net.kuujo.vertigo.io.selector

Interface Selector

All Superinterfaces:

JsonSerializable

All Known Implementing Classes:

AllSelector, CustomSelector, FairSelector, HashSelector, RandomSelector, RoundRobinSelector

public interface Selector
extends JsonSerializable

Connection selector.

Connection selectors are used to route messages between multiple instances of a component. When a message is sent on an output stream, the stream's selector will select a connection or set of connections to which to copy the message.

Vertigo supports custom selector implementations. To implement a custom selector, simply implement the Selector interface as any selector implementation does.

Author:

Jordan Halterman

Field Summary

Fields

Modifier and Type	Field and Description
static String	ALL all is a selector that routes messages to all connections.
static String	CUSTOM custom indicates a custom selector.
static String	FAIR fair is a selector that selects connections based on lowest queue size.
static String	HASH hash is a mod-hash based connection selector.
static String	RANDOM random is a random connection selector.
static String	ROUND_ROBIN round-robin is a round robin connection selector.

Method Summary

Methods

Modifier and Type	Method and Description
<T extends Connection> List<T>	select(Object message, List<T> connections) Selects a list of connections to which to send a message.

Field Detail

ROUND_ROBIN

static final String ROUND_ROBIN

round-robin is a round robin connection selector.

See Also:

Constant Field Values

RANDOM

static final String RANDOM

random is a random connection selector.

See Also:

Constant Field Values

HASH

static final String HASH

hash is a mod-hash based connection selector.

See Also:

Constant Field Values

FAIR

static final String FAIR

fair is a selector that selects connections based on lowest queue size.

See Also:

Constant Field Values

ALL

static final String ALL

all is a selector that routes messages to all connections.

See Also:

Constant Field Values

CUSTOM

static final String CUSTOM

custom indicates a custom selector.

See Also:

Constant Field Values

Method Detail

select

<T extends Connection> List<T> select(Object message,
                                    List<T> connections)

Selects a list of connections to which to send a message.

Parameters:

message - The message being sent.

targets - A list of connections from which to select.

Returns:

A list of selected connections.