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{section} The component SE Activiti provides two operational mode:
* integration mode, that exposes a service-based API of the engine Activiti. Several services are provided by the component to interact directly with the engine Activiti,
* service mode to implement your services using orchestrations and workflows.
h2. Integration mode
h2. Integration mode
{color:red}*TODO*{color}
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
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!
!orchestration-sample.png|align=center!
*Process*
{color:red}*TODO*{color}
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:
!process-sample.png|align=center!
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".
* 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:
!process-sample.png|align=center!
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".
*Process & Orchestration*
The Activiti Service-Engine allows to run process or service orchestration.
Each configuration of this component embeds an Activiti process definition.
When such a configuration is deployed, a service with several operations is deployed providing following features:
* start a process instance of the process definition,
* complete the current task,
* retrieve process instances according to several criteria.
{tip}Available operations can be different from a version of the component to another version. See the user guide of the right version.{tip}
*Concurrency*
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