Start to use leveled log

pkg/obichunk/options.go

@@ -9,6 +9,7 @@ type __options__ struct {
 	bufferSize      int
 	batchSize       int
 	parallelWorkers int
+	noSingleton     bool
 }
 
 type Options struct {
@@ -27,6 +28,7 @@ func MakeOptions(setters []WithOption) Options {
 		bufferSize:      2,
 		batchSize:       5000,
 		parallelWorkers: 4,
+		noSingleton:     false,
 	}
 
 	opt := Options{&o}
@@ -79,6 +81,10 @@ func (opt Options) SortOnDisk() bool {
 	return opt.pointer.cacheOnDisk
 }
 
+func (opt Options) NoSingleton() bool {
+	return opt.pointer.noSingleton
+}
+
 func OptionSortOnDisk() WithOption {
 	f := WithOption(func(opt Options) {
 		opt.pointer.cacheOnDisk = true
@@ -149,3 +155,19 @@ func OptionsBufferSize(size int) WithOption {
 
 	return f
 }
+
+func OptionsNoSingleton() WithOption {
+	f := WithOption(func(opt Options) {
+		opt.pointer.noSingleton = true
+	})
+
+	return f
+}
+
+func OptionsWithSingleton() WithOption {
+	f := WithOption(func(opt Options) {
+		opt.pointer.noSingleton = false
+	})
+
+	return f
+}