seaweedfs/weed/mount/page_writer/page_chunk_mem.go

109 lines
2.5 KiB
Go

package page_writer
import (
"github.com/seaweedfs/seaweedfs/weed/util"
"github.com/seaweedfs/seaweedfs/weed/util/mem"
"sync"
"sync/atomic"
)
var (
_ = PageChunk(&MemChunk{})
memChunkCounter int64
)
type MemChunk struct {
sync.RWMutex
buf []byte
usage *ChunkWrittenIntervalList
chunkSize int64
logicChunkIndex LogicChunkIndex
activityScore *ActivityScore
}
func NewMemChunk(logicChunkIndex LogicChunkIndex, chunkSize int64) *MemChunk {
atomic.AddInt64(&memChunkCounter, 1)
return &MemChunk{
logicChunkIndex: logicChunkIndex,
chunkSize: chunkSize,
buf: mem.Allocate(int(chunkSize)),
usage: newChunkWrittenIntervalList(),
activityScore: NewActivityScore(),
}
}
func (mc *MemChunk) FreeResource() {
mc.Lock()
defer mc.Unlock()
atomic.AddInt64(&memChunkCounter, -1)
mem.Free(mc.buf)
}
func (mc *MemChunk) WriteDataAt(src []byte, offset int64, tsNs int64) (n int) {
mc.Lock()
defer mc.Unlock()
innerOffset := offset % mc.chunkSize
n = copy(mc.buf[innerOffset:], src)
mc.usage.MarkWritten(innerOffset, innerOffset+int64(n), tsNs)
mc.activityScore.MarkWrite()
return
}
func (mc *MemChunk) ReadDataAt(p []byte, off int64, tsNs int64) (maxStop int64) {
mc.RLock()
defer mc.RUnlock()
memChunkBaseOffset := int64(mc.logicChunkIndex) * mc.chunkSize
for t := mc.usage.head.next; t != mc.usage.tail; t = t.next {
logicStart := max(off, memChunkBaseOffset+t.StartOffset)
logicStop := min(off+int64(len(p)), memChunkBaseOffset+t.stopOffset)
if logicStart < logicStop {
if t.TsNs >= tsNs {
copy(p[logicStart-off:logicStop-off], mc.buf[logicStart-memChunkBaseOffset:logicStop-memChunkBaseOffset])
maxStop = max(maxStop, logicStop)
} else {
println("read old data1", tsNs-t.TsNs, "ns")
}
}
}
mc.activityScore.MarkRead()
return
}
func (mc *MemChunk) IsComplete() bool {
mc.RLock()
defer mc.RUnlock()
return mc.usage.IsComplete(mc.chunkSize)
}
func (mc *MemChunk) ActivityScore() int64 {
return mc.activityScore.ActivityScore()
}
func (mc *MemChunk) WrittenSize() int64 {
mc.RLock()
defer mc.RUnlock()
return mc.usage.WrittenSize()
}
func (mc *MemChunk) SaveContent(saveFn SaveToStorageFunc) {
mc.RLock()
defer mc.RUnlock()
if saveFn == nil {
return
}
for t := mc.usage.head.next; t != mc.usage.tail; t = t.next {
reader := util.NewBytesReader(mc.buf[t.StartOffset:t.stopOffset])
saveFn(reader, int64(mc.logicChunkIndex)*mc.chunkSize+t.StartOffset, t.Size(), t.TsNs, func() {
})
}
}