be/src/util/logging-support.h

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//
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#ifndef IMPALA_UTIL_LOGGING_SUPPORT_H
#define IMPALA_UTIL_LOGGING_SUPPORT_H

#include "gen-cpp/Logging_types.h"

namespace impala {

class Webserver;

/// Registers the required native logging functions with JNI. This allows the Java log4j
/// log messages to be forwarded to Glog. Also loads the JNI helper methods to dynamically
/// change these Java log levels.
void InitJvmLoggingSupport();

/// Helper function to convert a command line logging flag value (input as an int) to the
/// matching TLogLevel enum value.
TLogLevel::type FlagToTLogLevel(int flag);

/// Registers the call back methods for handling dynamic log level changes. Since every
/// daemon need not include an embedded jvm, dynamic log4j configuration is supported only
/// when register_log4j_handlers is true.
void RegisterLogLevelCallbacks(Webserver* webserver, bool register_log4j_handlers);

class LoggingSupport {
 public:
  /// Helper function for log rotation that deletes all files matching the path pattern
  /// except for the max_log_files newest. If max_log_files is <= 0, no files will
  /// be deleted.
  static void DeleteOldLogs(const std::string& path_pattern, int max_log_files);
};

}
#endif