container

Documentation

Overview

A collection of models. Provides methods to reconcile the collection of stored models with the collection of desired models.

Container

|__Collector
|__Collector
|__Collector

The container is a collection of data model collectors. Each collector is responsible for ensuring that changes made to the external data source are reflected in the DB. The goal is for the data model to be eventually consistent.

Index

• type Collection
  • func (r *Collection) Add(desired fb.Iterator) error
  • func (r *Collection) Delete(desired fb.Iterator) error
  • func (r *Collection) Reconcile(desired fb.Iterator) (err error)
  • func (r *Collection) Update(desired fb.Iterator) error
• type Collector
• type Container
  • func New() *Container
  • func (c *Container) Add(collector Collector) (err error)
  • func (c *Container) Delete(owner meta.Object) (p Collector, found bool)
  • func (c *Container) Get(owner meta.Object) (Collector, bool)
  • func (c *Container) List() []Collector
  • func (c *Container) Replace(collector Collector) (p Collector, found bool, err error)
• type DefaultShepherd
  • func (r *DefaultShepherd) Equals(mA, mB model.Model) bool
  • func (r *DefaultShepherd) Update(mA, mB model.Model)
• type Disposition
• type Dispositions
• type Key
• type Shepherd

Types

type Collection

type Collection struct {
	// Stored models.
	Stored fb.Iterator
	// DB transaction.
	Tx *model.Tx
	// An (optional) shepherd.
	Shepherd Shepherd
	// Number of models added.
	Added int
	// Number models updated.
	Updated int
	// Number models deleted.
	Deleted int
}

Model collection.

func (*Collection) Add

func (r *Collection) Add(desired fb.Iterator) error

Add models included in desired but not stored.

func (*Collection) Delete

func (r *Collection) Delete(desired fb.Iterator) error

Delete stored models not included in the desired.

func (*Collection) Reconcile

func (r *Collection) Reconcile(desired fb.Iterator) (err error)

Reconcile the collection. Ensure the stored collection is as desired.

func (*Collection) Update

func (r *Collection) Update(desired fb.Iterator) error

Update models.

type Collector

type Collector interface {
	// The name.
	Name() string
	// The resource that owns the collector.
	Owner() meta.Object
	// Start the collector.
	// Expected to do basic validation, start a
	// goroutine and return quickly.
	Start() error
	// Shutdown the collector.
	// Expected to disconnect, destroy created resources
	// and return quickly.
	Shutdown()
	// The collector has achieved parity.
	HasParity() bool
	// Get the associated DB.
	DB() model.DB
	// Return the status code of the connection
	// 0 = Ignore
	Test() (int, error)
	// Follow the link
	Follow(moRef interface{}, p []string, dst interface{}) error
	// Reset
	Reset()
	// Get the system version - currently, ovirt-only
	Version() (string, string, string, string, error)
}

Data collector.

type Container

type Container struct {
	// contains filtered or unexported fields
}

A container manages a collection of `Collector`.

func New

func New() *Container

Build a new container.

func (*Container) Add

func (c *Container) Add(collector Collector) (err error)

Add a collector.

func (*Container) Delete

func (c *Container) Delete(owner meta.Object) (p Collector, found bool)

Delete the collector.

func (*Container) Get

func (c *Container) Get(owner meta.Object) (Collector, bool)

Get a collector by (CR) object.

func (*Container) List

func (c *Container) List() []Collector

List all collectors.

func (*Container) Replace

func (c *Container) Replace(collector Collector) (p Collector, found bool, err error)

Replace a collector.

type DefaultShepherd

type DefaultShepherd struct {
}

Default (reflect-based) shepherd. Fields are ignored when:

• Is the PK.
• Is (auto) incremented.
• Has the `eq:"-"` tag.

func (*DefaultShepherd) Equals

func (r *DefaultShepherd) Equals(mA, mB model.Model) bool

Model comparison.

func (*DefaultShepherd) Update

func (r *DefaultShepherd) Update(mA, mB model.Model)

Update model A (stored) with model B (desired).

type Disposition

type Disposition struct {
	// contains filtered or unexported fields
}

Disposition.

type Dispositions

type Dispositions map[string]*Disposition

Disposition map.

type Key

type Key core.ObjectReference

Collector key.

type Shepherd

type Shepherd interface {
	// Determine if model needs to be updated.
	Equals(mA, mB model.Model) bool
	// Update the stored model as desired.
	Update(stored, desired model.Model)
}

Model shepherd.