History
- Channel
- Presence
- Related types
Channel object
The Realtime Channel
object exposes the following public method to obtain Message
history.
Methods
historyHistory
history(Object option, callback(ErrorInfo err, PaginatedResult<Message> resultPage))Deferrable history(Hash option) → yields PaginatedResult<Message>PaginatedResult<Message> history(Param[] option)history(query: ARTRealtimeHistoryQuery?, callback: (ARTPaginatedResult<ARTMessage>?, ARTErrorInfo?) → Void) throwsTask<PaginatedResult
> HistoryAsync(HistoryRequestParams dataQuery, bool untilAttach = false);
Gets a paginated set of historical messages for this channel.
Parameters
- optionqueryParam[] optionHistoryRequestParams query
- an optional object containing the query parametersan optional set of key value pairs containing the query parameters, as specified below.
- callback
- is a function of the form:
function(err, resultPage)
- &block
- yields a
PaginatedResult<Message>
object - callback
- called with a ARTPaginatedResult<ARTMessage> object or an error
options
parametersARTRealtimeHistoryQuery
propertiesHistoryRequestParams
properties
- start:startStart
-
beginning of time earliest
DateTimeOffset
orTime
or time in milliseconds since the epoch for any messages retrieved
Type:Long
Int or @Time
DateTimeOffset
- end:endEnd
-
current time latest
DateTimeOffset
orTime
or time in milliseconds since the epoch for any messages retrieved
Type:Long
Int or @Time
DateTimeOffset
- direction:directionDirection
-
backwards
:
forwards
or:
backwards
Type:String
Symbol
Direction
enum - limit:limitLimit
-
100 maximum number of messages to retrieve up to 1,000
Type:Integer
- untilAttach:until_attach
-
false when true, ensures message history is up until the point of the channel being attached. See continuous history for more info. If the
Channel
is not attached, enabling this option will result in error
Type:Boolean
Callback result
On success, resultPage
contains a PaginatedResult
encapsulating an array of Message
objects corresponding to the current page of results. PaginatedResult
supports pagination using next()
and first()
methods.
On failure to retrieve message history, err
contains an ErrorInfo
object with the failure reason.
Returns
On success, the returned PaginatedResult
encapsulates an array of Message
objects corresponding to the current page of results. PaginatedResult
supports pagination using next
and first
methods.
Failure to retrieve the message history will raise an AblyException
Returns
Returns a Task
that needs to be awaited.
On success, the returned PaginatedResult
encapsulates an array of Message
objects corresponding to the current page of results. PaginatedResult
supports pagination using NextAsync
and FirstAsync
methods.
Failure to retrieve the message history will raise an AblyException
Returns
A Deferrable
object is returned from the method.
On success, the registered success blocks for the Deferrable
and any block provided to the method yield a PaginatedResult that encapsulates an array of Message
objects corresponding to the current page of results. PaginatedResult
supports pagination using next()
and first()
methods.
Failure to retrieve the message history will trigger the errback
callbacks of the Deferrable
with an ErrorInfo
object with the failure reason.
Presence object
Realtime Presence
object exposes the following public method to obtain presence event history such as enter, update and leave events. These events are represented as PresenceMessage
objects.
Methods
historyHistory
history(Object option, callback(ErrorInfo err, PaginatedResult<PresenceMessage> resultPage))Deferrable history(Hash option) → yields PaginatedResult<PresenceMessage>PaginatedResult<PresenceMessage> history(Param[] option)history(query: ARTRealtimeHistoryQuery?, callback: (ARTPaginatedResult<ARTPresenceMessage>?, ARTErrorInfo?) → Void) throwsTask<PaginatedResult<PresenceMessage>> HistoryAsync(HistoryRequestParams query, bool untilAttach = false)
Gets a paginated set of historical presence events for this channel.
Parameters
- optionqueryParam[] optionHistoryRequestParams query
- an optional object containing the query parametersan optional set of key value pairs containing the query parameters, as specified below.
- callback
- is a function of the form:
function(err, resultPage)
- &block
- yields a
PaginatedResult<PresenceMessage>
object - callback
- called with a ARTPaginatedResult<ARTPresenceMessage> object or an error
options
parametersARTRealtimeHistoryQuery
propertiesHistoryRequestParams
properties
- start:startStart
-
beginning of time earliest
DateTimeOffset
orTime
or time in milliseconds since the epoch for any presence events retrieved
Type:Long
Int or @Time
DateTimeOffset
- end:endEnd
-
current time latest
DateTimeOffset
orTime
or time in milliseconds since the epoch for any presence events retrieved
Type:Long
Int or @Time
DateTimeOffset
- direction:directionDirection
-
backwards
:
forwards
or:
backwards
Type:String
Symbol
Direction
enum - limit:limitLimit
-
100 maximum number of presence events to retrieve up to 1,000
Type:Integer
- untilAttach:until_attach
-
false when true, ensures presence event history is up until the point of the channel being attached. See continuous history for more info. If the
Channel
is not attached, enabling this option will result in error
Type:Boolean
Callback result
On success, resultPage
contains a PaginatedResult
encapsulating an array of PresenceMessage
objects corresponding to the current page of results. PaginatedResult
supports pagination using next()
and first()
methods.
On failure to retrieve presence event history, err
contains an ErrorInfo
object with the failure reason.
Returns
On success, the returned PaginatedResult
encapsulates an array of PresenceMessage
objects corresponding to the current page of results. PaginatedResult
supports pagination using next
and first
methods.
Failure to retrieve the presence event history will raise an AblyException
Returns
Returns a Task
that needs to be awaited.
On success, the returned PaginatedResult
encapsulates an array of PresenceMessage
objects corresponding to the current page of results. PaginatedResult
supports pagination using NextAsync
and FirstAsync
methods.
Failure to retrieve the presence event history will raise an AblyException
Returns
A Deferrable
object is returned from the method.
On success, the registered success blocks for the Deferrable
and any block provided to the method yield a PaginatedResult that encapsulates an array of PresenceMessage
objects corresponding to the current page of results. PaginatedResult
supports pagination using next()
and first()
methods.
Failure to retrieve the presence event history will trigger the errback
callbacks of the Deferrable
with an ErrorInfo
object with the failure reason.
Related types
MessageARTMessageAbly::Models::Message Enumio.ably.lib.types.MessageIO.Ably.Message
A Message
represents an individual message that is sent to or received from Ably.
PropertiesMembersAttributesAttributes
- nameName
- Event name, if provided
Type:String
- data
- The message payload, if provided
Type:String
,StringBuffer
,JSON Object
- data
- The message payload, if provided
Type:String
,ByteArray
,JSONObject
,JSONArray
- Data
- The message payload, if provided
Type:String
,byte[]
, plain C# object that can be serialized to Json - data
- The message payload, if provided
Type:String
,Binary
(ASCII-8BIT String),Hash
,Array
- data
- The message payload, if provided
Type:String
,Bytearray
,Dict
,List
- data
- The message payload, if provided
Type:String
,Binary String
,Associative Array
,Array
- data
- The message payload, if provided
Type:NSString *
,NSData *
,NSDictionary *
,NSArray *
- data
- The message payload, if provided
Type:String
,NSData
,Dictionary
,Array
- idId
- Unique ID assigned by Ably to this message
Type:String
- clientIdclient_idClientId
- The client ID of the publisher of this message
Type:String
- connectionIdconnection_idConnectionId
- The connection ID of the publisher of this message
Type:String
- timestampTimestamp
- Timestamp when the presence update was received by the Ably the realtime service, as milliseconds since the epocha
Time
object
Type:Integer
Long Integer
DateTimeOffset
Time
NSDate
- encodingEncoding
- This will typically be empty as all messages received from Ably are automatically decoded client-side using this value. However, if the message encoding cannot be processed, this attribute will contain the remaining transformations not applied to the
data
payload
Type:String
PresenceMessageARTPresenceMessageAbly::Models::PresenceMessage Enumio.ably.lib.types.PresenceMessageIO.Ably.PresenceMessage
A PresenceMessage
represents an individual presence update that is sent to or received from Ably.
PropertiesMembersAttributes
- action
- the event signified by a PresenceMessage. See
PresenceMessage.action
Type:enum { ABSENT, PRESENT, ENTER, LEAVE, UPDATE }
- Action
- the event signified by a PresenceMessage. See
PresenceMessage.action
Type:enum { Absent, Present, Enter, Leave, Update }
- action
- the event signified by a PresenceMessage. See
Presence action
Type:int enum { ABSENT, PRESENT, ENTER, LEAVE, UPDATE }
- action
- the event signified by a PresenceMessage. See
PresenceAction
Type:int enum { ABSENT, PRESENT, ENTER, LEAVE, UPDATE }
- action
- the event signified by a PresenceMessage. See
PresenceMessage::ACTION
Type:enum { :absent, :present, :enter, :leave, :update }
- action
- the event signified by a PresenceMessage. See
PresenceMessage::ACTION
Type:const PresenceMessage::ABSENT,PRESENT,ENTER,LEAVE,UPDATE
- action
- the event signified by a PresenceMessage. See
PresenceMessage.action
Type:ARTPresenceAction
- data
- The presence update payload, if provided
Type:String
,ByteArray
,JSONObject
,JSONArray
- Data
- The presence update payload, if provided
Type:String
,byte[]
, plain C# object that can be converted to Json - data
- The presence update payload, if provided
Type:String
,StringBuffer
,JSON Object
- data
- The presence update payload, if provided
Type:String
,Binary
(ASCII-8BIT String),Hash
,Array
- data
- The presence update payload, if provided
Type:String
,Bytearray
,Dict
,List
- data
- The message payload, if provided
Type:String
,NSData
,Dictionary
,Array
- data
- The message payload, if provided
Type:NSString *
,NSData *
,NSDictionary *
,NSArray *
- data
- The message payload, if provided
Type:String
,Binary String
,Associative Array
,Array
- idId
- Unique ID assigned by Ably to this presence update
Type:String
- clientIdclient_idClientId
- The client ID of the publisher of this presence update
Type:String
- connectionIdconnection_idConnectionId
- The connection ID of the publisher of this presence update
Type:String
- timestampTimestamp
- Timestamp when the presence update was received by the Ably the realtime service, as milliseconds since the epoch.
Type:Integer
Long Integer
DateTimeOffset
Time
NSDate
- encodingEncoding
- This will typically be empty as all presence updates received from Ably are automatically decoded client-side using this value. However, if the message encoding cannot be processed, this attribute will contain the remaining transformations not applied to the
data
payload
Type:String
Presence actionARTPresenceActionio.ably.lib.types.PresenceMessage.ActionAbly::Models::PresenceMessage::ACTIONIO.Ably.PresenceAction
Presence
action
is a String with a value matching any of the Realtime Presence
states & events.
var allPresenceActions = [
'absent', // (reserved for internal use)
'present',
'enter',
'leave',
'update'
]
io.ably.lib.types.PresenceMessage.Action
is an enum representing all the Realtime Presence
states & events.
public enum Action {
ABSENT, // 0 (reserved for internal use)
PRESENT, // 1
ENTER, // 2
LEAVE, // 3
UPDATE // 4
}
IO.Ably.PresenceAction
is an enum representing all the Realtime Presence
states & events.
public enum Action {
Absent, // 0 (reserved for internal use)
Present, // 1
Enter, // 2
Leave, // 3
Update // 4
}
PresenceAction
is an enum-like class representing all the Realtime Presence
states & events.
class PresenceAction(object):
ABSENT = 0 # (reserved for internal use)
PRESENT = 1
ENTER = 2
LEAVE = 3
UPDATE = 4
PresenceMessage Action
is one of the class constants representing all the Realtime Presence
states & events.
namespace Ably\Models;
class PresenceMessages {
const ABSENT = 0; /* (reserved for internal use) */
const PRESENT = 1;
const ENTER = 2;
const LEAVE = 3;
const UPDATE = 4;
}
Example usage
if ($presenceMessage->action == Ably\Models\PresenceMesage::ENTER) {
/* do something */
}
Ably::Models::PresenceMessage::ACTION
is an enum-like value representing all the Realtime Presence
states & events. ACTION
can be represented interchangeably as either symbols or constants.
Symbol states
:absent # => 0 (reserved for internal use)
:present # => 1
:enter # => 2
:leave # => 3
:update # => 4
Constant states
PresenceMessage::ACTION.Absent # => 0 (internal use)
PresenceMessage::ACTION.Present # => 1
PresenceMessage::ACTION.Enter # => 2
PresenceMessage::ACTION.Leave # => 3
PresenceMessage::ACTION.Update # => 4
Example usage
# Example with symbols
presence.on(:attached) { ... }
# Example with constants
presence.on(Ably::Models::PresenceMessage::ACTION.Enter) { ... }
# Interchangeable
Ably::Models::PresenceMessage::ACTION.Enter == :enter # => true
ARTPresenceAction
is an enum representing all the Realtime Presence
states & events.
typedef NS_ENUM(NSUInteger, ARTPresenceAction) {
ARTPresenceAbsent, // reserved for internal use
ARTPresencePresent,
ARTPresenceEnter,
ARTPresenceLeave,
ARTPresenceUpdate,
ARTPresenceLast
};
enum ARTPresenceAction : UInt {
case Absent // reserved for internal use
case Present
case Enter
case Leave
case Update
case Last
}
IO.Ably.HistoryRequestParams
HistoryRequestParams
is a type that encapsulates the parameters for a history queries. For example usage see Channel#history
Channel#History
.
Members
- Start
-
null The start of the queried interval
Type:DateTimeOffset
- End
-
null The end of the queried interval
Type:DateTimeOffset
- Limit
-
null By default it is null. Limits the number of items returned by history or stats
Type:Integer
- Direction
-
Backwards Enum which is either
Forwards
orBackwards
Type:Direction
enum - ExtraParameters
- Optionally any extra query parameters that may be passed to the query. This is mainly used internally by the library to manage paging.
Type:Dictionary<string, string>
PaginatedResultARTPaginatedResultAbly::Models::PaginatedResultio.ably.lib.types.PaginatedResultIO.Ably.PaginatedResult
A PaginatedResult
is a type that represents a page of results for all message and presence history, stats and REST presence requests. The response from a Ably REST API paginated query is accompanied by metadata that indicates the relative queries available to the PaginatedResult
object.
PropertiesMembersAttributesAttributes
- itemsItems
- contains a page of results (for example an Array of
Message
orPresenceMessage
objects for a channel history request)
Type:Array <Message, Presence, Stats>
Type:List <Message, Presence, Stats>
- isLast
-
true
if this page is the last page
Type:Boolean
- last?
-
true
if this page is the last page
Type:Boolean
- isLast()
-
true
if this page is the last page
Type:Boolean
- is_last()
-
True
if this page is the last page
Type:Boolean
- hasNext
-
true
if there are further pages
Type:Boolean
- HasNext
-
true
if there are further pages
Type:Boolean
- has_next?
-
true
if there are further pages
Type:Boolean
- hasNext()
-
true
if there are further pages
Type:Boolean
- has_next()
-
True
if there are further pages
Type:Boolean
Methods
firstFirst
first(callback(ErrorInfo err, PaginatedResult resultPage))PaginatedResult firstPaginatedResult first()PaginatedResult first()Task<PaginatedResult
> FirstAsync() PaginatedResult first()first(callback: (ARTPaginatedResult?, ARTErrorInfo?) → Void)
Returns a new PaginatedResult
for the first page of results. When using the Realtime library, the first
method returns a Deferrable and yields a PaginatedResult.The method is asynchronous and returns a Task which needs to be awaited to get the PaginatedResult.
itemsItems
Object[] items()List items()Object[] itemsObject[] items()List
Items items: [AnyObject]
Returns the current page of results as an Arraya Lista List
. The type of the objects in the arraylist is determined by the operation that provided the PaginatedResult
. For example, a Message.history()Message.History() request will return an arraya list of Message
objects.
nextNext
next(callback(ErrorInfo err, PaginatedResult resultPage))PaginatedResult nextPaginatedResult next()PaginatedResult next()Task<PaginatedResult
> NextAsync() PaginatedResult next()next(callback: (ARTPaginatedResult?, ARTErrorInfo?) → Void)
Returns a new PaginatedResult
loaded with the next page of results. If there are no further pages, then null
a blank PaginatedResult will be returnedNull
None
nil
is returned. The method is asynchronous and return a Task which needs to be awaited to get the PaginatedResult
When using the Realtime library, the first
method returns a Deferrable and yields a PaginatedResult.
Example
channel.history(function(err, paginatedResult) {
console.log('Page 0 item 0:' + paginatedResult.items[0].data);
paginatedResult.next(function(err, nextPage) {
console.log('Page 1 item 1: ' + nextPage.items[1].data);
console.log('Last page?: ' + nextPage.isLast;
});
});
channel.history(function(err, paginatedResult) {
console.log('Page 0 item 0:' + paginatedResult.items[0].data);
paginatedResult.next(function(err, nextPage) {
console.log('Page 1 item 1: ' + nextPage.items[1].data);
console.log('Last page?: ' + nextPage.isLast;
});
});
PaginatedResult firstPage = channel.history();
System.out.println("Page 0 item 0:" + firstPage.items[0].data);
if (firstPage.hasNext) {
PaginatedResult nextPage = firstPage.next();
System.out.println("Page 1 item 1:" + nextPage.items[1].data);
System.out.println("More pages?:" + Strong.valueOf(nextPage.hasNext()));
};
PaginatedResult<Message> firstPage = await channel.HistoryAsync(null);
Message firstMessage = firstPage.Items[0];
Console.WriteLine("Page 0 item 0: " + firstMessage.data);
if (firstPage.HasNext)
{
var nextPage = await firstPage.NextAsync();
Console.WriteLine("Page 1 item 1:" + nextPage.Items[1].data);
Console.WriteLine("More pages?: " + nextPage.HasNext);
}
# When using the REST sync library
first_page = channel.history
puts "Page 0 item 0: #{first_page.items[0].data}"
if first_page.has_next?
next_page = first_page.next
puts "Page 1 item 1: #{next_page.items[1].data}"
puts "Last page?: #{next_page.is_last?}"
end
# When using the Realtime EventMachine library
channel.history do |first_page|
puts "Page 0 item 0: #{first_page.items[0].data}"
if first_page.has_next?
first_page.next do |next_page|
puts "Page 1 item 1: #{next_page.items[1].data}"
puts "Last page?: #{next_page.is_last?}"
end
end
end
result_page = channel.history()
print 'Page 0 item 0: ' + str(result_page.items[0].data)
if result_page.has_next():
next_page = result_page.next()
print 'Page 1 item 1: ' + str(next_page.items[1].data)
print 'Last page?: ' + str(next_page.is_last())
$firstPage = $channel.history();
echo("Page 0 item 0: " . $firstPage->items[0]->data);
if ($firstPage->hasNext()) {
$nextPage = $firstPage->next();
echo("Page 1 item 1: " . $nextPage->items[1]->data);
echo("Last page?: " . $nextPage->isLast());
}
[channel history:^(ARTPaginatedResult<ARTMessage *> *paginatedResult, ARTErrorInfo *error) {
NSLog(@"Page 0 item 0: %@", paginatedResult.items[0].data);
[paginatedResult next:^(ARTPaginatedResult<ARTMessage *> *nextPage, ARTErrorInfo *error) {
NSLog(@"Page 1 item 1: %@", nextPage.items[1].data);
NSLog(@"Last page?: %d", nextPage.isLast);
}];
}];
channel.history { paginatedResult, error in
let paginatedResult = paginatedResult!
print("Page 0 item 0: \((paginatedResult.items[0] as! ARTMessage).data)")
paginatedResult.next { nextPage, error in
let nextPage = nextPage!
print("Page 0 item 0: \((nextPage.items[1] as! ARTMessage).data)")
print("Last page? \(nextPage.isLast)")
}
}
io.ably.lib.types.Param
Param
is a type encapsulating a key/value pair. This type is used frequently in method parameters allowing key/value pairs to be used more flexible, see Channel#history
for an example.
Please note that key
and value
attributes are always strings. If an Integer
or other value type is expected, then you must coerce that type into a String
.
Members
- key
- The key value
Type:String
- value
- The value associated with the
key
Type:String