62 lines
1.8 KiB
Go
62 lines
1.8 KiB
Go
package cache
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import (
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"k8s.io/apimachinery/pkg/labels"
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"k8s.io/klog/v2"
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clusterv1alpha1 "github.com/karmada-io/karmada/pkg/apis/cluster/v1alpha1"
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clusterlister "github.com/karmada-io/karmada/pkg/generated/listers/cluster/v1alpha1"
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"github.com/karmada-io/karmada/pkg/scheduler/framework"
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)
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// Cache is an interface for scheduler internal cache.
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type Cache interface {
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AddCluster(cluster *clusterv1alpha1.Cluster)
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UpdateCluster(cluster *clusterv1alpha1.Cluster)
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DeleteCluster(cluster *clusterv1alpha1.Cluster)
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// Snapshot returns a snapshot of the current clusters info
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Snapshot() Snapshot
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}
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type schedulerCache struct {
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clusterLister clusterlister.ClusterLister
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}
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// NewCache instantiates a cache used only by scheduler.
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func NewCache(clusterLister clusterlister.ClusterLister) Cache {
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return &schedulerCache{
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clusterLister: clusterLister,
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}
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}
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// AddCluster does nothing since clusterLister would synchronize automatically
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func (c *schedulerCache) AddCluster(_ *clusterv1alpha1.Cluster) {
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}
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// UpdateCluster does nothing since clusterLister would synchronize automatically
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func (c *schedulerCache) UpdateCluster(_ *clusterv1alpha1.Cluster) {
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}
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// DeleteCluster does nothing since clusterLister would synchronize automatically
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func (c *schedulerCache) DeleteCluster(_ *clusterv1alpha1.Cluster) {
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}
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// Snapshot returns clusters' snapshot.
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// TODO: need optimization, only clone when necessary
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func (c *schedulerCache) Snapshot() Snapshot {
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out := NewEmptySnapshot()
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clusters, err := c.clusterLister.List(labels.Everything())
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if err != nil {
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klog.Errorf("Failed to list clusters: %v", err)
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return out
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}
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out.clusterInfoList = make([]*framework.ClusterInfo, 0, len(clusters))
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for _, cluster := range clusters {
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cloned := cluster.DeepCopy()
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out.clusterInfoList = append(out.clusterInfoList, framework.NewClusterInfo(cloned))
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}
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return out
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}
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