Activiti Construction (v) BPMN Introduction

I am not very clear about BPMN, and at present it is only because of the unfamiliar components of Modeler query, to learn about this part of the content, do not ask for an understanding, learn to understand it. So the introduction of this chapter will be relatively simple, but also enough.

The list of components in Modeler is slightly different from BPMN, and some of the content doesn't seem to have been ported to your demo, and there are some problems, and if possible, a detailed description of Modeler's composition, It is roughly the seventh section of the Official document overview and tenth process (important) that has been summed up on the web by http://wenku.baidu.com/view/92b1bc06cc17552707220854.html? From=search, you can see the contents of this link directly. I'm following the proofreading of its and official documents, stating that this column is not translated (too time consuming).

BPMN (Business process Modeling Notation), Orchestration Modeling and labeling, can form a business flowchart with a series of symbols (I call components) that define them. These components are then described in categories. Official website: http://www.bpmn.org/There is a BPMN v2.0 introduction and examples, if you do not understand can be viewed. http://www.omg.org/spec/BPMN/2.0/document and XML checksum file XSD. This is the detailed introduction, but are all in English, I am too lazy to read, just a few basic applications, if there is a need to look at the time. Http://www.omg.org/cgi-bin/doc?dtc/10-06-02 Here are some of the official examples that teach you how to use these components.

1 Stream object (flow Objects)

The flow object is the most basic concept, it is very important.

1.1 Event (events) P271

Events are represented by a circle, which affects the flow of the flow, usually with a cause (trigger) or an impact (result). The standard defines three types of events: Start, middle, and end. From the definition and classification names can also guess the role of events, control the beginning of the process, intermediate flow and end, these controls may take a trigger (trigger) to complete, or lead to a result (end or throw).

(1) Start Event

Chinese	English	Trigger	Description	Marker
Start Event	Start Event	None
Conditional Start Event	Conditional Start Event	Conditional
Message Start Event	Message Start Event	Message
Multiple boot events	Multiple Start Event	Multiple
Multiple Parallel start events	Parallel Multiple Start Event	Parallel Multiple
Signal Start Event	Signal Start Event	Signal
Timed Start Events	Timer Start Event	Timer

(2) Intermediate Event Intermediate Event intermediate events are used in two ways: 1. Place intermediate events in a normal workflow for two purposes: intermediate events can be used for "catch" event triggers, or "throw" event departures. 2. An intermediate event is placed in the middle of an activity, and can only be used for "catch" event triggers, that is, capturing an event and handling it accordingly.

Chinese	English	Trigger	Description	Marker
Intermediate events	None Intermediate Event	None
Message Events	Message Intermediate Event	Message
Timed events	Timer Intermediate Event	Timer
Upgrade Events	Escalation Intermediate Event	Escalation
Compensating events	Compensation Intermediate Event	Compensation
Conditional events	Conditional Intermediate Event	Conditional
Link Events	Link Intermediate Event	Link
Signal Events	Signal Intermediate Event	Signal
Multiple events	Multiple intermediate Event	Multiple
Parallel Multiple Events	Parallel Multiple Intermediate Event	Parallel multiple

The intermediate event is not only these, the remaining is related to Activiti boundary, here is not listed, specific view of the official website document P284 page. (3) The End Event End event must be the target of a sequential flow, not a source, and can have multiple sequential flows pointing to the same end stream. A process can have multiple end events or no end events, but if there is a start event, at least one end event must be present. If you do not use an end event, then all stream objects do not have any outgoing sequence (sequential) flow (that is, a different source sequence flow) to flag the process end. The process does not end until all parallel paths are completed.

Chinese	English	Trigger	Description	Marker
End Event	None End Event	None
Message End Event	Message End Event	Message
Error End Event	Error End Event	Error
Upgrade End Event	Escalation End Event	Escalation
Cancel End Event	Cancel End Event	Cancel
Compensation End Event	Compensation End Event	Compensation
Signal End Event	Signal End Event	Signal
Terminating End Event	Terminate End Event	Terminate
Multiple End Events	Multiple End Event	Multiple

1.2 Activities (Activities) P181

(1) Tasks P186

A task is an atomic activity in the process flow, and the task is used as a finer level of detail when the job in the process cannot be interrupted. Typically, an end user or an application whose execution behaves as a task form. The Task object has the same shape in the sub-process, all rectangles have rounded corners.

There are three special task icons: loops, multiple instances, and compensation, and one task may have one or two such icons.

Other tasks:

Chinese	English	Description	Icon
Service tasks	Service Task
Send Task	Send Task
Receiving tasks	Receive Task
User Tasks	User Task
Manual tasks	Manual Task
Business Rule Tasks	Business Rule Task
Script Task	Script Task

In these tasks, people are required to participate in the manual task and user task that they have completed. The Manual task is a task that is not managed by any commercial process engine, and the User task is. Being out of management means that the process engine cannot track the start and finish of its tasks. For example, this could be a paper full of instructions for telephone technicians to help customers install the phone.

(2) Sub-processes sub-process P203

A sub-process is a model of the internal details of an activity, using activities, events, and gateways, and sequence flows. A sub-process is a graphical object within a process, but it can also be opened to show a lower level of flow. A sub-process defines a context scope that can be used for property visibility, scope of transactions, exception handling, events, or compensation.

BPMN defines a five seed flow, where collapsed sub-process can be replaced by four additional combinations. The other four types are loop, multi-instance, compensation, Ad-hoc.

Here are some uses:

(3) Call activity P213

Call activity determines the point in a process that uses a global process or global task. The calling procedure is used as a wrapper to invoke the global process or global task execution. Activating the invoke activity results in a control transfer called a global process or global task.

The invocation activity must satisfy the data requirements while calling Callableelement to return the data. This means that these elements need to be included in the active inputoutputspecification and must be matched exactly to the callableelement element. These elements include: Datainputs, Dataoutputs, Inputsets, Outputsets.

1.3 Gateway (Gateways) P317

Gateways are used to control how sequential flows converge and diverge in a process. If a process does not need to be controlled, then the gateway is non-essential. The term "gateway" means there is a gate mechanism. Allow or disallow through the gateway-that is, when executing to the gateway, when the gateway mechanism is invoked, the input can be merged together, or the output is separated into several parts.

Chinese	English	Description	Icon
Mutex Gateway	Exclusive Gateway
Event Gateway	Event-based Gateway
Parallel Event Gateways	Parallel Event-based Gateway
Compatible gateways	Inclusive Gateway
Complex gateways	Complex Gateway
Parallel gateways	Parallel Gateway

2 Data (P233)

Traditional process modeling requires the ability to simulate the creation, operation, and execution of items (physical or informational) in a process. The important aspect is the ability to capture the structure of the data and query or manipulate the structure.

BPMN itself does not provide a built-in model to describe a data structure or a language expression of the query. Instead, it regulates hooks to allow the use of externally defined data structures and expression languages. In addition, BPMN allows different data structures and expression languages in the same model. The compatibility and validation of these languages is beyond the scope of the specification and becomes the responsibility of the tool vendor.

BPMN uses XML schema and XPath as its default data structure and expression language, but vendors are free to replace their own language.

Chinese	English	Description	Icon
Data Objects	Data Object
Aggregate Data Objects	Collection DataObject
Data storage	Data Store
Input data	Data Input
Output	Data Output

There are other uses, depending on the official documentation. 3 Connection object (connecting Objects) P59

4 Lanes (Swimlanes) 4.1 Pool (pools)

A pool is a container that is isolated from other pools. Typically used in an interactive process. The pool acts primarily on the physical division between two independent entities or participants. Activities in each pool usually have their own processes. As a result, sequential flow does not usually cross multiple pools, and message flow is possible (excerpt from: Http://wenku.baidu.com/view/59b540d228ea81c758f5783c.html?from=search)

4.2 Lanes (Lanes)

The sub-division of the pool, which can be vertical or horizontal, is used to organize and classify activities. Lane is closer to the concept of our traditional swimlane. Lane is often used to divide activities into roles, and the process can flow across the lane in a pool, but in a pool it usually does not (the source is the same as above).

5 workpiece (artifacts) 5.1 groups (group)

Grouping a subset of elements for logical or specific purposes for easy viewing and management, for interpretation and description purposes, without affecting the flow of the process (IBID.).

5.2 Text annotations (text Annotation)

Provide some additional textual information to the reader of the flowchart.

Activiti Construction (v) BPMN Introduction