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Overview  PackageDeprecated  Help  API Reference for EPL (ApamaDoc) 10.15.1.2
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com.apama.cumulocity
Event Alarm

Represents an alarm, used to indicate a warning or error associated with a specific source managed object such as when the temperature of a fridge increases above a particular threshold.

This event can be sent to Cumulocity to create an alarm, and can also be received from Cumulocity as a notification when a device or other application creates an Alarm, or updates an Alarm.

Receiving Alarm notifications requires configuration property subscribeToAllMeasurements to be set to true, and the notifications go to Alarm.SUBSCRIBE_CHANNEL. For example: 
 Alarm("22","c8y_UnavailabilityAlarm","12669915",1464365565.661,"No communication with device since 2016-05-27T18:11:23.886+02:00","ACKNOWLEDGED","MAJOR",1,{}) 
 Alarm("11","com_cumulocity_events_BatteryWarning","1122",1464365565.661,"Low battery level","ACTIVE","MINOR",1,{"history":{}})


To create/update an Alarm, send an Alarm event object to Alarm.SEND_CHANNEL. For example: 
 // Create an Alarm:
 send Alarm("","c8y_UnavailabilityAlarm","12669915",1464365565.661,"No communication with device since 2016-05-27T18:11:23.886+02:00","ACKNOWLEDGED","MAJOR",1,new dictionary<string,any>) to Alarm.SEND_CHANNEL; 
 // Update the text, status and severity fields:
 send Alarm("11","c8y_UnavailabilityAlarm","12669915",1464365565.661,"Low battery level","ACTIVE","MINOR",1,new dictionary<string,any>) to Alarm.SEND_CHANNEL;


When listening for events of this type from Cumulocity, use the isCreate() and/or isUpdate() actions within the listener to distinguish between create and update events.
Constant summary
 stringCHANNEL := "CumulocityIoTGenericChain"

The channel for sending updates/ new Alarms to.
Deprecated:
[This channel constant has been deprecated. Use SEND_CHANNEL for sending and SUBSCRIBE_CHANNEL for receiving events.]
 stringNOTIFICATION_CREATED := "CREATED"

Value of PARAM_NOTIFICATION that indicates this is a new object.
 stringNOTIFICATION_UPDATED := "UPDATED"

Value of PARAM_NOTIFICATION that indicates this is an update to an existing object.
 stringPARAM_NOTIFICATION := ".apama_notificationType"

Entry in params that identifies if this is a new object or an update to an existing object. Entry will have a value matching either NOTIFICATION_CREATED or NOTIFICATION_UPDATED.
 stringSEND_CHANNEL := "CumulocityIoTGenericChain"

The channel for sending Alarms.
 stringSUBSCRIBE_CHANNEL := "cumulocity.measurements"

The channel for receiving Alarm notifications.
 
Member summary
 stringid

Unique identifier for this Alarm.
 stringtype

The type of the Cumulocity event.
 stringsource

Identifier of the managed object associated with the event.
 floattime

Timestamp of the event.
 stringtext

Text or message of the Alarm.
 stringstatus

The status of the alarm: ACTIVE, ACKNOWLEDGED or CLEARED.
 stringseverity

The severity of the alarm: CRITICAL, MAJOR, MINOR or WARNING. Must be upper-case.
 integercount

The number of times this alarm has been sent.
 dictionary<string, any>params

Any other properties available on the Alarm.
 
Action summary
 booleanisCreate()

Check if this Alarm instance was as a result of an alarm being created in Cumulocity.
 booleanisUpdate()

Check if this Alarm instance was as a result of an alarm being updated in Cumulocity.
 com.apama.cumulocity.ResponseWrapperwithChannelResponse(integer reqId, dictionary<string, string> headers)

Create or update an Alarm in Cumulocity and receive a response event confirming the change on Alarm.SUBSCRIBE_CHANNEL channel.
 com.apama.cumulocity.ResponseWrapperwithResponse(integer reqId, dictionary<string, string> headers)

Create or update an Alarm in Cumulocity and receive a response event on default channel, confirming the change.
Deprecated:
[This API has been deprecated. Use withChannelResponse API to receive confirmation on Alarm.SUBSCRIBE_CHANNEL channel.]
 
Constant detail

CHANNEL

string CHANNEL := "CumulocityIoTGenericChain"
Deprecated:
[This channel constant has been deprecated. Use SEND_CHANNEL for sending and SUBSCRIBE_CHANNEL for receiving events.]
The channel for sending updates/ new Alarms to.

NOTIFICATION_CREATED

string NOTIFICATION_CREATED := "CREATED"
Value of PARAM_NOTIFICATION that indicates this is a new object.
Since:
10.5.4.0

NOTIFICATION_UPDATED

string NOTIFICATION_UPDATED := "UPDATED"
Value of PARAM_NOTIFICATION that indicates this is an update to an existing object.
Since:
10.5.4.0

PARAM_NOTIFICATION

string PARAM_NOTIFICATION := ".apama_notificationType"
Entry in params that identifies if this is a new object or an update to an existing object. Entry will have a value matching either NOTIFICATION_CREATED or NOTIFICATION_UPDATED.
Since:
10.5.4.0

SEND_CHANNEL

string SEND_CHANNEL := "CumulocityIoTGenericChain"
The channel for sending Alarms.
Since:
10.5.2.0

SUBSCRIBE_CHANNEL

string SUBSCRIBE_CHANNEL := "cumulocity.measurements"
The channel for receiving Alarm notifications.
Since:
10.5.2.0
Member detail

count

integer count
The number of times this alarm has been sent.

id

string id
Unique identifier for this Alarm.

Supply as empty if creating a new Alarm.

params

dictionary<string, any> params
Any other properties available on the Alarm.

severity

string severity
The severity of the alarm: CRITICAL, MAJOR, MINOR or WARNING. Must be upper-case.

source

string source
Identifier of the managed object associated with the event.

status

string status
The status of the alarm: ACTIVE, ACKNOWLEDGED or CLEARED.

text

string text
Text or message of the Alarm.

time

float time
Timestamp of the event.

type

string type
The type of the Cumulocity event.
Action detail

isCreate

boolean isCreate()
Check if this Alarm instance was as a result of an alarm being created in Cumulocity.

For Alarm events that have come from Cumulocity, only one of isCreate() or isUpdate() will return true.
Throws:
Throws IllegalStateException if called on an instance that did not come from Cumulocity.
Since:
10.7.1.0
See Also:
com.apama.cumulocity.Alarm#isUpdate() - 

isUpdate

boolean isUpdate()
Check if this Alarm instance was as a result of an alarm being updated in Cumulocity.

For Alarm events that have come from Cumulocity, only one of isCreate() or isUpdate() will return true.
Throws:
Throws IllegalStateException if called on Alarm events that did not come from Cumulocity
Since:
10.7.1.0
See Also:
com.apama.cumulocity.Alarm#isCreate() - 

withChannelResponse

com.apama.cumulocity.ResponseWrapper withChannelResponse(integer reqId, dictionary<string, string> headers)
Create or update an Alarm in Cumulocity and receive a response event confirming the change on Alarm.SUBSCRIBE_CHANNEL channel.

Just sending an Alarm is fire and forget. If your application requires an acknowledgement or the ID of the Alarm created or updated on Event.SUBSCRIBE_CHANNEL, then use the withChannelResponse API. You will need to subscribe to Alarm.SUBSCRIBE_CHANNEL channel. This API will create an event that can be sent as normal and get a response from Cumulocity for the newly created or updated Alarm. The responses are either an ObjectCommitted event or an ObjectCommitFailed event. The withChannelResponse API also allows you to provide headers to the create or update request. For example: 

monitor.subscribe(Alarm.SUBSCRIBE_CHANNEL);
Alarm a := new Alarm;
// set fields in a
integer reqId := com.apama.cumulocity.Util.generateReqId();
on ObjectCommitted(reqId=reqId) as commit and not ObjectCommitFailed(reqId=reqId) {
	// do something
}
on ObjectCommitFailed(reqId=reqId) as failure and not ObjectCommitted(reqId=reqId) {
	// do something
}
send a.withChannelResponse(reqId, { "X-Cumulocity-Processing-Mode": "TRANSIENT" }) to Alarm.SEND_CHANNEL;
Parameters:
reqId - A request identifier generated from Util.generateReqId(). The response from Cumulocity will have the matching request identifier.
headers - Set headers of the create/update request. This can be used to explicitly control the processing mode of the create/update request.
See Also:
com.apama.cumulocity.ObjectCommitted - Successfully created or updated a Alarm.
com.apama.cumulocity.ObjectCommitFailed - Failed to create or update a Alarm.

withResponse

com.apama.cumulocity.ResponseWrapper withResponse(integer reqId, dictionary<string, string> headers)
Deprecated:
[This API has been deprecated. Use withChannelResponse API to receive confirmation on Alarm.SUBSCRIBE_CHANNEL channel.]
Create or update an Alarm in Cumulocity and receive a response event on default channel, confirming the change.

Just sending an Alarm is fire and forget. If your application requires an acknowledgement or the ID of the Alarm created or updated, then use the withResponse API. This API will create an event that can be sent as normal and get a response from Cumulocity for the newly created or updated Alarm. The responses are sent to default channel and hence can be listened for only in the main context. The responses are either an ObjectCommitted event or an ObjectCommitFailed event. The withResponse API also allows you to provide headers to the create or update request. For example: 

Alarm a := new Alarm;
// set fields in a
integer reqId := com.apama.cumulocity.Util.generateReqId();
on ObjectCommitted(reqId=reqId) as commit and not ObjectCommitFailed(reqId=reqId) {
	// do something
}
on ObjectCommitFailed(reqId=reqId) as failure and not ObjectCommitted(reqId=reqId) {
	// do something
}
send a.withResponse(reqId, { "X-Cumulocity-Processing-Mode": "TRANSIENT" }) to Alarm.SEND_CHANNEL;
Parameters:
reqId - A request identifier generated from Util.generateReqId(). The response from Cumulocity will have the matching request identifier.
headers - Set headers of the create/update request. This can be used to explicitly control the processing mode of the create/update request.
See Also:
com.apama.cumulocity.ObjectCommitted - Successfully created or updated a Alarm.
com.apama.cumulocity.ObjectCommitFailed - Failed to create or update a Alarm.
com.apama.cumulocity.Alarm#withChannelResponse() - to receive confirmation on Alarm.SUBSCRIBE_CHANNEL channel.
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Overview  PackageDeprecated  Help  API Reference for EPL (ApamaDoc) 10.15.1.2
SUMMARY: IMPORT | CONSTANT | MEMBER | ACTIONDETAIL: IMPORT | CONSTANT | MEMBER | ACTION