github.com/m3db/m3@v1.5.0/src/metrics/policy/drop_policy.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
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     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 policy
    22  
    23  // DropPolicy is a metrics dropping policy.
    24  type DropPolicy uint
    25  
    26  // NB(r): The enum values are an exact match with protobuf values so they can
    27  // be casted to each other.
    28  const (
    29  	// DropNone specifies not to drop any of the matched metrics.
    30  	DropNone DropPolicy = iota
    31  	// DropMust specifies to always drop matched metrics, irregardless of
    32  	// other rules. Metrics are not dropped from the rollup rules.
    33  	DropMust
    34  	// DropIfOnlyMatch specifies to drop matched metrics, but only if no
    35  	// other rules match. Metrics are not dropped from the rollup rules.
    36  	DropIfOnlyMatch
    37  
    38  	// DefaultDropPolicy is to drop none.
    39  	DefaultDropPolicy = DropNone
    40  )
    41  
    42  var validDropPolicies = []DropPolicy{
    43  	DropNone,
    44  	DropMust,
    45  	DropIfOnlyMatch,
    46  }
    47  
    48  // IsDefault returns whether the drop policy is the default drop none policy.
    49  func (p DropPolicy) IsDefault() bool {
    50  	return p == DefaultDropPolicy
    51  }
    52  
    53  func (p DropPolicy) String() string {
    54  	switch p {
    55  	case DropNone:
    56  		return "drop_none"
    57  	case DropMust:
    58  		return "drop_must"
    59  	case DropIfOnlyMatch:
    60  		return "drop_if_only_match"
    61  	}
    62  	return DropNone.String()
    63  }
    64  
    65  // IsValid returns whether a drop policy value is a known valid value.
    66  func (p DropPolicy) IsValid() bool {
    67  	for _, policy := range validDropPolicies {
    68  		if policy == p {
    69  			return true
    70  		}
    71  	}
    72  	return false
    73  }
    74  
    75  // ValidDropPolicies returns a copy of all the valid drop policies.
    76  func ValidDropPolicies() []DropPolicy {
    77  	return append([]DropPolicy(nil), validDropPolicies...)
    78  }