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37 lines
631 B
Go
37 lines
631 B
Go
package sequence
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import (
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"sync"
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)
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// default Sequencer
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type MemorySequencer struct {
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counter uint64
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sequenceLock sync.Mutex
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}
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func NewMemorySequencer() (m *MemorySequencer) {
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m = &MemorySequencer{counter: 1}
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return
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}
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func (m *MemorySequencer) NextFileId(count uint64) uint64 {
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m.sequenceLock.Lock()
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defer m.sequenceLock.Unlock()
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ret := m.counter
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m.counter += count
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return ret
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}
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func (m *MemorySequencer) SetMax(seenValue uint64) {
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m.sequenceLock.Lock()
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defer m.sequenceLock.Unlock()
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if m.counter <= seenValue {
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m.counter = seenValue + 1
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}
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}
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func (m *MemorySequencer) Peek() uint64 {
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return m.counter
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}
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