wehub-resource-sync
135 lines
2.3 KiB
Go
135 lines
2.3 KiB
Go
/*
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* Copyright 2025 CloudWeGo Authors
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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 adk
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import "sync"
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type turnBuffer[T any] struct {
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buf []T
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mu sync.Mutex
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notEmpty *sync.Cond
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closed bool
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woken bool
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}
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func newTurnBuffer[T any]() *turnBuffer[T] {
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tb := &turnBuffer[T]{}
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tb.notEmpty = sync.NewCond(&tb.mu)
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return tb
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}
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func (tb *turnBuffer[T]) Send(value T) {
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tb.mu.Lock()
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defer tb.mu.Unlock()
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if tb.closed {
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panic("turnBuffer: send on closed buffer")
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}
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tb.buf = append(tb.buf, value)
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tb.notEmpty.Signal()
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}
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func (tb *turnBuffer[T]) TrySend(value T) bool {
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tb.mu.Lock()
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defer tb.mu.Unlock()
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if tb.closed {
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return false
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}
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tb.buf = append(tb.buf, value)
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tb.notEmpty.Signal()
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return true
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}
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func (tb *turnBuffer[T]) Receive() (T, bool) {
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tb.mu.Lock()
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defer tb.mu.Unlock()
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for len(tb.buf) == 0 && !tb.closed && !tb.woken {
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tb.notEmpty.Wait()
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}
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tb.woken = false
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if len(tb.buf) == 0 {
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var zero T
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return zero, false
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}
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val := tb.buf[0]
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tb.buf = tb.buf[1:]
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return val, true
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}
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func (tb *turnBuffer[T]) Close() {
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tb.mu.Lock()
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defer tb.mu.Unlock()
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if !tb.closed {
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tb.closed = true
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tb.notEmpty.Broadcast()
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}
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}
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func (tb *turnBuffer[T]) IsClosed() bool {
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tb.mu.Lock()
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defer tb.mu.Unlock()
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return tb.closed
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}
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func (tb *turnBuffer[T]) TakeAll() []T {
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tb.mu.Lock()
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defer tb.mu.Unlock()
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if len(tb.buf) == 0 {
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return nil
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}
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values := tb.buf
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tb.buf = nil
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return values
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}
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func (tb *turnBuffer[T]) PushFront(values []T) {
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if len(values) == 0 {
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return
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}
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tb.mu.Lock()
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defer tb.mu.Unlock()
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tb.buf = append(append([]T{}, values...), tb.buf...)
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tb.notEmpty.Signal()
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}
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func (tb *turnBuffer[T]) Wakeup() {
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tb.mu.Lock()
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defer tb.mu.Unlock()
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tb.woken = true
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tb.notEmpty.Broadcast()
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}
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func (tb *turnBuffer[T]) ClearWakeup() {
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tb.mu.Lock()
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defer tb.mu.Unlock()
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tb.woken = false
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}
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