mirror of https://github.com/poanetwork/quorum.git
121 lines
2.8 KiB
Go
121 lines
2.8 KiB
Go
// Copyright 2015 The go-ethereum Authors
|
|
// This file is part of go-ethereum.
|
|
//
|
|
// go-ethereum 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.
|
|
//
|
|
// go-ethereum 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 go-ethereum. If not, see <http://www.gnu.org/licenses/>.
|
|
|
|
package core
|
|
|
|
import (
|
|
"sync"
|
|
|
|
"github.com/ethereum/go-ethereum/common"
|
|
"github.com/ethereum/go-ethereum/core/types"
|
|
)
|
|
|
|
// BlockCache implements a caching mechanism specifically for blocks and uses FILO to pop
|
|
type BlockCache struct {
|
|
size int
|
|
|
|
hashes []common.Hash
|
|
blocks map[common.Hash]*types.Block
|
|
|
|
mu sync.RWMutex
|
|
}
|
|
|
|
// Creates and returns a `BlockCache` with `size`. If `size` is smaller than 1 it will panic
|
|
func NewBlockCache(size int) *BlockCache {
|
|
if size < 1 {
|
|
panic("block cache size not allowed to be smaller than 1")
|
|
}
|
|
|
|
bc := &BlockCache{size: size}
|
|
bc.Clear()
|
|
return bc
|
|
}
|
|
|
|
func (bc *BlockCache) Clear() {
|
|
bc.blocks = make(map[common.Hash]*types.Block)
|
|
bc.hashes = nil
|
|
|
|
}
|
|
|
|
func (bc *BlockCache) Push(block *types.Block) {
|
|
bc.mu.Lock()
|
|
defer bc.mu.Unlock()
|
|
|
|
if len(bc.hashes) == bc.size {
|
|
delete(bc.blocks, bc.hashes[0])
|
|
|
|
// XXX There are a few other options on solving this
|
|
// 1) use a poller / GC like mechanism to clean up untracked objects
|
|
// 2) copy as below
|
|
// re-use the slice and remove the reference to bc.hashes[0]
|
|
// this will allow the element to be garbage collected.
|
|
copy(bc.hashes, bc.hashes[1:])
|
|
} else {
|
|
bc.hashes = append(bc.hashes, common.Hash{})
|
|
}
|
|
|
|
hash := block.Hash()
|
|
bc.blocks[hash] = block
|
|
bc.hashes[len(bc.hashes)-1] = hash
|
|
}
|
|
|
|
func (bc *BlockCache) Delete(hash common.Hash) {
|
|
bc.mu.Lock()
|
|
defer bc.mu.Unlock()
|
|
|
|
if _, ok := bc.blocks[hash]; ok {
|
|
delete(bc.blocks, hash)
|
|
for i, h := range bc.hashes {
|
|
if hash == h {
|
|
bc.hashes = bc.hashes[:i+copy(bc.hashes[i:], bc.hashes[i+1:])]
|
|
// or ? => bc.hashes = append(bc.hashes[:i], bc.hashes[i+1]...)
|
|
|
|
break
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
func (bc *BlockCache) Get(hash common.Hash) *types.Block {
|
|
bc.mu.RLock()
|
|
defer bc.mu.RUnlock()
|
|
|
|
if block, haz := bc.blocks[hash]; haz {
|
|
return block
|
|
}
|
|
|
|
return nil
|
|
}
|
|
|
|
func (bc *BlockCache) Has(hash common.Hash) bool {
|
|
bc.mu.RLock()
|
|
defer bc.mu.RUnlock()
|
|
|
|
_, ok := bc.blocks[hash]
|
|
return ok
|
|
}
|
|
|
|
func (bc *BlockCache) Each(cb func(int, *types.Block)) {
|
|
bc.mu.Lock()
|
|
defer bc.mu.Unlock()
|
|
|
|
i := 0
|
|
for _, block := range bc.blocks {
|
|
cb(i, block)
|
|
i++
|
|
}
|
|
}
|