wehub-resource-sync
95 lines
2.4 KiB
Go
95 lines
2.4 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 internal
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import "sync"
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// UnboundedChan represents a channel with unlimited capacity
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type UnboundedChan[T any] struct {
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buffer []T // Internal buffer to store data
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mutex sync.Mutex // Mutex to protect buffer access
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notEmpty *sync.Cond // Condition variable to wait for data
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closed bool // Indicates if the channel has been closed
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}
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// NewUnboundedChan initializes and returns an UnboundedChan
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func NewUnboundedChan[T any]() *UnboundedChan[T] {
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ch := &UnboundedChan[T]{}
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ch.notEmpty = sync.NewCond(&ch.mutex)
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return ch
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}
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// Send puts an item into the channel
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func (ch *UnboundedChan[T]) Send(value T) {
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ch.mutex.Lock()
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defer ch.mutex.Unlock()
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if ch.closed {
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panic("send on closed channel")
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}
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ch.buffer = append(ch.buffer, value)
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ch.notEmpty.Signal() // Wake up one goroutine waiting to receive
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}
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// TrySend attempts to put an item into the channel.
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// Returns false if the channel is closed, true otherwise.
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func (ch *UnboundedChan[T]) TrySend(value T) bool {
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ch.mutex.Lock()
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defer ch.mutex.Unlock()
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if ch.closed {
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return false
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}
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ch.buffer = append(ch.buffer, value)
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ch.notEmpty.Signal()
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return true
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}
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// Receive gets an item from the channel (blocks if empty).
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// Returns (value, true) if an item was received.
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// Returns (zero, false) if the channel was closed with no data remaining.
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func (ch *UnboundedChan[T]) Receive() (T, bool) {
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ch.mutex.Lock()
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defer ch.mutex.Unlock()
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for len(ch.buffer) == 0 && !ch.closed {
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ch.notEmpty.Wait()
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}
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if len(ch.buffer) == 0 {
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var zero T
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return zero, false
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}
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val := ch.buffer[0]
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ch.buffer = ch.buffer[1:]
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return val, true
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}
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// Close marks the channel as closed
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func (ch *UnboundedChan[T]) Close() {
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ch.mutex.Lock()
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defer ch.mutex.Unlock()
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if !ch.closed {
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ch.closed = true
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ch.notEmpty.Broadcast()
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}
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}
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