fix gitignore

.gitignore

@@ -1,4 +1,4 @@
 .gradle
 build
 .idea
-assets
+/assets

libraries/core-api/src/main/kotlin/de/itkl/core_api/interfaces/assets/Assets.kt

@@ -0,0 +1,15 @@
+package de.itkl.core_api.interfaces.assets
+
+import de.itkl.core_api.interfaces.Resource
+import kotlinx.coroutines.flow.Flow
+import java.util.function.Consumer
+
+interface Assets : Flow<Resource> {
+    suspend fun store(resource: Resource)
+    suspend fun retrieve(name: String): Resource?
+    suspend fun delete(name: String)
+
+    suspend fun exists(name: String): Boolean {
+        return retrieve(name) != null
+    }
+}

libraries/core-api/src/main/kotlin/de/itkl/core_api/interfaces/assets/FileProcessorBackend.kt

@@ -0,0 +1,16 @@
+package de.itkl.core_api.interfaces.assets
+
+import de.itkl.core_api.interfaces.FileProcessor
+import de.itkl.core_api.interfaces.FileProcessor2
+import de.itkl.core_api.interfaces.Resource
+
+/**
+ * Executes a [FileProcessor2] on a [Resource]. It decides if and when
+ * the [FileProcessor2.process] should be called and what should happen with the result
+ */
+interface FileProcessorBackend {
+    suspend fun process(
+        resource: Resource,
+        assets: Assets,
+        fileProcessor: FileProcessor2)
+}