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journal_queue.go
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journal_queue.go
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package fqueue
import (
"fmt"
"hash/crc32"
"os"
"path/filepath"
"sort"
"sync"
)
var (
MaxJournalFiles = 5
JournalFileLimit = 100 * M
)
const (
lowmask = 0x00000000ffffffff
highmask = 0xffffffff00000000
)
type JournalQueue struct {
emptyJournals []*FQueue
journalQueues []*FQueue
pushQueue *FQueue
popQueue *FQueue
seq uint32 //low 32bits in id.
newQueueEnable bool
mutex *sync.Mutex
cond *sync.Cond
running bool
journalLimit int
dirPath string
dirPathSum uint64 //use the high 32bits in id.
}
type sortJournals []*FQueue
func (sj sortJournals) Len() int { return len(sj) }
func (sj sortJournals) Less(i, j int) bool { return sj[i].Id&lowmask < sj[j].Id&lowmask }
func (sj sortJournals) Swap(i, j int) { sj[j], sj[i] = sj[i], sj[j] }
func (q *JournalQueue) emptyJournalsJob() {
var fq *FQueue
var err error
if fq, err = newFQueue(filepath.Join(q.dirPath, fmt.Sprintf("%d.jat", q.seq)), (q.dirPathSum<<32)&highmask, getAlign(q.journalLimit)); err != nil {
//should not be happend
panic(err)
}
//push empty queue
q.mutex.Lock()
q.emptyJournals = append(q.emptyJournals, fq)
q.newQueueEnable = true
q.mutex.Unlock()
//notify
q.cond.Broadcast()
}
func (q *JournalQueue) tryPrepareEmptyJournal() {
if q.newQueueEnable && len(q.emptyJournals) == 0 {
if q.pushQueue.Contents > (q.pushQueue.Limit-MetaSize)/2 {
q.newQueueEnable = false
//create a new empty file
go q.emptyJournalsJob()
}
}
}
func PrepareAllJournalFiles(p string) (err error) {
var absPath string
if absPath, err = filepath.Abs(p); err != nil {
return
}
absPath = filepath.ToSlash(absPath)
if err = dirCheck(absPath); err != nil {
return
}
dirPathCrc32 := uint64(crc32.ChecksumIEEE([]byte(absPath)))
for i := 2; i <= MaxJournalFiles; i++ {
filep := filepath.Join(absPath, fmt.Sprintf("%d.jat", i))
fsize := getAlign(JournalFileLimit)
prepareQueueFile(filep, fsize)
var file *os.File
if file, err = os.OpenFile(filep, os.O_RDWR, 0644); err != nil {
return
}
var p []byte
var m, m1 *meta
if m, m1, p, err = getMeta(file, fsize); err != nil {
return
}
m.Id = dirPathCrc32 << 32
//merge meta
*m1 = *m
copy(p, []byte(magic))
file.Close()
}
return nil
}
func (q *JournalQueue) Push(p []byte) (err error) {
var pq *FQueue
TRY:
q.mutex.Lock()
if !q.running {
return ClosedQueue
}
pq = q.pushQueue
q.tryPrepareEmptyJournal()
q.mutex.Unlock()
if err = pq.Push(p); err != nil {
if err != NoSpace {
return
}
q.mutex.Lock()
//when acquired the lock. other thread alread changed the pushQueue. so check the pushQueue with old.
if pq != q.pushQueue {
q.mutex.Unlock()
goto TRY
}
if len(q.journalQueues) >= MaxJournalFiles-3 {
q.mutex.Unlock()
return
}
//put it to journal queue.
if q.pushQueue != q.popQueue {
q.journalQueues = append(q.journalQueues, q.pushQueue)
}
for len(q.emptyJournals) == 0 {
q.cond.Wait()
}
if q.pushQueue != pq {
q.mutex.Unlock()
goto TRY
}
//pop the empty queue
q.pushQueue = q.emptyJournals[0]
q.emptyJournals = q.emptyJournals[1:]
q.pushQueue.setID(q.getQueueId())
q.seq++
q.mutex.Unlock()
goto TRY
}
return nil
}
func dirCheck(path string) (err error) {
var st os.FileInfo
if st, err = os.Stat(path); err != nil {
if os.IsNotExist(err) {
if err = os.MkdirAll(path, 0775); err != nil {
return
}
} else {
return
}
} else {
if !st.IsDir() {
err = MustBeDirectory
return
}
}
return
}
func processInvaildFile(p string) {
//remove the unknow meta file
if err := os.Remove(p); err != nil {
panic(err)
}
}
func newJournalQueue(path string) (jq *JournalQueue, err error) {
if err = dirCheck(path); err != nil {
return
}
dirPathCrc32 := uint64(crc32.ChecksumIEEE([]byte(path)))
var journalLimit int
var emptyJournals []*FQueue
var journals []*FQueue
var fq *FQueue
filepath.Walk(path, func(p string, info os.FileInfo, e error) error {
if filepath.Ext(p) != ".jat" {
return nil
}
if info.IsDir() {
return filepath.SkipDir
}
if info.Size() < MetaSize || info.Size()%MetaSize != 0 {
//not reading empty file should removed.
processInvaildFile(p)
return nil
}
var err error
var fd *os.File = nil
var readOnlyMeta *meta
if fd, err = os.OpenFile(p, os.O_RDONLY, 0664); err != nil {
return err
}
defer fd.Close()
if readOnlyMeta, err = getReadOnlyMeta(fd); err != nil {
//not reading empty file should removed.
processInvaildFile(p)
return nil
}
if readOnlyMeta.Id&highmask != dirPathCrc32<<32 {
return nil
}
if journalLimit != 0 && journalLimit != readOnlyMeta.Limit {
panic("limit is different, can't support now.")
} else {
journalLimit = readOnlyMeta.Limit
}
fq = &FQueue{
qMutex: &sync.Mutex{},
}
if err = fq.loadMeta(p, readOnlyMeta.Id); err != nil {
//don't happend.
panic(err)
}
fq.running = true
if readOnlyMeta.Id&lowmask == 0 {
emptyJournals = append(emptyJournals, fq)
} else {
journals = append(journals, fq)
}
return nil
})
q := &JournalQueue{
seq: 2,
newQueueEnable: true,
mutex: &sync.Mutex{},
}
q.cond = sync.NewCond(q.mutex)
q.dirPath = path
q.dirPathSum = dirPathCrc32
if len(journals) > 0 {
q.journalLimit = journalLimit - MetaSize
//sort by raise order
sort.Sort(sortJournals(journals))
//use the bigest id for push queue and use the lowest id for pop queue.
q.pushQueue = journals[len(journals)-1]
journals = journals[:len(journals)-1]
if len(journals) == 0 {
q.popQueue = q.pushQueue
} else {
q.popQueue = journals[0]
journals = journals[1:]
}
q.seq = uint32(q.pushQueue.Id&lowmask) + 1
} else {
q.journalLimit = JournalFileLimit
if fq, err = newFQueue(filepath.Join(path, fmt.Sprintf("%d.jat", 0x1)), (dirPathCrc32<<32)|0x1, getAlign(q.journalLimit)); err != nil {
return
}
q.pushQueue = fq
q.popQueue = fq
}
q.emptyJournals = emptyJournals
q.journalQueues = journals
q.running = true
q.tryPrepareEmptyJournal()
jq = q
return
}
func NewJournalQueue(path string) (jq *JournalQueue, err error) {
var absPath string
if absPath, err = filepath.Abs(path); err != nil {
return
}
absPath = filepath.ToSlash(absPath)
return newJournalQueue(absPath)
}
func (q *JournalQueue) getQueueId() uint64 {
return ((q.dirPathSum << 32) & highmask) | (uint64(q.seq) & lowmask)
}
func (q *JournalQueue) Close() {
q.mutex.Lock()
defer q.mutex.Unlock()
q.running = false
for !q.newQueueEnable {
q.cond.Wait()
}
if q.pushQueue != nil {
q.pushQueue.Close()
}
if q.popQueue != nil && q.popQueue != q.pushQueue {
q.popQueue.Close()
}
for _, q := range q.journalQueues {
q.Close()
}
for _, q := range q.emptyJournals {
q.Close()
}
}
func (q *JournalQueue) Pop() (sli []byte, err error) {
var pq *FQueue
TRY:
q.mutex.Lock()
if !q.running {
err = ClosedQueue
return
}
pq = q.popQueue
q.mutex.Unlock()
if sli, err = pq.Pop(); err != nil {
if err != QueueEmpty {
return
}
q.mutex.Lock()
//when acquired the lock. other thread alread changed the popQueue. so check the popQueue with old.
if pq != q.popQueue {
q.mutex.Unlock()
goto TRY
}
//if alread is same as push queue, there is no data, just return.
if len(q.journalQueues) == 0 && pq == q.pushQueue {
q.mutex.Unlock()
return
}
//release the journal File
q.popQueue.reset((q.dirPathSum << 32) & highmask)
q.emptyJournals = append(q.emptyJournals, q.popQueue)
if len(q.journalQueues) == 0 {
q.popQueue = q.pushQueue
} else {
q.popQueue = q.journalQueues[0]
q.journalQueues = q.journalQueues[1:]
}
q.mutex.Unlock()
goto TRY
}
return
}