github.com/matrixorigin/matrixone@v0.7.0/pkg/vm/engine/tae/catalog/basemvccnode.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 catalog
    16  
    17  import (
    18  	"encoding/binary"
    19  	"fmt"
    20  	"io"
    21  
    22  	"github.com/matrixorigin/matrixone/pkg/container/types"
    23  	"github.com/matrixorigin/matrixone/pkg/vm/engine/tae/iface/txnif"
    24  )
    25  
    26  type EntryMVCCNode struct {
    27  	CreatedAt, DeletedAt types.TS
    28  }
    29  
    30  // Dropped committed
    31  func (un *EntryMVCCNode) HasDropCommitted() bool {
    32  	return !un.DeletedAt.IsEmpty() && un.DeletedAt != txnif.UncommitTS
    33  }
    34  
    35  // Dropped committed or uncommitted
    36  func (un *EntryMVCCNode) HasDropIntent() bool {
    37  	return !un.DeletedAt.IsEmpty()
    38  }
    39  
    40  func (un *EntryMVCCNode) GetCreatedAt() types.TS {
    41  	return un.CreatedAt
    42  }
    43  
    44  func (un *EntryMVCCNode) GetDeletedAt() types.TS {
    45  	return un.DeletedAt
    46  }
    47  
    48  func (un *EntryMVCCNode) IsCreating() bool {
    49  	return un.CreatedAt.Equal(txnif.UncommitTS)
    50  }
    51  
    52  func (un *EntryMVCCNode) Clone() *EntryMVCCNode {
    53  	return &EntryMVCCNode{
    54  		CreatedAt: un.CreatedAt,
    55  		DeletedAt: un.DeletedAt,
    56  	}
    57  }
    58  
    59  func (un *EntryMVCCNode) CloneData() *EntryMVCCNode {
    60  	return &EntryMVCCNode{
    61  		CreatedAt: un.CreatedAt,
    62  		DeletedAt: un.DeletedAt,
    63  	}
    64  }
    65  
    66  func (un *EntryMVCCNode) Delete() {
    67  	un.DeletedAt = txnif.UncommitTS
    68  }
    69  
    70  func (un *EntryMVCCNode) ReadFrom(r io.Reader) (n int64, err error) {
    71  	if err = binary.Read(r, binary.BigEndian, &un.CreatedAt); err != nil {
    72  		return
    73  	}
    74  	n += 12
    75  	if err = binary.Read(r, binary.BigEndian, &un.DeletedAt); err != nil {
    76  		return
    77  	}
    78  	n += 12
    79  	return
    80  }
    81  func (un *EntryMVCCNode) WriteTo(w io.Writer) (n int64, err error) {
    82  	if err = binary.Write(w, binary.BigEndian, un.CreatedAt); err != nil {
    83  		return
    84  	}
    85  	n += 12
    86  	if err = binary.Write(w, binary.BigEndian, un.DeletedAt); err != nil {
    87  		return
    88  	}
    89  	n += 12
    90  	return
    91  }
    92  func (un *EntryMVCCNode) PrepareCommit() (err error) {
    93  	return nil
    94  }
    95  func (un *EntryMVCCNode) String() string {
    96  	return fmt.Sprintf("[C@%s,D@%s]", un.CreatedAt.ToString(), un.DeletedAt.ToString())
    97  }
    98  func (un *EntryMVCCNode) ApplyCommit(ts types.TS) (err error) {
    99  	if un.CreatedAt == txnif.UncommitTS {
   100  		un.CreatedAt = ts
   101  	}
   102  	if un.DeletedAt == txnif.UncommitTS {
   103  		un.DeletedAt = ts
   104  	}
   105  	return nil
   106  }