Spring Batch is an extension of the Spring framework designed for extensibility and ease of use. It is a lightweight and highly customizable framework, which is perfect for building complex applications. In this tutorial, we will learn about the basics of this framework and how to create your batch jobs. You will also learn about parallel processing, reporting, scaling, and exception handling. In addition, we will cover some everyday use cases for the spring batch.
Parallel processing
Spring Batch can scale to a large number of threads, which can make it more efficient and effective. To parallelize your processing, you can divide your task into multiple threads and schedule them to run simultaneously. There are four ways to set up parallel processing in Spring Batch: a single process, a multi-threaded process, parallel steps, and partitioning.
A crucial part of parallel processing in Spring Batch is preventing external interference. This is done by ensuring that each task execution is performed without outside interference. To prevent this, Spring Batch uses Job Repositories to record and manage the state of each running job. This state is then taken into account when a future execution of the job takes place.
Reporting
Spring Batch can log skipped items for you, so you can correct the input file or manually process errors. You can use the logging feature in several ways, including exception classes. In this tutorial, you’ll learn about several ways to use exception classes to log skipped items.
Spring Batch provides many different reusable job-related functions necessary when processing large volumes of data. These include transaction management, job processing statistics, and logging. These services allow you to run high-volume, high-performance batch jobs.
Scaling
Scaling Spring Batch is a great way to create large-scale applications quickly. The scaling spring batch tutorial starts by identifying the critical components of the Spring Batch framework and describing how they are used. The next part of the tutorial covers job inheritance, which helps you create environment-specific configurations. It also explains how to use the execution context and job parameters.
Before you begin, you’ll need to configure a message channel and an integration service like Spring Integration. Then, you’ll create a Spring Batch bean that receives the partitioned data. This bean should have late binding because the Spring batch step must determine the partition count.
Exception handling
When you want to run a batch job using Spring Batch, you’ll need to understand how to handle exceptions. Exceptions happen when a job cannot continue due to a problem with the code. For example, a job might read a flat file containing products and then inserts those products into a database. If a chunk is not successful, the entire job might fail. To prevent this from happening, you can specify an exception class.
Spring Batch provides several features that will help you deal with exceptions. One of them is retrying. This feature allows you to specify how often the operation should be retried before it fails. It also has a mechanism that lets you log an exception and take appropriate action.
Transaction management
Before we get started, we must first understand how transactions in Spring Batch work. Generally, a batch is split into chunks, and each chunk runs in its transaction. The CompletionPolicy determines the size of each chunk. When the completion policy is met, Spring Batch stops reading and starts processing. You can specify the completion policy with the commit-interval attribute. You can also specify a custom completion policy with a chunk-completion policy.
You can also use the @Transactional annotation to roll back a transaction declaratively. This annotation is functional when you’re writing code that might throw an exception and then roll back a transaction.
ItemReader
Before we write our own batch jobs, let’s understand how the Spring batch framework handles reading and writing data from different sources. The ItemReader interface is responsible for reading data from various file systems, databases, and other sources. Its read() method returns the next T object or null if no object is found.
The read method is the most basic contract of an ItemReader. This method returns one item or null if there are no more items to read. An item can represent a row or line in a database or an element in an XML file. Usually, these items will be mapped to a usable domain object, but this mapping is not mandatory.
AccountItemWriter
This Spring batch tutorial will look at the AccountItemWriter class, which implements the ItemWriter interface. Spring Batch invokes the write method in this class with a list of account objects. We’ll also explore chunk size and the commit-interval attribute, which determines how many items are written to a single record. This is particularly important when writing large datasets.
Spring Batch is an excellent framework for implementing batch applications. It’s easy to use and extensible. If you’ve been using Spring Boot for a while, you’ve probably used this framework before. This tutorial will give you an overview of the basic concepts, including a simple example of creating an AccountItemWriter object.
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