Mastering microservices with java 9 pdf download

Before running an application on Docker container s, you will master testing and securing techniques with Spring Cloud. Knowledge of Java and Spring Framework will be helpful, but no prior exposure to Spring Cloud is required. Apply microservices patterns to build resilient and scalable distributed systems Key Features Understand the challenges of building large-scale microservice landscapes Build cloud-native production-ready microservices with this comprehensive guide Discover how to get the best out of Spring Cloud, Kubernetes, and Istio when used together Book Description Microservices architecture allows developers to build and maintain applications with ease, and enterprises are rapidly adopting it to build software using Spring Boot as their default framework.

This microservices book will take you through tried and tested approaches to building distributed systems and implementing microservices architecture in your organization. The book also demonstrates how to deploy your microservices using Kubernetes and manage them with Istio for improved security and traffic management. No familiarity with microservices architecture is required to get started with this book. Learn to develop, test, and deploy your Spring Boot distributed application and explore various best practices.

Spring Boot simplifies the building of complex software dramatically by reducing the amount of boilerplate code, and by providing production-ready features and a simple deployment model. This book will address the challenges related to power that come with Spring Boot's great configurability and flexibility.

You will understand how Spring Boot configuration works under the hood, how to overwrite default configurations, and how to use advanced techniques to prepare Spring Boot applications to work in production. This book will also introduce readers to a relatively new topic in the Spring ecosystem — cloud native patterns, reactive programming, and applications.

Get up to speed with microservices with Spring Boot and Spring Cloud. Each chapter aims to solve a specific problem or teach you a useful skillset. By the end of this book, you will be proficient in building and deploying your Spring Boot application.

What you will learn Build logically structured and highly maintainable Spring Boot applications Configure RESTful microservices using Spring Boot Make the application production and operation-friendly with Spring Actuator Build modern, high-performance distributed applications using cloud patterns Manage and deploy your Spring Boot application to the cloud AWS Monitor distributed applications using log aggregation and ELK Who this book is for The book is targeted at experienced Spring and Java developers who have a basic knowledge of working with Spring Boot.

The reader should be familiar with Spring Boot basics, and aware of its benefits over traditional Spring Framework-based applications. Master the art of fast, effective Java development with the power of concurrent and parallel programming About This Book Get detailed coverage of important recipes on multi-threading and parallel programming This book takes a close look at the Java 9 APIs and their impact on concurrency See practical examples on thread safety, high-performance classes, safe sharing, and a whole lot more Who This Book Is For The book is for Java developers and programmers at an intermediate to advanced level.

It will be especially useful for developers who want to take advantage of task-based recipes using Java 9's concurrent API to program thread-safe solutions.

Java 9 comes with a host of fantastic features, including significant performance improvements and new APIs. This book will take you through all the new APIs, showing you how to build parallel and multi-threaded applications. The book covers all the elements of the Java Concurrency API, with essential recipes that will help you take advantage of the exciting new capabilities.

You will learn how to use parallel and reactive streams to process massive data sets. Next, you will move on to create streams and use all their intermediate and terminal operations to process big collections of data in a parallel and functional way. Further, you'll discover a whole range of recipes for almost everything, such as thread management, synchronization, executors, parallel and reactive streams, and many more. At the end of the book, you will learn how to obtain information about the status of some of the most useful components of the Java Concurrency API and how to test concurrent applications using different tools.

Style and approach This recipe-based book will allow you to explore the exciting capabilities of concurrency in Java. After reading this book, you will be able to comfortably build parallel applications in Java 9.

Microservices is an architectural style in which large, complex software applications are composed of one or more smaller services. Each of these microservices focuses on completing one task that represents a small business capability.

These microservices can be developed in any programming language. The common patterns and practices of the microservice architecture and their application using the Clojure programming language.

Key Features Relevance of the microservice architecture and benefits of Clojure's functional and simple features to implement it. Learn best practices and common principles to avoid common pitfalls while developing microservices. Learn how to use Pedestal to build your next microservices, secure them using JWT, and monitor them using the ELK stack Book Description The microservice architecture is sweeping the world as the de facto pattern with which to design and build scalable, easy-tomaintain web applications.

This book will teach you common patterns and practices, and will show you how to apply these using the Clojure programming language. This book will teach you the fundamental concepts of architectural design and RESTful communication, and show you patterns that provide manageable code that is supportable in development and at scale in production.

We will provide you with examples of how to put these concepts and patterns into practice with Clojure. This book will explain and illustrate, with practical examples, how teams of all sizes can start solving problems with microservices. You will learn the importance of writing code that is asynchronous and non-blocking and how Pedestal helps us do this. Later, the book explains how to build Reactive microservices in Clojure that adhere to the principles underlying the Reactive Manifesto.

We finish off by showing you various ways to monitor, test, and secure your microservices. By the end, you will be fully capable of setting up, modifying, and deploying a microservice with Clojure and Pedestal. What you will learn Explore the pros and cons of monolithic and microservice architectures Use Clojure to effectively build a reallife application using Microservices Gain practical knowledge of the Clojure Pedestal framework and how to use it to build Microservices Explore various persistence patterns and learn how to use Apache Kafka to build event-driven microservice architectures Secure your Microservices using JWT Monitor Microservices at scale using the ELK stack Deploy Microservices at scale using container orchestration platforms such as Kubernetes Who this book is for You should have a working knowledge of programming in Clojure.

However, no knowledge of RESTful architecture, microservices, or web services is expected. Let's get some background on the way it has evolved over the years. Enterprise architecture evolved more from historic mainframe computing, through client-server architecture 2-tier to n-tier to service-oriented architecture SOA.

So microservice is SOA with emphasis on small ephemeral components. Its recent rise is owing to its popularity and visibility. As we know, change is eternal. Humans always look for better solutions. Today, organizations are using agile methodologies to develop applications; it is a fast paced development environment and is also on a much larger scale after the invention of cloud and distributed technologies.

This app may have many services such as customers, bookings, analytics and so on, as well as regular components such as presentation and database. The following diagram explains the traditional monolithic application design. This design was widely used before SOA became popular:. In traditional monolithic design, everything is bundled in the same archive such as presentation code, application logic and business logic code, and DAO and related code that interacts with the database files or another source.

After SOA, applications started being developed based on services, where each component provides the services to other components or external entities. The following diagram depicts the monolithic application with different services; here services are being used with a presentation component.

All services, the presentation component, or any other components are bundled together:. Here, each component represents autonomy. Each component could be developed, built, tested, and deployed independently.

The API gateway provides the interface where different clients can access the individual services and solve the following problems:. What to do when you want to send different responses to different clients for the same service.

For example, a booking service could send different responses to a mobile client minimal information and a desktop client detailed information providing different details and something different again to a third-party client. After observing all the sample design diagrams, which are very high-level designs, you might find out that in monolithic design, the components are bundled together and tightly coupled. All the services are part of the same bundle. Similarly, in the second design figure, you can see a variant of the first figure where all services could have their own layers and form different APIs, but, as shown in the figure, these are also all bundled together.

Each service has its own layers and DB and is bundled in a separate archive. These APIs are ready to consume. For this reason, it provides various advantages over its monolithic counterpart. I would still remind you that there are some exceptional cases where monolithic app development is highly successful, like Etsy, and peer-to-peer e-commerce web applications. Monolithic applications, which are large when scaled, scale everything as all the components are bundled together.

For example, in the case of a restaurant table reservation application, even if you would like to scale the table-booking service, it would scale the whole application; it cannot scale the table-booking service separately.

It does not utilize the resource optimally. In addition, this scaling is one-dimensional. Running more copies of the application provides scale with increasing transaction volume. An operation team could adjust the number of application copies that were using a load-balancer based on the load in a server farm or a cloud.

As we mentioned previously, when it is needed, you can scale just the table-booking service without affecting any of the other components. It also allows two-dimensional scaling; here we can not only increase the transaction volume but also the data volume using caching Platform scale. A development team can then focus on the delivery and shipping of new features, instead of worrying about the scaling issues Product scale.

Since, monolithic applications are either bundled in the same archive or contained in a single directory, they prevent the deployment of code modularity. For example, many of you may have experienced the pain of delaying rolling out the whole release due to the failure of one feature. It's a very flexible and productive approach. You can divide your app based on different domains such as products, payments, cart and so on, and package all these components as separate packages.

Now, let's see how that helps you. Let's say that after a production release launching new features, enhancements, and bug fixes, you find flaws in the payment service that need an immediate fix. Monolithic applications are mostly developed and enhanced based on the technologies primarily used during the initial development of a project or a product.

It makes it very difficult to introduce new technology at a later stage of the development or once the product is in a mature state for example, after a few years. In addition, different modules in the same project that depend on different versions of the same library make this more challenging. Technology is improving year on year. For example, your system might be designed in Java and then, a few years later, you want to develop a new service in Ruby on rails or NodeJS because of a business need or to utilize the advantages of new technologies.

It would be very difficult to utilize the new technology in an existing monolithic application. What do you do when you want to send different responses to different clients for the same service? For example, a booking service could send different responses to a mobile client minimal information and a desktop client detailed information providing different details, and something different again to a third-party client.

After observing all the sample design diagrams, which are very high-level designs, you might find out that in monolithic design, the components are bundled together and tightly coupled.

All the services are part of the same bundle. Similarly, in the second design figure, you can see a variant of the first figure where all services could have their own layers and form different APIs, but, as shown in the figure, these are also all bundled together.

Conversely, in microservices , design components are not bundled together and have loose coupling. Each service has its own layers and DB , and is bundled in a separate archive. These APIs are ready to consume. For this reason, it provides various advantages over its monolithic counterpart.

I would still remind you that there are some exceptional cases where monolithic application development is highly successful, such as Etsy, and peer-to-peer e-commerce web applications. Monolithic applications that are large when scaled, scale everything as all the components are bundled together.

For example, in the case of a restaurant table reservation application, even if you would like to scale the table-booking service, it would scale the whole application; it cannot scale the table-booking service separately.

It does not utilize the resources optimally. In addition, this scaling is one-dimensional. Running more copies of the application provides the scale with increasing transaction volume. An operation team could adjust the number of application copies that were using a load-balancer based on the load in a server farm or a cloud.

Microservices gives the flexibility to scale only those services where scale is required and it allows optimal utilization of the resources. As we mentioned previously, when it is needed, you can scale just the table-booking service without affecting any of the other components. It also allows two-dimensional scaling; here we can not only increase the transaction volume, but also the data volume using caching Platform scale.

A development team can then focus on the delivery and shipping of new features, instead of worrying about the scaling issues Product scale. Microservices could help you scale platform, people, and product dimensions as we have seen previously. People scaling here refers to an increase or decrease in team size depending on microservices ' specific development and focus needs. Microservice development using RESTful web-service development makes it scalable in the sense that the server-end of REST is stateless; this means that there is not much communication between servers, which makes it horizontally scalable.

Since monolithic applications are either bundled in the same archive or contained in a single directory, they prevent the deployment of code modularity. For example, many of you may have experienced the pain of delaying rolling out the whole release due to the failure of one feature. To resolve these situations, microservices gives us the flexibility to rollback only those features that have failed. It's a very flexible and productive approach.

For example, let's assume you are the member of an online shopping portal development team and want to develop an application based on microservices.

You can divide your application based on different domains such as products, payments, cart, and so on, and package all these components as separate packages. Now, let's see how that helps you. Let's say that after a production release launching new features, enhancements, and bug fixes, you find flaws in the payment service that need an immediate fix.

Since the architecture you have used is based on microservices , you can rollback the payment service instead of rolling back the whole release, if your application architecture allows, or apply the fixes to the microservices payment service without affecting the other services. Monolithic applications are mostly developed and enhanced based on the technologies primarily used during the initial development of a project or a product.

It makes it very difficult to introduce new technology at a later stage of the development or once the product is in a mature state for example, after a few years. In addition, different modules in the same project, that depend on different versions of the same library, make this more challenging.

Technology is improving year on year. For example, your system might be designed in Java and then, a few years later, you want to develop a new service in Ruby on Rails or NodeJS because of a business need or to utilize the advantages of new technologies. It would be very difficult to utilize the new technology in an existing monolithic application. It is not just about code-level integration, but also about testing and deployment.

It is possible to adopt a new technology by re-writing the entire application, but it is time-consuming and a risky thing to do. On the other hand, because of its component-based development and design, microservices gives us the flexibility to use any technology, new or old, for its development.

It does not restrict you to using specific technologies, it gives a new paradigm to your development and engineering activities. So, how is it achieved? Well, it's very simple. M icroservices -based application code does not bundle into a single archive and is not stored in a single directory.

A new service could be developed in an isolated environment and could be tested and deployed without any technical issues. As you know, microservices also owns its own separate processes; it serves its purpose without any conflict such as shared resources with tight coupling, and processes remain independent. Since a microservice is by definition a small, self-contained function, it provides a low-risk opportunity to try a new technology. That is definitely not the case where monolithic systems are concerned.

You can also make your microservice available as open source software so it can be used by others, and if required it may interoperate with a closed source proprietary one, which is not possible with monolithic applications. There is no question that monolithic applications can be developed using Agile practices, and these are being developed. You will also understand Spring Security implementation.

You will require Bootstrap JS libraries to build a prototype of a web application that will consume microservices to show data and flow of sample project—a small utility project. Chapter 9, Best Practices and Common Principles, talks about microservice design principles. You will learn an effective way of developing microservices and how Netflix has implemented microservices.

Chapter 10, Troubleshooting Guide, explains the common problems encountered during the development of microservices and their solutions.

This will help you follow the book smoothly and would make learning swift. Chapter 11, Migrating a Monolithic Application to a Microservice-Based Application, shows you how to migrate a monolithic application to a microservice-based application. Who this book is for This book is for Java developers who are familiar with microservice architectures and now wants to take a deeper dive into effectively implementing microservices at an enterprise level.

A reasonable knowledge of core microservice elements and applications is expected.