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Signed-off-by: Jason Liu <jasonliu747@gmail.com>
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,128 @@ | ||
| /* | ||
| Copyright 2022 The Koordinator 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 cache | ||
|
|
||
| import ( | ||
| "fmt" | ||
| "sync" | ||
| "time" | ||
|
|
||
| "k8s.io/apimachinery/pkg/util/runtime" | ||
| "k8s.io/apimachinery/pkg/util/wait" | ||
| "k8s.io/klog/v2" | ||
| ) | ||
|
|
||
| const ( | ||
| defaultExpiration = 2 * time.Minute | ||
| defaultGCInterval = time.Minute | ||
| ) | ||
|
|
||
| type item struct { | ||
| object interface{} | ||
| expirationTime time.Time | ||
| } | ||
|
|
||
| type Cache struct { | ||
| items map[string]item | ||
| defaultExpiration time.Duration | ||
| gcInterval time.Duration | ||
| gcStarted bool | ||
| mu sync.Mutex | ||
| } | ||
|
|
||
| func NewCacheDefault() *Cache { | ||
| return &Cache{ | ||
| items: map[string]item{}, | ||
| defaultExpiration: defaultExpiration, | ||
| gcInterval: defaultGCInterval, | ||
| } | ||
| } | ||
|
|
||
| func NewCache(expiration time.Duration, gcInterval time.Duration) *Cache { | ||
| cache := Cache{ | ||
| items: map[string]item{}, | ||
| defaultExpiration: expiration, | ||
| gcInterval: gcInterval, | ||
| } | ||
| if cache.defaultExpiration <= 0 { | ||
| cache.defaultExpiration = defaultExpiration | ||
| } | ||
| if cache.gcInterval <= time.Second { | ||
| cache.gcInterval = defaultGCInterval | ||
| } | ||
| return &cache | ||
| } | ||
|
|
||
| func (c *Cache) Run(stopCh <-chan struct{}) error { | ||
| defer runtime.HandleCrash() | ||
| c.gcStarted = true | ||
| go wait.Until(func() { | ||
| c.gcExpiredCache() | ||
| }, c.gcInterval, stopCh) | ||
| return nil | ||
| } | ||
|
|
||
| func (c *Cache) gcExpiredCache() { | ||
| c.mu.Lock() | ||
| defer c.mu.Unlock() | ||
| gcTime := time.Now() | ||
| var gcKeys []string | ||
| for key, item := range c.items { | ||
| if gcTime.After(item.expirationTime) { | ||
| gcKeys = append(gcKeys, key) | ||
| } | ||
| } | ||
| for _, key := range gcKeys { | ||
| delete(c.items, key) | ||
| } | ||
| klog.V(5).Infof("gc resource update executor, current size %v", len(c.items)) | ||
| } | ||
|
|
||
| func (c *Cache) Set(key string, value interface{}, expiration time.Duration) error { | ||
| return c.set(key, value, expiration) | ||
| } | ||
|
|
||
| func (c *Cache) SetDefault(key string, value interface{}) error { | ||
| return c.set(key, value, c.defaultExpiration) | ||
| } | ||
|
|
||
| func (c *Cache) set(key string, value interface{}, expiration time.Duration) error { | ||
| if !c.gcStarted { | ||
| return fmt.Errorf("cache GC is not started yet") | ||
| } | ||
| item := item{ | ||
| object: value, | ||
| expirationTime: time.Now().Add(expiration), | ||
| } | ||
| c.mu.Lock() | ||
| defer c.mu.Unlock() | ||
| c.items[key] = item | ||
| return nil | ||
| } | ||
|
|
||
| func (c *Cache) Get(key string) (interface{}, bool) { | ||
| c.mu.Lock() | ||
| defer c.mu.Unlock() | ||
| item, ok := c.items[key] | ||
| if !ok { | ||
| return nil, false | ||
| } | ||
| if item.expirationTime.Before(time.Now()) { | ||
| return nil, false | ||
| } | ||
| return item.object, true | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,114 @@ | ||
| /* | ||
| Copyright 2022 The Koordinator 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 cache | ||
|
|
||
| import ( | ||
| "testing" | ||
| "time" | ||
|
|
||
| "github.com/stretchr/testify/assert" | ||
| ) | ||
|
|
||
| func Test_Cache_Get(t *testing.T) { | ||
| cache := NewCacheDefault() | ||
| cache.gcStarted = true | ||
| cache.items = map[string]item{ | ||
| "keyExpire": {object: "value1", expirationTime: time.Now().Add(-1 * time.Minute)}, | ||
| "keyNotExpire": {object: "value2", expirationTime: time.Now().Add(1 * time.Minute)}, | ||
| } | ||
| value, found := cache.Get("keyExpire") | ||
| assert.True(t, !found, "value not found", "keyExpire") | ||
| assert.Nil(t, value, "value must be nil", "keyExpire") | ||
|
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| value, found = cache.Get("keyNotExpire") | ||
| assert.True(t, found, "value found", "keyNotExpire") | ||
| assert.Equal(t, "value2", value, "keyNotExpire") | ||
| } | ||
|
|
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| func Test_Cache_Set(t *testing.T) { | ||
| cache := NewCacheDefault() | ||
| cache.gcStarted = true | ||
| value, found := cache.Get("key") | ||
| assert.True(t, !found, "value not found") | ||
| assert.Nil(t, value, "value must be nil") | ||
|
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| _ = cache.SetDefault("key", "value") | ||
| value, found = cache.Get("key") | ||
| assert.True(t, found, "value found", "checkSetDefault") | ||
| assert.Equal(t, "value", value, "checkSetDefault") | ||
|
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| _ = cache.Set("key", "value", -1*time.Minute) | ||
| value, found = cache.Get("key") | ||
| assert.True(t, !found, "value not found", "checkSet") | ||
| assert.Nil(t, value, "value must be nil", "checkSet") | ||
|
|
||
| } | ||
|
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| func Test_gcExpiredCache(t *testing.T) { | ||
| tests := []struct { | ||
| name string | ||
| initItems map[string]item | ||
| cache *Cache | ||
| expectItemsAfterGC map[string]item | ||
| }{ | ||
| { | ||
| name: "test_gcExpiredCache_NewCacheDefault", | ||
| initItems: map[string]item{ | ||
| "keyNeedExpire": {object: "value1", expirationTime: time.Now().Add(-1 * time.Minute)}, | ||
| "keyNotExpire": {object: "value2", expirationTime: time.Now().Add(time.Minute)}, | ||
| }, | ||
| cache: NewCacheDefault(), | ||
| expectItemsAfterGC: map[string]item{ | ||
| "keyNotExpire": {object: "value2", expirationTime: time.Now().Add(time.Minute)}, | ||
| }, | ||
| }, | ||
| { | ||
| name: "test_gcExpiredCache_NewCache", | ||
| initItems: map[string]item{ | ||
| "keyNeedExpire": {object: "value1", expirationTime: time.Now().Add(-1 * time.Minute)}, | ||
| "keyNotExpire": {object: "value2", expirationTime: time.Now().Add(time.Minute)}, | ||
| }, | ||
| cache: NewCache(time.Minute, time.Minute), | ||
| expectItemsAfterGC: map[string]item{ | ||
| "keyNotExpire": {object: "value2", expirationTime: time.Now().Add(time.Minute)}, | ||
| }, | ||
| }, | ||
| } | ||
|
|
||
| for _, tt := range tests { | ||
| t.Run(tt.name, func(t *testing.T) { | ||
| tt.cache.items = tt.initItems | ||
| tt.cache.gcStarted = true | ||
| tt.cache.gcExpiredCache() | ||
| got := tt.cache.items | ||
| assert.Equal(t, len(tt.expectItemsAfterGC), len(got), "checkLen") | ||
| checkValueEqual(t, tt.expectItemsAfterGC, got) | ||
| }) | ||
| } | ||
| } | ||
|
|
||
| func checkValueEqual(t *testing.T, expect, got map[string]item) { | ||
| assert.Equal(t, len(expect), len(got), "checkLen") | ||
| for key, item := range expect { | ||
| gotItem, ok := got[key] | ||
| if !ok { | ||
| assert.True(t, ok, "checkFound", key) | ||
| return | ||
| } | ||
| assert.Equal(t, item.object, gotItem.object, "checkValue", key) | ||
| } | ||
| } |
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