The document discusses batch processing in three phases: input, process records, and on complete. In the input phase, a collection object is prepared with the input messages. The process records phase processes each record in the collection individually and in parallel. The on complete phase provides statistics on successful, failed, and total records. An example transforms a CSV file to XML using batch processing, with the input reading the CSV file, process records transforming and writing to XML files in batches, and on complete logging statistics.

1. Batching
Vasanthi

2. 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.

3. 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.

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

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

6. • 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.

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

9. • 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.

10. •Thank You All