forked from cockroachdb/cockroach
/
node.go
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/
node.go
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// Copyright 2015 The Cockroach Authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
// implied. See the License for the specific language governing
// permissions and limitations under the License.
//
// Author: Bram Gruneir (bram+code@cockroachlabs.com)
package main
import (
"bytes"
"fmt"
"github.com/cockroachdb/cockroach/gossip"
"github.com/cockroachdb/cockroach/roachpb"
)
// Node is a simulated cockroach node.
type Node struct {
desc roachpb.NodeDescriptor
stores map[roachpb.StoreID]*Store
gossip *gossip.Gossip
}
// newNode creates a new node with no stores.
func newNode(nodeID roachpb.NodeID, gossip *gossip.Gossip) *Node {
node := &Node{
desc: roachpb.NodeDescriptor{
NodeID: nodeID,
},
stores: make(map[roachpb.StoreID]*Store),
gossip: gossip,
}
return node
}
// getNextStoreID gets the store ID that should be used when adding a new store
// to the node.
func (n *Node) getNextStoreID() roachpb.StoreID {
return roachpb.StoreID((int(n.desc.NodeID) * 1000) + len(n.stores))
}
// addNewStore creates a new store and adds it to the node.
func (n *Node) addNewStore() *Store {
newStoreID := n.getNextStoreID()
newStore := newStore(newStoreID, n.desc, n.gossip)
n.stores[newStoreID] = newStore
return newStore
}
// String returns the current status of the node for human readable printing.
func (n *Node) String() string {
var buf bytes.Buffer
fmt.Fprintf(&buf, "Node %d - Stores:[", n.desc.NodeID)
first := true
for storeID := range n.stores {
if first {
first = false
} else {
buf.WriteString(",")
}
buf.WriteString(storeID.String())
}
buf.WriteString("]")
return buf.String()
}