public static IDictionary <string, uint> GetTopWordsSequential(FileInfo InputFile, char[] Separators, uint TopCount)
{
// Initialize Result Dictionary
var result = new Dictionary <string, uint>(StringComparer.InvariantCultureIgnoreCase);
// Loop through lines in file
foreach (var line in File.ReadLines(InputFile.FullName))
{
// Loop through words in lines
foreach (var word in line.Split(Separators, StringSplitOptions.RemoveEmptyEntries))
{
// Check word in blacklist
if (!TrackWordsClass.IsValidWord(word))
{
continue;
}
// Track word
TrackWordsClass.TrackWordsOccurrence(result, word);
}
}
// Return ordered dictionary
return(result
.OrderByDescending(kv => kv.Value)
.Take((int)TopCount)
.ToDictionary(kv => kv.Key, kv => kv.Value));
}
public static IDictionary <string, uint> GetTopWordsParallelForEachMapReduce(FileInfo InputFile, char[] Separators, uint TopCount)
{
// Initalize result dictionary
var result = new Dictionary <string, uint>(StringComparer.InvariantCultureIgnoreCase);
// Loop through lines in parallel
Parallel.ForEach(
File.ReadLines(InputFile.FullName),
new ParallelOptions {
MaxDegreeOfParallelism = Environment.ProcessorCount
},
() => new Dictionary <string, uint>(StringComparer.InvariantCultureIgnoreCase),
(line, state, index, localDic) =>
{
// Loop through words, filter seperators
foreach (var word in line.Split(Separators, StringSplitOptions.RemoveEmptyEntries))
{
// Valid word
if (!TrackWordsClass.IsValidWord(word))
{
continue;
}
// Update word list
TrackWordsClass.TrackWordsOccurrence(localDic, word);
}
return(localDic);
},
localDic =>
{
lock (result)
{
// Organize pairs
foreach (var pair in localDic)
{
var key = pair.Key;
// Increment matching keys
if (result.ContainsKey(key))
{
result[key] += pair.Value;
}
else
{
result[key] = pair.Value;
}
}
}
}
);
// Return ordered dictionary
return(result
.OrderByDescending(kv => kv.Value)
.Take((int)TopCount)
.ToDictionary(kv => kv.Key, kv => kv.Value));
}
public static IDictionary <string, uint> GetTopWordsPLINQMapReduce(FileInfo InputFile, char[] Separators, uint TopCount)
{
// Return ordered dictionary
return(File.ReadLines(InputFile.FullName)
.AsParallel()
// Let C# decide max degree
//.WithDegreeOfParallelism(12)
.Aggregate(
() => new Dictionary <string, uint>(StringComparer.InvariantCultureIgnoreCase), //#1
(localDic, line) => //#2
{
// Ignore seperator characters
foreach (var word in line.Split(Separators, StringSplitOptions.RemoveEmptyEntries))
{
// Check word is blacklist
if (!TrackWordsClass.IsValidWord(word))
{
continue;
}
// Track word
TrackWordsClass.TrackWordsOccurrence(localDic, word);
}
return localDic;
},
// Take result and sort by key/value pair
(finalResult, localDic) => //#3
{
foreach (var pair in localDic)
{
var key = pair.Key;
if (finalResult.ContainsKey(key))
{
finalResult[key] += pair.Value;
}
else
{
finalResult[key] = pair.Value;
}
}
return finalResult;
},
// Return ordered dictionary
finalResult => finalResult //#4
.OrderByDescending(kv => kv.Value)
.Take((int)TopCount)
.ToDictionary(kv => kv.Key, kv => kv.Value)
));
}
public static IDictionary <string, uint> GetTopWordsPLINQNaive(FileInfo InputFile, char[] Separators, uint TopCount)
{
// Initalize words array by reading from file in paralll
var words = File.ReadLines(InputFile.FullName)
.AsParallel()
.SelectMany(l => l.Split(Separators, StringSplitOptions.RemoveEmptyEntries))
.Where(TrackWordsClass.IsValidWord);
// Initialize results dictionary
var result = new Dictionary <string, uint>(StringComparer.InvariantCultureIgnoreCase);
foreach (var word in words)
{
// Track word
TrackWordsClass.TrackWordsOccurrence(result, word);
}
// Return ordered dictionary
return(result
.OrderByDescending(kv => kv.Value)
.Take((int)TopCount)
.ToDictionary(kv => kv.Key, kv => kv.Value));
}
