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h1. Features

The component SE Activiti provides two operational mode:
* integration mode, that exposes a service-based API of the engine Activiti,
* service mode to implement your services using orchestrations and workflows.

h2. Integration mode

The mode "Integration" of the SE Activiti permits to interact directly with the engine Activiti through a service-based API. Several services are provided by the component to interact directly with the engine Activiti. This mode is activated at the component level.

*Concurrency*

Several instance of the component can be deployed concurrently on Petals ESB. A sequence of service-based API invocations can be exploded on each component instances

h2. Service mode

The mode "Service" of the SE Activiti permits to implement your services using orchestration and/or process capabilities of Activiti. This mode is available through the deployment of a service unit including the process definition.

*Orchestration*

An orchestration is sequence of automatic service invocations, and can be modeled as a sequence of service tasks in a BPMN2 description. Creating an instance of such a process will start automatically the sequence of service invocations. As Activiti supports BPMN2, it is possible to implement your orchestration as a process containing only service tasks. For example, the following orchestration can be an implementation of a service processing a "New Order":
!orchestration-sample.png|align=center!

*Process*

A process or workflow can be "servicized" at different levels:
* when creating a new instance of the process definition,

Then created services are:
* the service "New Order" associated to a process instance creation,
* the service "Order Prepared" associated to the completion of the task "prepareOrder",
* the service "Order Delivered" associated to the completion of the task "deliverOrder".

*Concurrency*

Several instance of the component can be deployed concurrently on Petals ESB. So, you are able to deploy each process definitions on several component instances to get high availability.

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