Process Patterns in BizAGI

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Overview Types of events Types of gateways Design patterns

list

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Events Fire as a result of something happening

A message is received A period of time elapses An exceptional conditional arises

We typically perform an action in response to an event

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Event Types Message – Arrives from a participant Timer – Process starts at a period in

time Rule (conditional)– Triggers when a rule

becomes true

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Event Types (2) Link – Connect the end event of one

process to the start of another process Multiple – Multiple ways of triggering

the process Exception – An error End events

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Message Events Messages are typically sent by one

participant and received by another Send sales order information that is

received by accounting to check credit The event can be thrown or caught

Sending a message means throwing a message

Receiving a message means catching a message

See MessageThrowCatch in EventSamples

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Message Throw Catch Example

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Timer Events The event fires a specific time or cycle

Only applicable to start or intermediate events

In BizAgi, use the Element properties to set the timer to a date or cycle

Examples Time delay to approve credit Wait for payment date Start payroll process every two weeks See Timer in EventSamples

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Conditional Events Events that fire when an external

condition becomes true or false Process A/P checks on Mondays

We could also implement this as a timer Inventory below threshold – generate

order request Only applicable to start or intermediate

events See Conditional in EventSamples

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Gateways 1 Gateways are used to depict decisions

or merges Types

Exclusive (XOR) Only one output (alternative) flow is

allowed Gateways diverge or converge

Inclusive (OR) A default output flow must be specified

Parallel for / join (AND)

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Gateways (2) Event-based gateways

These are (Exclusive) gateways that rely on external messages

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Gateway – XOR Example Exclusive XOR Decision

See ExclusiveGateway in EventSamples

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Gateway - OR Inclusive OR decision

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Gateway – Example 3 Parallel Forking – All sequence flows

drawn out of the gateway are taken

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Processes and Tasks A process is a network of steps A process can be marked as having a

sub-process

To mark an activity has having a sub process, right-click the activity and click Transform to subprocess

Slide 16

Sub Processes – Illustration (1)

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Data Objects First, we are not talking about a

database or physical data We are talking about information about a

process Data objects are attached to a sequence

or message flow with a dashed line

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Data Objects (Illustration)

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Text Annotation Contains descriptive text about a

process A line connects the annotation to the

activity

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Workflow Patterns (Introduction) In this second section of the lecture, we

talk about simple and complex workflow patterns

Much of this is derived from the AIFB paper (Modeling Workflow Patterns) in this lecture

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Sequence Pattern Tasks are executed in sequence (one

after another)

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Parallel Split This is a logical AND gateway The parallel branches are executed

concurrently

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Parallel Split (Example)

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Synchronization Two or more different branches get

merged into a single branch All merged branches must be completed

before the process can continue (Implied) Synchronization can occur because of a

parallel split

Slide 25

Synchronization (Illustration)

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Exclusive Choice Here, we are making a decision with

mutually exclusive outcomes (Only one outcome is possible)

Slide 27

Exclusive Choice (Example)

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Simple Merge A point in a process where two or more

branches are merged into a single branch

The initial branches are created via some type of choice

Slide 29

Simple Merge (Example)