github.com/m3db/m3@v1.5.0/src/dbnode/storage/namespace_bootstrap_data_accumulator.go (about)

     1  // Copyright (c) 2019 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 storage
    22  
    23  import (
    24  	"errors"
    25  	"sync"
    26  
    27  	"github.com/m3db/m3/src/dbnode/storage/bootstrap"
    28  	"github.com/m3db/m3/src/x/ident"
    29  )
    30  
    31  var (
    32  	errAlreadyClosed = errors.New("accumulator already closed")
    33  )
    34  
    35  type namespaceDataAccumulator struct {
    36  	sync.RWMutex
    37  	closed       bool
    38  	namespace    databaseNamespace
    39  	needsRelease []bootstrap.SeriesRefResolver
    40  }
    41  
    42  // NewDatabaseNamespaceDataAccumulator creates a data accumulator for
    43  // the namespace.
    44  func NewDatabaseNamespaceDataAccumulator(
    45  	namespace databaseNamespace,
    46  ) bootstrap.NamespaceDataAccumulator {
    47  	return &namespaceDataAccumulator{
    48  		namespace: namespace,
    49  	}
    50  }
    51  
    52  func (a *namespaceDataAccumulator) CheckoutSeriesWithoutLock(
    53  	shardID uint32,
    54  	id ident.ID,
    55  	tags ident.TagIterator,
    56  ) (bootstrap.CheckoutSeriesResult, bool, error) {
    57  	resolver, owned, err := a.namespace.SeriesRefResolver(shardID, id, tags)
    58  	if err != nil {
    59  		return bootstrap.CheckoutSeriesResult{}, owned, err
    60  	}
    61  
    62  	a.needsRelease = append(a.needsRelease, resolver)
    63  	return bootstrap.CheckoutSeriesResult{
    64  		Resolver: resolver,
    65  		Shard:    shardID,
    66  	}, true, nil
    67  }
    68  
    69  func (a *namespaceDataAccumulator) CheckoutSeriesWithLock(
    70  	shardID uint32,
    71  	id ident.ID,
    72  	tags ident.TagIterator,
    73  ) (bootstrap.CheckoutSeriesResult, bool, error) {
    74  	a.Lock()
    75  	result, owned, err := a.CheckoutSeriesWithoutLock(shardID, id, tags)
    76  	a.Unlock()
    77  	return result, owned, err
    78  }
    79  
    80  func (a *namespaceDataAccumulator) Close() error {
    81  	a.Lock()
    82  	defer a.Unlock()
    83  
    84  	if a.closed {
    85  		return errAlreadyClosed
    86  	}
    87  
    88  	// Release all refs.
    89  	for _, elem := range a.needsRelease {
    90  		elem.ReleaseRef()
    91  	}
    92  
    93  	a.closed = true
    94  
    95  	// Memset optimization for reset.
    96  	for i := range a.needsRelease {
    97  		a.needsRelease[i] = nil
    98  	}
    99  	a.needsRelease = a.needsRelease[:0]
   100  
   101  	return nil
   102  }