manipulate

package module
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 Go to latest Published: Jun 28, 2019 License: Apache-2.0 Imports: 5 Imported by: 42

README

Manipulate

codecov

README IS A WORK IN PROGRESS AS WE ARE WRITTING MORE DOCUMENTATION ABOUT THIS PACKAGE.

Package manipulate provides everything needed to perform CRUD operations on an elemental based data model.

The main interface is Manipulator. This interface provides various methods for creation, modification, retrieval and so on.

A Manipulator works with elemental.Identifiable.

The storage engine used by a Manipulator is abstracted. By default manipulate provides implementations for Mongo, ReST HTTP, Websocket and a Memory backed datastore. You can of course implement Your own storage implementation.

Each method of a Manipulator is taking a manipulate.Context as argument. The context is used to pass additional informations like a Filter, or some Parameters.

Example for creating an object

// Create a User from a generated Elemental model.
user := models.NewUser() // always use the initializer to get various default value correctly set.
user.FullName := "Antoine Mercadal"
user.Login := "primalmotion"

// Create Mongo Manipulator.
m := manipmongo.New("127.0.0.1", "test")

// Then create the User.
m.Create(nil, user)

Example for retreving an object

// Create a Context with a filter.
ctx := manipulate.NewContextWithFilter(manipulate.NewFilterComposer().
    WithKey("login").Equals("primalmotion").
    Done(),
)

// Retrieve the users matching the filter.
var users models.UserLists
m.RetrieveMany(ctx, &users)

Documentation

Overview

Package manipulate provides everything needed to perform CRUD operations on an https://go.aporeto.io/elemental based data model.

The main interface is Manipulator. This interface provides various methods for creation, modification, retrieval and so on. TransactionalManipulator, which is an extension of the Manipulator add methods to manage transactions, like Commit and Abort.

A Manipulator works with some elemental.Identifiables.

The storage engine used by a Manipulator is abstracted. By default manipulate provides implementations for Rest API over HTTP or websocket, Mongo DB, Memory and a mock Manipulator for unit testing. You can of course create your own implementation.

Each method of a Manipulator is taking a manipulate.Context as argument. The context is used to pass additional informations like a Filter or some Parameters.

Example for creating an object: 

// Create a User from a generated Elemental model.
user := models.NewUser()
user.FullName, user.Login := "Antoine Mercadal", "primalmotion"

// Create Mongo Manipulator.
m := manipmongo.NewMongoManipulator([]{"127.0.0.1"}, "test", "db-username", "db-password", "db-authsource", 512)

// Then create the User.
m.Create(nil, user)

Example for retreving an object: 

// Create a Context with a filter.
ctx := manipulate.NewContextWithFilter(
    manipulate.NewFilterComposer().WithKey("login").Equals("primalmotion").
    Done())

// Retrieve the users matching the filter.
var users models.UserLists
m.RetrieveMany(ctx, models.UserIdentity, &users)

Index

Constants

This section is empty.

Variables

This section is empty.

Functions

func IsCannotBuildQueryError 

func IsCannotBuildQueryError(err error) bool

IsCannotBuildQueryError returns true if the given error is am ErrCannotBuildQuery.

func IsCannotCommitError 

func IsCannotCommitError(err error) bool

IsCannotCommitError returns true if the given error is am ErrCannotCommit.

func IsCannotCommunicateError 

func IsCannotCommunicateError(err error) bool

IsCannotCommunicateError returns true if the given error is am ErrCannotCommunicate.

func IsCannotExecuteQueryError 

func IsCannotExecuteQueryError(err error) bool

IsCannotExecuteQueryError returns true if the given error is am ErrCannotExecuteQuery.

func IsCannotMarshalError 

func IsCannotMarshalError(err error) bool

IsCannotMarshalError returns true if the given error is am ErrCannotMarshal.

func IsCannotUnmarshalError 

func IsCannotUnmarshalError(err error) bool

IsCannotUnmarshalError returns true if the given error is am ErrCannotUnmarshal.

func IsConstraintViolationError 

func IsConstraintViolationError(err error) bool

IsConstraintViolationError returns true if the given error is am ErrConstraintViolation.

func IsDisconnectedError 

func IsDisconnectedError(err error) bool

IsDisconnectedError returns true if the given error is am ErrDisconnected.

func IsLockedError 

func IsLockedError(err error) bool

IsLockedError returns true if the given error is am ErrLocked.

func IsMultipleObjectsFoundError 

func IsMultipleObjectsFoundError(err error) bool

IsMultipleObjectsFoundError returns true if the given error is am ErrMultipleObjectsFound.

func IsNotImplementedError 

func IsNotImplementedError(err error) bool

IsNotImplementedError returns true if the given error is am ErrNotImplemented.

func IsObjectNotFoundError 

func IsObjectNotFoundError(err error) bool

IsObjectNotFoundError returns true if the given error is am ErrObjectNotFound.

func IsTLSError 

func IsTLSError(err error) bool

IsTLSError returns true if the given error is am ErrTLS.

func IsTooManyRequestsError 

func IsTooManyRequestsError(err error) bool

IsTooManyRequestsError returns true if the given error is am ErrTooManyRequests.

func IsTransactionNotFoundError 

func IsTransactionNotFoundError(err error) bool

IsTransactionNotFoundError returns true if the given error is am ErrTransactionNotFound.

func Iter 

func Iter(
	ctx context.Context,
	m Manipulator,
	mctx Context,
	identifiablesTemplate elemental.Identifiables,
	blockSize int,
) (elemental.Identifiables, error)

Iter is a helper function for IterFunc.

It will simply iterates on the object with identity of the given elemental.Identifiables. Not that this function cannot populate the data in the identifiable parameter. Instead It will return the destination.

Always pass an empty elemental.Identifiables to this function

For more information, please check IterFunc documentation.

Example: 

dest, err := Iter(context.Background(), m, mctx, model.ThingsList{}, 100)

func IterFunc 

func IterFunc(
	ctx context.Context,
	manipulator Manipulator,
	identifiablesTemplate elemental.Identifiables,
	mctx Context,
	iteratorFunc func(block elemental.Identifiables) error,
	blockSize int,
) error

IterFunc calls RetrieveMany on the given Manipulator, and will retrieve the data by block of the given blockSize.

IterFunc will naturally ends and return when there is no more data to pull.

For each retrieved block, the given func will be called with the current data block. If the function returns an error, the error is returned to the caller of IterFunc and the iteration stops.

The given context will be used if the underlying manipulator honors it. Be careful to NOT pass a filter matching objects then updating the objects to not match anynmore. This would shift pagination and will produce unexpected results. To do so, prefer using manipulate.IterUntilFunc

The given manipulate.Context will be used to retry any failed batch recovery.

The identifiablesTemplate parameter is must be an empty elemental.Identifiables that will be used to hold the data block. It is reset at every iteration. Do not rely on it to be filled once IterFunc is complete.

Finally, if the given blockSize is <= 0, then it will use the default that is 1000.

func IterUntilFunc added in v1.65.0 

func IterUntilFunc(
	ctx context.Context,
	manipulator Manipulator,
	identifiablesTemplate elemental.Identifiables,
	mctx Context,
	iteratorFunc func(block elemental.Identifiables) error,
	blockSize int,
) error

IterUntilFunc works as IterFunc but pagination will not increase. It will always retrieve the first page with a size of given blockSize.

The goal of this function is to be used with a filter, then update (or delete) the objects that match until no more are matching.

func Retry 

func Retry(ctx context.Context, manipulateFunc func() error, onRetryFunc func(int, error) error) error

Retry is deprecated and only calls manipulateFunc for backward compatibility.

Types

type BufferedManipulator 

type BufferedManipulator interface {
	FlushableManipulator
	Manipulator
}

A BufferedManipulator is a Manipulator with a local cache

type Context 

type Context interface {
	Count() int
	SetCount(count int)
	Filter() *elemental.Filter
	Finalizer() FinalizerFunc
	Version() int
	TransactionID() TransactionID
	Page() int
	PageSize() int
	Override() bool
	Recursive() bool
	Namespace() string
	Credentials() (string, string)
	Parameters() url.Values
	Parent() elemental.Identifiable
	ExternalTrackingID() string
	ExternalTrackingType() string
	Order() []string
	Context() context.Context
	Derive(...ContextOption) Context
	Fields() []string
	ReadConsistency() ReadConsistency
	WriteConsistency() WriteConsistency
	Messages() []string
	SetMessages([]string)
	ClientIP() string
	RetryFunc() RetryFunc
	RetryRatio() int64

	fmt.Stringer
}

A Context holds all information regarding a particular manipulate operation.

func NewContext 

func NewContext(ctx context.Context, options ...ContextOption) Context

NewContext creates a context with the given ContextOption.

type ContextOption 

type ContextOption func(*mcontext)

ContextOption represents an option can can be passed to NewContext.

func ContextOptionClientIP added in v1.54.1 

func ContextOptionClientIP(clientIP string) ContextOption

ContextOptionClientIP sets the optional headers for the request.

func ContextOptionCredentials added in v1.54.1 

func ContextOptionCredentials(username, password string) ContextOption

ContextOptionCredentials sets user name and password for this context.

func ContextOptionFields 

func ContextOptionFields(fields []string) ContextOption

ContextOptionFields sets the list of fields to include in the reply.

func ContextOptionFilter 

func ContextOptionFilter(f *elemental.Filter) ContextOption

ContextOptionFilter sets the filter.

func ContextOptionFinalizer 

func ContextOptionFinalizer(f FinalizerFunc) ContextOption

ContextOptionFinalizer sets the create finalizer option of the context.

func ContextOptionNamespace 

func ContextOptionNamespace(n string) ContextOption

ContextOptionNamespace sets the namespace.

func ContextOptionOrder 

func ContextOptionOrder(orders ...string) ContextOption

ContextOptionOrder sets the ordering option of the context.

func ContextOptionOverride 

func ContextOptionOverride(o bool) ContextOption

ContextOptionOverride sets the override option of the context.

func ContextOptionPage 

func ContextOptionPage(n, size int) ContextOption

ContextOptionPage sets the pagination option of the context.

func ContextOptionParameters 

func ContextOptionParameters(p url.Values) ContextOption

ContextOptionParameters sets the parameters option of the context.

func ContextOptionParent 

func ContextOptionParent(i elemental.Identifiable) ContextOption

ContextOptionParent sets the parent option of the context.

func ContextOptionReadConsistency 

func ContextOptionReadConsistency(consistency ReadConsistency) ContextOption

ContextOptionReadConsistency sets the desired read consistency of the request.

func ContextOptionRecursive 

func ContextOptionRecursive(r bool) ContextOption

ContextOptionRecursive sets the recursive option of the context.

func ContextOptionRetryFunc added in v1.61.0 

func ContextOptionRetryFunc(f RetryFunc) ContextOption

ContextOptionRetryFunc sets the retry function. This function will be called on every communication error, and will be passed the try number and the error. If it itself return an error, retrying will stop and that error will be returned from the manipulator operation.

func ContextOptionRetryRatio added in v1.61.0 

func ContextOptionRetryRatio(r int64) ContextOption

ContextOptionRetryRatio sets the retry ratio.

RetryRatio divides the remaining time unitl context deadline to perfrom single retry query down to a minimum defined by manipulator implementations (typically 20s). The default value is 4.

For example if the context has a timeout of 2m, each retry will use a sub context with a timeout of 30s.

func ContextOptionToken added in v1.54.1 

func ContextOptionToken(token string) ContextOption

ContextOptionToken sets the token for this request.

func ContextOptionTracking 

func ContextOptionTracking(identifier, typ string) ContextOption

ContextOptionTracking sets the opentracing tracking option of the context.

func ContextOptionTransactionID added in v1.65.1 

func ContextOptionTransactionID(tid TransactionID) ContextOption

ContextOptionTransactionID sets the parameters option of the context.

func ContextOptionVersion 

func ContextOptionVersion(v int) ContextOption

ContextOptionVersion sets the version option of the context.

func ContextOptionWriteConsistency 

func ContextOptionWriteConsistency(consistency WriteConsistency) ContextOption

ContextOptionWriteConsistency sets the desired write consistency of the request.

type ErrCannotBuildQuery 

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

ErrCannotBuildQuery represents query building error.

func NewErrCannotBuildQuery 

func NewErrCannotBuildQuery(message string) ErrCannotBuildQuery

NewErrCannotBuildQuery returns a new ErrCannotBuildQuery.

func (ErrCannotBuildQuery) Error 

func (e ErrCannotBuildQuery) Error() string

type ErrCannotCommit 

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

ErrCannotCommit represents commit execution error.

func NewErrCannotCommit 

func NewErrCannotCommit(message string) ErrCannotCommit

NewErrCannotCommit returns a new ErrCannotCommit.

func (ErrCannotCommit) Error 

func (e ErrCannotCommit) Error() string

type ErrCannotCommunicate 

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

ErrCannotCommunicate represents a failure in backend communication.

func NewErrCannotCommunicate 

func NewErrCannotCommunicate(message string) ErrCannotCommunicate

NewErrCannotCommunicate returns a new ErrCannotCommunicate.

func (ErrCannotCommunicate) Error 

func (e ErrCannotCommunicate) Error() string

type ErrCannotExecuteQuery 

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

ErrCannotExecuteQuery represents query execution error.

func NewErrCannotExecuteQuery 

func NewErrCannotExecuteQuery(message string) ErrCannotExecuteQuery

NewErrCannotExecuteQuery returns a new ErrCannotExecuteQuery.

func (ErrCannotExecuteQuery) Error 

func (e ErrCannotExecuteQuery) Error() string

type ErrCannotMarshal 

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

ErrCannotMarshal represents marshaling error.

func NewErrCannotMarshal 

func NewErrCannotMarshal(message string) ErrCannotMarshal

NewErrCannotMarshal returns a new ErrCannotMarshal.

func (ErrCannotMarshal) Error 

func (e ErrCannotMarshal) Error() string

type ErrCannotUnmarshal 

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

ErrCannotUnmarshal represents unmarshaling error.

func NewErrCannotUnmarshal 

func NewErrCannotUnmarshal(message string) ErrCannotUnmarshal

NewErrCannotUnmarshal returns a new ErrCannotUnmarshal.

func (ErrCannotUnmarshal) Error 

func (e ErrCannotUnmarshal) Error() string

type ErrConstraintViolation 

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

ErrConstraintViolation represents a failure to find a transaction.

func NewErrConstraintViolation 

func NewErrConstraintViolation(message string) ErrConstraintViolation

NewErrConstraintViolation returns a new ErrConstraintViolation.

func (ErrConstraintViolation) Error 

func (e ErrConstraintViolation) Error() string

type ErrDisconnected 

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

ErrDisconnected represents an error due user disconnection.

func NewErrDisconnected 

func NewErrDisconnected(message string) ErrDisconnected

NewErrDisconnected returns a new ErrDisconnected.

func (ErrDisconnected) Error 

func (e ErrDisconnected) Error() string

type ErrLocked 

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

ErrLocked represents the error returned when the server api is locked..

func NewErrLocked 

func NewErrLocked(message string) ErrLocked

NewErrLocked returns a new ErrCannotCommunicate.

func (ErrLocked) Error 

func (e ErrLocked) Error() string

type ErrMultipleObjectsFound 

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

ErrMultipleObjectsFound represents too many object found error.

func NewErrMultipleObjectsFound 

func NewErrMultipleObjectsFound(message string) ErrMultipleObjectsFound

NewErrMultipleObjectsFound returns a new ErrMultipleObjectsFound.

func (ErrMultipleObjectsFound) Error 

func (e ErrMultipleObjectsFound) Error() string

type ErrNotImplemented 

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

ErrNotImplemented represents a non implemented function.

func NewErrNotImplemented 

func NewErrNotImplemented(message string) ErrNotImplemented

NewErrNotImplemented returns a new ErrNotImplemented.

func (ErrNotImplemented) Error 

func (e ErrNotImplemented) Error() string

type ErrObjectNotFound 

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

ErrObjectNotFound represents object not found error.

func NewErrObjectNotFound 

func NewErrObjectNotFound(message string) ErrObjectNotFound

NewErrObjectNotFound returns a new ErrObjectNotFound.

func (ErrObjectNotFound) Error 

func (e ErrObjectNotFound) Error() string

type ErrTLS 

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

ErrTLS represents the error returned when there is a TLS error.

func NewErrTLS 

func NewErrTLS(message string) ErrTLS

NewErrTLS returns a new ErrTLS.

func (ErrTLS) Error 

func (e ErrTLS) Error() string

type ErrTooManyRequests 

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

ErrTooManyRequests represents the error returned when the server api is locked.

func NewErrTooManyRequests 

func NewErrTooManyRequests(message string) ErrTooManyRequests

NewErrTooManyRequests returns a new ErrTooManyRequests.

func (ErrTooManyRequests) Error 

func (e ErrTooManyRequests) Error() string

type ErrTransactionNotFound 

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

ErrTransactionNotFound represents a failure to find a transaction.

func NewErrTransactionNotFound 

func NewErrTransactionNotFound(message string) ErrTransactionNotFound

NewErrTransactionNotFound returns a new ErrTransactionNotFound.

func (ErrTransactionNotFound) Error 

func (e ErrTransactionNotFound) Error() string

type Filter 

type Filter = elemental.Filter

Filter is an alias of elemental.Filter

func NewFilter 

func NewFilter() *Filter

NewFilter returns a new Filter using the aliased type.

func NewFilterFromString 

func NewFilterFromString(filter string) (*Filter, error)

NewFilterFromString returns a new NewFilterFromString using the aliased type.

type FilterKeyComposer 

type FilterKeyComposer = elemental.FilterKeyComposer

FilterKeyComposer is an alias of elemental.FilterKeyComposer

func NewFilterComposer 

func NewFilterComposer() FilterKeyComposer

NewFilterComposer returns a new FilterKeyComposer using the aliased type.

type FilterParser 

type FilterParser = elemental.FilterParser

FilterParser is an alias of elemental.FilterParser

func NewFilterParser 

func NewFilterParser(input string) *FilterParser

NewFilterParser returns a new NewFilterParser using the aliased type.

type FinalizerFunc 

type FinalizerFunc func(o elemental.Identifiable) error

A FinalizerFunc is the type of a function that can be used as a creation finalizer. This is only supported by manipulators that generate an ID to let a chance to the user. to now the intended ID before actually creating the object.

type FlushableManipulator 

type FlushableManipulator interface {

	// Flush flushes and empties the cache.
	Flush(ctx context.Context) error
}

A FlushableManipulator is a manipulator that can flush its content to somewhere, like a file.

type Manipulator 

type Manipulator interface {

	// RetrieveMany retrieves the a list of objects with the given elemental.Identity and put them in the given dest.
	RetrieveMany(mctx Context, dest elemental.Identifiables) error

	// Retrieve retrieves one or multiple elemental.Identifiables.
	// In order to be retrievable, the elemental.Identifiable needs to have their Identifier correctly set.
	Retrieve(mctx Context, object elemental.Identifiable) error

	// Create creates a the given elemental.Identifiables.
	Create(mctx Context, object elemental.Identifiable) error

	// Update updates one or multiple elemental.Identifiables.
	// In order to be updatable, the elemental.Identifiable needs to have their Identifier correctly set.
	Update(mctx Context, object elemental.Identifiable) error

	// Delete deletes one or multiple elemental.Identifiables.
	// In order to be deletable, the elemental.Identifiable needs to have their Identifier correctly set.
	Delete(mctx Context, object elemental.Identifiable) error

	// DeleteMany deletes all objects of with the given identity or
	// all the ones matching the filter in the given context.
	DeleteMany(mctx Context, identity elemental.Identity) error

	// Count returns the number of objects with the given identity.
	Count(mctx Context, identity elemental.Identity) (int, error)
}

Manipulator is the interface of a storage backend.

type ReadConsistency 

type ReadConsistency string

ReadConsistency represents the desired consistency of the request. Not all driver may implement this. 

const (
	ReadConsistencyDefault   ReadConsistency = "default"
	ReadConsistencyNearest   ReadConsistency = "nearest"
	ReadConsistencyEventual  ReadConsistency = "eventual"
	ReadConsistencyMonotonic ReadConsistency = "monotonic"
	ReadConsistencyStrong    ReadConsistency = "strong"
)

Various values for Consistency

type RetryFunc added in v1.61.0 

type RetryFunc func(RetryInfo) error

A RetryFunc is a function that can be called during an auto retry. The current manipulate.Context is given, a Stringer interface containing, more info about the current request, the error that caused the retry and the try number. If this function returns an error, the retry procedure will be interupted and this error will be returns to the caller of the operation.

type RetryInfo added in v1.61.0 

type RetryInfo interface {
	Err() error
	Context() Context
	Try() int
}

A RetryInfo is the interface that can be passed to RetryFunc that will contain retry information. Content will depend on the manipulator implementation.

type Subscriber 

type Subscriber interface {

	// Start connects to the websocket and starts collecting events
	// until the given context is canceled or any non communication error is
	// received. The eventual error will be received in the Errors() channel.
	// If not nil, the given filter will be applied right away.
	Start(context.Context, *elemental.PushFilter)

	// UpdateFilter updates the current filter.
	UpdateFilter(*elemental.PushFilter)

	// Events returns the events channel.
	Events() chan *elemental.Event

	// Errors returns the errors channel.
	Errors() chan error

	// Status returns the status channel.
	Status() chan SubscriberStatus
}

A Subscriber is the interface to control a push event subscription.

type SubscriberStatus 

type SubscriberStatus int

SubscriberStatus is the type of a subscriber status. 

const (
	SubscriberStatusInitialConnection SubscriberStatus = iota + 1
	SubscriberStatusInitialConnectionFailure
	SubscriberStatusReconnection
	SubscriberStatusReconnectionFailure
	SubscriberStatusDisconnection
	SubscriberStatusFinalDisconnection
	SubscriberStatusTokenRenewal
)

Various values of SubscriberEvent.

type TokenManager 

type TokenManager interface {

	// Issues isses a new token.
	Issue(context.Context) (string, error)

	// Run runs the token renewal job and published the new token in the
	// given channel.
	Run(ctx context.Context, tokenCh chan string)
}

A TokenManager issues an renew tokens periodically.

type TransactionID 

type TransactionID string

TransactionID is the type used to define a transcation ID of a store

func NewTransactionID 

func NewTransactionID() TransactionID

NewTransactionID returns a new transaction ID.

type TransactionalManipulator 

type TransactionalManipulator interface {

	// Commit commits the given TransactionID.
	Commit(id TransactionID) error

	// Abort aborts the give TransactionID. It returns true if
	// a transaction has been effectively aborted, otherwise it returns false.
	Abort(id TransactionID) bool

	Manipulator
}

A TransactionalManipulator is a Manipulator that handles transactions.

type WriteConsistency 

type WriteConsistency string

WriteConsistency represents the desired consistency of the request. Not all driver may implement this. 

const (
	WriteConsistencyDefault   WriteConsistency = "default"
	WriteConsistencyNone      WriteConsistency = "none"
	WriteConsistencyStrong    WriteConsistency = "strong"
	WriteConsistencyStrongest WriteConsistency = "strongest"
)

Various values for Consistency

Source Files

View all Source files

Directories

Path Synopsis
internal
backoff
idempotency
push
snip
tracing
Package maniphttp provides a ReST backed Manipulator.
 Package maniphttp provides a ReST backed Manipulator.
internal/compiler
Package manipmemory provides a go-memdb backed Manipulator.
 Package manipmemory provides a go-memdb backed Manipulator.
Package manipmongo provides a MongoDB backed TransactionalManipulator.
 Package manipmongo provides a MongoDB backed TransactionalManipulator.
internal/compiler
Package maniptest contains a Mockable TransactionalManipulator.
 Package maniptest contains a Mockable TransactionalManipulator.
Package manipvortex contains a Manipulator that can be used as cache in front of another Manipulator.
 Package manipvortex contains a Manipulator that can be used as cache in front of another Manipulator.

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