org.camunda.bpm.client.spring.annotation

Annotation Type EnableExternalTaskClient

@Documented
 @Target(value=TYPE)
 @Retention(value=RUNTIME)
 @Import(value=PostProcessorConfiguration.class)
public @interface EnableExternalTaskClient

Annotation to bootstrap the External Task Client

Heads-up:

• for attributes of type String, the string $null$ is reserved and used as default value
• for attributes of type Long, the value Long.MIN_VALUE is reserved and used as default value
• for attributes of type Integer, the value Integer.MIN_VALUE is reserved and used as default value

Field Summary

Fields

Modifier and Type	Fields and Description
static int	INT_NULL_VALUE
static long	LONG_NULL_VALUE
static String	STRING_NULL_VALUE

Optional Element Summary

Optional Elements

Modifier and Type	Optional Element and Description
long	asyncResponseTimeout Asynchronous response (long polling) is enabled if a timeout is given.
String	baseUrl Base url of the Camunda Runtime Platform REST API.
String	dateFormat Specifies the date format to de-/serialize date variables.
String	defaultSerializationFormat Specifies the serialization format that is used to serialize objects when no specific format is requested.
boolean	disableAutoFetching Disables immediate fetching for external tasks after bootstrapping the client.
boolean	disableBackoffStrategy Disables the client-side backoff strategy.
long	lockDuration
int	maxTasks Specifies the maximum amount of tasks that can be fetched within one request.
boolean	usePriority Specifies whether tasks should be fetched based on their priority or arbitrarily.
String	value Base url of the Camunda Runtime Platform REST API.
String	workerId A custom worker id the Workflow Engine is aware of.

Field Detail

STRING_NULL_VALUE

public static final String STRING_NULL_VALUE

LONG_NULL_VALUE

public static final long LONG_NULL_VALUE

INT_NULL_VALUE

public static final int INT_NULL_VALUE

Element Detail

value

@AliasFor(value="baseUrl")
public abstract String value

Base url of the Camunda Runtime Platform REST API. This information is mandatory. Alias of baseUrl().

Returns:

baseUrl of the Camunda Runtime Platform REST API

Default:

"$null$"

baseUrl

@AliasFor(value="value")
public abstract String baseUrl

Base url of the Camunda Runtime Platform REST API. This information is mandatory. Alias of value().

Returns:

baseUrl of the Camunda Runtime Platform REST API

Default:

"$null$"

maxTasks

public abstract int maxTasks

Specifies the maximum amount of tasks that can be fetched within one request. This information is optional. Default is 10.

Returns:

maxTasks which are supposed to be fetched within one request

Default:

-2147483648

workerId

public abstract String workerId

A custom worker id the Workflow Engine is aware of. This information is optional. Note: make sure to choose a unique worker id

If not given or null, a worker id is generated automatically which consists of the hostname as well as a random and unique 128 bit string (UUID).

Returns:

workerId the Workflow Engine is aware of

Default:

"$null$"

usePriority

public abstract boolean usePriority

Specifies whether tasks should be fetched based on their priority or arbitrarily. This information is optional. Default is true.

Returns:

usePriority when fetching and locking tasks

Default:

true

asyncResponseTimeout

public abstract long asyncResponseTimeout

Asynchronous response (long polling) is enabled if a timeout is given. Specifies the maximum waiting time for the response of fetched and locked external tasks. The response is performed immediately, if external tasks are available in the moment of the request. This information is optional. Unless a timeout is given, fetch and lock responses are synchronous.

Returns:

asyncResponseTimeout of fetched and locked external tasks in milliseconds

Default:

-9223372036854775808L

disableAutoFetching

public abstract boolean disableAutoFetching

Disables immediate fetching for external tasks after bootstrapping the client. To start fetching ExternalTaskClient.start() must be called.

Returns:

disableAutoFetching when after bootstrapping the client

Default:

false

disableBackoffStrategy

public abstract boolean disableBackoffStrategy

Disables the client-side backoff strategy. When set to true, a BackoffStrategy bean is ignored.

NOTE: Please bear in mind that disabling the client-side backoff can lead to heavy load situations on engine side. To avoid this, please specify an appropriate asyncResponseTimeout().

Returns:

disableBackoffStrategy

Default:

false

lockDuration

public abstract long lockDuration

Returns:

lockDuration

• in milliseconds to lock the external tasks
• must be greater than zero
• the default lock duration is 20 seconds (20,000 milliseconds)
• is overridden by the lock duration configured on a topic subscription

Default:

-9223372036854775808L

dateFormat

public abstract String dateFormat

Specifies the date format to de-/serialize date variables. The option defaults to yyyy-MM-dd'T'HH:mm:ss.SSSZ

Returns:

dateFormat date format to be used

Default:

"$null$"

defaultSerializationFormat

public abstract String defaultSerializationFormat

Specifies the serialization format that is used to serialize objects when no specific format is requested. This option defaults to application/json.

Returns:

defaultSerializationFormat serialization format to be used

Default:

"$null$"