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cache.go
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cache.go
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// Copyright 2019 Google LLC All Rights Reserved.
//
// 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 gameserverallocations
import (
"sync"
agonesv1 "agones.dev/agones/pkg/apis/agones/v1"
)
// gameserver cache to keep the Ready state gameserver.
type gameServerCacheEntry struct {
mu sync.RWMutex
cache map[string]*agonesv1.GameServer
}
// Store saves the data in the cache.
func (e *gameServerCacheEntry) Store(key string, gs *agonesv1.GameServer) {
e.mu.Lock()
defer e.mu.Unlock()
if e.cache == nil {
e.cache = map[string]*agonesv1.GameServer{}
}
e.cache[key] = gs.DeepCopy()
}
// Delete deletes the data. If it exists returns true.
func (e *gameServerCacheEntry) Delete(key string) bool {
e.mu.Lock()
defer e.mu.Unlock()
ret := false
if e.cache != nil {
if _, ok := e.cache[key]; ok {
delete(e.cache, key)
ret = true
}
}
return ret
}
// Load returns the data from cache. It return true if the value exists in the cache
func (e *gameServerCacheEntry) Load(key string) (*agonesv1.GameServer, bool) {
e.mu.RLock()
defer e.mu.RUnlock()
val, ok := e.cache[key]
return val, ok
}
// Range extracts data from the cache based on provided function f.
func (e *gameServerCacheEntry) Range(f func(key string, gs *agonesv1.GameServer) bool) {
e.mu.RLock()
defer e.mu.RUnlock()
for k, v := range e.cache {
if !f(k, v) {
break
}
}
}
// Len returns the current length of the cache
func (e *gameServerCacheEntry) Len() int {
e.mu.RLock()
defer e.mu.RUnlock()
return len(e.cache)
}