github.com/matrixorigin/matrixone@v0.7.0/pkg/vm/engine/tae/catalog/processor.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  // XXX this API is broken.  In case of inplementing a cursor like interface
    18  // we cannot use error.  moerr is a very heavy mechanism.
    19  //
    20  // Return a int code.
    21  type Processor interface {
    22  	OnDatabase(database *DBEntry) error
    23  	OnTable(table *TableEntry) error
    24  	OnPostSegment(segment *SegmentEntry) error
    25  	OnSegment(segment *SegmentEntry) error
    26  	OnBlock(block *BlockEntry) error
    27  }
    28  
    29  type LoopProcessor struct {
    30  	DatabaseFn    func(*DBEntry) error
    31  	TableFn       func(*TableEntry) error
    32  	SegmentFn     func(*SegmentEntry) error
    33  	BlockFn       func(*BlockEntry) error
    34  	PostSegmentFn func(*SegmentEntry) error
    35  }
    36  
    37  func (p *LoopProcessor) OnDatabase(database *DBEntry) error {
    38  	if p.DatabaseFn != nil {
    39  		return p.DatabaseFn(database)
    40  	}
    41  	return nil
    42  }
    43  
    44  func (p *LoopProcessor) OnTable(table *TableEntry) error {
    45  	if p.TableFn != nil {
    46  		return p.TableFn(table)
    47  	}
    48  	return nil
    49  }
    50  
    51  func (p *LoopProcessor) OnPostSegment(segment *SegmentEntry) error {
    52  	if p.PostSegmentFn != nil {
    53  		return p.PostSegmentFn(segment)
    54  	}
    55  	return nil
    56  }
    57  
    58  func (p *LoopProcessor) OnSegment(segment *SegmentEntry) error {
    59  	if p.SegmentFn != nil {
    60  		return p.SegmentFn(segment)
    61  	}
    62  	return nil
    63  }
    64  
    65  func (p *LoopProcessor) OnBlock(block *BlockEntry) error {
    66  	if p.BlockFn != nil {
    67  		return p.BlockFn(block)
    68  	}
    69  	return nil
    70  }