internal SnippetHighlighter(IHubContext hubContext, HighlighterDbContext dbContext)
{
if (hubContext == null)
{
throw new ArgumentNullException("hubContext");
}
if (dbContext == null)
{
throw new ArgumentNullException("dbContext");
}
_hubContext = hubContext;
_dbContext = dbContext;
}
public static void HighlightSnippet(int snippetId)
{
using (var context = new HighlighterDbContext())
{
var snippet = context.Snippets.Find(snippetId);
snippet.HighlightedSource = HighlightSource(snippet.Source);
snippet.HighlightedAt = DateTime.UtcNow;
context.SaveChanges();
var hubContext = GlobalHost.ConnectionManager.GetHubContext <SnippetHub>();
hubContext.Clients.Group(SnippetHub.GetGroup(snippet.Id))
.highlight(snippet.Id, snippet.HighlightedSource);
}
}
// Process a job
public static void HighlightSnippet(int snippetId)
{
using (var db = new HighlighterDbContext())
{
var snippet = db.CodeSnippets.Find(snippetId);
if (snippet == null)
{
return;
}
snippet.HighlightedCode = HighlightSource(snippet.SourceCode);
snippet.HighlightedAt = DateTime.UtcNow;
db.SaveChanges();
}
}
public async Task Subscribe(int snippetId)
{
await Groups.Add(Context.ConnectionId, GetGroup(snippetId));
// When a user subscribes a snippet that was already
// highlighted, we need to send it immediately, because
// otherwise she will listen for it infinitely.
using (var db = new HighlighterDbContext())
{
var snippet = await db.CodeSnippets
.Where(x => x.Id == snippetId && x.HighlightedCode != null)
.SingleOrDefaultAsync();
if (snippet != null)
{
Clients.Client(Context.ConnectionId)
.highlight(snippet.Id, snippet.HighlightedCode);
}
}
}
public async Task Subscribe(List <string> snippets)
{
var snippetIds = snippets.Select(int.Parse).ToArray();
var groups = snippetIds.Select(GetGroup).ToArray();
foreach (var @group in groups)
{
await Groups.Add(Context.ConnectionId, group);
}
using (var db = new HighlighterDbContext())
{
var highlighted = await db.Snippets
.Where(x => snippetIds.Contains(x.Id) && x.HighlightedSource != null)
.ToListAsync();
foreach (var snippet in highlighted)
{
Clients.Client(Context.ConnectionId)
.highlight(snippet.Id, snippet.HighlightedSource);
}
}
}
