github.com/m3db/m3@v1.5.0/src/x/serialize/types.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 serialize
    22  
    23  import (
    24  	"github.com/m3db/m3/src/dbnode/x/xpool"
    25  	"github.com/m3db/m3/src/metrics/metric/id"
    26  	"github.com/m3db/m3/src/x/checked"
    27  	"github.com/m3db/m3/src/x/ident"
    28  )
    29  
    30  const (
    31  	// HeaderMagicNumber is an internal header used to denote the beginning of
    32  	// an encoded stream.
    33  	HeaderMagicNumber uint16 = 10101
    34  )
    35  
    36  // TagEncoder encodes provided Tag iterators.
    37  type TagEncoder interface {
    38  	// Encode encodes the provided iterator into its internal byte stream.
    39  	// NB: leaves the original iterator un-modified.
    40  	Encode(ident.TagIterator) error
    41  
    42  	// Data returns the encoded bytes.
    43  	// NB: The bytes returned as still owned by the TagEncoder. i.e. They are
    44  	// only safe for use until Reset/Finalize is called upon the original
    45  	// TagEncoder.
    46  	Data() (checked.Bytes, bool)
    47  
    48  	// Reset resets the internal state to allow reuse of the encoder.
    49  	Reset()
    50  
    51  	// Finalize releases any held resources.
    52  	Finalize()
    53  }
    54  
    55  // TagEncoderPool pools TagEncoders.
    56  type TagEncoderPool interface {
    57  	// Init initializes the pool.
    58  	Init()
    59  
    60  	// Get returns an encoder. NB: calling Finalize() on the
    61  	// returned TagEncoder puts it back in the pool.
    62  	Get() TagEncoder
    63  
    64  	// Put puts the encoder back in the pool.
    65  	Put(TagEncoder)
    66  }
    67  
    68  // TagDecoder decodes an encoded byte stream to a TagIterator.
    69  type TagDecoder interface {
    70  	ident.TagIterator
    71  
    72  	// Reset resets internal state to iterate over the provided bytes.
    73  	// NB: the TagDecoder takes ownership of the provided checked.Bytes.
    74  	Reset(checked.Bytes)
    75  }
    76  
    77  // TagDecoderPool pools TagDecoders.
    78  type TagDecoderPool interface {
    79  	// Init initializes the pool.
    80  	Init()
    81  
    82  	// Get returns a decoder. NB: calling Finalize() on the
    83  	// returned TagDecoder puts it back in the pool.
    84  	Get() TagDecoder
    85  
    86  	// Put puts the decoder back in the pool.
    87  	Put(TagDecoder)
    88  }
    89  
    90  // TagEncoderOptions sets the knobs for TagEncoder limits.
    91  type TagEncoderOptions interface {
    92  	// SetInitialCapacity sets the initial capacity of the bytes underlying
    93  	// the TagEncoder.
    94  	SetInitialCapacity(v int) TagEncoderOptions
    95  
    96  	// InitialCapacity returns the initial capacity of the bytes underlying
    97  	// the TagEncoder.
    98  	InitialCapacity() int
    99  
   100  	// SetTagSerializationLimits sets the TagSerializationLimits.
   101  	SetTagSerializationLimits(v TagSerializationLimits) TagEncoderOptions
   102  
   103  	// TagSerializationLimits returns the TagSerializationLimits.
   104  	TagSerializationLimits() TagSerializationLimits
   105  }
   106  
   107  // TagDecoderOptions sets the knobs for TagDecoders.
   108  type TagDecoderOptions interface {
   109  	// SetCheckedBytesWrapperPool sets the checked.Bytes wrapper pool.
   110  	SetCheckedBytesWrapperPool(v xpool.CheckedBytesWrapperPool) TagDecoderOptions
   111  
   112  	// CheckedBytesWrapperPool returns the checked.Bytes wrapper pool.
   113  	CheckedBytesWrapperPool() xpool.CheckedBytesWrapperPool
   114  
   115  	// SetTagSerializationLimits sets the TagSerializationLimits.
   116  	SetTagSerializationLimits(v TagSerializationLimits) TagDecoderOptions
   117  
   118  	// TagSerializationLimits returns the TagSerializationLimits.
   119  	TagSerializationLimits() TagSerializationLimits
   120  }
   121  
   122  // TagSerializationLimits sets the limits around tag serialization.
   123  type TagSerializationLimits interface {
   124  	// SetMaxNumberTags sets the maximum number of tags allowed.
   125  	SetMaxNumberTags(uint16) TagSerializationLimits
   126  
   127  	// MaxNumberTags returns the maximum number of tags allowed.
   128  	MaxNumberTags() uint16
   129  
   130  	// SetMaxTagLiteralLength sets the maximum length of a tag Name/Value.
   131  	SetMaxTagLiteralLength(uint16) TagSerializationLimits
   132  
   133  	// MaxTagLiteralLength returns the maximum length of a tag Name/Value.
   134  	MaxTagLiteralLength() uint16
   135  }
   136  
   137  // MetricTagsIterator iterates over a set of tags.
   138  type MetricTagsIterator interface {
   139  	id.ID
   140  	id.SortedTagIterator
   141  	NumTags() int
   142  }
   143  
   144  // MetricTagsIteratorPool pools MetricTagsIterator.
   145  type MetricTagsIteratorPool interface {
   146  	Init()
   147  	Get() MetricTagsIterator
   148  	Put(iter MetricTagsIterator)
   149  }