// Snapshot places a snapshot request onto the snapshot queue.
func (bh *BufferHist) Snapshot(buff buffer.Buffer, mc cursor.MultiCursor) {
request := BufferState{
buff: buff.Dup(),
mc: mc.Dup(),
}
bh.reqMutex.Lock()
bh.snapReq = request
bh.reqMutex.Unlock()
select {
case bh.snapChan <- struct{}{}:
default:
}
}
func (bh *BufferHist) snapshot(buff buffer.Buffer, mc cursor.MultiCursor) {
curBuf, curMC := bh.Current()
curRow := curMC.GetRow(0)
newRow := mc.GetRow(0)
if curRow-newRow > 5 || newRow-curRow > 5 {
state := NewBufferState(curBuf, mc)
bh.elemMutex.Lock()
bh.element = bh.list.InsertAfter(state, bh.element)
bh.elemMutex.Unlock()
}
state := NewBufferState(buff, mc)
bh.elemMutex.Lock()
bh.element = bh.list.InsertAfter(state, bh.element)
bh.elemMutex.Unlock()
bh.trim()
}
// ForceSnapshot forces a snapshot rather than requesting one.
func (bh *BufferHist) ForceSnapshot(buff buffer.Buffer, mc cursor.MultiCursor) {
bh.snapshot(buff.Dup(), mc.Dup())
}