百度网盘下载地址链接（百度云）下载：Spring Integration Essentials PDF 高清 电子 lockfollolatu.ml 密码: ar9基本信息作者：Chandan Pandey出版社：Packt Publishing L. Integrate the heterogeneous endpoints of enterprise applications with Spring Integration for effective communication In Detail This book begins with an. Sep 22, PDF Books File Spring Integration Essentials (PDF, ePub, Docs) by Chandan Pandey Read Online Full Free.
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This book is intended for developers who are either already involved with enterprise integration or planning to venture into the domain. Basic knowledge of Java. Mapping between JMS and Spring Integration messages Comparing ing how Spring Integration represents them is an essential foundation for building. Spring Integration Essentials - Sample Chapter - Free download as PDF File .pdf ), Text File .txt) or read online for free. Chapter No. 1 Getting Started Integrate.
A rip and replace strategy would not work; rather, this should be done in a homogenous way without disturbing the sanity of existing modules during the transitions. Integration of these modules either inside organizations or with external partners is inherently complex, requiring integration of heterogeneous endpoints.
This is the kind of scenario that Enterprise Application Integration tries to address. Enterprise Integration Patterns EIP is a collection of standard enterprise challenges and how can they be handled. How enterprise integration challenges can be solved Many approaches have been tried to make the integration simple without compromising on vital aspects of enterprise, such as security, transaction, availability, reliability, and so on.
Under the hood, they try to solve integration issues through one of the following techniques:. Shared File: This is the simplest approach. Systems can write data in a predefined format to a file, which can be read by other endpoints. An adapter might be needed to convert a format between two different endpoints. Let's consider an example, a daily report used to be generated in a CSV file.
Over time, the organization established a web presence and reports need to be pushed online now. How can this be achieved? The simplest way is to dump it in files that will be read by an adapter and fed into the CMS system.
A filesystem is simple but not the best solution; it is not transactional. What if a particular file is corrupt, or what if at poll interval files are not available due to network failure? This necessitates the introduction of a complex system that has a retry mechanism, filter capabilities, and many more nonfunctional aspects such as secure access, archival, and so on.
Shared database: This addresses a few of the challenges that are addressed by the filesystem, such as transactional behavior, role-based access, performance tuning, distributed support, and so on.
The common mechanism is a set of join tablesone application writes data in a schema that is understood by others. On the flip side, this introduces tight coupling; if there is a change in schema, both the systems need to be updated accordingly.
Evolving applications will become a challenge, as they will have to factor in the external system limitations. The integration effort might itself start with lot of hiccups, for example, compatibility issues between the SQL provided by database vendors of the application, data format, and types in their table.
For example, if one system stores only the date while the other stores the date with time stamp, depending on need, at least one will have to change format. Remote procedure calls: This mechanism introduces a paradigm where each system can offer services by publishing the contract.
These paradigms can be a method, parameters, result, and error. For example, an EJB service or a SOAP service can be exposed for providing raw data for a reporting module that renders it in multiple formats. The most limiting aspect is synchronous behavior, where systems have to wait for the result. There are other challenges such as serialization of data, network latency, performance issues of a module, which can bring down the whole application, and so on.
From a security aspect, exposing the method name and parameter invites hackers to exercise their creativity. This introduces the asynchronous model in which two heterogeneous modules can interact through data over a predefined connection.
The greatest advantage is decouplingnone of the systems are dependent on the availability of the other and they can participate or withdraw from integration without impacting other components. JMS is an example of message-based integration.
Spring Integration is based on this paradigm where multiple endpoints connect on to a channel, produce or consume messages, and perform further processing based on information in a message. We will deal with channel, endpoints, message payload, and other concepts in the upcoming chapters.
Even if we use one of the preceding techniques, enterprise systems are way outward from each other and all of them might not be working all the time. This necessitated the use of middleware that can orchestrate reliable communication between these disparate endpoints, typically called an Enterprise Service Bus ESB.
In layman's terms, ESB can be defined as the middle man who enables communication to and fro between heterogeneous interfaces. Who are the players? Over time, the need for open source frameworks became evident as smaller organizations grew.
Their integration needs were limited and were incapable of investing upfront with any of these biggies. A comprehensive comparison of these frameworks is beyond the scope of this book but a small summary of two other major open source frameworks, has been provided here for the sake of emphasizing Spring Integration simplicity:. Mule ESB: It is a standard server, solutions are developed and deployed inside them.
Mule is one of the most prominent and stable solutions on the market. The point to be observed here is that, it's a container that holds the application. Service Mix SM: Since it tries to address a lot of modules, it is pretty bulky compared to Spring Integration.
Why Spring Integration? Spring Integration is an open source effort to address integration challenges; it is based on the Spring Framework, which is the most widely used Java-based framework in organizations.
It introduces the simple POJO-based programming model to support standard integration patterns. It's lightweight; all it needs is couple of jars for which Maven targets are readily available.
Spring Integration is just a set of standard Java libraries; the solution gets deployed in the application instead of that application getting deployed in some containers, as in the case of SM and Mule. For enterprises that are already using Java and Spring, it eases the integration effort as it follows the same idioms and patterns of the Spring Framework. This will help overcome configuration nightmares and warm up developers to a hands-on experience. Chapter 2, Message Ingestion, introduces channels through which messages can be read and processed.
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It describes the point-to-point and pub-sub models, which one is best suited for a given scenario, how errors can be handled in a decoupled manner on a channel, and finally how in-memory channels can be backed up with persistence for failover and recovery solutions.
Chapter 3, Message Processing, explains how to define components that can apply business logic on messages, introduces decoupled logging that can used for auditing, and discusses adding transactional behavior. Chapter 4, Message Transformers, deals with processing message formats, its conversion to a homogenous format, and how annotations can help keep the configurations clean.
Messages can be introduced in heterogeneous formats such as XML, JSON, and so on that need to be converted to a format understood by the system. Chapter 5, Message Flow, will introduce flow aspects to messages such as filtering messages that do not comply to validation rules, routing them to an error branch, splitting messages, and redirecting them to components appropriate for their processingwaiting for incomplete payloads, aggregating partial messages, and finally the chaining of business processing handlers.
Get unlimited access to videos, live online training, learning paths, books, tutorials, and more. Start Free Trial No credit card required. Spring Integration Essentials 2 reviews. View table of contents. Start reading. Book Description Integrate the heterogeneous endpoints of enterprise applications with Spring Integration for effective communication In Detail This book begins with an introduction to the enterprise integration landscape, the challenges, the approaches that have been tried, and how Spring Integration can help address these issues.
What You Will Learn Set up your Spring tool suite IDE to get the best support possible for Spring Integration Discover how messages can be consumed from external sources Understand the different ways in which a message can be processed once it is inside the system Transform messages from one format to another Orchestrate message flow across endpoints Use Spring Integration components to connect to external systems such as databases, FTP servers, social networking sites, and process batch jobs Test and scale up your Spring Integration application to monitor and manage its performance Downloading the example code for this book.
Message, and then pushes the Message onto the newLeadChannel. The Lead instance is the Message body, or payload, and Spring Integration wraps the Lead because only Messages are allowed on the bus.
We need to wire up our message bus. Figure 4 shows how to do that with an application context configuration file. Listing 4. The reason is that we're using this configuration file strictly for Spring Integration configuration, so we can save some keystrokes by selecting the appropriate namespace. This works pretty nicely for some of the other Spring projects as well, such as Spring Batch and Spring Security.
In this configuration we've created the three messaging components that we saw in figure 3. First, we have an incoming lead gateway to allow applications to push leads onto the bus. We simply reference the interface from listing 3; Spring Integration takes care of the dynamic proxy. This is the channel that the Gateway annotation referenced in listing 3. A pub-sub channel can publish a message to multiple endpoints simultaneously.
For now we have only one subscriber—a service activator—but we already know we're going to have others, so we may as well make this a pub-sub channel.
The service activator is an endpoint that allows us to bring our LeadServiceImpl service bean onto the bus. We're injecting the newLeadChannel into the input end of the service activator. When a message appears on the newLeadChannel, the service activator will pass its Lead payload to the leadService bean's createLead method.
Stepping back, we've almost implemented the design described by figure 3. The only part that remains is the lead creation frontend, which we'll address right now. Create the web tier Our user interface for creating new leads will be a web-based form that we implement using Spring Web MVC.
The idea is that enrollment staff at campuses or call centers might use such an interface to handle walk-in or phone-in traffic. Listing 5 shows our simple Controller.
Listing 5. Date;import org. Autowired;import org. Controller;import org. Model;import org. RequestMapping;import org. RequestMethod;import crm. LeadGateway;import crm.
Country;import crm. But the main pieces from a Spring Integration perspective are here. We're autowiring the gateway into the Controller, and we have methods for serving up the empty form and for processing the submitted form.This is the service interface that is used to convert user input to upper case.
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Spring Integration Essentials
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Enterprise Integration Patterns EIP is a collection of standard enterprise challenges and how can they be handled.
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