github.com/matrixorigin/matrixone@v1.2.0/pkg/fileservice/policy.go (about)

     1  // Copyright 2022 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 fileservice
    16  
    17  type Policy uint64
    18  
    19  const (
    20  	SkipMemoryCacheReads = 1 << iota
    21  	SkipMemoryCacheWrites
    22  	SkipDiskCacheReads
    23  	SkipDiskCacheWrites
    24  	SkipFullFilePreloads
    25  )
    26  
    27  const (
    28  	SkipCacheReads  = SkipMemoryCacheReads | SkipDiskCacheReads
    29  	SkipCacheWrites = SkipMemoryCacheWrites | SkipDiskCacheWrites
    30  	SkipDiskCache   = SkipDiskCacheReads | SkipDiskCacheWrites
    31  	SkipMemoryCache = SkipMemoryCacheReads | SkipMemoryCacheWrites
    32  	SkipAllCache    = SkipDiskCache | SkipMemoryCache
    33  )
    34  
    35  func (c Policy) Any(policies ...Policy) bool {
    36  	for _, policy := range policies {
    37  		if policy&c > 0 {
    38  			return true
    39  		}
    40  	}
    41  	return false
    42  }
    43  
    44  func (c Policy) CacheIOEntry() bool {
    45  	// cache IOEntry if not caching full file
    46  	return c.Any(SkipFullFilePreloads)
    47  }
    48  
    49  func (c Policy) CacheFullFile() bool {
    50  	return !c.Any(SkipFullFilePreloads)
    51  }