/src/logging-log4cxx/src/main/cpp/hierarchy.cpp

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/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

#include <log4cxx/hierarchy.h>
#if LOG4CXX_ABI_VERSION <= 15
#include <log4cxx/defaultloggerfactory.h>
#endif
#include <log4cxx/helpers/loglog.h>
#include <log4cxx/appender.h>
#include <log4cxx/helpers/stringhelper.h>
#include <log4cxx/spi/rootlogger.h>
#include <algorithm>
#include <map>
#include <mutex>
#include <vector>


using namespace LOG4CXX_NS;
using namespace LOG4CXX_NS::spi;
using namespace LOG4CXX_NS::helpers;


typedef std::map<LogString, LoggerPtr> LoggerMap;
typedef std::map<LogString, ProvisionNode> ProvisionNodeMap;

struct Hierarchy::HierarchyPrivate
{
  HierarchyPrivate()
    : configured(false)
    , emittedNoAppenderWarning(false)
    , emittedNoResourceBundleWarning(false)
    , thresholdInt(Level::ALL_INT)
  {
  }

  helpers::Pool pool;
  mutable std::recursive_mutex mutex;
  mutable std::mutex configuredMutex;
  bool configured;
  bool emittedNoAppenderWarning;
  bool emittedNoResourceBundleWarning;
  int thresholdInt;

  spi::HierarchyEventListenerList listeners;
  LoggerPtr root;
  LevelPtr threshold;
  LoggerMap loggers;
  ProvisionNodeMap provisionNodes;

  std::vector<AppenderPtr> allAppenders;

  mutable std::mutex listenerMutex;
};

IMPLEMENT_LOG4CXX_OBJECT(Hierarchy)

Hierarchy::Hierarchy() :
  m_priv(std::make_unique<HierarchyPrivate>())
{
}

Hierarchy::~Hierarchy()
{
  std::lock_guard<std::recursive_mutex> lock(m_priv->mutex);
  for (auto& item : m_priv->loggers)
  {
    if (auto& pLogger = item.second)
    {
      pLogger->removeHierarchy();
      pLogger->removeAllAppenders();
    }
  }
  if (m_priv->root)
  {
    m_priv->root->removeHierarchy();
    m_priv->root->removeAllAppenders();
  }
}

void Hierarchy::addHierarchyEventListener(const spi::HierarchyEventListenerPtr& listener)
{
  std::lock_guard<std::mutex> lock(m_priv->listenerMutex);

  if (std::find(m_priv->listeners.begin(), m_priv->listeners.end(), listener) != m_priv->listeners.end())
  {
    LogLog::warn(LOG4CXX_STR("Ignoring attempt to add an existent listener."));
  }
  else
  {
    m_priv->listeners.push_back(listener);
  }
}

void Hierarchy::removeHierarchyEventListener(const spi::HierarchyEventListenerPtr& listener)
{
  std::lock_guard<std::mutex> lock(m_priv->listenerMutex);

    auto found = std::find(m_priv->listeners.begin(), m_priv->listeners.end(), listener);
    if(found != m_priv->listeners.end()){
        m_priv->listeners.erase(found);
    }
}

void Hierarchy::clear()
{
  std::lock_guard<std::recursive_mutex> lock(m_priv->mutex);
  m_priv->loggers.clear();
}

void Hierarchy::emitNoAppenderWarning(const Logger* logger)
{
  bool emitWarning = false;
  {
    std::lock_guard<std::recursive_mutex> lock(m_priv->mutex);
    emitWarning = !m_priv->emittedNoAppenderWarning;
    m_priv->emittedNoAppenderWarning = true;
  }

  // No appender in hierarchy, warn user only once.
  if (emitWarning)
  {
    LogLog::warn(((LogString) LOG4CXX_STR("No appender could be found for logger ("))
      + logger->getName() + LOG4CXX_STR(")."));
    LogLog::warn(LOG4CXX_STR("Please initialize the log4cxx system properly."));
  }
}


LoggerPtr Hierarchy::exists(const LogString& name)
{
  std::lock_guard<std::recursive_mutex> lock(m_priv->mutex);

  LoggerPtr logger;
  LoggerMap::iterator it = m_priv->loggers.find(name);

  if (it != m_priv->loggers.end())
  {
    logger = it->second;
  }


  return logger;
}

void Hierarchy::setThreshold(const LevelPtr& l)
{
  if (l != 0)
  {
    std::lock_guard<std::recursive_mutex> lock(m_priv->mutex);
    setThresholdInternal(l);
  }
}

void Hierarchy::setThreshold(const LogString& levelStr)
{
  LevelPtr l(Level::toLevelLS(levelStr, 0));

  if (l != 0)
  {
    setThreshold(l);
  }
  else
  {
    LogLog::warn(((LogString) LOG4CXX_STR("No level could be found named \""))
      + levelStr + LOG4CXX_STR("\"."));
  }
}

void Hierarchy::setThresholdInternal(const LevelPtr& l)
{
  m_priv->thresholdInt = l->toInt();
  m_priv->threshold = l;

  if (m_priv->thresholdInt != Level::ALL_INT)
  {
    m_priv->configured = true;
  }
}

void Hierarchy::fireAddAppenderEvent(const Logger* logger, const Appender* appender)
{
  setConfigured(true);
  HierarchyEventListenerList clonedList;
  {
    std::lock_guard<std::mutex> lock(m_priv->listenerMutex);
    clonedList = m_priv->listeners;
  }

  for (auto& item : clonedList)
    item->addAppenderEvent(logger, appender);
}

void Hierarchy::fireRemoveAppenderEvent(const Logger* logger, const Appender* appender)

{
  HierarchyEventListenerList clonedList;
  {
    std::lock_guard<std::mutex> lock(m_priv->listenerMutex);
    clonedList = m_priv->listeners;
  }
  for (auto& item : clonedList)
    item->removeAppenderEvent(logger, appender);
}

LevelPtr Hierarchy::getThreshold() const
{
  return m_priv->threshold ? m_priv->threshold : Level::getAll();
}

LoggerPtr Hierarchy::getLogger(const LogString& name)
{
#if LOG4CXX_ABI_VERSION <= 15
  static WideLife<spi::LoggerFactoryPtr> defaultFactory = std::make_shared<DefaultLoggerFactory>();
#else
  static WideLife<spi::LoggerFactoryPtr> defaultFactory = std::make_shared<LoggerFactory>();
#endif
  return getLogger(name, defaultFactory);
}

LoggerPtr Hierarchy::getLogger(const LogString& name,
  const spi::LoggerFactoryPtr& factory)
{
  auto root = getRootLogger();
  std::lock_guard<std::recursive_mutex> lock(m_priv->mutex);

  LoggerMap::iterator it = m_priv->loggers.find(name);
  LoggerPtr result;

  if (it != m_priv->loggers.end())
  {
    result = it->second;
  }
  if (!result && factory)
  {
#if LOG4CXX_ABI_VERSION <= 15
    LoggerPtr logger(factory->makeNewLoggerInstance(m_priv->pool, name));
#else
    LoggerPtr logger(factory->makeNewLoggerInstance(name));
#endif
    logger->setHierarchy(this);
    m_priv->loggers.insert(LoggerMap::value_type(name, logger));

    ProvisionNodeMap::iterator it2 = m_priv->provisionNodes.find(name);

    if (it2 != m_priv->provisionNodes.end())
    {
      updateChildren(it2->second, logger);
      m_priv->provisionNodes.erase(it2);
    }

    updateParents(logger, root);
    result = logger;
  }
  return result;

}

LoggerList Hierarchy::getCurrentLoggers() const
{
  std::lock_guard<std::recursive_mutex> lock(m_priv->mutex);

  LoggerList v;
  for (auto& item : m_priv->loggers)
  {
    if (auto pLogger = item.second)
      v.push_back(pLogger);
  }
  return v;
}

LoggerPtr Hierarchy::getRootLogger() const
{
  std::lock_guard<std::recursive_mutex> lock(m_priv->mutex);
  if (!m_priv->root)
  {
    m_priv->root = std::make_shared<RootLogger>(Level::getDebug());
    m_priv->root->setHierarchy(const_cast<Hierarchy*>(this));
  }

  return m_priv->root;
}

bool Hierarchy::isDisabled(int level) const
{
  return m_priv->thresholdInt > level;
}

void Hierarchy::ensureIsConfigured(std::function<void()> configurator)
{
  std::lock_guard<std::mutex> lock(m_priv->configuredMutex);
  if (!m_priv->configured)
  {
    configurator();
    m_priv->configured = true;
  }
}

void Hierarchy::resetConfiguration()
{
  std::lock_guard<std::recursive_mutex> lock(m_priv->mutex);

  if (m_priv->root)
  {
    m_priv->root->setLevel(Level::getDebug());
    m_priv->root->setResourceBundle(0);
  }
  setThresholdInternal(Level::getAll());

  shutdownInternal();

  for (auto& item : m_priv->loggers)
  {
    if (auto pLogger = item.second)
    {
      pLogger->setLevel(0);
      pLogger->setAdditivity(true);
      pLogger->setResourceBundle(0);
    }
  }
}

void Hierarchy::shutdown()
{
  std::lock_guard<std::recursive_mutex> lock(m_priv->mutex);

  shutdownInternal();
}

void Hierarchy::shutdownInternal()
{
  m_priv->configured = false;

  // begin by closing nested appenders
  if (m_priv->root)
    m_priv->root->closeNestedAppenders();

  for (auto& item : m_priv->loggers)
  {
    if (auto pLogger = item.second)
      pLogger->closeNestedAppenders();
  }

  // then, remove all appenders
  if (m_priv->root)
    m_priv->root->removeAllAppenders();

  for (auto& item : m_priv->loggers)
  {
    if (auto pLogger = item.second)
      pLogger->removeAllAppenders();
  }
}

void Hierarchy::updateParents(const LoggerPtr& logger, const LoggerPtr& root)
{
  const LogString name(logger->getName());
  size_t length = name.size();
  bool parentFound = false;


  // if name = "w.x.y.z", loop through "w.x.y", "w.x" and "w", but not "w.x.y.z"
  for (size_t i = name.find_last_of(0x2E /* '.' */, length - 1);
    (i != LogString::npos) && (i != 0);
    i = name.find_last_of(0x2E /* '.' */, i - 1))
  {
    LogString substr = name.substr(0, i);

    LoggerMap::iterator it = m_priv->loggers.find(substr);

    if (it != m_priv->loggers.end())
    {
      parentFound = true;
      logger->setParent( it->second );
      break; // no need to update the ancestors of the closest ancestor
    }
    else
    {
      ProvisionNodeMap::iterator it2 = m_priv->provisionNodes.find(substr);

      if (it2 != m_priv->provisionNodes.end())
      {
        it2->second.push_back(logger);
      }
      else
      {
        ProvisionNode node(1, logger);
        m_priv->provisionNodes.insert(
          ProvisionNodeMap::value_type(substr, node));
      }
    }
  }

  // If we could not find any existing parents, then link with root.
  if (!parentFound)
  {
    logger->setParent( root );
  }
}

void Hierarchy::updateChildren(ProvisionNode& pn, const LoggerPtr& logger)
{
  for (auto& l : pn)
  {
    // Unless this child already points to a correct (lower) parent,
    // make logger.parent point to l.parent and l.parent to logger.
    if (!StringHelper::startsWith(l->getParent()->getName(), logger->getName()))
    {
      logger->setParent( l->getParent() );
      l->setParent( logger );
    }
  }
    
}

void Hierarchy::updateChildren(const Logger* parent)
{
  for (auto& item : m_priv->loggers)
  {
    for (auto l = item.second; l; l = l->getParent())
    {
      if (l->getParent().get() == parent)
      {
        item.second->updateThreshold();
        break;
      }
    }
  }
}

void Hierarchy::setConfigured(bool newValue)
{
  std::unique_lock<std::mutex> lock(m_priv->configuredMutex, std::try_to_lock);
  if (lock.owns_lock()) // Not being auto-configured?
    m_priv->configured = newValue;
}

bool Hierarchy::isConfigured()
{
  std::lock_guard<std::mutex> lock(m_priv->configuredMutex); // Blocks while auto-configuration is active
  return m_priv->configured;
}

HierarchyPtr Hierarchy::create()
{
  HierarchyPtr ret(new Hierarchy);
  return ret;
}

void Hierarchy::clearAppenders()
{
  m_priv->allAppenders.clear();
}

void Hierarchy::addAppender(AppenderPtr appender)
{
  m_priv->allAppenders.push_back(appender);
}

bool Hierarchy::removeLogger(const LogString& name, bool ifNotUsed)
{
  auto parentRefCount = [this](const LoggerPtr& child) -> int
  {
    int result = 0;
    for (auto& node : m_priv->provisionNodes)
    {
      if (node.second.end() != std::find(node.second.begin(), node.second.end(), child))
        ++result;
    }
    return result;
  };
  bool result = false;
  std::lock_guard<std::recursive_mutex> lock(m_priv->mutex);
  auto it = m_priv->loggers.find(name);
  if (it == m_priv->loggers.end())
    ;
  else if (ifNotUsed && 1 + parentRefCount(it->second) < it->second.use_count())
    ;
  else
  {
    for (auto& node : m_priv->provisionNodes)
    {
      for (size_t i = node.second.size(); 0 < i; )
      {
        if (node.second[--i] == it->second)
          node.second.erase(node.second.begin() + i);
      }
    }
    m_priv->loggers.erase(it);
    result = true;
  }
  return result;
}

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Created: 2025-07-01 06:08