException e) {
throw new RuntimeException("Unable to prime asynchronous logging", e);
}
}
}
/**
* Abstraction of core functionality shared between Log4j and
* java.util.logging.
*/
static interface CoreVoltLogger {
public boolean isEnabledFor(Level level);
public void log(Level level, Object message, Throwable t);
public void l7dlog(Level level, String key, Object[] params, Throwable t);
public long getLogLevels(VoltLogger loggers[]);
public void setLevel(Level level);
}
/*
* Submit a task asynchronously to the thread to preserve message order,
* and wait for the task to complete.
*/
private void submit(final Level level, final Object message, final Throwable t) {
if (!m_logger.isEnabledFor(level)) return;
if (m_asynchLoggerPool == null) {
m_logger.log(level, message, t);
return;
}
final Runnable runnableLoggingTask = createRunnableLoggingTask(level, message, t);
try {
m_asynchLoggerPool.submit(runnableLoggingTask).get();
} catch (Exception e) {
Throwables.propagate(e);
}
}
/*
* Submit a task asynchronously to the thread to preserve message order,
* but don't wait for the task to complete for info, debug, trace, and warn
*/
private void execute(final Level level, final Object message, final Throwable t) {
if (!m_logger.isEnabledFor(level)) return;
if (m_asynchLoggerPool == null) {
m_logger.log(level, message, t);
return;
}
final Runnable runnableLoggingTask = createRunnableLoggingTask(level, message, t);
try {
m_asynchLoggerPool.execute(runnableLoggingTask);
} catch (RejectedExecutionException e) {
m_logger.log(Level.DEBUG, "Failed to execute logging task. Running in-line", e);
runnableLoggingTask.run();
}
}
/**
* Generate a runnable task that logs one message in an exception-safe way.
* @param level
* @param message
* @param t
* @param callerThreadName
* @return
*/
private Runnable createRunnableLoggingTask(final Level level,
final Object message, final Throwable t) {
// While logging, the logger thread temporarily disguises itself as its caller.
final String callerThreadName = Thread.currentThread().getName();
final Runnable runnableLoggingTask = new Runnable() {
@Override
public void run() {
Thread loggerThread = Thread.currentThread();
loggerThread.setName(callerThreadName);
try {
m_logger.log(level, message, t);
} catch (Throwable t) {
System.err.println("Exception thrown in logging thread for " +
callerThreadName + ":" + t);
} finally {
loggerThread.setName(ASYNCH_LOGGER_THREAD_NAME);
}
}
};
return runnableLoggingTask;
}
private void submitl7d(final Level level, final String key, final Object[] params, final Throwable t) {
if (!m_logger.isEnabledFor(level)) {
return;
}
if (m_asynchLoggerPool == null) {
m_logger.l7dlog(level, key, params, t);
return;
}
final Runnable runnableLoggingTask = createRunnableL7dLoggingTask(level, key, params, t);
switch (level) {
case INFO:
case WARN:
case DEBUG:
case TRACE:
m_asynchLoggerPool.execute(runnableLoggingTask);
break;
case FATAL:
case ERROR:
try {
m_asynchLoggerPool.submit(runnableLoggingTask).get();
} catch (Exception e) {
Throwables.propagate(e);
}
break;
default:
throw new AssertionError("Unrecognized level " + level);
}
}
/**
* Generate a runnable task that logs one localized message in an exception-safe way.
* @param level
* @param message
* @param t
* @param callerThreadName
* @return
*/
private Runnable createRunnableL7dLoggingTask(final Level level,
final String key, final Object[] params, final Throwable t) {
// While logging, the logger thread temporarily disguises itself as its caller.
final String callerThreadName = Thread.currentThread().getName();
final Runnable runnableLoggingTask = new Runnable() {
@Override
public void run() {
Thread loggerThread = Thread.currentThread();
loggerThread.setName(callerThreadName);
try {
m_logger.l7dlog(level, key, params, t);
} catch (Throwable t) {
System.err.println("Exception thrown in logging thread for " +
callerThreadName + ":" + t);
} finally {
loggerThread.setName(ASYNCH_LOGGER_THREAD_NAME);
}
}
};
return runnableLoggingTask;
}
public void debug(Object message) {
execute(Level.DEBUG, message, null);
}
public void debug(Object message, Throwable t) {
execute(Level.DEBUG, message, t);
}
public boolean isDebugEnabled() {
return m_logger.isEnabledFor(Level.DEBUG);
}
public void error(Object message) {
submit(Level.ERROR, message, null);
}
public void error(Object message, Throwable t) {
submit(Level.ERROR, message, t);
}
public void fatal(Object message) {
submit(Level.FATAL, message, null);
}
public void fatal(Object message, Throwable t) {
submit(Level.FATAL, message, t);
}
public void info(Object message) {
execute(Level.INFO, message, null);
}
public void info(Object message, Throwable t) {
execute(Level.INFO, message, t);
}
public boolean isInfoEnabled() {
return m_logger.isEnabledFor(Level.INFO);
}
public void trace(Object message) {
execute(Level.TRACE, message, null);
}
public void trace(Object message, Throwable t) {
execute(Level.TRACE, message, t);
}
public boolean isTraceEnabled() {
return m_logger.isEnabledFor(Level.TRACE);
}
public void warn(Object message) {
execute(Level.WARN, message, null);
}
public void warn(Object message, Throwable t) {
execute(Level.WARN, message, t);
}
public void l7dlog(final Level level, final String key, final Throwable t) {
submitl7d(level, key, null, t);
}
public void l7dlog(final Level level, final String key, final Object[] params, final Throwable t) {
submitl7d(level, key, params, t);
}
public long getLogLevels(VoltLogger loggers[]) {
return m_logger.getLogLevels(loggers);
}
public void setLevel(Level level) {
m_logger.setLevel(level);
}
/**
* Static method to change the Log4j config globally. This fails
* if you're not using Log4j for now.
* @param xmlConfig The text of a Log4j config file.
* @param voltroot The VoltDB root path
*/
public static void configure(String xmlConfig, File voltroot) {
try {
Class loggerClz = Class.forName("org.voltcore.logging.VoltLog4jLogger");
assert(loggerClz != null);
Method configureMethod = loggerClz.getMethod("configure", String.class, File.class);
configureMethod.invoke(null, xmlConfig, voltroot);
} catch (Exception e) {}
}
/**
* Try to load the Log4j logger without importing it. Eventually support
* graceful failback to java.util.logging.
* @param classname The id of the logger.
*/
public VoltLogger(String classname) {
// quick out for when we want no logging whatsoever
if ("true".equals(System.getProperty("voltdb_no_logging"))) {
m_logger = new CoreNullLogger();
return;
}
CoreVoltLogger tempLogger = null;
// try to load the Log4j logger without importing it
// any exception thrown will just keep going
try {
Class loggerClz = Class.forName("org.voltcore.logging.VoltLog4jLogger");
assert(loggerClz != null);
Constructor constructor = loggerClz.getConstructor(String.class);
tempLogger = (CoreVoltLogger) constructor.newInstance(classname);
}
catch (Exception e) {}
catch (LinkageError e) {}
// if unable to load Log4j, use java.util.logging
if (tempLogger == null) {
tempLogger = new VoltUtilLoggingLogger(classname);
}
// set the final variable for the core logger
m_logger = tempLogger;
}
/**
* Constructor used by VoltNullLogger
*/
protected VoltLogger(CoreVoltLogger logger) {
assert(logger != null);
m_logger = logger;
}
public void rateLimitedLog(long suppressInterval, Level level, Throwable cause, String format, Object...args) {
RateLimitedLogger.tryLogForMessage(
EstTime.currentTimeMillis(),
suppressInterval, TimeUnit.SECONDS,
this, level,
cause, format, args
);
}
}
