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47 lines
1.2 KiB
Go
47 lines
1.2 KiB
Go
// Copyright 2020 The LevelDB-Go and Pebble Authors. All rights reserved. Use
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// of this source code is governed by a BSD-style license that can be found in
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// the LICENSE file.
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package cache
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// Value holds a reference counted immutable value.
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type Value struct {
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buf []byte
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// Reference count for the value. The value is freed when the reference count
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// drops to zero.
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ref refcnt
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}
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// Buf returns the buffer associated with the value. The contents of the buffer
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// should not be changed once the value has been added to the cache. Instead, a
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// new Value should be created and added to the cache to replace the existing
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// value.
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func (v *Value) Buf() []byte {
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if v == nil {
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return nil
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}
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return v.buf
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}
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// Truncate the buffer to the specified length. The buffer length should not be
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// changed once the value has been added to the cache as there may be
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// concurrent readers of the Value. Instead, a new Value should be created and
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// added to the cache to replace the existing value.
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func (v *Value) Truncate(n int) {
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v.buf = v.buf[:n]
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}
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func (v *Value) refs() int32 {
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return v.ref.refs()
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}
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func (v *Value) acquire() {
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v.ref.acquire()
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}
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func (v *Value) release() {
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if v != nil && v.ref.release() {
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v.free()
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}
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}
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