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/*
* Copyright 2015 Manish R Jain <manishrjain@gmail.com>
*
* 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 posting
import (
"math/rand"
"sync"
"sync/atomic"
"time"
"github.com/Sirupsen/logrus"
)
const NBUCKETS = 32
type latency struct {
n1 uint64
u1 uint64
u10 uint64
u100 uint64
m1 uint64
s1 uint64
}
type bucket struct {
sync.RWMutex
m map[uint64]*List
lat *latency
}
func (l *latency) update(s time.Time) {
e := time.Now().Sub(s)
micros := e.Nanoseconds() / 1000
if micros > 1000000 {
atomic.AddUint64(&l.s1, 1)
} else if micros > 1000 {
atomic.AddUint64(&l.m1, 1)
} else if micros > 100 {
atomic.AddUint64(&l.u100, 1)
} else if micros > 10 {
atomic.AddUint64(&l.u10, 1)
} else if micros > 1 {
atomic.AddUint64(&l.u1, 1)
} else {
atomic.AddUint64(&l.n1, 1)
}
}
func (l *latency) log() {
for _ = range time.Tick(5 * time.Second) {
glog.WithFields(logrus.Fields{
"n1": atomic.LoadUint64(&l.n1),
"u1": atomic.LoadUint64(&l.u1),
"u10": atomic.LoadUint64(&l.u10),
"u100": atomic.LoadUint64(&l.u100),
"m1": atomic.LoadUint64(&l.m1),
"s1": atomic.LoadUint64(&l.s1),
}).Info("Lmap latency")
}
}
func (b *bucket) get(key uint64) (*List, bool) {
if b.lat != nil {
n := time.Now()
defer b.lat.update(n)
}
b.RLock()
if l, ok := b.m[key]; ok {
b.RUnlock()
return l, false
}
b.RUnlock()
b.Lock()
defer b.Unlock()
if l, ok := b.m[key]; ok {
return l, false
}
l := NewList()
b.m[key] = l
return l, true
}
type Map struct {
buckets []*bucket
}
func NewMap(withLog bool) *Map {
var lat *latency
if withLog {
lat = new(latency)
go lat.log()
} else {
lat = nil
}
m := new(Map)
m.buckets = make([]*bucket, NBUCKETS)
for i := 0; i < NBUCKETS; i++ {
m.buckets[i] = new(bucket)
m.buckets[i].lat = lat
m.buckets[i].m = make(map[uint64]*List)
}
return m
}
func (m *Map) Get(key uint64) (*List, bool) {
bi := key % NBUCKETS
return m.buckets[bi].get(key)
}
func (m *Map) StreamUntilCap(ch chan uint64) {
bi := rand.Intn(NBUCKETS)
b := m.buckets[bi]
b.RLock()
defer b.RUnlock()
for u := range b.m {
if len(ch) >= cap(ch) {
break
}
ch <- u
}
}
func (m *Map) StreamAllKeys(ch chan uint64) {
for i := 0; i < len(m.buckets); i++ {
b := m.buckets[i]
b.RLock()
for u := range b.m {
ch <- u
}
b.RUnlock()
}
}