diff --git a/libraries/fileprocessing/src/main/kotlin/de/itkl/fileprocessing/ProcessingPipeline.kt b/libraries/fileprocessing/src/main/kotlin/de/itkl/fileprocessing/ProcessingPipeline.kt
index ad8fe2a..36039a6 100644
--- a/libraries/fileprocessing/src/main/kotlin/de/itkl/fileprocessing/ProcessingPipeline.kt
+++ b/libraries/fileprocessing/src/main/kotlin/de/itkl/fileprocessing/ProcessingPipeline.kt
@@ -21,6 +21,7 @@ abstract class FileProcessingPipeline {
                 val resource = FileResource(currentFile)
                 val progress = ProgressResource(resource, progressBarFactory)
                 processor.process(progress)
+                Log.info { "File created: $target" } 
             }
             currentFile = target.toFile()
         }
diff --git a/libraries/fileprocessing/src/main/kotlin/de/itkl/processing/ParallelFlowProcessor.kt b/libraries/fileprocessing/src/main/kotlin/de/itkl/processing/ParallelFlowProcessor.kt
index 284304c..d63e02a 100644
--- a/libraries/fileprocessing/src/main/kotlin/de/itkl/processing/ParallelFlowProcessor.kt
+++ b/libraries/fileprocessing/src/main/kotlin/de/itkl/processing/ParallelFlowProcessor.kt
@@ -19,17 +19,19 @@ class ParallelFlowProcessor<T,U>(
     }
 
     suspend fun process(flow: Flow<T>): Flow<U> {
-        return flow {
-            flow.map { kotlinx.coroutines.Runnable {
-                val result = mapperFn(it)
-                runBlocking { emit(result) }
-            } }
-                .map { job -> workers.submit(job)}
-                .toList()
-                .forEach { future -> emit(future.get() as U) }
-            withContext(Dispatchers.IO) {
-                workers.awaitTermination(10000, TimeUnit.DAYS)
-            }
-        }
+        TODO()
+//        flow.map {  }
+//        return flow {
+//            flow.map { kotlinx.coroutines.Runnable {
+//                val result = mapperFn(it)
+//                runBlocking { emit(result) }
+//            } }
+//                .map { job -> workers.submit(job)}
+//                .toList()
+//                .forEach { future -> emit(future.get() as U) }
+//            withContext(Dispatchers.IO) {
+//                workers.awaitTermination(10000, TimeUnit.DAYS)
+//            }
+//        }
     }
 }
\ No newline at end of file
diff --git a/libraries/textprocessing/src/main/kotlin/de/itkl/textprocessing/Histogram.kt b/libraries/textprocessing/src/main/kotlin/de/itkl/textprocessing/Histogram.kt
index 87ee5de..3ba3689 100644
--- a/libraries/textprocessing/src/main/kotlin/de/itkl/textprocessing/Histogram.kt
+++ b/libraries/textprocessing/src/main/kotlin/de/itkl/textprocessing/Histogram.kt
@@ -13,8 +13,7 @@ class Histogram(private val histo: MutableMap<String,UInt> = mutableMapOf()) : I
 
         suspend fun fromBagOfWords(flow: Flow<BagOfWords>): Histogram {
             val result = Histogram()
-            flow.collectIndexed { index, value ->
-                println(index)
+            flow.collect() { value ->
                 value.forEach(result::add)
             }
             return result
diff --git a/libraries/tfidf/src/main/kotlin/de/itkl/tfidf/Idf.kt b/libraries/tfidf/src/main/kotlin/de/itkl/tfidf/Idf.kt
index 82b4b8b..e740237 100644
--- a/libraries/tfidf/src/main/kotlin/de/itkl/tfidf/Idf.kt
+++ b/libraries/tfidf/src/main/kotlin/de/itkl/tfidf/Idf.kt
@@ -5,42 +5,71 @@ import de.itkl.fileprocessing.FileProcessor
 import de.itkl.fileprocessing.Resource
 import de.itkl.processing.ParallelFlowProcessor
 import de.itkl.textprocessing.*
+import de.itkl.tfidf.Idf.Companion.count
 import io.github.oshai.kotlinlogging.KotlinLogging
-import kotlinx.coroutines.flow.map
-import kotlinx.coroutines.flow.reduce
-import kotlinx.coroutines.flow.take
+import kotlinx.coroutines.*
+import kotlinx.coroutines.channels.Channel
+import kotlinx.coroutines.channels.consumeEach
+import kotlinx.coroutines.flow.*
+import kotlinx.coroutines.sync.Semaphore
+import kotlinx.coroutines.sync.withPermit
 import java.io.File
 import java.nio.file.Path
+import java.util.concurrent.atomic.AtomicInteger
 import kotlin.io.path.nameWithoutExtension
 
 private val Log = KotlinLogging.logger { }
 
 class Idf : FileProcessor {
+
+    companion object {
+        val count = AtomicInteger(0)
+    }
+
     override fun willProduce(path: Path): Path {
         return path.parent.resolve(path.nameWithoutExtension + "-idf.csv")
     }
 
-    override suspend fun process(resource: Resource): File {
+    override suspend fun process(resource: Resource): File = coroutineScope {
         Log.info { "Would produce: ${willProduce(resource.path)}" }
         val resultFile = willProduce(resource.path).toFile()
-        val textFile = TextFile(resource.read())
-        val documents = textFile.splitByEmptyLines()
-        val bagOfWords = ParallelFlowProcessor<List<String>, BagOfWords>(
-            mapperFn = { document ->
-                val tokenizer = Tokenizer()
-                val bagOfWords = document.map { line ->
-                    val tokens = tokenizer.tokenize(line)
-                    BagOfWords.from(tokens)
-                }
-                    .reduce { acc, bagOfWords ->  acc.join(bagOfWords) }
-                bagOfWords
-            }
-        ).process(documents)
+        val channel = Channel<List<String>>(0)
 
+        launch {
+            TextFile(resource.read())
+                .splitByEmptyLines()
+                .collect {
+                    channel.send(it)
+                }
+        }
+
+        val bagOfWords = channelFlow {
+            (0..16).map {
+                launch(Dispatchers.Default) {
+                    channel.consumeEach {
+                        val value = collectWordsOfDocument(it)
+                        send(value)
+                    }
+                }
+            }
+        }
 
         val histogram = Histogram.fromBagOfWords(bagOfWords)
         HistogramCsvStorage().save(histogram, resultFile)
-        return resultFile
+        resultFile
+    }
+
+    private fun collectWordsOfDocument(document: List<String>): BagOfWords {
+        if (document.isEmpty()) {
+            return BagOfWords()
+        }
+        val tokenizer = Tokenizer()
+        val bagOfWords = document.map { line ->
+            val tokens = tokenizer.tokenize(line)
+            BagOfWords.from(tokens)
+        }
+            .reduce { acc, bagOfWords ->  acc.join(bagOfWords) }
+        return bagOfWords
     }
 
 }
\ No newline at end of file