github.com/matrixorigin/matrixone@v1.2.0/pkg/objectio/name.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 objectio
    16  
    17  import (
    18  	"bytes"
    19  	"fmt"
    20  	"math/rand"
    21  	"unsafe"
    22  
    23  	"github.com/matrixorigin/matrixone/pkg/container/types"
    24  )
    25  
    26  /*
    27  	 ObjectName is a fixed-length unmodifiable byte array.
    28  	 Layout: SegmentId     |   Num    |  NameStr
    29  		     (types.Uuid)    (uint16)   (string)
    30  	 Size:	   16B         +   2B     +  42B
    31  */
    32  type ObjectName []byte
    33  type ObjectNameShort [ObjectNameShortLen]byte
    34  
    35  func BuildObjectName(segid *Segmentid, num uint16) ObjectName {
    36  	var name [ObjectNameLen]byte
    37  	copy(name[:SegmentIdSize], types.EncodeUuid(segid))
    38  	copy(name[FileNumOff:FileNumOff+FileNumLen], types.EncodeUint16(&num))
    39  	str := fmt.Sprintf("%v_%05d", segid.ToString(), num)
    40  	copy(name[NameStringOff:NameStringOff+NameStringLen], str)
    41  	return unsafe.Slice((*byte)(unsafe.Pointer(&name)), ObjectNameLen)
    42  }
    43  
    44  func BuildObjectNameWithObjectID(segid *ObjectId) ObjectName {
    45  	var name [ObjectNameLen]byte
    46  	copy(name[:ObjectIDSize], segid[:])
    47  	str := fmt.Sprintf("%v_%05d", segid.Segment().ToString(), segid.Offset())
    48  	copy(name[NameStringOff:NameStringOff+NameStringLen], str)
    49  	return unsafe.Slice((*byte)(unsafe.Pointer(&name)), ObjectNameLen)
    50  }
    51  
    52  func (s *ObjectNameShort) Segmentid() *Segmentid {
    53  	return (*Segmentid)(unsafe.Pointer(&s[0]))
    54  }
    55  
    56  func (s *ObjectNameShort) Num() uint16 {
    57  	return types.DecodeUint16(s[SegmentIdSize:])
    58  }
    59  
    60  func (s *ObjectNameShort) Equal(o []byte) bool {
    61  	return bytes.Equal(s[:], o)
    62  }
    63  
    64  func (o ObjectName) String() string {
    65  	return string(o[NameStringOff : NameStringOff+NameStringLen])
    66  }
    67  
    68  func (o ObjectName) Short() *ObjectNameShort {
    69  	return (*ObjectNameShort)(unsafe.Pointer(&o[0]))
    70  }
    71  
    72  func (o ObjectName) SegmentId() Segmentid {
    73  	return types.DecodeUuid(o[:SegmentIdSize])
    74  }
    75  
    76  func (o ObjectName) ObjectId() *ObjectId {
    77  	return (*ObjectId)(unsafe.Pointer(&o[0]))
    78  }
    79  
    80  func (o ObjectName) Num() uint16 {
    81  	return types.DecodeUint16(o[FileNumOff : FileNumOff+FileNumLen])
    82  }
    83  
    84  func ShortName(b *Blockid) *ObjectNameShort {
    85  	return (*ObjectNameShort)(unsafe.Pointer(&b[0]))
    86  }
    87  
    88  func MockObjectName() ObjectName {
    89  	return BuildObjectName(NewSegmentid(), uint16(rand.Intn(1000)))
    90  }
    91  
    92  func MockLocation(name ObjectName) Location {
    93  	extent := NewExtent(0, uint32(rand.Intn(10000)), uint32(rand.Intn(10000)), uint32(rand.Intn(10000)))
    94  	return BuildLocation(name, extent, uint32(rand.Intn(8192)), uint16(rand.Intn(300)))
    95  }
    96  
    97  func (o ObjectName) Equal(a ObjectName) bool {
    98  	return bytes.Equal(o, a)
    99  }
   100  
   101  var NameQueryResult [NameStringOff]byte
   102  var NameCheckPoint [NameStringOff]byte
   103  var NameDiskCleaner [NameStringOff]byte
   104  var NameETL [NameStringOff]byte
   105  var NameNormal [NameStringOff]byte
   106  
   107  func init() {
   108  	copy(NameQueryResult[:], "Query_ResultXXXX")
   109  	copy(NameCheckPoint[:], "CheckPoint_MetaX")
   110  	copy(NameDiskCleaner[:], "Disk_CleanerXXXX")
   111  	copy(NameETL[:], "Writer_ETLXXXXXX")
   112  	copy(NameNormal[:], "Writer_NormalXXX")
   113  }
   114  
   115  func BuildQueryResultName() ObjectName {
   116  	return NameQueryResult[:]
   117  }
   118  
   119  func BuildCheckpointName() ObjectName {
   120  	return NameCheckPoint[:]
   121  }
   122  
   123  func BuildDiskCleanerName() ObjectName {
   124  	return NameDiskCleaner[:]
   125  }
   126  
   127  func BuildETLName() ObjectName {
   128  	return NameETL[:]
   129  }
   130  
   131  func BuildNormalName() ObjectName {
   132  	return NameNormal[:]
   133  }