110 lines
2.5 KiB
Go
110 lines
2.5 KiB
Go
/*
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Copyright 2019 The Kubernetes Authors.
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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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http://www.apache.org/licenses/LICENSE-2.0
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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 v1alpha1
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import (
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"sync"
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"k8s.io/api/core/v1"
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"k8s.io/apimachinery/pkg/types"
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)
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// waitingPodsMap a thread-safe map used to maintain pods waiting in the permit phase.
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type waitingPodsMap struct {
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pods map[types.UID]WaitingPod
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mu sync.RWMutex
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}
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// newWaitingPodsMap returns a new waitingPodsMap.
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func newWaitingPodsMap() *waitingPodsMap {
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return &waitingPodsMap{
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pods: make(map[types.UID]WaitingPod),
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}
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}
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// add a new WaitingPod to the map.
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func (m *waitingPodsMap) add(wp WaitingPod) {
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m.mu.Lock()
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defer m.mu.Unlock()
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m.pods[wp.GetPod().UID] = wp
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}
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// remove a WaitingPod from the map.
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func (m *waitingPodsMap) remove(uid types.UID) {
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m.mu.Lock()
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defer m.mu.Unlock()
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delete(m.pods, uid)
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}
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// get a WaitingPod from the map.
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func (m *waitingPodsMap) get(uid types.UID) WaitingPod {
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m.mu.RLock()
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defer m.mu.RUnlock()
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return m.pods[uid]
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}
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// iterate acquires a read lock and iterates over the WaitingPods map.
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func (m *waitingPodsMap) iterate(callback func(WaitingPod)) {
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m.mu.RLock()
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defer m.mu.RUnlock()
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for _, v := range m.pods {
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callback(v)
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}
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}
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// waitingPod represents a pod waiting in the permit phase.
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type waitingPod struct {
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pod *v1.Pod
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s chan *Status
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}
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// newWaitingPod returns a new waitingPod instance.
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func newWaitingPod(pod *v1.Pod) *waitingPod {
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return &waitingPod{
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pod: pod,
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s: make(chan *Status),
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}
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}
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// GetPod returns a reference to the waiting pod.
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func (w *waitingPod) GetPod() *v1.Pod {
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return w.pod
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}
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// Allow the waiting pod to be scheduled. Returns true if the allow signal was
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// successfully delivered, false otherwise.
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func (w *waitingPod) Allow() bool {
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select {
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case w.s <- NewStatus(Success, ""):
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return true
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default:
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return false
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}
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}
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// Reject declares the waiting pod unschedulable. Returns true if the allow signal
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// was successfully delivered, false otherwise.
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func (w *waitingPod) Reject(msg string) bool {
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select {
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case w.s <- NewStatus(Unschedulable, msg):
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return true
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default:
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return false
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}
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}
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