testing compilation with remove package

go/topology/node.go

@@ -0,0 +1,200 @@
+package topology
+
+import (
+	"fmt"
+	"code.google.com/p/weed-fs/go/storage"
+)
+
+type NodeId string
+type Node interface {
+	Id() NodeId
+	String() string
+	FreeSpace() int
+	ReserveOneVolume(r int, vid storage.VolumeId) (bool, *DataNode)
+	UpAdjustMaxVolumeCountDelta(maxVolumeCountDelta int)
+	UpAdjustVolumeCountDelta(volumeCountDelta int)
+	UpAdjustActiveVolumeCountDelta(activeVolumeCountDelta int)
+	UpAdjustMaxVolumeId(vid storage.VolumeId)
+
+	GetVolumeCount() int
+	GetActiveVolumeCount() int
+	GetMaxVolumeCount() int
+	GetMaxVolumeId() storage.VolumeId
+	SetParent(Node)
+	LinkChildNode(node Node)
+	UnlinkChildNode(nodeId NodeId)
+	CollectDeadNodeAndFullVolumes(freshThreshHold int64, volumeSizeLimit uint64)
+
+	IsDataNode() bool
+	Children() map[NodeId]Node
+	Parent() Node
+
+	GetValue() interface{} //get reference to the topology,dc,rack,datanode
+}
+type NodeImpl struct {
+	id                NodeId
+	volumeCount       int
+	activeVolumeCount int
+	maxVolumeCount    int
+	parent            Node
+	children          map[NodeId]Node
+	maxVolumeId       storage.VolumeId
+
+	//for rack, data center, topology
+	nodeType string
+	value    interface{}
+}
+
+func (n *NodeImpl) IsDataNode() bool {
+	return n.nodeType == "DataNode"
+}
+func (n *NodeImpl) IsRack() bool {
+	return n.nodeType == "Rack"
+}
+func (n *NodeImpl) IsDataCenter() bool {
+	return n.nodeType == "DataCenter"
+}
+func (n *NodeImpl) String() string {
+	if n.parent != nil {
+		return n.parent.String() + ":" + string(n.id)
+	}
+	return string(n.id)
+}
+func (n *NodeImpl) Id() NodeId {
+	return n.id
+}
+func (n *NodeImpl) FreeSpace() int {
+	return n.maxVolumeCount - n.volumeCount
+}
+func (n *NodeImpl) SetParent(node Node) {
+	n.parent = node
+}
+func (n *NodeImpl) Children() map[NodeId]Node {
+	return n.children
+}
+func (n *NodeImpl) Parent() Node {
+	return n.parent
+}
+func (n *NodeImpl) GetValue() interface{} {
+	return n.value
+}
+func (n *NodeImpl) ReserveOneVolume(r int, vid storage.VolumeId) (bool, *DataNode) {
+	ret := false
+	var assignedNode *DataNode
+	for _, node := range n.children {
+		freeSpace := node.FreeSpace()
+		//fmt.Println("r =", r, ", node =", node, ", freeSpace =", freeSpace)
+		if freeSpace <= 0 {
+			continue
+		}
+		if r >= freeSpace {
+			r -= freeSpace
+		} else {
+			if node.IsDataNode() && node.FreeSpace() > 0 {
+				//fmt.Println("vid =", vid, " assigned to node =", node, ", freeSpace =", node.FreeSpace())
+				return true, node.(*DataNode)
+			}
+			ret, assignedNode = node.ReserveOneVolume(r, vid)
+			if ret {
+				break
+			}
+		}
+	}
+	return ret, assignedNode
+}
+
+func (n *NodeImpl) UpAdjustMaxVolumeCountDelta(maxVolumeCountDelta int) { //can be negative
+	n.maxVolumeCount += maxVolumeCountDelta
+	if n.parent != nil {
+		n.parent.UpAdjustMaxVolumeCountDelta(maxVolumeCountDelta)
+	}
+}
+func (n *NodeImpl) UpAdjustVolumeCountDelta(volumeCountDelta int) { //can be negative
+	n.volumeCount += volumeCountDelta
+	if n.parent != nil {
+		n.parent.UpAdjustVolumeCountDelta(volumeCountDelta)
+	}
+}
+func (n *NodeImpl) UpAdjustActiveVolumeCountDelta(activeVolumeCountDelta int) { //can be negative
+	n.activeVolumeCount += activeVolumeCountDelta
+	if n.parent != nil {
+		n.parent.UpAdjustActiveVolumeCountDelta(activeVolumeCountDelta)
+	}
+}
+func (n *NodeImpl) UpAdjustMaxVolumeId(vid storage.VolumeId) { //can be negative
+	if n.maxVolumeId < vid {
+		n.maxVolumeId = vid
+		if n.parent != nil {
+			n.parent.UpAdjustMaxVolumeId(vid)
+		}
+	}
+}
+func (n *NodeImpl) GetMaxVolumeId() storage.VolumeId {
+	return n.maxVolumeId
+}
+func (n *NodeImpl) GetVolumeCount() int {
+	return n.volumeCount
+}
+func (n *NodeImpl) GetActiveVolumeCount() int {
+	return n.activeVolumeCount
+}
+func (n *NodeImpl) GetMaxVolumeCount() int {
+	return n.maxVolumeCount
+}
+
+func (n *NodeImpl) LinkChildNode(node Node) {
+	if n.children[node.Id()] == nil {
+		n.children[node.Id()] = node
+		n.UpAdjustMaxVolumeCountDelta(node.GetMaxVolumeCount())
+		n.UpAdjustMaxVolumeId(node.GetMaxVolumeId())
+		n.UpAdjustVolumeCountDelta(node.GetVolumeCount())
+		n.UpAdjustActiveVolumeCountDelta(node.GetActiveVolumeCount())
+		node.SetParent(n)
+		fmt.Println(n, "adds child", node.Id())
+	}
+}
+
+func (n *NodeImpl) UnlinkChildNode(nodeId NodeId) {
+	node := n.children[nodeId]
+	node.SetParent(nil)
+	if node != nil {
+		delete(n.children, node.Id())
+		n.UpAdjustVolumeCountDelta(-node.GetVolumeCount())
+		n.UpAdjustActiveVolumeCountDelta(-node.GetActiveVolumeCount())
+		n.UpAdjustMaxVolumeCountDelta(-node.GetMaxVolumeCount())
+		fmt.Println(n, "removes", node, "volumeCount =", n.activeVolumeCount)
+	}
+}
+
+func (n *NodeImpl) CollectDeadNodeAndFullVolumes(freshThreshHold int64, volumeSizeLimit uint64) {
+	if n.IsRack() {
+		for _, c := range n.Children() {
+			dn := c.(*DataNode) //can not cast n to DataNode
+			if dn.LastSeen < freshThreshHold {
+				if !dn.Dead {
+					dn.Dead = true
+					n.GetTopology().chanDeadDataNodes <- dn
+				}
+			}
+			for _, v := range dn.volumes {
+				if uint64(v.Size) >= volumeSizeLimit {
+					//fmt.Println("volume",v.Id,"size",v.Size,">",volumeSizeLimit)
+					n.GetTopology().chanFullVolumes <- v
+				}
+			}
+		}
+	} else {
+		for _, c := range n.Children() {
+			c.CollectDeadNodeAndFullVolumes(freshThreshHold, volumeSizeLimit)
+		}
+	}
+}
+
+func (n *NodeImpl) GetTopology() *Topology {
+	var p Node
+	p = n
+	for p.Parent() != nil {
+		p = p.Parent()
+	}
+	return p.GetValue().(*Topology)
+}