Package io.ably.lib.rest

Class ChannelBase.Presence

java.lang.Object

io.ably.lib.rest.ChannelBase.Presence

Enclosing class:

ChannelBase

public class ChannelBase.Presence
extends java.lang.Object

Enables the retrieval of the current and historic presence set for a channel.

Constructor Summary

Constructors

Constructor	Description
Presence()

Method Summary

Modifier and Type	Method	Description
PaginatedResult<PresenceMessage>	get(Param[] params)	Retrieves the current members present on the channel and the metadata for each member, such as their PresenceMessage.Action and ID.
void	getAsync(Param[] params, Callback<AsyncPaginatedResult<PresenceMessage>> callback)	Asynchronously retrieves the current members present on the channel and the metadata for each member, such as their PresenceMessage.Action and ID.
PaginatedResult<PresenceMessage>	history(Param[] params)	Retrieves a PaginatedResult object, containing an array of historical PresenceMessage objects for the channel.
void	historyAsync(Param[] params, Callback<AsyncPaginatedResult<PresenceMessage>> callback)	Asynchronously retrieves a PaginatedResult object, containing an array of historical PresenceMessage objects for the channel.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

Presence

public Presence()

Method Detail

get

public PaginatedResult<PresenceMessage> get(Param[] params)
                                     throws AblyException

Retrieves the current members present on the channel and the metadata for each member, such as their PresenceMessage.Action and ID. Returns a PaginatedResult object, containing an array of PresenceMessage objects.

Spec: RSPa

Parameters:

params - the request params:

limit (RSP3a) - An upper limit on the number of messages returned. The default is 100, and the maximum is 1000.

clientId (RSP3a2) - Filters the list of returned presence members by a specific client using its ID.

connectionId (RSP3a3) - Filters the list of returned presence members by a specific connection using its ID.

Returns:

A PaginatedResult object containing an array of PresenceMessage objects.

Throws:

AblyException

getAsync

public void getAsync(Param[] params,
                     Callback<AsyncPaginatedResult<PresenceMessage>> callback)

Asynchronously retrieves the current members present on the channel and the metadata for each member, such as their PresenceMessage.Action and ID. Returns a PaginatedResult object, containing an array of PresenceMessage objects.

Spec: RSPa

Parameters:

params - the request params:

limit (RSP3a) - An upper limit on the number of messages returned. The default is 100, and the maximum is 1000.

clientId (RSP3a2) - Filters the list of returned presence members by a specific client using its ID.

connectionId (RSP3a3) - Filters the list of returned presence members by a specific connection using its ID.

callback - A Callback returning AsyncPaginatedResult object containing an array of PresenceMessage objects.

This callback is invoked on a background thread.

history

public PaginatedResult<PresenceMessage> history(Param[] params)
                                         throws AblyException

Retrieves a PaginatedResult object, containing an array of historical PresenceMessage objects for the channel. If the channel is configured to persist messages, then presence messages can be retrieved from history for up to 72 hours in the past. If not, presence messages can only be retrieved from history for up to two minutes in the past.

Spec: RSP4a

Parameters:

params - the request params:

start (RSP4b1) - The time from which messages are retrieved, specified as milliseconds since the Unix epoch.

end (RSP4b1) - The time until messages are retrieved, specified as milliseconds since the Unix epoch.

direction (RSP4b2) - The order for which messages are returned in. Valid values are backwards which orders messages from most recent to oldest, or forwards which orders messages from oldest to most recent. The default is backwards. limit (RSP4b3) - An upper limit on the number of messages returned. The default is 100, and the maximum is 1000.

Returns:

A PaginatedResult object containing an array of PresenceMessage objects.

Throws:

AblyException

historyAsync

public void historyAsync(Param[] params,
                         Callback<AsyncPaginatedResult<PresenceMessage>> callback)

Asynchronously retrieves a PaginatedResult object, containing an array of historical PresenceMessage objects for the channel. If the channel is configured to persist messages, then presence messages can be retrieved from history for up to 72 hours in the past. If not, presence messages can only be retrieved from history for up to two minutes in the past.

Spec: RSP4a

Parameters:

params - the request params:

start (RSP4b1) - The time from which messages are retrieved, specified as milliseconds since the Unix epoch.

end (RSP4b1) - The time until messages are retrieved, specified as milliseconds since the Unix epoch.

direction (RSP4b2) - The order for which messages are returned in. Valid values are backwards which orders messages from most recent to oldest, or forwards which orders messages from oldest to most recent. The default is backwards. limit (RSP4b3) - An upper limit on the number of messages returned. The default is 100, and the maximum is 1000.

callback - A Callback returning AsyncPaginatedResult object containing an array of PresenceMessage objects.

This callback is invoked on a background thread.

Throws:

AblyException