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![Application Class - Bundle
public class BlogApplication extends Application<BlogConfiguration> {
public static void main(String[] args) throws Exception {
new BlogApplication().run(args);
}
@Override
public void initialize(Bootstrap<BlogConfiguration> bootstrap) {
bootstrap.addBundle(hibernateBundle);
bootstrap.addBundle(new ViewBundle());
bootstrap.addBundle(new AssetsBundle("/assets/js", "/js", null, "js"));
}}](https://image.slidesharecdn.com/dropwizardintroduction-140920083916-phpapp02/75/Dropwizard-Introduction-28-2048.jpg)
Uploaded byAnthony Chen
Dropwizard Introduction
Dropwizard is a Java framework for building RESTful web services. It supports microservices architecture and includes modules for common functions like authentication, database access, metrics collection, and health checks. Developers define resources, configure the application via YAML, integrate with databases via JDBI, and build representations with Jackson. It aims to provide a productive full-stack framework for building microservices.
Dropwizard Introduction
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- 2. Once Upon aTime Hibernate Tomcat Spring JPA Spring MVC Jackson Freemarker or Thymeleaf Logback
- 3. Dropwizard Full StackFramework with microservice architecture
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- 6. Jackson mustache JDBI Full Stack, RESTful and Open Source
- 7. Dropwizard Modules (v0.7.1) dropwizard-assets dropwizard-jackson dropwizard-migrations dropwizard-auth dropwizard-jdbi dropwizard-servlets dropwizard-client dropwizard-jersey dropwizard-spdy dropwizard-configuration dropwizard-jetty dropwizard-testing dropwizard-core dropwizard-lifecycle dropwizard-util dropwizard-db dropwizard-logging dropwizard-validation dropwizard-example dropwizard-metrics-ganglial dropwizard-views-freemarker dropwizard-forms dropwizard-metrics-graphite dropwizard-views-mustache dropwizard-hibernate dropwizard-metrics dropwizard-views
- 8. Microservice Architecture Themicroservice architectural style is an approach to developing a single application as a suite of small services, each running in its own process and communicating with lightweight mechanisms, often an HTTP resource API. These services are built around business capabilities and independently deployable by fully automated deployment machinery. - Martin Fowler
- 9. Monolithic Micro Services pid 1234 8GB heap pid 5678 2GB heap pid 5978 2GB heap pid 1234 2GB heap pid 9527 2GB heap
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- 12. P R O X Y Extensibility
- 13. Phlyty a microframeworkusing ZF2 components. SleepyA RESTful framework for Go Microservice Frameworks
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- 16. Dropwizard - Pros Productivity – Do one thing at a time Do your best with what you have Simple & Lightweight Easy Test, Deployment and Management Performance
- 17. Dropwizard - Pros Productivity – Do one thing at a time Do your best with what you have Simple & Lightweight Easy Test, Deployment and Management Performance
- 18.
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- 21. Dropwizard - Cons Frequently and Large-Scale Changes Nano-Service Architecture Complexity at Infrastructure Level No Application Server Put More Effort on Monitoring and
- 22. How to Start DropWizard?
- 23. Overview Resource ApplicationBundle Configuration Representation Environment Views
- 24. Project Orginization com.example.myapplication: api: Representations. cli: Commands client: Client implementation for your application core: Domain implementation jdbi: Database access classes health: Health Checks resources: Resources MyApplication: The application class MyApplicationConfiguration: configuration class
- 25. Configuration Class publicclass BlogConfiguration extends Configuration { @Valid @NotNull @JsonProperty("database") private DataSourceFactory database = new DataSourceFactory(); public DataSourceFactory getDatabase() { return database; }}
- 26. Configuration File (YAML) server: type: simple applicationContextPath: /application adminContextPath: /admin database: driverClass: com.mysql.jdbc.Driver user: anthonychen password: anthonychen url: jdbc:mysql://localhost:3306/blog validationQuery: "/* MyApplication Health Check */ SELECT 1"
- 27. Representation Class publicclass Notification { private String text; public Notification(String text) { this.text = text; } @JsonProperty public String getText() { return text; } @JsonProperty public void setText(String text) { this.text = text; }}
- 28. Application Class -Bundle public class BlogApplication extends Application<BlogConfiguration> { public static void main(String[] args) throws Exception { new BlogApplication().run(args); } @Override public void initialize(Bootstrap<BlogConfiguration> bootstrap) { bootstrap.addBundle(hibernateBundle); bootstrap.addBundle(new ViewBundle()); bootstrap.addBundle(new AssetsBundle("/assets/js", "/js", null, "js")); }}
- 29. Application Class –Environment @Override public void run(BlogConfiguration configuration, Environment environment) throws Exception { // Crete DAOs final ArticleDAO articleDAO = new ArticleDAO(hibernateBundle.getSessionFactory()); final UserDAO userDAO = new UserDAO(hibernateBundle.getSessionFactory()); // Create healthchecks final SessionFactoryHealthCheck dbHealthCheck = new SessionFactoryHealthCheck( hibernateBundle.getSessionFactory(), configuration.getDatabase().getValidationQuery() ); // Register resources, filters and healthchecks environment.jersey().register(new BlogResource(configuration.getSiteName(), articleDAO)); environment.jersey().register(new ArticleResource(articleDAO, userDAO)); environment.healthChecks().register("databaseHealthcheck", dbHealthCheck); }}
- 30. View Layer Freemarker- http://freemarker.org Mustache - http://mustache.github.io
- 31. Health Check publicclass DatabaseHealthCheck extends HealthCheck { private final Database database; public DatabaseHealthCheck(Database database) { this.database = database; } @Override protected Result check() throws Exception { if (database.isConnected()) { return Result.healthy(); } else { return Result.unhealthy("Cannot connect to " + database.getUrl()); } } }
- 32. Demo- A SampleBlog
- 33. Build - AFat JAR An easy maintainable, single deployable artifact maven-shade or maven-assembly-plugin
- 34. Run Command line: java -jar blog-sample-0.0.1-SNAPSHOT.jar server blog.yml exec-maven-plugin
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Editor's Notes
- #17 單一應用程式可以拆解為數個小型服務，以符合各自的需求，也容易了解、修改與維護 與舊系統整合，老酒裝新瓶，無須大幅翻新 可以針對負擔較重的服務特別擴充其資源 可以只佈署個別服務，而不用每次均佈署整個應用程式 每個服務無須使用相同的程式語言 --> 殺雞焉用牛刀 每個服務都可以有自己的小開發團隊 強迫程式設計師面對佈署與了解服務整合需求 收斂程式語言與框架的多樣性
- #18 單一應用程式可以拆解為數個小型服務，以符合各自的需求，也容易了解、修改與維護 與舊系統整合，老酒裝新瓶，無須大幅翻新 可以針對負擔較重的服務特別擴充其資源 可以只佈署個別服務，而不用每次均佈署整個應用程式 每個服務無須使用相同的程式語言 --> 殺雞焉用牛刀 每個服務都可以有自己的小開發團隊 強迫程式設計師面對佈署與了解服務整合需求 收斂程式語言與框架的多樣性
- #22 避免變成奈米服務架構 nano-service architecture 服務間變得更鬆散，依賴性降低，程式庫的版本會更難管裡 (如果要管理的話) 程式語言平台環境可能變得很複雜
- #37 避免變成奈米服務架構 nano-service architecture 服務間變得更鬆散，依賴性降低，程式庫的版本會更難管裡 (如果要管理的話) 程式語言平台環境可能變得很複雜