Features

The component SE Activiti includes a BPMN 2.0 engine and provides two operational mode:

• integration mode, that exposes a service-based API of a BPMN 2.0 engine (Activiti),
• service mode to implement your services using orchestrations and workflows,
• the service tasks invoke natively, through the NMR, the services available into Petals ESB

Integration mode

The mode "Integration" of the SE Activiti permits to interact directly with the BPMN 2.0 engine (Activiti) through a service-based API. Several services are provided by the component to interact directly with the BPMN 2.0 engine. 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

Service mode

The mode "Service" of the SE Activiti permits to implement your services using orchestration and/or process capabilities of BPMN 2.0. 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. With 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":

Process

A process or workflow can be "servicized" at different levels:

• when creating a new instance of the process definition,
• when completing a task of the process instance
• when searching process instances or tasks

For example, the previous sample can be reworked replacing two service tasks by human tasks with such a process:

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.