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: collector.go
    path of file: ./repos/IOC-golang/extension/aop/trace/transport
    
    the code of the file until where you have to start completion: /*
 * Copyright (c) 2022, Alibaba Group;
 * Licensed 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 agree
    
func newCollector(appName string, interval int, out chan []*model.Trace) (*collector, error) {
	if err := initStorageFactory(); err != nil {
		return nil, err
	}
	newCreatedCollector := &collector{
		spanHandlers:   spanHandler,
		spanReader:     spanReader,
		stopCh:         make(chan struct{}),
		out:            out,
		appName:        appName,
		storageFactory: storageFactory,
	}
	go newCreatedCollector.runReadLoop(time.Second * time.Duration(interval))

	return newCreatedCollector, nil
}