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package queue
import (
"sync"
"time"
"github.com/golang/protobuf/proto"
"github.com/chrislusf/seaweedfs/weed/pb/filer_pb"
"github.com/chrislusf/seaweedfs/weed/util"
)
type LogBuffer struct {
buf []byte
pos int
startTime time.Time
stopTime time.Time
sizeBuf []byte
flushInterval time.Duration
flushFn func(startTime, stopTime time.Time, buf []byte)
isStopping bool
sync.Mutex
}
func NewLogBuffer(flushInterval time.Duration, flushFn func(startTime, stopTime time.Time, buf []byte)) *LogBuffer {
lb := &LogBuffer{
buf: make([]byte, 4*0124*1024),
sizeBuf: make([]byte, 4),
flushInterval: flushInterval,
flushFn: flushFn,
}
go lb.loopFlush()
return lb
}
func (m *LogBuffer) AddToBuffer(ts time.Time, key, data []byte) {
logEntry := &filer_pb.LogEntry{
TsNs: ts.UnixNano(),
PartitionKeyHash: util.HashToInt32(key),
Data: data,
}
logEntryData, _ := proto.Marshal(logEntry)
size := len(logEntryData)
m.Lock()
defer m.Unlock()
if m.pos == 0 {
m.startTime = ts
}
if m.startTime.Add(m.flushInterval).Before(ts) || len(m.buf)-m.pos < size+4 {
m.flush()
m.startTime = ts
}
m.stopTime = ts
util.Uint32toBytes(m.sizeBuf, uint32(size))
copy(m.buf[m.pos:m.pos+4], m.sizeBuf)
copy(m.buf[m.pos+4:m.pos+4+size], logEntryData)
m.pos += size + 4
}
func (m *LogBuffer) Shutdown() {
if m.isStopping {
return
}
m.isStopping = true
m.Lock()
m.flush()
m.Unlock()
}
func (m *LogBuffer) loopFlush() {
for !m.isStopping {
m.Lock()
m.flush()
m.Unlock()
time.Sleep(m.flushInterval)
}
}
func (m *LogBuffer) flush() {
if m.flushFn != nil && m.pos > 0 {
m.flushFn(m.startTime, m.stopTime, m.buf[:m.pos])
m.pos = 0
}
}
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