| // Copyright 2020 Mostyn Bramley-Moore. |
| // |
| // Licensed under the Apache License, Version 2.0 (the "License"); |
| // you may not use this file except in compliance with the License. |
| // You may obtain a copy of the License at |
| // |
| // http://www.apache.org/licenses/LICENSE-2.0 |
| // |
| // Unless required by applicable law or agreed to in writing, software |
| // distributed under the License is distributed on an "AS IS" BASIS, |
| // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| // See the License for the specific language governing permissions and |
| // limitations under the License. |
| |
| package syncpool |
| |
| import ( |
| "runtime" |
| "sync" |
| |
| "github.com/klauspost/compress/zstd" |
| ) |
| |
| // EncoderWrapper is a wrapper that embeds a *zstd.Encoder, and is safe for |
| // use in a sync.Pool. |
| type EncoderWrapper struct { |
| *zstd.Encoder |
| } |
| |
| // NewEncoderPool returns a sync.Pool that provides EncoderWrapper |
| // objects which embed a *zstd.Encoder. You probably want to include |
| // zstd.WithEncoderConcurrency(1) in the list of options. |
| func NewEncoderPool(options ...zstd.EOption) *sync.Pool { |
| p := &sync.Pool{} |
| |
| p.New = func() interface{} { |
| e, _ := zstd.NewWriter(nil, options...) |
| ew := &EncoderWrapper{Encoder: e} |
| |
| runtime.SetFinalizer(ew, func(ew *EncoderWrapper) { |
| ew.Encoder.Close() |
| }) |
| |
| return ew |
| } |
| |
| return p |
| } |
