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// Copyright 2018 The go-ethereum Authors
// This file is part of the go-ethereum library.
//
// The go-ethereum library is free software: you can redistribute it and/or modify
// it under the terms of the GNU Lesser General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// The go-ethereum library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public License
// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
// memory storage layer for the package blockhash
package storage
import (
"context"
lru "github.com/hashicorp/golang-lru"
)
type MemStore struct {
cache *lru.Cache
disabled bool
}
//NewMemStore is instantiating a MemStore cache keeping all frequently requested
//chunks in the `cache` LRU cache.
func NewMemStore(params *StoreParams, _ *LDBStore) (m *MemStore) {
if params.CacheCapacity == 0 {
return &MemStore{
disabled: true,
}
}
c, err := lru.New(int(params.CacheCapacity))
if err != nil {
panic(err)
}
return &MemStore{
cache: c,
}
}
func (m *MemStore) Get(_ context.Context, addr Address) (Chunk, error) {
if m.disabled {
return nil, ErrChunkNotFound
}
c, ok := m.cache.Get(string(addr))
if !ok {
return nil, ErrChunkNotFound
}
return c.(*chunk), nil
}
func (m *MemStore) Put(_ context.Context, c Chunk) error {
if m.disabled {
return nil
}
m.cache.Add(string(c.Address()), c)
return nil
}
func (m *MemStore) setCapacity(n int) {
if n <= 0 {
m.disabled = true
} else {
c, err := lru.New(n)
if err != nil {
panic(err)
}
*m = MemStore{
cache: c,
}
}
}
func (s *MemStore) Close() {}
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