github.com/bytedance/gopkg@v0.0.0-20240514070511-01b2cbcf35e1/cloud/metainfo/kvstore.go (about)

     1  // Copyright 2023 ByteDance Inc.
     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 metainfo
    16  
    17  import "sync"
    18  
    19  type kvstore map[string]string
    20  
    21  var kvpool sync.Pool
    22  
    23  func newKVStore(size ...int) kvstore {
    24  	kvs := kvpool.Get()
    25  	if kvs == nil {
    26  		if len(size) > 0 {
    27  			return make(kvstore, size[0])
    28  		}
    29  		return make(kvstore)
    30  	}
    31  	return kvs.(kvstore)
    32  }
    33  
    34  func (store kvstore) size() int {
    35  	return len(store)
    36  }
    37  
    38  func (store kvstore) recycle() {
    39  	/*
    40  			for k := range m {
    41  				delete(m, k)
    42  			}
    43  		  ==>
    44  			LEAQ    type.map[string]int(SB), AX
    45  			MOVQ    AX, (SP)
    46  			MOVQ    "".m(SB), AX
    47  			MOVQ    AX, 8(SP)
    48  			PCDATA  $1, $0
    49  			CALL    runtime.mapclear(SB)
    50  	*/
    51  	for key := range store {
    52  		delete(store, key)
    53  	}
    54  	kvpool.Put(store)
    55  }