Mule flows contain three main types of elements: filters, scopes, and routers. Filters evaluate messages to determine if they can proceed in the flow. Scopes encapsulate message processors to execute them as a single unit. Routers direct and control messages by splitting, resequencing, aggregating, or routing them based on content. Examples provided demonstrate using filters to reject messages, scopes to add enrichments, and routers to choose processing pathways.

1. Mule Concepts
Elements in a Mule Flow :
Filters, Scopes and Routers

2. • Mule includes a variety of message processors
designed to facilitate message routing or filtering,
and message processor wrapping.
• They can be categorized as follows :
– Filters
– Scopes
– Routers
Elements in a Mule Flow

3. • Filters :
– Filters evaluate a message to determine whether it can
proceed through a flow.
– The simplest filters implement basic logic operators (such
as and, or, and not)
– These simple elements can be combined in various ways to
specify complex logical conditions.
– Example :
• a filter near the beginning of your flow can be used to reject any
requests from a particular range of IP addresses, or simply use a
filter to reject any messages with a particular payload, or with a
null payload
Elements in a Mule Flow : Filters

4. • Filters Example
(Expression Filter):
Elements in a Mule Flow : Filters

5. • Scopes :
– Work to encapsulate other message processors so that
they function as a single unit.
– You might wrap several message processors together to
form a transactional unit, so that they succeed or fail to
process a message together.
– This ensures accurate updating of a database, for
example.
– Example :
• You might wrap several message processors together within
acache scope to store the result of their processing for reuse, or
wrap a single message processor within a message enricher scope
to add to a message payload without manipulating the original
contents.
Elements in a Mule Flow : Scopes

6. • Scopes Example (Message Enricher and Cache Scope):
Elements in a Mule Flow : Scopes

7. • Routers / flow controls:
– Are used to direct or otherwise control messages within a flow.
– At times, flow controls act as splitters, resequencers, or
aggregators, splitting messages into individual items for
processing, resequencing message content, or aggregating split
messages.
– At times, they act as forks in the road, evaluating a message’s
payload, properties, or variables, then routing to the message
down a particular "pathway" according to those contents.
– Thus, flow controls facilitate content-based routing.
– Example :
• you can use a choice flow control to examine part of a message
payload, then route the message to the first "pathway" for which the
set condition evaluates to true, such as where an order exceeds
$5,000.
Elements in a Mule Flow : Routers

8. • Routers / flow controls Example (Choice Router):
Elements in a Mule Flow : Routers

9. Mule Concepts
Thank You.