added bounded tree to track exploration boundary

weed/util/bounded_tree/bounded_tree_test.go

@@ -0,0 +1,113 @@
+package bounded_tree
+
+import (
+	"fmt"
+	"testing"
+
+	"github.com/chrislusf/seaweedfs/weed/util"
+)
+
+
+var (
+
+	visitFn = func(path util.FullPath) (childDirectories []string, err error) {
+		fmt.Printf("  visit %v ...\n", path)
+		switch path {
+		case "/":
+			return []string{"a", "g", "h"}, nil
+		case "/a":
+			return []string{"b", "f"}, nil
+		case "/a/b":
+			return []string{"c", "e"}, nil
+		case "/a/b/c":
+			return []string{"d"}, nil
+		case "/a/b/c/d":
+			return []string{"i", "j"}, nil
+		case "/a/b/c/d/i":
+			return []string{}, nil
+		case "/a/b/c/d/j":
+			return []string{}, nil
+		case "/a/b/e":
+			return []string{}, nil
+		case "/a/f":
+			return []string{}, nil
+		}
+		return nil, nil
+	}
+
+
+	printMap = func(m map[string]*Node) {
+		for k := range m {
+			println("  >", k)
+		}
+	}
+
+
+)
+
+func TestBoundedTree(t *testing.T) {
+
+	// a/b/c/d/i
+	// a/b/c/d/j
+	// a/b/c/d
+	// a/b/e
+	// a/f
+	// g
+	// h
+
+	tree := NewBoundedTree()
+
+	tree.EnsureVisited(util.FullPath("/a/b/c"), visitFn)
+
+	printMap(tree.root.Children)
+
+	a := tree.root.getChild("a")
+
+	b := a.getChild("b")
+	if !b.isVisited() {
+		t.Errorf("expect visited /a/b")
+	}
+	c := b.getChild("c")
+	if !c.isVisited() {
+		t.Errorf("expect visited /a/b/c")
+	}
+
+	d := c.getChild("d")
+	if d.isVisited() {
+		t.Errorf("expect unvisited /a/b/c/d")
+	}
+
+	tree.EnsureVisited(util.FullPath("/a/b/c/d"), visitFn)
+	tree.EnsureVisited(util.FullPath("/a/b/c/d/i"), visitFn)
+	tree.EnsureVisited(util.FullPath("/a/b/c/d/j"), visitFn)
+	tree.EnsureVisited(util.FullPath("/a/b/e"), visitFn)
+	tree.EnsureVisited(util.FullPath("/a/f"), visitFn)
+
+	printMap(tree.root.Children)
+
+}
+
+func TestEmptyBoundedTree(t *testing.T) {
+
+	// g
+	// h
+
+	tree := NewBoundedTree()
+
+	visitFn := func(path util.FullPath) (childDirectories []string, err error) {
+		fmt.Printf("  visit %v ...\n", path)
+		switch path {
+		case "/":
+			return []string{"g", "h"}, nil
+		}
+		t.Fatalf("expected visit %s", path)
+		return nil, nil
+	}
+
+	tree.EnsureVisited(util.FullPath("/a/b"), visitFn)
+
+	tree.EnsureVisited(util.FullPath("/a/b"), visitFn)
+
+	printMap(tree.root.Children)
+
+}