github.com/m3db/m3@v1.5.0/src/dbnode/namespace/static.go (about)

     1  // Copyright (c) 2017 Uber Technologies, Inc.
     2  //
     3  // Permission is hereby granted, free of charge, to any person obtaining a copy
     4  // of this software and associated documentation files (the "Software"), to deal
     5  // in the Software without restriction, including without limitation the rights
     6  // to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
     7  // copies of the Software, and to permit persons to whom the Software is
     8  // furnished to do so, subject to the following conditions:
     9  //
    10  // The above copyright notice and this permission notice shall be included in
    11  // all copies or substantial portions of the Software.
    12  //
    13  // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
    14  // IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
    15  // FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
    16  // AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
    17  // LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
    18  // OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
    19  // THE SOFTWARE.
    20  
    21  package namespace
    22  
    23  import (
    24  	xwatch "github.com/m3db/m3/src/x/watch"
    25  )
    26  
    27  type staticInit struct {
    28  	metadatas []Metadata
    29  }
    30  
    31  // NewStaticInitializer returns a new static registry initializer
    32  func NewStaticInitializer(metadatas []Metadata) Initializer {
    33  	return &staticInit{
    34  		metadatas: metadatas,
    35  	}
    36  }
    37  
    38  func (i *staticInit) Init() (Registry, error) {
    39  	return newStaticRegistry(i.metadatas)
    40  }
    41  
    42  type staticReg struct {
    43  	xwatch.Watchable
    44  }
    45  
    46  func newStaticRegistry(metadatas []Metadata) (Registry, error) {
    47  	m, err := NewMap(metadatas)
    48  	if err != nil {
    49  		return nil, err
    50  	}
    51  	reg := &staticReg{xwatch.NewWatchable()}
    52  	if err := reg.Update(m); err != nil {
    53  		return nil, err
    54  	}
    55  	return reg, nil
    56  }
    57  
    58  func (r *staticReg) Watch() (Watch, error) {
    59  	_, w, err := r.Watchable.Watch()
    60  	if err != nil {
    61  		return nil, err
    62  	}
    63  	return NewWatch(w), nil
    64  }
    65  
    66  func (r *staticReg) Close() error {
    67  	r.Watchable.Close()
    68  	return nil
    69  }