github.com/zuoyebang/bitalosdb@v1.1.1-0.20240516111551-79a8c4d8ce20/internal/arenaskl/flush_iterator.go (about)

     1  // Copyright 2021 The Bitalosdb author(hustxrb@163.com) and other contributors.
     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 arenaskl
    16  
    17  import "github.com/zuoyebang/bitalosdb/internal/base"
    18  
    19  type flushIterator struct {
    20  	Iterator
    21  	bytesIterated *uint64
    22  }
    23  
    24  var _ base.InternalIterator = (*flushIterator)(nil)
    25  
    26  func (it *flushIterator) String() string {
    27  	return "memtable"
    28  }
    29  
    30  func (it *flushIterator) SeekGE(key []byte) (*base.InternalKey, []byte) {
    31  	panic("bitalosdb: SeekGE unimplemented")
    32  }
    33  
    34  func (it *flushIterator) SeekPrefixGE(
    35  	prefix, key []byte, trySeekUsingNext bool,
    36  ) (*base.InternalKey, []byte) {
    37  	panic("bitalosdb: SeekPrefixGE unimplemented")
    38  }
    39  
    40  func (it *flushIterator) SeekLT(key []byte) (*base.InternalKey, []byte) {
    41  	panic("bitalosdb: SeekLT unimplemented")
    42  }
    43  
    44  func (it *flushIterator) First() (*base.InternalKey, []byte) {
    45  	key, val := it.Iterator.First()
    46  	if key == nil {
    47  		return nil, nil
    48  	}
    49  	*it.bytesIterated += uint64(it.nd.allocSize)
    50  	return key, val
    51  }
    52  
    53  func (it *flushIterator) Next() (*base.InternalKey, []byte) {
    54  	it.nd = it.list.getSkipNext(it.nd)
    55  	if it.nd == it.list.tail {
    56  		return nil, nil
    57  	}
    58  	it.decodeKey()
    59  	*it.bytesIterated += uint64(it.nd.allocSize)
    60  	return &it.key, it.value()
    61  }
    62  
    63  func (it *flushIterator) Prev() (*base.InternalKey, []byte) {
    64  	panic("bitalosdb: Prev unimplemented")
    65  }