Introducing Spring Framework

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Chapter 20 Your First Spring XD Application The last quarter of 2013 saw the release of the first milestone of Spring XD. The Spring Framework and Spring XD team have been working very hard to include more features into this new Spring module. But what exactly is Spring XD? Spring XD is based on enterprise integration patterns and is based on the Spring Integration and Spring Batch modules. They play very nicely not only with Java but also with Groovy and Spring Boot. Spring XD is a service for real-time analytics, data ingestions, batch processing, and data export, and it provides a DSL (domain-specific language) for easy interaction. Also, it can work in single or distribute mode, making it more robust and extensible. It can also be used along with several technologies, like Hadoop, GemFire XD, RabbitMQ, Redis, etc. Installing Spring XD Let’s start by installing Spring XD. There are different ways to install Spring XD. One of the most common way is just to download the distribution and unzip it in any directory, set some environment variables, and that’s it. You will need to make sure that you have at least JDK 6 installed, but JDK 7 is recommended. Using the Spring XD Distribution Download the distribution from http://repo.spring.io/simple/libs-milestone-local/org/springframework/ xd/spring-xd/1.0.0.M7/spring-xd-1.0.0.M7-dist.zip (this is the latest at the time of writing). Unzip it and set the XD_HOME variable to point to \spring-xd\xd. This installation can be Windows or any UNIX flavor. Using OSX Homebrew Installation Homebrew is one of the best package managers for the OSX (you can find it and install it from http://brew.sh/) and is recommended because you can run several versions without disrupting others. The following commands will install spring-xd: $ brew tap pivotal/tap $ brew install sprinxd These commands will install Spring XD at /usr/local/Cellar/springxd/1.0.0.M7 and the executable will be linked to /usr/local/bin. Now you are ready to start the Spring XD service, but first you need to know some useful features that Spring XD supports. 277
Chapter 20 ■ Your First Spring XD Application Spring XD Spring XD can work in two different modes, single and multi-mode. The single mode can be used for all processing and administration. The multi-mode is a distributed mode that can spread some jobs and tasks across a cluster of multiple nodes. Spring XD has some key components, the XD Admin and the XD Container Servers, where the XD Admin will take a DSL command task and send it over to the XD container servers for processing using different types of transports (that can be specified at start time) such as in-memory (default), Redis, and RabbitMQ. Figure 20-1 shows a general Spring XD architecture. Data Processing DSL XD Admin Message Queue Redis RabbitMQ XD Container XD Container Module Module Figure 20-1. Spring XD Runtime Architecture (DIRT – Distributed Integration Runtime) Modules Spring XD supports three types of modules: Taps 278 • Source: This module polls from an external resource or can be triggered by an event and only provides an output. This module is always a stream. Out of the box, Spring XD provides several sources: file, gemfire, rabbit, http, mail, jms, etc. You can see the complete list by executing the command module list on the XD shell (that you run later). • Processor: This module provides some processing (business logic) or transforming; by providing an input and one or more outputs. Out of the box, Spring XD provides several processors such as aggregator, http-client, bridge, filter, json-field-extractor, json-field-value-filter, object-to-json, script, splitter, transform, etc. • Sink: This module only provides one input and outputs the data to an external resource to terminate the stream. Out of the box, Spring XD provides several sinks such as hdfs (Hadoop), file, gemfire-json-server, jdbc, mail, splunk, tcp, aggregatecounter, counter gauge, rabbit, etc. Spring XD provides taps that listen to data while it is being processed by a stream. This is the implementation of the WireTap pattern (enterprise integration patterns) on the Spring Integration module and it is one of the features you are going to use in your Spring application.
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THE EXPERT’S VOICE ® IN SPRING
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Contents at a Glance About the Auth
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Introduction This book is an introd
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Part I Spring Framework Basics The
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Chapter 1 ■ Your First Spring App
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Chapter 2 ■ Working with Classes
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Chapter 3 Applying Different Config
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Chapter 3 ■ Applying Different Co
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Spring Stereotypes Chapter 3 ■ Ap
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Chapter 4 ■ Using Beans Scopes pu
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Chapter 6 ■ Using Resource Files
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Chapter 7 Testing Your Spring Appli
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Chapter 8 Give Advice to Your Sprin
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Chapter 8 ■ Give Advice to Your S
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Chapter 10 ■ Showing Your Spring
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Chapter 11 ■ Integrating Your Spr
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Chapter 12 Exposing a REST API Nowa
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Chapter 12 ■ Exposing a REST API
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HTTP-DELETE Chapter 12 ■ Exposing
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Chapter 13 Adding E-mail and Schedu
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Part III Spring Framework Advanced
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Chapter 15 ■ Spring Data Within Y
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Chapter 16 ■ Messaging with Your
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Page 317 and 318: ■ index Spring application (cont.
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■ Contents ■■Chapter 3: Apply
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■ Contents ■■Chapter 12: Expo
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■ Contents ■■Chapter 20: Your
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About the Author Felipe Gutierrez i
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Acknowledgments I would like to exp
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