private Recorder(ILogger logger, ICrashReporter crasher, IAuditReporter auditor, IMetricReporter measurer)
{
logger.GuardAgainstNull(nameof(logger));
crasher.GuardAgainstNull(nameof(crasher));
auditor.GuardAgainstNull(nameof(auditor));
measurer.GuardAgainstNull(nameof(measurer));
this.logger = logger;
this.crasher = crasher;
this.auditor = auditor;
this.measurer = measurer;
}