10.9. AWS-SWF

SWF Component

Available as of Camel 2.13

The Simple Workflow component supports managing workflows from Amazon's Simple Workflow service.

Note

You must have a valid Amazon Web Services developer account, and be signed up to use Amazon Simple Workflow. More information are available at Amazon Simple Workflow.

URI Format

aws-swf://<workflow|activity>[?options]

You can append query options to the URI in the following format, ?options=value&option2=value&...

URI Options

Name	Default Value	Context	Description
`amazonSWClient`	`null`	All	A reference to a com.amazonaws.services.simpleworkflow.AmazonSimpleWorkflowClient in the Registry.
`accessKey`	`null`	All	Amazon AWS Access Key.
`secretKey`	`null`	All	Amazon AWS Secret Key.
`sWClient.XXX`	`null`	All	Properties to set on AmazonSimpleWorkflowClient in use.
`clientConfiguration.XXX`	`null`	All	Properties to set on ClientConfiguration in use.
`startWorkflowOptions.XXX`	`null`	Workflow/Producer	Properties to set on useStartWorkflowOptions in use.
`operation`	`START`	Workflow/Producer	The operation to perform on the workflow. Supported operations are: `SIGNAL`, `CANCEL`, `TERMINATE`, `GET_STATE`, `START`, `DESCRIBE`, `GET_HISTORY`.
`domainName`	`null`	All	The workflow domain to use.
`activityList`	`null`	Activity/Consumer	The list name to consume activities from.
`workflowList`	`null`	Workflow/Consumer	The list name to consume workflows from.
`eventName`	`null`	All	The workflow or activity event name to use.
`version`	`null`	All	The workflow or activity event version to use.
`signalName`	`null`	Workflow/Producer	The name of the signal to send to the workflow.
`childPolicy`	`null`	Workflow/Producer	The policy to use on child workflows when terminating a workflow.
`terminationReason`	`null`	Workflow/Producer	The reason for terminating a workflow.
`stateResultType`	`Object`	Workflow/Producer	The type of the result when a workflow state is queried.
`terminationDetails`	`null`	Workflow/Producer	Details for terminating a workflow.
`dataConverter`	`JsonDataConverter`	All	An instance of `com.amazonaws.services.simpleworkflow.flow.DataConverter` to use for serializing/deserializing the data.
`activitySchedulingOptions`	`null`	Activity/Producer	An instance of `ActivitySchedulingOptions` used to specify different timeout options.
`activityTypeExecutionOptions`	`null`	Activity/Consumer	An instance of `ActivityTypeExecutionOptions`.
`activityTypeRegistrationOptions`	`null`	Activity/Consumer	An instance of `ActivityTypeRegistrationOptions`.
`workflowTypeRegistrationOptions`	`null`	Workflow/Consumer	An instance of `WorkflowTypeRegistrationOptions`.

Note

You have to provide the amazonSWClient in the Registry or your accessKey and secretKey to access the Amazon's Simple Workflow Service.

Usage

Message headers evaluated by the SWF Workflow Producer

A workflow producer allows interacting with a workflow. It can start a new workflow execution, query its state, send signals to a running workflow, or terminate and cancel it.

Header	Type	Description
`CamelSWFOperation`	`String`	The operation to perform on the workflow. Supported operations are: SIGNAL, CANCEL, TERMINATE, GET_STATE, START, DESCRIBE, GET_HISTORY.
`CamelSWFWorkflowId`	`String`	A workflow ID to use.
`CamelAwsDdbKeyCamelSWFRunId`	`String`	A worfklow run ID to use.
`CamelSWFStateResultType`	`String`	The type of the result when a workflow state is queried.
`CamelSWFEventName`	`String`	The workflow or activity event name to use.
`CamelSWFVersion`	`String`	The workflow or activity event version to use.
`CamelSWFReason`	`String`	The reason for terminating a workflow.
`CamelSWFDetails`	`String`	Details for terminating a workflow.
`CamelSWFChildPolicy`	`String`	The policy to use on child workflows when terminating a workflow.

Message headers set by the SWF Workflow Producer

Header	Type	Description
`CamelSWFWorkflowId`	`String`	The worfklow ID used or newly generated.
`CamelAwsDdbKeyCamelSWFRunId`	`String`	The worfklow run ID used or generated.

Message headers set by the SWF Workflow Consumer

A workflow consumer represents the workflow logic. When it is started, it will start polling workflow decision tasks and process them. In addition to processing decision tasks, a workflow consumer route, will also receive signals (send from a workflow producer) or state queries. The primary purpose of a workflow consumer is to schedule activity tasks for execution using activity producers. Actually activity tasks can be scheduled only from a thread started by a workflow consumer.

Header	Type	Description
`CamelSWFAction`	`String`	Indicates what type is the current event: CamelSWFActionExecute, CamelSWFSignalReceivedAction or CamelSWFGetStateAction.
`CamelSWFWorkflowReplaying`	`boolean`	Indicates whether the current decision task is a replay or not.
`CamelSWFWorkflowStartTime`	`long`	The time of the start event for this decision task.

Message headers set by the SWF Activity Producer

An activity producer allows scheduling activity tasks. An activity producer can be used only from a thread started by a workflow consumer ie, it can process synchronous exchanges started by a workflow consumer.

Header	Type	Description
`CamelSWFEventName`	`String`	The activity name to schedule.
`CamelSWFVersion`	`String`	The activity version to schedule.

Message headers set by the SWF Activity Consumer

Header	Type	Description
`CamelSWFTaskToken`	`String`	The task token that is required to report task completion for manually completed tasks.

Advanced amazonSWClient configuration

If you need more control over the AmazonSimpleWorkflowClient instance configuration you can create your own instance and refer to it from the URI:

The #client refers to a AmazonSimpleWorkflowClient in the Registry.

For example if your Camel Application is running behind a firewall:

AWSCredentials awsCredentials = new BasicAWSCredentials("myAccessKey", "mySecretKey");
ClientConfiguration clientConfiguration = new ClientConfiguration();
clientConfiguration.setProxyHost("http://myProxyHost");
clientConfiguration.setProxyPort(8080);

AmazonSimpleWorkflowClient client = new AmazonSimpleWorkflowClient(awsCredentials, clientConfiguration);

registry.bind("client", client);

Dependencies

Maven users will need to add the following dependency to their pom.xml.

<dependency>
    <groupId>org.apache.camel</groupId>
    <artifactId>camel-aws</artifactId>
    <version>${camel-version}</version>
</dependency>

where ${camel-version} must be replaced by the actual version of Camel (2.13 or higher).

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