github.com/braveheart12/just@v0.8.7/ledger/storage/pulsestorage.go (about) 1 /* 2 * Copyright 2019 Insolar Technologies 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 package storage 18 19 import ( 20 "context" 21 "sync" 22 23 "github.com/insolar/insolar/core" 24 ) 25 26 // PulseStorage implements core.PulseStorage 27 type PulseStorage struct { 28 PulseTracker PulseTracker `inject:""` 29 rwLock sync.RWMutex 30 currentPulse *core.Pulse 31 } 32 33 // NewPulseStorage creates new pulse storage 34 func NewPulseStorage() *PulseStorage { 35 return &PulseStorage{} 36 } 37 38 // Current returns current pulse of the system 39 func (ps *PulseStorage) Current(ctx context.Context) (*core.Pulse, error) { 40 ps.rwLock.RLock() 41 42 if ps.currentPulse == nil { 43 ps.rwLock.RUnlock() 44 45 ps.rwLock.Lock() 46 defer ps.rwLock.Unlock() 47 48 if ps.currentPulse == nil { 49 currentPulse, err := ps.PulseTracker.GetLatestPulse(ctx) 50 if err != nil { 51 return nil, err 52 } 53 ps.currentPulse = ¤tPulse.Pulse 54 } 55 56 return ps.currentPulse, nil 57 } 58 59 defer ps.rwLock.RUnlock() 60 return ps.currentPulse, nil 61 } 62 63 func (ps *PulseStorage) Set(pulse *core.Pulse) { 64 ps.currentPulse = pulse 65 } 66 67 // Lock takes lock on parent's pulse storage 68 func (ps *PulseStorage) Lock() { 69 ps.rwLock.Lock() 70 } 71 72 // Unlock takes unlock on parent's pulse storage 73 func (ps *PulseStorage) Unlock() { 74 ps.rwLock.Unlock() 75 }