mirror of
https://github.com/minio/minio.git
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66 lines
1.7 KiB
Go
66 lines
1.7 KiB
Go
/*
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* Minimalist Object Storage, (C) 2015 Minio, Inc.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package memory
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import (
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"io"
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"sync"
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)
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// BlockingWriteCloser is a WriteCloser that blocks until released
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type BlockingWriteCloser struct {
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w io.WriteCloser
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release *sync.WaitGroup
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err error
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}
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// Write to the underlying writer
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func (b *BlockingWriteCloser) Write(p []byte) (int, error) {
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n, err := b.w.Write(p)
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if err != nil {
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b.err = err
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}
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return n, b.err
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}
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// Close blocks until another goroutine calls Release(error). Returns error code if either
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// writer fails or Release is called with an error.
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func (b *BlockingWriteCloser) Close() error {
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err := b.w.Close()
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if err != nil {
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b.err = err
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}
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b.release.Wait()
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return b.err
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}
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// Release the Close, causing it to unblock. Only call this once. Calling it multiple times results in a panic.
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func (b *BlockingWriteCloser) Release(err error) {
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b.release.Done()
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if err != nil {
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b.err = err
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}
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return
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}
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// NewBlockingWriteCloser Creates a new write closer that must be released by the read consumer.
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func NewBlockingWriteCloser(w io.WriteCloser) *BlockingWriteCloser {
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wg := &sync.WaitGroup{}
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wg.Add(1)
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return &BlockingWriteCloser{w: w, release: wg}
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}
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