github.com/m3db/m3@v1.5.0/src/dbnode/client/consistency_level.go (about)

     1  // Copyright (c) 2018 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 client
    22  
    23  import (
    24  	"github.com/m3db/m3/src/dbnode/topology"
    25  )
    26  
    27  // runtimeReadConsistencyLevel is a queryable value for a
    28  // read consistency level, this supports it being able to change
    29  // dynamically or it can be just static if not required to be changed
    30  // during an operation.
    31  type runtimeReadConsistencyLevel interface {
    32  	value() topology.ReadConsistencyLevel
    33  }
    34  
    35  type staticRuntimeReadConsistencyLevel struct {
    36  	val topology.ReadConsistencyLevel
    37  }
    38  
    39  func newStaticRuntimeReadConsistencyLevel(
    40  	value topology.ReadConsistencyLevel,
    41  ) runtimeReadConsistencyLevel {
    42  	return staticRuntimeReadConsistencyLevel{val: value}
    43  }
    44  
    45  func (l staticRuntimeReadConsistencyLevel) value() topology.ReadConsistencyLevel {
    46  	return l.val
    47  }
    48  
    49  // nolint: unused
    50  type sessionReadRuntimeReadConsistencyLevel struct {
    51  	s *session
    52  }
    53  
    54  // nolint: unused
    55  func newSessionReadRuntimeReadConsistencyLevel(
    56  	s *session,
    57  ) runtimeReadConsistencyLevel {
    58  	return sessionReadRuntimeReadConsistencyLevel{s: s}
    59  }
    60  
    61  func (l sessionReadRuntimeReadConsistencyLevel) value() topology.ReadConsistencyLevel {
    62  	l.s.state.RLock()
    63  	value := l.s.state.readLevel
    64  	l.s.state.RUnlock()
    65  	return value
    66  }
    67  
    68  type sessionBootstrapRuntimeReadConsistencyLevel struct {
    69  	s *session
    70  }
    71  
    72  func newSessionBootstrapRuntimeReadConsistencyLevel(
    73  	s *session,
    74  ) runtimeReadConsistencyLevel {
    75  	return sessionBootstrapRuntimeReadConsistencyLevel{s: s}
    76  }
    77  
    78  func (l sessionBootstrapRuntimeReadConsistencyLevel) value() topology.ReadConsistencyLevel {
    79  	l.s.state.RLock()
    80  	value := l.s.state.bootstrapLevel
    81  	l.s.state.RUnlock()
    82  	return value
    83  }