mirror of
https://github.com/ceph/ceph-csi.git
synced 2024-12-24 14:00:19 +00:00
5090c4171b
Bumps [google.golang.org/grpc](https://github.com/grpc/grpc-go) from 1.57.0 to 1.58.0. - [Release notes](https://github.com/grpc/grpc-go/releases) - [Commits](https://github.com/grpc/grpc-go/compare/v1.57.0...v1.58.0) --- updated-dependencies: - dependency-name: google.golang.org/grpc dependency-type: direct:production update-type: version-update:semver-minor ... Signed-off-by: dependabot[bot] <support@github.com>
106 lines
2.8 KiB
Go
106 lines
2.8 KiB
Go
/*
|
|
* Copyright 2019 gRPC authors.
|
|
*
|
|
* 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 buffer provides an implementation of an unbounded buffer.
|
|
package buffer
|
|
|
|
import "sync"
|
|
|
|
// Unbounded is an implementation of an unbounded buffer which does not use
|
|
// extra goroutines. This is typically used for passing updates from one entity
|
|
// to another within gRPC.
|
|
//
|
|
// All methods on this type are thread-safe and don't block on anything except
|
|
// the underlying mutex used for synchronization.
|
|
//
|
|
// Unbounded supports values of any type to be stored in it by using a channel
|
|
// of `any`. This means that a call to Put() incurs an extra memory allocation,
|
|
// and also that users need a type assertion while reading. For performance
|
|
// critical code paths, using Unbounded is strongly discouraged and defining a
|
|
// new type specific implementation of this buffer is preferred. See
|
|
// internal/transport/transport.go for an example of this.
|
|
type Unbounded struct {
|
|
c chan any
|
|
closed bool
|
|
mu sync.Mutex
|
|
backlog []any
|
|
}
|
|
|
|
// NewUnbounded returns a new instance of Unbounded.
|
|
func NewUnbounded() *Unbounded {
|
|
return &Unbounded{c: make(chan any, 1)}
|
|
}
|
|
|
|
// Put adds t to the unbounded buffer.
|
|
func (b *Unbounded) Put(t any) {
|
|
b.mu.Lock()
|
|
defer b.mu.Unlock()
|
|
if b.closed {
|
|
return
|
|
}
|
|
if len(b.backlog) == 0 {
|
|
select {
|
|
case b.c <- t:
|
|
return
|
|
default:
|
|
}
|
|
}
|
|
b.backlog = append(b.backlog, t)
|
|
}
|
|
|
|
// Load sends the earliest buffered data, if any, onto the read channel
|
|
// returned by Get(). Users are expected to call this every time they read a
|
|
// value from the read channel.
|
|
func (b *Unbounded) Load() {
|
|
b.mu.Lock()
|
|
defer b.mu.Unlock()
|
|
if b.closed {
|
|
return
|
|
}
|
|
if len(b.backlog) > 0 {
|
|
select {
|
|
case b.c <- b.backlog[0]:
|
|
b.backlog[0] = nil
|
|
b.backlog = b.backlog[1:]
|
|
default:
|
|
}
|
|
}
|
|
}
|
|
|
|
// Get returns a read channel on which values added to the buffer, via Put(),
|
|
// are sent on.
|
|
//
|
|
// Upon reading a value from this channel, users are expected to call Load() to
|
|
// send the next buffered value onto the channel if there is any.
|
|
//
|
|
// If the unbounded buffer is closed, the read channel returned by this method
|
|
// is closed.
|
|
func (b *Unbounded) Get() <-chan any {
|
|
return b.c
|
|
}
|
|
|
|
// Close closes the unbounded buffer.
|
|
func (b *Unbounded) Close() {
|
|
b.mu.Lock()
|
|
defer b.mu.Unlock()
|
|
if b.closed {
|
|
return
|
|
}
|
|
b.closed = true
|
|
close(b.c)
|
|
}
|