You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: appStats.go
    path of file: ./repos/cockroach/pkg/sql/sqlstats/persistedsqlstats
    
    the code of the file until where you have to start completion: // Copyright 2021 The Cockroach Authors.
//
// Use of this software is governed by the Business Source License
// included in the file licenses/BSL.txt.
//
// As of the Change Date specified in that file, in accordance with
// the Business Source License, use of this software will be governed
// by the Apache License, Version 2.0, included in the file
// licenses/APL.txt.

package persistedsqlstats

import (
	"context"

	"github.com/cockroachdb/cockroach/pkg/sql/appstatspb"
	"github.com/cockroachdb/cockroach/pkg/sql/sqlstats"
	"github.com/cockroachdb/cockroach/pkg/sql/sqlstats/ssmemstorage"
	"github.com/cockroachdb/errors"
)

// ApplicationStats is a sqlstats.ApplicationStats that wraps an in-memory
// node-local ApplicationStats. ApplicationStats signals the subsystem when it
// encounters memory pres
    
func (s *ApplicationStats) recordStatsOrSendMemoryPressureSignal(fn func() error) error {
	err := fn()
	if errors.Is(err, ssmemstorage.ErrFingerprintLimitReached) || errors.Is(err, ssmemstorage.ErrMemoryPressure) {
		select {
		case s.memoryPressureSignal <- struct{}{}:
			// If we successfully signaled that we are experiencing memory pressure,
			// then our job is done. However, if we fail to send the signal, that
			// means we are already experiencing memory pressure and the
			// stats-flush-worker has already started to handle the flushing. We
			// don't need to do anything here at this point. The default case of the
			// select allows this operation to be non-blocking.
		default:
		}
		// We have already handled the memory pressure error. We don't have to
		// bubble up the error any further.
		return nil
	}
	return err
}