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// Copyright 2015 go-swagger maintainers
//
// 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 spec
import (
"sync"
)
// ResolutionCache a cache for resolving urls
type ResolutionCache interface {
Get(string) (interface{}, bool)
Set(string, interface{})
}
type simpleCache struct {
lock sync.RWMutex
store map[string]interface{}
}
func (s *simpleCache) ShallowClone() ResolutionCache {
store := make(map[string]interface{}, len(s.store))
s.lock.RLock()
for k, v := range s.store {
store[k] = v
}
s.lock.RUnlock()
return &simpleCache{
store: store,
}
}
// Get retrieves a cached URI
func (s *simpleCache) Get(uri string) (interface{}, bool) {
s.lock.RLock()
v, ok := s.store[uri]
s.lock.RUnlock()
return v, ok
}
// Set caches a URI
func (s *simpleCache) Set(uri string, data interface{}) {
s.lock.Lock()
s.store[uri] = data
s.lock.Unlock()
}
var (
// resCache is a package level cache for $ref resolution and expansion.
// It is initialized lazily by methods that have the need for it: no
// memory is allocated unless some expander methods are called.
//
// It is initialized with JSON schema and swagger schema,
// which do not mutate during normal operations.
//
// All subsequent utilizations of this cache are produced from a shallow
// clone of this initial version.
resCache *simpleCache
onceCache sync.Once
_ ResolutionCache = &simpleCache{}
)
// initResolutionCache initializes the URI resolution cache. To be wrapped in a sync.Once.Do call.
func initResolutionCache() {
resCache = defaultResolutionCache()
}
func defaultResolutionCache() *simpleCache {
return &simpleCache{store: map[string]interface{}{
"http://swagger.io/v2/schema.json": MustLoadSwagger20Schema(),
"http://json-schema.org/draft-04/schema": MustLoadJSONSchemaDraft04(),
}}
}
func cacheOrDefault(cache ResolutionCache) ResolutionCache {
onceCache.Do(initResolutionCache)
if cache != nil {
return cache
}
// get a shallow clone of the base cache with swagger and json schema
return resCache.ShallowClone()
}
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