Introducing Spring Framework

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Using Spring XD with My Documents Chapter 20 ■ Your First Spring XD Application Enough about concepts! Let’s start playing around with Spring XD. The main idea of using Spring XD within your My Documents Spring application is to get some metrics on the number of PDF documents you are receiving from RabbitMQ. See Figure 20-2 for a general overview of what you need to accomplish. Producer Sends New Document in XML Format RabbitMQ My Documents Spring XD - Stream (RabbitMQ) - Tap (PDF Counter) Figure 20-2. Using Spring XD with the My Documents Application Figure 20-2 shows a basic architecture where you are going to use Spring XD along with the My Documents application. Because you are going to use RabbitMQ, you need to make sure it is up and running. After that, let’s start Spring XD. The following command will start the Spring XD runtime: xd-singlenode --transport rabbit Figure 20-3 shows the output of executing the Spring XD runtime that will use RabbitMQ as messaging queue transport mechanism. Figure 20-3. Running xd-singlenode –transport Rabbit Will Use RabbitMQ as a Messaging Queue Mechanism 279
Chapter 20 ■ Your First Spring XD Application Now let’s start the Spring XD shell. This tool will be used to create the stream and tap that you are going to use to count how many PDFs the My Documents Spring application receives. The Spring XD shell uses a high-level DSL to define all the tasks needed. You can open a new terminal and run the following command to start the Spring XD shell tool, as shown in Figure 20-4: xd-shell Figure 20-4. Spring XD Shell Figure 20-4 shows the Spring XD shell, a tool that will interact with the Spring XD itself. Next, you are going to create the stream that will be listening from the RabbitMQ on one of your queues, in this case the docs-pdf. The following command will create the stream you need: xd:> stream create –-name docs-pdf –-definition "rabbit | log" The above command will create a rabbit stream and it will log all the incoming messages into the console. It is important to note that the name parameter is key and is related to the name of a queue. So the name “docs-pdf” is the name of the queue in RabbitMQ; if this name does not exist in RabbitMQ, it will be created. Next, let’s create the tap that will end in a sink (counter) that will have the number of the PDFs. The following command in the Spring shell will create the tap (see Figure 20-5): xd:> stream create --name pdftap --definition "tap:stream:docs-pdf > counter --name=pdfcount" 280
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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 4 ■ Using Beans Scopes do
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Chapter 5 ■ Working with Collecti
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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 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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Page 315 and 316: ■ index • I I/O operations, 62
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Page 323 and 324: ■ 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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Introducing Spring Framework

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