134 lines
2.8 KiB
Go
134 lines
2.8 KiB
Go
/*
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Copyright 2016 The Fission Authors.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package cache
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import (
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"time"
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"fmt"
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"github.com/platform9/fission"
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)
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type requestType int
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const (
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GET requestType = iota
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SET
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DELETE
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)
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type (
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Value struct {
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ctime time.Time
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atime time.Time
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value interface{}
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}
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Cache struct {
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cache map[interface{}]Value
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requestChannel chan *request
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}
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request struct {
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requestType
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key interface{}
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value interface{}
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responseChannel chan *response
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}
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response struct {
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error
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value interface{}
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}
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)
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func MakeCache() *Cache {
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c := &Cache{
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cache: make(map[interface{}]Value),
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requestChannel: make(chan *request),
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}
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go c.service()
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return c
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}
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func (c *Cache) service() {
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for {
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req := <-c.requestChannel
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resp := &response{}
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switch req.requestType {
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case GET:
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val, ok := c.cache[req.key]
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if !ok {
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resp.error = fission.MakeError(fission.ErrorNotFound,
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fmt.Sprintf("key '%v' not found", req.key))
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}
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val.atime = time.Now()
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c.cache[req.key] = val
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resp.value = val.value
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req.responseChannel <- resp
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case SET:
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now := time.Now()
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c.cache[req.key] = Value{
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value: req.value,
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ctime: now,
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atime: now,
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}
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req.responseChannel <- resp
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case DELETE:
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delete(c.cache, req.key)
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req.responseChannel <- resp
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default:
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resp.error = fission.MakeError(fission.ErrorInvalidArgument,
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fmt.Sprintf("invalid request type: %v", req.requestType))
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req.responseChannel <- resp
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}
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}
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}
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func (c *Cache) Get(key interface{}) (interface{}, error) {
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respChannel := make(chan *response)
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c.requestChannel <- &request{
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requestType: GET,
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key: key,
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responseChannel: respChannel,
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}
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resp := <-respChannel
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return resp.value, resp.error
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}
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func (c *Cache) Set(key interface{}, value interface{}) error {
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respChannel := make(chan *response)
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c.requestChannel <- &request{
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requestType: SET,
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key: key,
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value: value,
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responseChannel: respChannel,
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}
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resp := <-respChannel
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return resp.error
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}
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func (c *Cache) Delete(key interface{}) error {
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respChannel := make(chan *response)
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c.requestChannel <- &request{
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requestType: DELETE,
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key: key,
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responseChannel: respChannel,
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}
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resp := <-respChannel
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return resp.error
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}
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