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client_cache.go
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package common
import (
"sync"
)
type (
// ClientCache store initialized clients
ClientCache interface {
GetClientForKey(key string) (interface{}, error)
GetClientForClientKey(clientKey string) (interface{}, error)
GetAllClients() ([]interface{}, error)
}
keyResolver interface {
Lookup(key string) (string, error)
GetAllAddresses() ([]string, error)
}
clientProvider func(string) (interface{}, error)
clientCacheImpl struct {
keyResolver keyResolver
clientProvider clientProvider
cacheLock sync.RWMutex
clients map[string]interface{}
}
)
// NewClientCache creates a new client cache based on membership
func NewClientCache(
keyResolver keyResolver,
clientProvider clientProvider,
) ClientCache {
return &clientCacheImpl{
keyResolver: keyResolver,
clientProvider: clientProvider,
clients: make(map[string]interface{}),
}
}
func (c *clientCacheImpl) GetClientForKey(key string) (interface{}, error) {
clientKey, err := c.keyResolver.Lookup(key)
if err != nil {
return nil, err
}
return c.GetClientForClientKey(clientKey)
}
func (c *clientCacheImpl) GetClientForClientKey(clientKey string) (interface{}, error) {
c.cacheLock.RLock()
client, ok := c.clients[clientKey]
c.cacheLock.RUnlock()
if ok {
return client, nil
}
c.cacheLock.Lock()
defer c.cacheLock.Unlock()
client, ok = c.clients[clientKey]
if ok {
return client, nil
}
client, err := c.clientProvider(clientKey)
if err != nil {
return nil, err
}
c.clients[clientKey] = client
return client, nil
}
func (c *clientCacheImpl) GetAllClients() ([]interface{}, error) {
var result []interface{}
allAddresses, err := c.keyResolver.GetAllAddresses()
if err != nil {
return nil, err
}
for _, addr := range allAddresses {
client, err := c.GetClientForClientKey(addr)
if err != nil {
return nil, err
}
result = append(result, client)
}
return result, nil
}