github.com/matrixorigin/matrixone@v1.2.0/pkg/vm/engine/disttae/cache/table_guard.go (about)

     1  // Copyright 2021 - 2023 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 cache
    16  
    17  import (
    18  	"sync"
    19  
    20  	"github.com/matrixorigin/matrixone/pkg/pb/timestamp"
    21  )
    22  
    23  // tableGuard helps to track the version of table. It is global unique and is
    24  // kept in CatalogCache, which is kept in disttae.Engine.
    25  type tableGuard struct {
    26  	mu struct {
    27  		sync.RWMutex
    28  		schema_version map[TableKey]*TableVersion
    29  	}
    30  }
    31  
    32  // newTableGuard creates a new tableGuard instance.
    33  func newTableGuard() *tableGuard {
    34  	t := &tableGuard{}
    35  	t.mu.schema_version = make(map[TableKey]*TableVersion)
    36  	return t
    37  }
    38  
    39  // setSchemaVersion
    40  func (g *tableGuard) setSchemaVersion(name TableKey, val *TableVersion) {
    41  	g.mu.Lock()
    42  	defer g.mu.Unlock()
    43  	g.mu.schema_version[name] = val
    44  }
    45  
    46  // getSchemaVersion
    47  func (g *tableGuard) getSchemaVersion(name TableKey) *TableVersion {
    48  	g.mu.Lock()
    49  	defer g.mu.Unlock()
    50  	return g.mu.schema_version[name]
    51  }
    52  
    53  // GC do the garbage collection job for tableGuard
    54  func (g *tableGuard) GC(ts timestamp.Timestamp) {
    55  	g.mu.Lock()
    56  	defer g.mu.Unlock()
    57  	g.mu.schema_version = make(map[TableKey]*TableVersion)
    58  }