418b553920
It was added back in 2fb379b7 when we had many shard modes. Now we have
only two and comments for constants are rather descriptive.
Signed-off-by: Evgenii Stratonikov <evgeniy@nspcc.ru>
65 lines
1.3 KiB
Go
65 lines
1.3 KiB
Go
package shard
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import (
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"errors"
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"github.com/nspcc-dev/neofs-node/pkg/local_object_storage/writecache"
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)
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// Mode represents enumeration of Shard work modes.
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type Mode uint32
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// ErrReadOnlyMode is returned when it is impossible to apply operation
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// that changes shard's memory due to the "read-only" shard's mode.
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var ErrReadOnlyMode = errors.New("shard is in read-only mode")
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const (
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// ModeReadWrite is a Mode value for shard that is available
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// for read and write operations. Default shard mode.
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ModeReadWrite Mode = iota
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// ModeReadOnly is a Mode value for shard that does not
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// accept write operation but is readable.
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ModeReadOnly
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)
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func (m Mode) String() string {
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switch m {
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default:
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return "UNDEFINED"
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case ModeReadWrite:
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return "READ_WRITE"
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case ModeReadOnly:
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return "READ_ONLY"
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}
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}
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// SetMode sets mode of the shard.
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//
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// Returns any error encountered that did not allow
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// setting shard mode.
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func (s *Shard) SetMode(m Mode) error {
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s.m.Lock()
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defer s.m.Unlock()
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if s.hasWriteCache() {
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switch m {
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case ModeReadOnly:
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s.writeCache.SetMode(writecache.ModeReadOnly)
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case ModeReadWrite:
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s.writeCache.SetMode(writecache.ModeReadWrite)
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}
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}
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s.info.Mode = m
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return nil
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}
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// GetMode returns mode of the shard.
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func (s *Shard) GetMode() Mode {
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s.m.RLock()
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defer s.m.RUnlock()
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return s.info.Mode
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}
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