Channels
Our channels enable developers to implement different types of chat messaging capabilities into their applications easily
Users can create and join channels where they will be able to participate and chat with other users. A channel can support up to 300,000 members and can contain an unlimited number of messages. Any message exchanged in the channels will be pushed to all other members of the channel in real-time.
Amity's Chat SDK supports the creations of 4 types of chat channels. Each type is designed to match a particular use-case for chat channels. Here's a table showing what features each channel offers:
Channel Types
Channel Type | Discoverable by | Message sending privileges | Moderation access |
Community | All users and admins | Users and admins | All Moderation tools |
Live | Only members and admins | Users and admins | All Moderation tools |
Broadcast | All users and admins | Admins | Admin Moderation tools |
Conversation | Only members | Users | No Moderation tools |
Community
All community channels are visible on the Amity Social Cloud Console.
The community channel is our default channel type and can be discovered by all users and admins. It acts as a public chat channel that showcases all of the features that our SDK's have to offer.
Typical use cases:
Team collaboration
Online gaming
Celebrity fan club
Live streaming
Any type of public chat
Live
All live channels are visible on the Amity Social Cloud Console.
Live channels offers the ability for users and admins to create channels with exclusive memberships. The live channel is identical to our Community channel in features with the caveat that users will not be able to discover the channel when querying for all channels unless they are already a member of it. However users and admins can still invite other users to join the channel.
Typical use cases:
Healthcare
Project Discussion
Any type of private chat
Community and Live channel types can use our SDK moderation tools:
Message and user flagging
Muting/Unmuting users
Banning/Unbanning users from channel
Profanity filters
Whitelisted URLs
User rate-limiting
Broadcast
All broadcast channels are visible on the Amity Social Cloud Console.
The Broadcast channel is heavily adopted by corporate users who constantly promote or advertise their products, or make the announcement to drive awareness. Unlink other channel types, broadcast channels only allow admin users to send messages from Console, and everyone else in the channel will be under read-only mode.
Since this is a one-way communication channel, a tailored moderation tools are provided as well, for instance, users won't be able to flag message / user in the channel.
Typical use cases:
Marketing & Advertising
School / Government Announcements
Conversation
Conversation channels are NOT visible on the Amity Social Cloud Console.
The Conversation channel is our solution to 1-on-1 messaging. Unlike the other channel types, a Conversation channel can be created simply by knowing the userId of the user we want to converse with. Users can start conversations with any other user and only they will be able to see their conversation.
There are no moderation tools for Conversation channels, users will be able to converse freely with no oversight!
Typical use cases:
Hospitality
Financial Consultancy
Customer Support
Channel Members
When a user joins a channel, they are able to observe and chat with other users in that channel. They are also automatically considered a member of that channel. The Chat SDK provides the ability to view which users are currently in the channel as well as invite other users to join the channel.
Each channel is identified by a unique channelId
, which is any string that uniquely identifies the channel and is immutable through its lifetime. When creating channels, you can specify your own channelId
, or leave it to Amity's Chat SDK to automatically generate one for you.
It's important to note that, createChannel:
guarantees that the requested channel is a new channel, whereas joinChannel:
will attempt to join an existing channel. If there is a requirement to create a new channel, then use of createChannel:
then call joinChannel:
. Lastly calling getChannel:
only gives you back the channel LiveObject, but it won't make the current user join said channel.
Channel management methods are contained in a EkoChannelRepository
class. Before being able to call any channel method, you must initialize a repository instance using the EkoClient
instance you created during setup:
Create Channel
EkoChannelRepository
provides createChannel()
method to create a new channel. It supports creating of 3 types of channels Community
, Live
and Conversation
. Each channel type has specific builder classes which helps you to create that particular channel. Build your channel information first and then create the particular channel.
The above code creates a channel and notifies you through the observer block. It first instantiates the EkoChannelRepository
, a class that contain all channel related methods. Then it calls createChannel:
to obtain the LiveObject and observe it in order to obtain the final channel model.
The
EkoNotificationToken
returned by theobserve:
is saved inself.channelToken
, a strongly referenced property. This is needed in order to prevent the observe block from being released. You should note that this block can get called multiple times, when the underlying data for the channel updates. If you don't want to get notified, you can callchannelToken.invalidate()
. As soon as the token gets invalidated, observer is automatically removed from that channel.In the case that there is already an existing channel with the same
channelID
, the LiveObject will notify you with anerror
.The
channelId
parameter increateChannel:
can benil
: when this happens, the SDK will generate a uniquechannelId
for this channel, ensuring no unique ID conflicts.3 channel types can be created through SDK i.e
Community
,Live
andConversation
. Creation ofPrivate
andStandard
type has been removed. Creation ofBroadcast
channel type is not supported through the SDK. But for query,channelCollection:
method supports all channel types includingBroadcast
,Private
andStandard
.
Create Conversation
The Chat SDK provides a convenient createConversation:
method which creates a conversation channel type. You can use either createChannel
or createConversation
method directly as well.
Conversation channel is unique based on its membership. When creating conversation the system will check if channel with the same membership already exists, if such channel already exists the system will return existing channel instead of creating a new one.
Join Channel
joinChannel:
is an idempotent method, this means it can be called multiple times throughout the lifecycle of the application, and you can expect this method to always return the same channel. Because of this, you can also use joinChannel:
any time you need to fetch a channel, even if you know the user may already be in the channel.
Get Channel
In the case where you'd like to fetch a channel's data without joining, the getChannel:
method can be used:
Channel Query
EkoChannelRepository
provides a way to query list of channels using channelCollection()
method. It returns a EkoCollection
of all the matching channels available. This live collection returned will automatically update and notify you on any channel modifications as well.
SDK provides with 7 builder classes. EkoStandardChannelQueryBuilder
, EkoPrivateChannelQueryBuilder
, EkoByTypesChannelQueryBuilder
, EkoBroadcastChannelQueryBuilder
, EkoConversationChannelQueryBuilder
, EkoCommunityChannelQueryBuilder
and EkoLiveChannelQueryBuilder
. These builder classes should be used to construct a query and then used alongside channelCollection method to fetch list of channels.
Depreciated:
channelsForFilter()
,channelsForFilter(_:includingTags:excludingTags:)
method to query channels is now depreciated. SDK now does not support creation of Private & Standard channels but still supports query usingEkoStandardChannelQueryBuilder
EkoPrivateChannelQueryBuilder
.
If you use a UITableView
or UICollectionView
to display channel list data, the ideal location to reload table data is directly in the observe block of the LiveObject that you are displaying, as shown in the example above.
Channel Filtering
You can filter channels by various criteria such as includingTags, excludingTags, includeDeleted channels etc. All these filters are available in QueryBuilder classes for channel.
Metadata
Metadata is a general purpose data store that is automatically synchronized to all the channel members. It is meant as an elegant mechanism to store contextual information about a specific channel. The data can be any number of JSON key value pairs up to 100 kb. Example use cases include:
Conversation title or cover photo
Global conversation settings
Metadata is implemented with last writer wins semantics: multiple mutations by independent users to the metadata object will result in a single stored value. No locking, merging, or other coordination is performed across multiple writes on the data.
To set metadata, call the setMetadataForChannel:
method:
The completion block will be triggered with the outcome of the request. The latest metadata of the channel is always exposed as part of the metadata
property on the channel model.
Display Name
Every channel contains an optional displayName
property. This property is mainly used to identify the channel in push notifications, but it is also exposed to the application via EkoChannel
object.
You can set a channel's displayName
with the following method:
An optional completion callback is available to inform you on whether the request has succeeded or not.
Participation
All participation related methods in a channel falls under a separate EkoChannelParticipation
class. Before calling any participation methods, you must ensure to first instantiate a repository instance using the EkoClient
instance you created on setup and a valid channelId
:
Members Query
The participation membership provides a list of all members in the given channel as a LiveObject.
You can also get a list of channel members with specific roles, membership types etc. EkoChannelParticipation
class provides membershipsForFilter:
method which accepts filter
, sortBy
and roles
as parameter.
Manage Members
The participation membership also provides classes to add and remove members, as well as removing yourself as a member of the channel (leaving the channel).
Reading Status And Unread Count
The EkoChannelRepository
object exposes an totalUnreadCount
property that reflects the number of messages that the current user has yet to read. This count is the sum of all the unreadCount
channels properties where the user is already a member.
To let the server know when the current user is reading one channel, hence resetting that channel unreadCount
to zero, the participation membership exposes the startReading
and stopReading
methods.
You can call both methods as much you'd like, the SDK takes care of multi-device management: therefore a user can read multiple channels, from one or multiple devices at the same time. In case of an abrupt disconnection (whether because the app was killed, or the internet went down etc.) the SDK backend will automatically call the stopReading
on the users behalf.
Moderation
EkoChannelModeration
class provides various methods to moderate the users present in any given channel. You can ban/unban/mute users, assign roles or remove it from user.
Permission
You can check your permission in channel using hasPermission(permission:forChannel:_:)
method from EkoClient.
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