| /* |
| * Licensed to the Apache Software Foundation (ASF) under one or more |
| * contributor license agreements. See the NOTICE file distributed with |
| * this work for additional information regarding copyright ownership. |
| * The ASF licenses this file to You 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 schema |
| |
| import ( |
| "fmt" |
| "github.com/go-chassis/openlog" |
| "strings" |
| "sync" |
| "time" |
| |
| "github.com/go-chassis/go-chassis/v2/core/registry" |
| "github.com/patrickmn/go-cache" |
| ) |
| |
| var ( |
| svcToInterfaceCache *cache.Cache |
| protoCache *cache.Cache |
| //DefaultInterval is default refresh interval time |
| DefaultInterval = 30 * time.Second |
| //DefaultExpireTime is default expire time |
| DefaultExpireTime = 0 * time.Second |
| |
| refresher *refreshTicker |
| ) |
| |
| func init() { |
| svcToInterfaceCache = cache.New(DefaultExpireTime, 0) |
| protoCache = cache.New(DefaultExpireTime, 0) |
| |
| refresher = newRefresher(DefaultInterval) |
| refresher.Run() |
| } |
| |
| func newInterfaceJob(interfaceName string) Job { |
| return Job{Fn: func() { |
| svc := registry.DefaultContractDiscoveryService.GetMicroServicesByInterface(interfaceName) |
| if svc != nil { |
| svcKey := strings.Join([]string{svc[0].ServiceName, svc[0].Version, svc[0].AppID}, "/") |
| openlog.Info(fmt.Sprintf("refresh cache svc [%s] for interface %s", svcKey, interfaceName)) |
| svcToInterfaceCache.Set(interfaceName, svc[0], 0) |
| } |
| }} |
| } |
| |
| func newRefresher(t time.Duration) *refreshTicker { |
| return &refreshTicker{ |
| jobs: Queue{ |
| tick: t, |
| cond: sync.NewCond(&sync.Mutex{}), |
| q: make([]Job, 0)}, |
| } |
| } |
| |
| type refreshTicker struct { |
| jobs Queue |
| } |
| |
| //Queue is a struct |
| type Queue struct { |
| tick time.Duration |
| cond *sync.Cond |
| q []Job |
| } |
| |
| //Job is a struct |
| type Job struct { |
| Fn JobFunc |
| Next time.Time |
| } |
| |
| //JobFunc is a type of func() |
| type JobFunc func() |
| |
| func (tc *refreshTicker) Add(job Job) { tc.jobs.Push(job) } |
| func (tc *refreshTicker) Run() { go tc.run() } |
| |
| func (tc *refreshTicker) run() { |
| var timer *time.Timer |
| var top Job |
| for { |
| top = tc.jobs.Top() |
| timer = time.NewTimer(top.Next.Sub(time.Now())) |
| //TODO: if top is earlier than now |
| select { |
| case <-timer.C: |
| top = tc.jobs.Pop() |
| go top.Fn() |
| tc.jobs.Push(top) |
| } |
| } |
| } |
| |
| //Push is a method to add new job |
| func (q *Queue) Push(x Job) { |
| q.cond.L.Lock() |
| defer q.cond.L.Unlock() |
| x.Next = time.Now().Add(q.tick) |
| q.q = append(q.q, x) |
| q.cond.Signal() |
| } |
| |
| //Top is a method to get then latest job |
| func (q *Queue) Top() Job { |
| q.cond.L.Lock() |
| defer q.cond.L.Unlock() |
| for len(q.q) == 0 { |
| q.cond.Wait() |
| } |
| |
| return q.q[0] |
| } |
| |
| //Pop is a method to get next job |
| func (q *Queue) Pop() Job { |
| q.cond.L.Lock() |
| defer q.cond.L.Unlock() |
| for len(q.q) == 0 { |
| q.cond.Wait() |
| } |
| |
| x := q.q[0] |
| q.q = q.q[1:] |
| return x |
| } |