storage

README

The collection of different storage interfaces that are shared by two or more components

If a storage is used by only one component, its interface should be defined in the component package, and implementations under ./plugin/storage/{db_name}/{store_type}/....

Documentation

Overview

Package storage is the collection of different storage interfaces that are shared by two or more components.

If a storage is used by only one component, its interface should be defined in the component package, and implementations under ./plugin/storage/{db_name}/{store_type}/....

Index

• Variables
• type ArchiveFactory
• type Factory
• type MetricsFactory
• type SamplingStoreFactory

Variables

var (
	// ErrArchiveStorageNotConfigured can be returned by the ArchiveFactory when the archive storage is not configured.
	ErrArchiveStorageNotConfigured = errors.New("archive storage not configured")

	// ErrArchiveStorageNotSupported can be returned by the ArchiveFactory when the archive storage is not supported by the backend.
	ErrArchiveStorageNotSupported = errors.New("archive storage not supported")
)

Types

type ArchiveFactory

type ArchiveFactory interface {
	// CreateArchiveSpanReader creates a spanstore.Reader.
	CreateArchiveSpanReader() (spanstore.Reader, error)

	// CreateArchiveSpanWriter creates a spanstore.Writer.
	CreateArchiveSpanWriter() (spanstore.Writer, error)
}

ArchiveFactory is an additional interface that can be implemented by a factory to support trace archiving.

type Factory

type Factory interface {
	// Initialize performs internal initialization of the factory, such as opening connections to the backend store.
	// It is called after all configuration of the factory itself has been done.
	Initialize(metricsFactory metrics.Factory, logger *zap.Logger) error

	// CreateSpanReader creates a spanstore.Reader.
	CreateSpanReader() (spanstore.Reader, error)

	// CreateSpanWriter creates a spanstore.Writer.
	CreateSpanWriter() (spanstore.Writer, error)

	// CreateDependencyReader creates a dependencystore.Reader.
	CreateDependencyReader() (dependencystore.Reader, error)
}

Factory defines an interface for a factory that can create implementations of different storage components. Implementations are also encouraged to implement plugin.Configurable interface.

See also

plugin.Configurable

type MetricsFactory

type MetricsFactory interface {
	// Initialize performs internal initialization of the factory, such as opening connections to the backend store.
	// It is called after all configuration of the factory itself has been done.
	Initialize(logger *zap.Logger) error

	// CreateMetricsReader creates a metricsstore.Reader.
	CreateMetricsReader() (metricsstore.Reader, error)
}

MetricsFactory defines an interface for a factory that can create implementations of different metrics storage components. Implementations are also encouraged to implement plugin.Configurable interface.

See also

plugin.Configurable

type SamplingStoreFactory

type SamplingStoreFactory interface {
	// CreateLock creates a distributed lock.
	CreateLock() (distributedlock.Lock, error)
	// CreateSamplingStore creates a sampling store.
	CreateSamplingStore(maxBuckets int) (samplingstore.Store, error)
}

SamplingStoreFactory defines an interface that is capable of returning the necessary backends for adaptive sampling.