Mule batch processing

 Batch component is used to process huge messages in batches. In
batch we have 3 phases.
1. Input
2. Process Records
3. On complete
Input:
Input phase is used to prepare a collection object with input
message. Because process records phase expects a collection object.

Process Records:
 Process Record phase expects a collection object to process the
each record of collection in individually and parallel. Here each object
of collection is a record.
On Complete:
 On complete phase is used to summarize the flow. Following
variables are available in On Complete phase to get the status of flow.
• Count of Successful records
• Count of Failure records
• Count of total records.

Example:
 In the following example, it explains how to transform CSV to XML using
batch. This example exposes a HTTP rest service.

 In the main flow input csv file path sets to payload and refer to a batch
job.

 In Input phase, an expression component is used to read file
(src/main/resources/input.csv) data. This expression component refers
to a file (src/main/resources/ReadFile.txt) which has code to read file
data. Another expression component has below expression to create a
collection object.
 payload = new com.techm.common.util.LineIterator(payload);
 LineIterator is our custom class which implements Iterator Interface to
implement collection object. Below is code of LineIterator class.

Note : Java Code Continuation from line 31 on next slide.

 In Process Records phase, we have two batch steps to transform
payload from csv to xml using datamapper and write the xml data into
a file. Second batch step contains batch commit. The message
processors which are in batch commit scope get execute depends of
size of batch commit.
 <batch:commit size="5" doc:name="Batch Commit">
 This batch commit get executed for every 5 records as configured.
 On Complete phase has one logger component which logs
successful, failure and total no of records.
 Note : SOAP UI project to test this application is placed in
src/test/resources.

Mule batch processing

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Mule batch processing