github.com/matrixorigin/matrixone@v1.2.0/pkg/vm/engine/tae/model/pages.go (about)

     1  // Copyright 2021 Matrix Origin
     2  //
     3  // Licensed under the Apache License, Version 2.0 (the "License");
     4  // you may not use this file except in compliance with the License.
     5  // You may obtain a copy of the License at
     6  //
     7  //      http://www.apache.org/licenses/LICENSE-2.0
     8  //
     9  // Unless required by applicable law or agreed to in writing, software
    10  // distributed under the License is distributed on an "AS IS" BASIS,
    11  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    12  // See the License for the specific language governing permissions and
    13  // limitations under the License.
    14  
    15  package model
    16  
    17  import (
    18  	"bytes"
    19  	"fmt"
    20  	"time"
    21  
    22  	"github.com/matrixorigin/matrixone/pkg/container/types"
    23  	"github.com/matrixorigin/matrixone/pkg/logutil"
    24  	"github.com/matrixorigin/matrixone/pkg/vm/engine/tae/common"
    25  )
    26  
    27  type HashPageTable = TransferTable[*TransferHashPage]
    28  
    29  type TransferHashPage struct {
    30  	common.RefHelper
    31  	bornTS      time.Time
    32  	id          *common.ID // not include blk offset
    33  	hashmap     map[uint32]types.Rowid
    34  	isTransient bool
    35  }
    36  
    37  func NewTransferHashPage(id *common.ID, ts time.Time, isTransient bool) *TransferHashPage {
    38  	page := &TransferHashPage{
    39  		bornTS:      ts,
    40  		id:          id,
    41  		hashmap:     make(map[uint32]types.Rowid),
    42  		isTransient: isTransient,
    43  	}
    44  	page.OnZeroCB = page.Close
    45  	return page
    46  }
    47  
    48  func (page *TransferHashPage) ID() *common.ID    { return page.id }
    49  func (page *TransferHashPage) BornTS() time.Time { return page.bornTS }
    50  
    51  func (page *TransferHashPage) TTL(now time.Time, ttl time.Duration) bool {
    52  	if page.isTransient {
    53  		ttl /= 2
    54  	}
    55  	return now.After(page.bornTS.Add(ttl))
    56  }
    57  
    58  func (page *TransferHashPage) Close() {
    59  	logutil.Debugf("Closing %s", page.String())
    60  	page.hashmap = make(map[uint32]types.Rowid)
    61  }
    62  
    63  func (page *TransferHashPage) Length() int {
    64  	return len(page.hashmap)
    65  }
    66  
    67  func (page *TransferHashPage) String() string {
    68  	var w bytes.Buffer
    69  	_, _ = w.WriteString(fmt.Sprintf("hashpage[%s][%s][Len=%d]",
    70  		page.id.BlockString(),
    71  		page.bornTS.String(),
    72  		len(page.hashmap)))
    73  	return w.String()
    74  }
    75  
    76  func (page *TransferHashPage) Pin() *common.PinnedItem[*TransferHashPage] {
    77  	page.Ref()
    78  	return &common.PinnedItem[*TransferHashPage]{
    79  		Val: page,
    80  	}
    81  }
    82  
    83  func (page *TransferHashPage) Train(from uint32, to types.Rowid) {
    84  	page.hashmap[from] = to
    85  }
    86  
    87  func (page *TransferHashPage) Transfer(from uint32) (dest types.Rowid, ok bool) {
    88  	dest, ok = page.hashmap[from]
    89  	return
    90  }