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Apache Geode provides a database-like consistency model, reliable transaction processing and a shared-nothing architecture to maintain very low latency performance with high concurrency processing
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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.
 */
package org.apache.geode.internal.logging.log4j;

import java.util.List;
import java.util.Map;
import java.util.Set;

import org.apache.logging.log4j.Level;
import org.apache.logging.log4j.LogManager;
import org.apache.logging.log4j.core.Appender;
import org.apache.logging.log4j.core.LoggerContext;
import org.apache.logging.log4j.core.config.AppenderRef;
import org.apache.logging.log4j.core.config.Configuration;
import org.apache.logging.log4j.core.config.LoggerConfig;
import org.apache.logging.log4j.core.config.Property;
import org.apache.logging.log4j.core.filter.AbstractFilterable;

import org.apache.geode.internal.logging.LogService;

/**
 * Utility methods to programmatically alter the configuration of Log4J2. Used by LogService and
 * tests.
 */
public class Configurator {

  public static void shutdown() {
    final LoggerContext context =
        ((org.apache.logging.log4j.core.Logger) LogManager.getRootLogger()).getContext();
    context.stop();
    org.apache.logging.log4j.core.config.Configurator.shutdown(context);
  }

  public static void setLevel(String name, Level level) {
    LoggerContext context = (LoggerContext) LogManager.getContext(false);
    LoggerConfig logConfig = getLoggerConfig(name);

    logConfig.setLevel(level);
    context.updateLoggers();

    if (level.isLessSpecificThan(Level.DEBUG)) {
      LogService.configureFastLoggerDelegating();
    }
  }

  public static Level getLevel(String name) {
    LoggerConfig logConfig = getOrCreateLoggerConfig(name);
    return logConfig.getLevel();
  }

  public static LoggerConfig getOrCreateLoggerConfig(String name) {
    LoggerContext context = (LoggerContext) LogManager.getContext(false);
    Configuration config = context.getConfiguration();
    LoggerConfig logConfig = config.getLoggerConfig(name);
    boolean update = false;
    if (!logConfig.getName().equals(name)) {
      List appenderRefs = logConfig.getAppenderRefs();
      Map properties = logConfig.getProperties();
      Set props = properties == null ? null : properties.keySet();
      logConfig = LoggerConfig.createLogger(String.valueOf(logConfig.isAdditive()),
          logConfig.getLevel(), name, String.valueOf(logConfig.isIncludeLocation()),
          appenderRefs == null ? null : appenderRefs.toArray(new AppenderRef[appenderRefs.size()]),
          props == null ? null : props.toArray(new Property[props.size()]), config, null);
      config.addLogger(name, logConfig);
      update = true;
    }
    if (update) {
      context.updateLoggers();
    }
    return logConfig;
  }

  public static LoggerConfig getOrCreateLoggerConfig(String name, boolean additive,
      boolean forceAdditivity) {
    LoggerContext context = (LoggerContext) LogManager.getContext(false);
    Configuration config = context.getConfiguration();
    LoggerConfig logConfig = config.getLoggerConfig(name);
    boolean update = false;
    if (!logConfig.getName().equals(name)) {
      List appenderRefs = logConfig.getAppenderRefs();
      Map properties = logConfig.getProperties();
      Set props = properties == null ? null : properties.keySet();
      logConfig = LoggerConfig.createLogger(String.valueOf(additive), logConfig.getLevel(), name,
          String.valueOf(logConfig.isIncludeLocation()),
          appenderRefs == null ? null : appenderRefs.toArray(new AppenderRef[appenderRefs.size()]),
          props == null ? null : props.toArray(new Property[props.size()]), config, null);
      config.addLogger(name, logConfig);
      update = true;
    }
    if (forceAdditivity && logConfig.isAdditive() != additive) {
      logConfig.setAdditive(additive);
      update = true;
    }
    if (update) {
      context.updateLoggers();
    }
    return logConfig;
  }

  public static LoggerConfig getLoggerConfig(final String name) {
    LoggerContext context = (LoggerContext) LogManager.getContext(false);
    Configuration config = context.getConfiguration();
    LoggerConfig logConfig = config.getLoggerConfig(name);
    if (!logConfig.getName().equals(name)) {
      throw new IllegalStateException("LoggerConfig does not exist for " + name);
    }
    return logConfig;
  }

  public static boolean hasContextWideFilter(final Configuration config) {
    return config.hasFilter();
  }

  public static String getConfigurationSourceLocation(final Configuration config) {
    return config.getConfigurationSource().getLocation();
  }

  public static boolean hasAppenderFilter(final Configuration config) {
    for (Appender appender : config.getAppenders().values()) {
      if (appender instanceof AbstractFilterable) {
        if (((AbstractFilterable) appender).hasFilter()) {
          return true;
        }
      }
    }
    return false;
  }

  public static boolean hasDebugOrLower(final Configuration config) {
    for (LoggerConfig loggerConfig : config.getLoggers().values()) {
      boolean isDebugOrLower = loggerConfig.getLevel().isLessSpecificThan(Level.DEBUG);
      if (isDebugOrLower) {
        return true;
      }
    }
    return false;
  }

  public static boolean hasLoggerFilter(final Configuration config) {
    for (LoggerConfig loggerConfig : config.getLoggers().values()) {
      boolean isRoot = loggerConfig.getName().equals("");
      boolean isGemFire = loggerConfig.getName().startsWith(LogService.BASE_LOGGER_NAME);
      boolean hasFilter = loggerConfig.hasFilter();
      boolean isGemFireVerboseFilter =
          hasFilter && (LogService.GEODE_VERBOSE_FILTER.equals(loggerConfig.getFilter().toString())
              || LogService.GEMFIRE_VERBOSE_FILTER.equals(loggerConfig.getFilter().toString()));

      if (isRoot || isGemFire) {
        // check for Logger Filter
        if (hasFilter && !isGemFireVerboseFilter) {
          return true;
        }
      }
    }
    return false;
  }

  public static boolean hasAppenderRefFilter(final Configuration config) {
    for (LoggerConfig loggerConfig : config.getLoggers().values()) {
      boolean isRoot = loggerConfig.getName().equals("");
      boolean isGemFire = loggerConfig.getName().startsWith(LogService.BASE_LOGGER_NAME);

      if (isRoot || isGemFire) {
        // check for AppenderRef Filter
        for (AppenderRef appenderRef : loggerConfig.getAppenderRefs()) {
          if (appenderRef.getFilter() != null) {
            return true;
          }
        }
      }
    }
    return false;
  }
}