func constructCompleteLevel2(self *BTree, order, skip int) {
dirty := dirty.New(100)
n := order * (order + 2)
if skip <= n {
n++
}
root := self.getblock(self.info.Root())
dirty.Insert(root)
cur := self.allocate()
dirty.Insert(cur)
for i := 0; i < n; i++ {
if i+1 == skip {
continue
}
rec := makerec(self, ByteSlice32(uint32(i+1)))
if cur.Full() {
root.InsertPointer(int(root.PointerCount()), cur.Position())
cur = self.allocate()
dirty.Insert(cur)
root.Add(rec)
} else {
cur.Add(rec)
}
}
root.InsertPointer(int(root.PointerCount()), cur.Position())
dirty.Sync()
self.info.SetHeight(2)
}
func (self *BTree) Insert(key ByteSlice, record []ByteSlice) bool {
dirty := dirty.New(self.info.Height() * 4) // this is our buffer of "dirty" blocks that we will write back at the end
if !self.ValidateKey(key) || !self.ValidateRecord(record) {
return false
}
// makes the record
rec := self.node.NewRecord(key)
for i, f := range record {
rec.Set(uint32(i), f)
}
// insert the block if split is true then we need to split the root
if b, r, split := self.insert(self.getblock(self.info.Root()), rec, self.info.Height()-1, dirty); split {
// root split
// first allocate a new root then insert the key record and the associated pointers
root := self.allocate()
dirty.Insert(root)
if i, ok := root.Add(r); ok {
root.InsertPointer(i, self.info.Root())
root.InsertPointer(i+1, b.Position())
} else {
fmt.Println("Could not insert into empty block PANIC")
os.Exit(2)
return false
}
// don't forget to update the height of the tree and the root
self.info.SetRoot(root.Position())
self.info.SetHeight(self.info.Height() + 1)
}
dirty.Sync() // writes the dirty blocks to disk
return true
}
func TestGetBlock(t *testing.T) {
t.Log("------- TestGetBlock -------")
self := makebptree(BLOCKSIZE, t)
defer cleanbptree(self)
dirty := dirty.New(self.info.Height() * 4)
b1 := self.allocate(self.internal)
b2 := self.allocate(self.external)
dirty.Insert(b1)
dirty.Insert(b2)
dirty.Sync()
b1_ := self.getblock(b1.Position())
b2_ := self.getblock(b2.Position())
if b1_ == nil || b2_ == nil {
t.Error("getblock return nil")
}
b1s, _ := b1.Serialize()
b2s, _ := b2.Serialize()
b1_s, _ := b1_.Serialize()
b2_s, _ := b2_.Serialize()
if !ByteSlice(b1s).Eq(ByteSlice(b1_s)) {
t.Error("block read from file is not the same as the one written out for b1")
}
if !ByteSlice(b2s).Eq(ByteSlice(b2_s)) {
t.Error("block read from file is not the same as the one written out for b2")
}
}
func make_complete(self *BpTree, skip int, t *testing.T) {
dirty := dirty.New(self.internal.KeysPerBlock() * 3)
n := int(self.external.KeysPerBlock())
m := n * n
if skip < m {
m++
}
c := self.getblock(self.info.Root())
root := self.allocate(self.internal)
self.info.SetRoot(root.Position())
dirty.Insert(c)
dirty.Insert(root)
first := 0
if first == skip {
first = 1
}
r, _ := pkg_rec(self, ByteSlice32(uint32(first)), record)
if p, ok := root.Add(r.internal()); ok {
root.InsertPointer(p, c.Position())
} else {
t.Fatal("could not add a record to the root")
}
for i := 0; i < m; i++ {
if i == skip {
continue
}
r, _ := pkg_rec(self, ByteSlice32(uint32(i)), record)
if c.Full() {
c = self.allocate(self.external)
dirty.Insert(c)
if p, ok := root.Add(r.internal()); ok {
root.InsertPointer(p, c.Position())
} else {
t.Fatal("could not add a record to the root")
}
}
if _, ok := c.Add(r.external()); !ok {
t.Fatal("could not add a record to the leaf")
}
}
dirty.Sync()
self.info.SetHeight(2)
}
func (self *BpTree) Insert(key ByteSlice, record []ByteSlice) bool {
self.lock.Lock()
defer self.lock.Unlock()
dirty := dirty.New(self.info.Height() * 4)
// package the temp rec
rec, valid := pkg_rec(self, key, record)
if !valid {
fmt.Fprintln(os.Stderr, "key or record not valid")
return false
}
// insert the block if split is true then we need to split the root
if b, r, split := self.insert(self.getblock(self.info.Root()), rec, self.info.Height()-1, dirty); split {
// This is where the root split goes.
// we have to sync the blocks back because the first key in the root will have been
// modified if the key we inserted was less than any key in the b+ tree
dirty.Sync()
// we get the oldroot so we can get the first key from it, this key becomes the first key in
// the new root.
oldroot := self.getblock(self.info.Root())
var first *tmprec
if f, _, _, ok := oldroot.Get(0); ok {
first = rec_to_tmp(self, f)
}
// first allocate a new root then insert the key record and the associated pointers
root := self.allocate(self.internal) // the new root will always be an internal node
dirty.Insert(root)
// first we insert the first key from the old root into the new root and point it at the
// old root
if i, ok := root.Add(first.internal()); ok {
root.InsertPointer(i, self.info.Root())
} else {
fmt.Println("431 Could not insert into empty block PANIC")
os.Exit(2)
return false
}
// then we point the split rec's key at the the split block
if i, ok := root.Add(r.internal()); ok {
root.InsertPointer(i, b.Position())
} else {
fmt.Println("440 Could not insert into empty block PANIC\n", r, "\n", root, oldroot)
os.Exit(2)
return false
}
// don't forget to update the height of the tree and the root
self.info.SetRoot(root.Position())
self.info.SetHeight(self.info.Height() + 1)
}
// at the end of of the method sync back the dirty blocks
self.info.IncEntries()
self.info.Serialize()
dirty.Sync()
return true
}