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MetacriticService.cs
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MetacriticService.cs
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using System;
using System.Collections.Generic;
using System.Net;
using MetacriticScraper.Scraper;
using MetacriticScraper.Interfaces;
using MetacriticScraper.Errors;
using System.Threading;
using NLog;
namespace MetacriticAPI.Services
{
public class MetacriticService : IMetacriticService
{
private IScraper m_metacriticScraper;
private Dictionary<string, ResponseItem> m_activeRequest;
private object m_requestItemsLock;
private static Logger Logger = LogManager.GetCurrentClassLogger();
public MetacriticService(int limit)
{
m_metacriticScraper = new WebScraper(ResponseChannel, limit);
m_activeRequest = new Dictionary<string, ResponseItem>();
m_requestItemsLock = new object();
}
public IMetacriticData[] GetResult(string id, string url, string ip, out HttpStatusCode statusCode)
{
try
{
Logger.Info("Added request => IP: {0}, Url: {1}", ip, url);
m_metacriticScraper.AddItem(id, url);
}
catch(SystemBusyException ex)
{
Logger.Error("Exception encountered {0}", ex.ToString());
Error[] error = new Error[1];
Error err = new Error(ex);
error[0] = err;
statusCode = HttpStatusCode.ServiceUnavailable;
return error;
}
catch (InvalidUrlException ex)
{
Logger.Error("Exception encountered {0}", ex.ToString());
Error[] error = new Error[1];
Error err = new Error(ex);
error[0] = err;
statusCode = HttpStatusCode.NotFound;
return error;
}
ResponseItem item = new ResponseItem();
lock (m_requestItemsLock)
{
m_activeRequest.Add(id, item);
}
if (item.WaitEvent.WaitOne(30000))
{
statusCode = HttpStatusCode.OK;
}
else
{
statusCode = HttpStatusCode.ServiceUnavailable;
}
return item.Response;
}
public string GetId()
{
return Guid.NewGuid().ToString();
}
public void ResponseChannel(string id, IMetacriticData[] responses)
{
bool existing = false;
lock (m_requestItemsLock)
{
existing = m_activeRequest.ContainsKey(id);
}
if (existing)
{
lock (m_requestItemsLock)
{
m_activeRequest[id].Response = responses;
m_activeRequest[id].WaitEvent.Set();
m_activeRequest.Remove(id);
}
}
}
private class ResponseItem
{
private IMetacriticData[] m_response;
public IMetacriticData[] Response
{
get
{
return m_response;
}
set
{
m_response = value;
}
}
private AutoResetEvent m_waitEvent;
public AutoResetEvent WaitEvent
{
get
{
return m_waitEvent;
}
}
public ResponseItem()
{
m_waitEvent = new AutoResetEvent(false);
}
}
}
}