Feature: Allow multi-threading in sub tasks #137

src/main/java/drawingbot/plotting/PFMTask.java

@@ -42,6 +42,7 @@ public class PFMTask extends DBTask<PlottedDrawing> implements ISpecialListenabl
     public boolean finishEarly = false;
     public PlottingTools tools;
     public boolean isSubTask = false;
+    public boolean allowSubTaskMultiThreading = false;
 
     // RENDERING \\\
     public boolean skipReRender = false;
@@ -427,6 +428,14 @@ public boolean isSubTask() {
         return isSubTask;
     }
 
+    public boolean allowSubTaskMultiThreading(){
+        return allowSubTaskMultiThreading;
+    }
+
+    public boolean canUseMultiThreading(){
+        return !isSubTask() || allowSubTaskMultiThreading();
+    }
+
     //// RENDERING \\\\
 
     private WrappedGeometryIterator iterator;

src/main/java/drawingbot/plotting/PFMTaskBuilder.java

@@ -41,6 +41,7 @@ public class PFMTaskBuilder {
 
     /** If the tasks lifecycle is controlled by another task */
     public boolean isSubTask;
+    public boolean allowSubTaskMultiThreading;
 
     /** Set to true if you wish to bypass any external custom task suppliers / setup, e.g. if using a PFM inside another PFM and not in an external task this should be set to true */
     public boolean useInternalBuilder;
@@ -111,6 +112,7 @@ public PFMTask createPFMTask(){
         }
 
         task.isSubTask = isSubTask;
+        task.allowSubTaskMultiThreading = allowSubTaskMultiThreading;
 
         if(postSetup != null){
             postSetup.accept(task);
@@ -173,6 +175,11 @@ public PFMTaskBuilder setSubTask(boolean isSubTask) {
         return this;
     }
 
+    public PFMTaskBuilder setAllowSubTaskMultiThreading(boolean allowSubTaskMultiThreading) {
+        this.allowSubTaskMultiThreading = allowSubTaskMultiThreading;
+        return this;
+    }
+
     public PFMTaskBuilder setUseInternalBuilder(boolean useInternalBuilder) {
         this.useInternalBuilder = useInternalBuilder;
         return this;