File content as of revision 0:13d1767f0c98:

#include <stdarg.h>

namespace Log;

class LoggerInterface
{
    public:
    /**
     * System is unusable.
     *
     * @param string $message
     */
    void emergency(char* message, ...) = null;

    /**
     * Action must be taken immediately.
     *
     * Example: Entire website down, database unavailable, etc. This should
     * trigger the SMS alerts and wake you up.
     *
     * @param string $message
     */
    void alert(char* message, ...) = null;

    /**
     * Critical conditions.
     *
     * Example: Application component unavailable, unexpected exception.
     *
     * @param string $message
     */
    void critical(char* message, ...) = null;

    /**
     * Runtime errors that do not require immediate action but should typically
     * be logged and monitored.
     *
     * @param string $message
     */
    void error(char* message, ...) = null;

    /**
     * Exceptional occurrences that are not errors.
     *
     * Example: Use of deprecated APIs, poor use of an API, undesirable things
     * that are not necessarily wrong.
     *
     * @param string $message
     */
    void warning(char* message, ...) = null;

    /**
     * Normal but significant events.
     *
     * @param string $message
     */
    void notice(char* message, ...) = null;

    /**
     * Interesting events.
     *
     * Example: User logs in, SQL logs.
     *
     * @param string $message
     */
    void info(char* message, ...) = null;

    /**
     * Detailed debug information.
     *
     * @param string $message
     */
    void debug(char* message, ...) = null;

    /**
     * Logs with an arbitrary level.
     *
     * @param mixed $level
     * @param string $message
     */
    void log(Level level, char* message, ...) = null;
}