/// <summary>
/// Can return 3 different values:
/// 1. "exists": No new jobs on the server.
/// 2. "incorrectCache": If the cache indicates that local database got data that the server doesnt have.
/// 3. "newData": There are new jobs available on the server.
/// 4. null: Check if Authenticater.Authorized has been set to false, if not the app could most likely not reach the server.
/// TODO Way to complicated logic, simplify this method if theres time
/// </summary>
/// <returns></returns>
private async Task <string> CheckServerForNewData(List <string> studyGroups = null, Dictionary <string, string> filter = null)
{
//"api/v1/jobs/lastmodifed"
string queryParams = CreateQueryParams(studyGroups, null, filter);
string adress = Adress + "/" + "lastmodified" + queryParams;
System.Diagnostics.Debug.WriteLine("JobController - CheckServerForNewData - adress: " + adress);
Uri url = new Uri(adress);
System.Diagnostics.Debug.WriteLine("JobController - CheckServerForNewData - url.ToString: " + url.ToString());
var client = new HttpClient();
DbStudent dbStudent = new DbStudent();
string accessToken = dbStudent.GetStudentAccessToken();
if (string.IsNullOrWhiteSpace(accessToken))
{
Authenticater.Authorized = false;
return(null);
}
System.Diagnostics.Debug.WriteLine("JobController - CheckServerForNewData - bearer: " + accessToken);
client.DefaultRequestHeaders.Authorization = new AuthenticationHeaderValue("bearer", accessToken);
string jsonString = null;
try
{
var response = await client.GetAsync(url);
System.Diagnostics.Debug.WriteLine("CheckServerForNewData response " + response.StatusCode.ToString());
if (response.StatusCode == HttpStatusCode.Unauthorized)
{
System.Diagnostics.Debug.WriteLine("JobsController - CheckServerForNewData failed due to lack of Authorization");
Authenticater.Authorized = false;
}
else if (response.StatusCode == HttpStatusCode.OK)
{
//results = await response.Content.ReadAsAsync<IEnumerable<Job>>();
jsonString = await response.Content.ReadAsStringAsync();
}
}
catch (Exception e)
{
System.Diagnostics.Debug.WriteLine("JobController - CheckServerForNewData: await client.GetAsync(\"url\") Failed");
System.Diagnostics.Debug.WriteLine("JobController - CheckServerForNewData: Exception msg: " + e.Message);
System.Diagnostics.Debug.WriteLine("JobController - CheckServerForNewData: Stack Trace: \n" + e.StackTrace);
System.Diagnostics.Debug.WriteLine("JobController - CheckServerForNewData: End Of Stack Trace");
return(null);
}
if (jsonString != null)
{
// using <string, object> instead of <string, string> makes the date be stored in the right format when using .ToString()
Dictionary <string, object> dict = JsonConvert.DeserializeObject <Dictionary <string, object> >(jsonString);
if (dict.ContainsKey("uuid") && dict.ContainsKey("modified") && dict.ContainsKey("hash") && dict.ContainsKey("amountOfJobs"))
{
string uuid = dict["uuid"].ToString();
DateTime dateTime = (DateTime)dict["modified"];
long modified = long.Parse(dateTime.ToString("yyyyMMddHHmmss"));
string uuids = dict["hash"].ToString();
int amountOfJobs = 0;
try
{
amountOfJobs = Int32.Parse(dict["amountOfJobs"].ToString());
}
catch (Exception ex)
{
System.Diagnostics.Debug.WriteLine("JobController - CheckServerForNewData: await client.GetAsync(\"url\") Failed");
System.Diagnostics.Debug.WriteLine("JobController - CheckServerForNewData: Exception msg: " + ex.Message);
System.Diagnostics.Debug.WriteLine("JobController - CheckServerForNewData: Stack Trace: \n" + ex.StackTrace);
System.Diagnostics.Debug.WriteLine("JobController - CheckServerForNewData: End Of Stack Trace");
return(null);
}
DbJob db = new DbJob();
bool existInDb = db.ExistsInDb(uuid, modified);
if (!existInDb)
{
return("newData");
//return existInDb;
}
var localJobs = db.GetJobsFromDbBasedOnFilter(studyGroups, filter, true);
int localDbCount = localJobs.Count();
StringBuilder sb = new StringBuilder();
foreach (var job in localJobs)
{
sb.Append(job.uuid);
}
string localUuids = Hasher.CalculateMd5Hash(sb.ToString());
// if there is a greater amount of jobs on that search filter then the job that exist
// in the database has been inserted throught another search filter
if (uuids != localUuids)
{
if (amountOfJobs > localDbCount)
{
return("newData");
//return !existInDb;
}
return("incorrectCache");
}
return("exists");
//return existInDb;
}
}
return(null);
}
/// <summary>
/// Peter ikke se på denne metoden, den er kun for å teste databasen :D
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private async void TestJobsFilterDb_OnClicked(object sender, EventArgs e)
{
List <string> studyGroups = new List <string>();
string helse = Hasher.Base64Encode("helse");
string datateknologi = Hasher.Base64Encode("datateknologi");
studyGroups.Add(helse);
studyGroups.Add(datateknologi);
Dictionary <string, string> filter = new Dictionary <string, string>();
string vestagder = Hasher.Base64Encode("vestagder");
string heltid = Hasher.Base64Encode("heltid");
filter.Add("locations", vestagder);
filter.Add("types", heltid);
DbJob jc = new DbJob();
var jobs = jc.GetJobsFromDbBasedOnFilter(null, filter);
if (jobs == null)
{
System.Diagnostics.Debug.WriteLine("TestJobsFilterDb: was null aka failed!");
}
else
{
System.Diagnostics.Debug.WriteLine("GetJobsBasedOnFilter: jobs.Count(): " +
jobs.Count());
foreach (var job in jobs)
{
System.Diagnostics.Debug.WriteLine("Jobs title: " + job.title);
if (job.companies != null)
{
System.Diagnostics.Debug.WriteLine("Companies is not null: " + job.companies[0].id);
}
}
}
var jobs2 = jc.GetJobsFromDbBasedOnFilter(studyGroups);
if (jobs2 == null)
{
System.Diagnostics.Debug.WriteLine("TestJobsFilterDb: was null aka failed!");
}
else
{
System.Diagnostics.Debug.WriteLine("GetJobsBasedOnFilter: jobs2.Count(): " +
jobs2.Count());
foreach (var job in jobs2)
{
System.Diagnostics.Debug.WriteLine("Jobs2 title: " + job.title);
if (job.companies != null)
{
System.Diagnostics.Debug.WriteLine("Companies is not null: " + job.companies[0].id);
System.Diagnostics.Debug.WriteLine("Companies is not null: " + job.companies[0].name);
System.Diagnostics.Debug.WriteLine("Companies is not null: " + job.companies[0].logo);
}
}
}
var jobs3 = jc.GetJobsFromDbBasedOnFilter(studyGroups, filter);
if (jobs3 == null)
{
System.Diagnostics.Debug.WriteLine("TestJobsFilterDb: was null aka failed!");
}
else
{
System.Diagnostics.Debug.WriteLine("GetJobsBasedOnFilter: jobs3.Count(): " +
jobs3.Count());
foreach (var job in jobs3)
{
System.Diagnostics.Debug.WriteLine("Jobs3 title: " + job.title);
if (job.companies != null)
{
System.Diagnostics.Debug.WriteLine("Companies is not null: " + job.companies[0].id);
}
}
}
Dictionary <string, string> filter2 = new Dictionary <string, string>();
//string internship = Hasher.Base64Encode("Internship");
filter2.Add("titles", "Internship");
var jobs4 = jc.GetJobsFromDbBasedOnFilter(studyGroups, filter2);
if (jobs4 == null)
{
System.Diagnostics.Debug.WriteLine("TestJobsFilterDb: was null aka failed!");
}
else
{
System.Diagnostics.Debug.WriteLine("GetJobsBasedOnFilter: jobs4.Count(): " +
jobs4.Count());
foreach (var job in jobs4)
{
System.Diagnostics.Debug.WriteLine("Jobs4 title: " + job.title);
if (job.companies != null)
{
System.Diagnostics.Debug.WriteLine("Companies is not null: " + job.companies[0].id);
}
}
}
/*
* StudyGroupsController sgc = new StudyGroupsController();
* sgc.UpdateStudyGroupsFromServer(); */
}
/// <summary>
/// Gets a job based on optional filters.
/// </summary>
/// <param name="studyGroups">studyGroups can be a list of numerous studygroups ex: helse, idrettsfag, datateknologi </param>
/// </param>
/// <param name="filter">A dictionary where key can be: titles (values:title of the job), types (values: deltid, heltid, etc...),
/// locations (values: vestagder, austagder), .
/// Supports only 1 key at this current implementation!</param>
/// <returns></returns>
public async Task <IEnumerable <Job> > GetJobsBasedOnFilter(List <string> studyGroups = null,
Dictionary <string, string> filter = null)
{
DbJob db = new DbJob();
//string adress = "http://kompetansetorgetserver1.azurewebsites.net/api/v1/jobs";
string instructions = await CheckServerForNewData(studyGroups, filter);
if (!Authenticater.Authorized)
{
return(null);
}
if (instructions != null)
{
System.Diagnostics.Debug.WriteLine("GetJobsBasedOnFilter - instructions: " + instructions);
if (instructions == "exists") // "newData"; incorrectCache exists
{
IEnumerable <Job> filteredJobs = db.GetJobsFromDbBasedOnFilter(studyGroups, filter);
filteredJobs = db.GetAllCompaniesRelatedToJobs(filteredJobs.ToList());
return(filteredJobs);
}
}
DbStudent dbStudent = new DbStudent();
string accessToken = dbStudent.GetStudentAccessToken();
if (string.IsNullOrWhiteSpace(accessToken))
{
Authenticater.Authorized = false;
return(null);
}
string sortBy = "publish";
string queryParams = CreateQueryParams(studyGroups, sortBy, filter);
Uri url = new Uri(Adress + queryParams);
System.Diagnostics.Debug.WriteLine("GetJobsBasedOnFilter - url: " + url.ToString());
var client = new HttpClient();
client.DefaultRequestHeaders.Authorization = new AuthenticationHeaderValue("bearer", accessToken);
string jsonString = null;
IEnumerable <Job> jobs = null;
try
{
var response = await client.GetAsync(url).ConfigureAwait(false);
System.Diagnostics.Debug.WriteLine("GetJobsBasedOnFilter response " + response.StatusCode.ToString());
if (response.StatusCode == HttpStatusCode.Unauthorized)
{
System.Diagnostics.Debug.WriteLine("StudentsController - UpdateStudyGroupStudent failed due to lack of Authorization");
Authenticater.Authorized = false;
}
else if (response.StatusCode == HttpStatusCode.OK)
{
jsonString = await response.Content.ReadAsStringAsync();
//DeleteJobs(GetJobsFromDbBasedOnFilter(studyGroups, filter));
if (instructions != null && instructions == "incorrectCache")
{
var cachedJobs = db.GetJobsFromDbBasedOnFilter(studyGroups, filter);
jobs = DeserializeMany(jsonString);
// Get all jobs from that local dataset that was not in the data set provided by the server
// These are manually deleted jobs and have to be cleared from cache.
// linear search is ok because of small data set
var manuallyDeletedJobs = cachedJobs.Where(j => !jobs.Any(cj2 => cj2.uuid == j.uuid));
db.DeleteObsoleteJobs(manuallyDeletedJobs.ToList());
}
else
{
jobs = DeserializeMany(jsonString);
}
}
else
{
System.Diagnostics.Debug.WriteLine("GetJobsBasedOnFilter - Using the local database");
jobs = db.GetJobsFromDbBasedOnFilter(studyGroups, filter);
jobs = db.GetAllCompaniesRelatedToJobs(jobs.ToList());
}
return(jobs);
}
catch (Exception e)
{
// Hack workaround if mobil data and wifi is turned off
try
{
jobs = db.GetJobsFromDbBasedOnFilter(studyGroups, filter);
jobs = db.GetAllCompaniesRelatedToJobs(jobs.ToList());
return(jobs);
}
catch (Exception ex)
{
System.Diagnostics.Debug.WriteLine("JobsController - GetJobsBasedOnFilter: await client.GetAsync(\"url\") Failed");
System.Diagnostics.Debug.WriteLine("JobsController - GetJobsBasedOnFilter: Exception msg: " + ex.Message);
System.Diagnostics.Debug.WriteLine("JobsController - GetJobsBasedOnFilter: Stack Trace: \n" + ex.StackTrace);
System.Diagnostics.Debug.WriteLine("JobsController - GetJobsBasedOnFilter: End Of Stack Trace");
System.Diagnostics.Debug.WriteLine("GetJobsBasedOnFilter - Using the local database");
return(null);
}
}
}
