internal

Documentation

Index

• func NewCacheMergeIterator(parent, cache types.Iterator, ascending bool) types.Iterator
• type BTree
  • func NewBTree() BTree
  • func (bt BTree) Copy() BTree
  • func (bt BTree) Delete(key []byte)
  • func (bt BTree) Get(key []byte) []byte
  • func (bt BTree) Iterator(start, end []byte) (types.Iterator, error)
  • func (bt BTree) ReverseIterator(start, end []byte) (types.Iterator, error)
  • func (bt BTree) Set(key, value []byte)

Functions

func NewCacheMergeIterator

func NewCacheMergeIterator(parent, cache types.Iterator, ascending bool) types.Iterator

Types

type BTree

type BTree struct {
	// contains filtered or unexported fields
}

BTree implements the sorted cache for cachekv store, we don't use MemDB here because cachekv is used extensively in sdk core path, we need it to be as fast as possible, while `MemDB` is mainly used as a mocking db in unit tests.

We choose tidwall/btree over google/btree here because it provides API to implement step iterator directly.

func NewBTree

func NewBTree() BTree

NewBTree creates a wrapper around `btree.BTreeG`.

func (BTree) Copy

func (bt BTree) Copy() BTree

Copy the tree. This is a copy-on-write operation and is very fast because it only performs a shadowed copy.

func (BTree) Delete

func (bt BTree) Delete(key []byte)

func (BTree) Get

func (bt BTree) Get(key []byte) []byte

func (BTree) Iterator

func (bt BTree) Iterator(start, end []byte) (types.Iterator, error)

func (BTree) ReverseIterator

func (bt BTree) ReverseIterator(start, end []byte) (types.Iterator, error)

func (BTree) Set

func (bt BTree) Set(key, value []byte)