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This chapter will cover each of these tools, discussing the strengths and weaknesses of each one so that you may determine what is appropriate for your application

The previous chapter introduced the four core SCA concepts: services, components, composites, and the domain In this chapter, we explore these in practice by providing a walkthrough of creating a composite and deploying it to a domain For those wanting to do hands-on development, this chapter also covers using the open source SCA runtime, Fabric3, to deploy and run the composite This chapter teaches you the basics of building an SCA application, including the following: How to create components that offer services How to con gure those components and wire them together as part of a composite How to expose a service as a web service How to package and deploy the composite to a domain During this exercise, we touch on key SCA design principles and introduce recommended development practices Subsequent chapters will build on the examples presented here, including designing loosely coupled services, asynchronous communications, and conversational interactions In these later chapters, we will also cover how to integrate SCA with presentation- and data-tier frameworks

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Delayed Job1 is a robust background processing library that is essentially a highly configurable priority queue It provides various approaches to handling asynchronous actions, including:

example of a type-checking false positive The problem can be fixed by introducing an explicit type cast, which is the programmer s way of overriding the default type inference behavior

Custom background jobs Permanently marked background methods Background execution of methods at runtime

By default Delayed Job relies on Active Record to store all queue related operations and requires a relational database to store job information However, it can be configured to use other persistence frameworks, as well as other non-relational databases Supported options are:

DataMapper MongoMapper (for use with MongoDB) CouchREST (for use with CouchDB)

Example 21 A type-checking false positive: These Java statements do not meet type safety rules even though they are logically correct

Throughout the book, we use a ctitious bank BigBank Lending to construct an enterprise-class SCA application The SCA application we ultimately will build is designed to process loan applications from customers submitted via a web front-end and by independent mortgage brokers via a web service The high-level application architecture is illustrated in Figure 21

Add the delayed_job gem to your application s Gemfile, then run the generator to create your execution and migration scripts

This will create the database migration that will need to be run to set up the delayed_jobs table in the database, as well as a script to run Delayed Job If you are using MongoMapper or CouchREST as the persistence framework, you may run the command with a --skip-migration option supplied since no migration will be needed To change the default settings for Delayed Job, first add a delayed_jobrb in your config/initializers directory Options then can be configured by calling various methods on Delayed::Worker, which include settings for changing the behavior of the queue with respect to tries, timeouts, maximum run times, sleep delays and other options

10 11 12 13 short s = 0; int i = s; /* the type checker allows this */ short r = i; /* false positive: this will cause a type checking error at compile time */

Analysis of the time spent in database operations versus rendering The HTTP status code and URL of the response sent back to the client

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$ javac barjava barjava:12: possible loss of precision found : int required: short short r = i; /* false positive: this will cause a ^ 1 error

Presentation Tier Direct Web Site Web Services To Brokers Back Office Work Flow BackOffice Composite

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