public List <string> FindMatchesInPosts(string searchText, Action <SearchResult <string> > emitResult,
CancellationToken cancellationToken)
{
var fileStream = new FileStream(_BulkDataFiles.PostsPath, FileMode.Open, FileAccess.Read);
var watcher = new StreamWatcher(fileStream);
var reader = XmlReader.Create(watcher);
var resultList = new List <string>();
var recordsSearchedCount = 0;
while (reader.ReadToFollowing("row"))
{
if (cancellationToken.IsCancellationRequested)
{
var result = new SearchResult <string>();
result.RecordsSearchedCount = recordsSearchedCount;
result.UpdateStatus = SearchUpdateStatusEnum.Cancelled;
emitResult(result);
return(resultList);
}
if (fileStream.Position < 32000)
{
continue;
}
var rowAttributes = new Dictionary <string, string>();
while (reader.MoveToNextAttribute())
{
rowAttributes.Add(reader.Name, reader.Value);
}
recordsSearchedCount++;
if (rowAttributes.ContainsKey("Body") && rowAttributes["Body"].Contains(searchText))
{
resultList.Add(rowAttributes["Body"]);
var result = new SearchResult <string>();
result.RecordsSearchedCount = recordsSearchedCount;
result.Result = rowAttributes["Body"];
result.UpdateStatus = SearchUpdateStatusEnum.FoundResult;
emitResult(result);
}
if (recordsSearchedCount % _searchUpdateInterval == 0)
{
var result = new SearchResult <string>();
result.RecordsSearchedCount = recordsSearchedCount;
result.UpdateStatus = SearchUpdateStatusEnum.Searching;
emitResult(result);
}
}
var completeResult = new SearchResult <string>();
completeResult.RecordsSearchedCount = recordsSearchedCount;
completeResult.UpdateStatus = SearchUpdateStatusEnum.Complete;
emitResult(completeResult);
return(resultList);
}
public Dictionary <string, string> GetPostByID(int id, int startPosition, int maxAttempts)
{
var fileStream = new FileStream(_BulkDataFiles.PostsPath, FileMode.Open, FileAccess.Read);
var watcher = new StreamWatcher(fileStream);
var byteStartPosition = (long)8192 * startPosition;
fileStream.Position = byteStartPosition;
var reader = XmlReader.Create(watcher, new XmlReaderSettings()
{
ValidationType = ValidationType.None,
ConformanceLevel = ConformanceLevel.Fragment
});
var attemptCount = 0;
while (reader.ReadToFollowing("row"))
{
var rowAttributes = new Dictionary <string, string>();
while (reader.MoveToNextAttribute())
{
rowAttributes.Add(reader.Name, reader.Value);
}
if (rowAttributes.ContainsKey("Id") && rowAttributes["Id"] == id.ToString())
{
var position = fileStream.Position / 8192;
return(rowAttributes);
}
else
{
attemptCount++;
if (attemptCount >= maxAttempts)
{
return(null);
}
}
}
return(null);
}
