The business to be performed is to download nearly 40,000 pieces of audio from Alibaba Cloud to the local area, and a single download is very slow, so I want to use multi-threading, and allocate 20 threads to download at the same time, saving a lot of time
class Program
{
static void Main(string[] args) {
string sql = "select en_audio,us_audio from t_audio LIMIT 198 ";
MySqlDataReader mySqlDataReader = DBHelper.ExecuteReader(sql);
List<String> sList = new List<String>();
sList.Add("https://qutifen-qudao.oss-cn-beijing.aliyuncs.com/mfg/audio/v3/1abacus_en.ogg");
sList.Add("https://qutifen-qudao.oss-cn-beijing.aliyuncs.com/mfg/audio/v3/2abacus_en.ogg");
if (mySqlDataReader.HasRows)
{
while (mySqlDataReader.Read())
{
sList.Add(mySqlDataReader.GetString(0));
sList.Add(mySqlDataReader.GetString(1));
}
}
Console.WriteLine(sList.Count);
Stopwatch stopwatch = new Stopwatch();
stopwatch. Start();
ThreadStart(sList);
WaitHandle.WaitAll(waits); All threads in the listen wait have been set before executing the following code, otherwise they will be waiting here
stopwatch. Stop();
Console.WriteLine($"Time-consuming{stopwatch. ElapsedMilliseconds}milliseconds");
Console.ReadKey();
}
static Thread[] threads = new Thread[20];
static WaitHandle[] waits = new WaitHandle[20];
public static void ThreadStart(List<String> nums) {
Assign threads
for (int i=0; i<20; i++) {
threads[i] = new Thread(DownLoadFile);
waits[i] = new AutoResetEvent(false);
}
Assign data to each thread to execute and start execution
for (int i = 0; i < 20; i++)
{
if (i== threads. Length-1) {
var retult = nums. Skip(nums. Count / 20 * i). Take(nums. Count- nums. Count / 20*i). ToList();
threads[i]. Start(new Objpt()
{
sList = retult,
WaitHandle = waits[i],
ThreadIndex = i
});
}
else {
var retult= nums. Skip(nums. Count / 20 * i). Take(nums. Count / 20). ToList();
threads[i]. Start(new Objpt() {
sList= retult,
WaitHandle=waits[i],
ThreadIndex=i
});
}
}
}
public static void DownLoadFile(Object obj)
{
int count = 0;
Objpt optObj = (obj as Objpt);
var sList = optObj.sList;
Console.WriteLine($"Thread{optObj.ThreadIndex} started";
foreach (var url in sList)
{
try
{
count++;
var arrs = url. Split('/');
WebRequest request = WebRequest.Create(url);
HttpWebResponse res = (HttpWebResponse)request. GetResponse();
WebResponse response = request. GetResponse();
if (res. StatusCode.ToString() == "OK")
{
Stream responseStream = response. GetResponseStream();
using (FileStream fsWrite = new FileStream($"F:/Audio/v4/{arrs[arrs. Length - 2]}/{arrs[arrs. Length - 1]}", FileMode.OpenOrCreate, FileAccess.Write))
{
byte[] buffer = new byte[response. ContentLength];
while (true)
{
Returns the number of bytes actually read this time
int r = responseStream.Read(buffer, 0, buffer. Length);
if (r == 0)
{
break;
}
fsWrite.Write(buffer, 0, r); write
}
}
}
//if (count % 20 == 0 || count == sList.Count)
//{
Console.WriteLine($"Thread{optObj.ThreadIndex} processed:{count}");
//}
}
catch (Exception ex)
{
string strErrorLogFile = System.AppDomain.CurrentDomain.BaseDirectory + $"\\{optObj.ThreadIndex}ErrorLog.log";
if (! System.IO.File.Exists(strErrorLogFile))
System.IO.File.WriteAllText(strErrorLogFile, "//System ErrorLog File\r\n");
object objSql = "thread" + optObj.ThreadIndex.ToString() + ex. Message;
System.IO.File.AppendAllText(strErrorLogFile, DateTime.Now.ToString("yyyy-MM-dd HH:mm:ss") + "\t" + objSql.ToString() + url + "\r\n");
}
}
Console.WriteLine($"Thread{optObj.ThreadIndex} ends");
(optObj.WaitHandle as AutoResetEvent). Set(); set method is to mark when a thread ends
}
}
public class Objpt {
public List<String> sList { get; set; }
public WaitHandle WaitHandle { get; set; }
public int ThreadIndex { get; set; }
}
|
Posted on 12/11/2019 12:08:45 PM
|
|
|
