github.com/matrixorigin/matrixone@v1.2.0/pkg/fileservice/disk_cache_callbacks.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  import "context"
    18  
    19  type DiskCacheCallbacks struct {
    20  	OnWritten []OnDiskCacheWrittenFunc
    21  	OnEvict   []OnDiskCacheEvictFunc
    22  }
    23  
    24  type OnDiskCacheWrittenFunc = func(
    25  	filePath string,
    26  	entry IOEntry,
    27  )
    28  
    29  type OnDiskCacheEvictFunc = func(
    30  	diskFilePath string,
    31  )
    32  
    33  type ctxKeyDiskCacheCallbacks struct{}
    34  
    35  var CtxKeyDiskCacheCallbacks ctxKeyDiskCacheCallbacks
    36  
    37  func OnDiskCacheWritten(ctx context.Context, fn OnDiskCacheWrittenFunc) (ret context.Context) {
    38  	var callbacks *DiskCacheCallbacks
    39  	v := ctx.Value(CtxKeyDiskCacheCallbacks)
    40  	if v == nil {
    41  		callbacks = new(DiskCacheCallbacks)
    42  		ret = context.WithValue(ctx, CtxKeyDiskCacheCallbacks, callbacks)
    43  	} else {
    44  		callbacks = v.(*DiskCacheCallbacks)
    45  		ret = ctx
    46  	}
    47  	callbacks.OnWritten = append(callbacks.OnWritten, fn)
    48  	return
    49  }
    50  
    51  func OnDiskCacheEvict(ctx context.Context, fn OnDiskCacheEvictFunc) (ret context.Context) {
    52  	var callbacks *DiskCacheCallbacks
    53  	v := ctx.Value(CtxKeyDiskCacheCallbacks)
    54  	if v == nil {
    55  		callbacks = new(DiskCacheCallbacks)
    56  		ret = context.WithValue(ctx, CtxKeyDiskCacheCallbacks, callbacks)
    57  	} else {
    58  		callbacks = v.(*DiskCacheCallbacks)
    59  		ret = ctx
    60  	}
    61  	callbacks.OnEvict = append(callbacks.OnEvict, fn)
    62  	return
    63  }