broker

package
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 Go to latest Published: Jan 23, 2019 License: MIT Imports: 8 Imported by: 4

Documentation

Overview

Package broker implements types used for routing inputs to outputs in non-trivial arrangements, such as fan-out or fan-in models.

Index

Constants

This section is empty.

Variables

This section is empty.

Functions

func OptDynamicFanInSetOnAdd added in v0.8.0 

func OptDynamicFanInSetOnAdd(onAddFunc func(label string)) func(*DynamicFanIn)

OptDynamicFanInSetOnAdd sets the function that is called whenever a dynamic input is added.

func OptDynamicFanInSetOnRemove added in v0.8.0 

func OptDynamicFanInSetOnRemove(onRemoveFunc func(label string)) func(*DynamicFanIn)

OptDynamicFanInSetOnRemove sets the function that is called whenever a dynamic input is removed.

func OptDynamicFanOutSetOnAdd added in v0.8.0 

func OptDynamicFanOutSetOnAdd(onAddFunc func(label string)) func(*DynamicFanOut)

OptDynamicFanOutSetOnAdd sets the function that is called whenever a dynamic output is added.

func OptDynamicFanOutSetOnRemove added in v0.8.0 

func OptDynamicFanOutSetOnRemove(onRemoveFunc func(label string)) func(*DynamicFanOut)

OptDynamicFanOutSetOnRemove sets the function that is called whenever a dynamic output is removed.

Types

type DynamicFanIn added in v0.8.0 

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

DynamicFanIn is a broker that implements types.Producer and manages a map of inputs to unique string identifiers, routing them through a single message channel. Inputs can be added and removed dynamically as the broker runs.

func NewDynamicFanIn added in v0.8.0 

func NewDynamicFanIn(
	inputs map[string]DynamicInput,
	logger log.Modular,
	stats metrics.Type,
	options ...func(*DynamicFanIn),
) (*DynamicFanIn, error)

NewDynamicFanIn creates a new DynamicFanIn type by providing an initial map map of inputs.

func (*DynamicFanIn) CloseAsync added in v0.8.0 

func (d *DynamicFanIn) CloseAsync()

CloseAsync shuts down the DynamicFanIn broker and stops processing requests.

func (*DynamicFanIn) Connected added in v0.39.0 

func (d *DynamicFanIn) Connected() bool

Connected returns a boolean indicating whether this output is currently connected to its target.

func (*DynamicFanIn) SetInput added in v0.8.0 

func (d *DynamicFanIn) SetInput(ident string, input DynamicInput, timeout time.Duration) error

SetInput attempts to add a new input to the dynamic input broker. If an input already exists with the same identifier it will be closed and removed. If either action takes longer than the timeout period an error will be returned.

A nil input is safe and will simply remove the previous input under the indentifier, if there was one.

func (*DynamicFanIn) TransactionChan added in v0.9.0 

func (d *DynamicFanIn) TransactionChan() <-chan types.Transaction

TransactionChan returns the channel used for consuming messages from this broker.

func (*DynamicFanIn) WaitForClose added in v0.8.0 

func (d *DynamicFanIn) WaitForClose(timeout time.Duration) error

WaitForClose blocks until the DynamicFanIn broker has closed down.

type DynamicFanOut added in v0.8.0 

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

DynamicFanOut is a broker that implements types.Consumer and broadcasts each message out to a dynamic map of outputs.

func NewDynamicFanOut added in v0.8.0 

func NewDynamicFanOut(
	outputs map[string]DynamicOutput,
	logger log.Modular,
	stats metrics.Type,
	options ...func(*DynamicFanOut),
) (*DynamicFanOut, error)

NewDynamicFanOut creates a new DynamicFanOut type by providing outputs.

func (*DynamicFanOut) CloseAsync added in v0.8.0 

func (d *DynamicFanOut) CloseAsync()

CloseAsync shuts down the DynamicFanOut broker and stops processing requests.

func (*DynamicFanOut) Connected added in v0.39.0 

func (d *DynamicFanOut) Connected() bool

Connected returns a boolean indicating whether this output is currently connected to its target.

func (*DynamicFanOut) Consume added in v0.19.0 

func (d *DynamicFanOut) Consume(transactions <-chan types.Transaction) error

Consume assigns a new transactions channel for the broker to read.

func (*DynamicFanOut) SetOutput added in v0.8.0 

func (d *DynamicFanOut) SetOutput(ident string, output DynamicOutput, timeout time.Duration) error

SetOutput attempts to add a new output to the dynamic output broker. If an output already exists with the same identifier it will be closed and removed. If either action takes longer than the timeout period an error will be returned.

A nil output argument is safe and will simply remove the previous output under the indentifier, if there was one.

func (*DynamicFanOut) WaitForClose added in v0.8.0 

func (d *DynamicFanOut) WaitForClose(timeout time.Duration) error

WaitForClose blocks until the DynamicFanOut broker has closed down.

type DynamicInput added in v0.8.0 

type DynamicInput interface {
	types.Producer
	types.Closable
}

DynamicInput is an interface of input types that must be closable.

type DynamicOutput added in v0.8.0 

type DynamicOutput interface {
	types.Consumer
	types.Closable
}

DynamicOutput is an interface of output types that must be closable.

type FanIn 

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

FanIn is a broker that implements types.Producer, takes an array of inputs and routes them through a single message channel.

func NewFanIn 

func NewFanIn(inputs []types.Producer, stats metrics.Type) (*FanIn, error)

NewFanIn creates a new FanIn type by providing inputs.

func (*FanIn) CloseAsync 

func (i *FanIn) CloseAsync()

CloseAsync shuts down the FanIn broker and stops processing requests.

func (*FanIn) Connected added in v0.39.0 

func (i *FanIn) Connected() bool

Connected returns a boolean indicating whether this output is currently connected to its target.

func (*FanIn) TransactionChan added in v0.9.0 

func (i *FanIn) TransactionChan() <-chan types.Transaction

TransactionChan returns the channel used for consuming transactions from this broker.

func (*FanIn) WaitForClose 

func (i *FanIn) WaitForClose(timeout time.Duration) error

WaitForClose blocks until the FanIn broker has closed down.

type FanOut 

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

FanOut is a broker that implements types.Consumer and broadcasts each message out to an array of outputs.

func NewFanOut 

func NewFanOut(
	outputs []types.Output, logger log.Modular, stats metrics.Type,
) (*FanOut, error)

NewFanOut creates a new FanOut type by providing outputs.

func (*FanOut) CloseAsync 

func (o *FanOut) CloseAsync()

CloseAsync shuts down the FanOut broker and stops processing requests.

func (*FanOut) Connected added in v0.39.0 

func (o *FanOut) Connected() bool

Connected returns a boolean indicating whether this output is currently connected to its target.

func (*FanOut) Consume added in v0.19.0 

func (o *FanOut) Consume(transactions <-chan types.Transaction) error

Consume assigns a new transactions channel for the broker to read.

func (*FanOut) WaitForClose 

func (o *FanOut) WaitForClose(timeout time.Duration) error

WaitForClose blocks until the FanOut broker has closed down.

type Greedy added in v0.9.0 

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

Greedy is a broker that implements types.Consumer and sends each message out to a single consumer chosen from an array in round-robin fashion. Consumers that apply backpressure will block all consumers.

func NewGreedy added in v0.9.0 

func NewGreedy(outputs []types.Output) (*Greedy, error)

NewGreedy creates a new Greedy type by providing consumers.

func (*Greedy) CloseAsync added in v0.9.0 

func (g *Greedy) CloseAsync()

CloseAsync shuts down the Greedy broker and stops processing requests.

func (*Greedy) Connected added in v0.39.0 

func (g *Greedy) Connected() bool

Connected returns a boolean indicating whether this output is currently connected to its target.

func (*Greedy) Consume added in v0.19.0 

func (g *Greedy) Consume(ts <-chan types.Transaction) error

Consume assigns a new messages channel for the broker to read.

func (*Greedy) WaitForClose added in v0.9.0 

func (g *Greedy) WaitForClose(timeout time.Duration) error

WaitForClose blocks until the Greedy broker has closed down.

type MockType 

type MockType struct {
}

MockType implements the broker.Type interface.

func (MockType) CloseAsync 

func (m MockType) CloseAsync()

CloseAsync does nothing.

func (MockType) WaitForClose 

func (m MockType) WaitForClose(time.Duration) error

WaitForClose does nothing.

type RoundRobin 

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

RoundRobin is a broker that implements types.Consumer and sends each message out to a single consumer chosen from an array in round-robin fashion. Consumers that apply backpressure will block all consumers.

func NewRoundRobin 

func NewRoundRobin(outputs []types.Output, stats metrics.Type) (*RoundRobin, error)

NewRoundRobin creates a new RoundRobin type by providing consumers.

func (*RoundRobin) CloseAsync 

func (o *RoundRobin) CloseAsync()

CloseAsync shuts down the RoundRobin broker and stops processing requests.

func (*RoundRobin) Connected added in v0.39.0 

func (o *RoundRobin) Connected() bool

Connected returns a boolean indicating whether this output is currently connected to its target.

func (*RoundRobin) Consume added in v0.19.0 

func (o *RoundRobin) Consume(ts <-chan types.Transaction) error

Consume assigns a new messages channel for the broker to read.

func (*RoundRobin) WaitForClose 

func (o *RoundRobin) WaitForClose(timeout time.Duration) error

WaitForClose blocks until the RoundRobin broker has closed down.

type Try added in v0.14.0 

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

Try is a broker that implements types.Consumer and attempts to send each message to a single output, but on failure will attempt the next output in the list.

func NewTry added in v0.14.0 

func NewTry(outputs []types.Output, stats metrics.Type) (*Try, error)

NewTry creates a new Try type by providing consumers.

func (*Try) CloseAsync added in v0.14.0 

func (t *Try) CloseAsync()

CloseAsync shuts down the Try broker and stops processing requests.

func (*Try) Connected added in v0.39.0 

func (t *Try) Connected() bool

Connected returns a boolean indicating whether this output is currently connected to its target.

func (*Try) Consume added in v0.19.0 

func (t *Try) Consume(ts <-chan types.Transaction) error

Consume assigns a new messages channel for the broker to read.

func (*Try) WaitForClose added in v0.14.0 

func (t *Try) WaitForClose(timeout time.Duration) error

WaitForClose blocks until the Try broker has closed down.

Source Files

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