Servidores de Aplicação: por que ainda precisamos deles?
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Application Servers, Por Que Ainda Precisamos Deles?
Bruno Borges Principal Product Manager Oracle Latin America Agosto, 2014
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• Bruno Borges
– Principal Product Manager, Java Evangelist – Oracle Latin America
– @brunoborges – bruno.borges@oracle.com
Speaker
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• Aplicações em multicamadas
• Clients
– Browsers, Mobile Apps, REST clients, Web Services, Remote EJB Clients (RMI-IIOP)
• Web Tier
– JSP/Servlet, JSF, REST services, Web Services, WebSockets
• Business Tier – EJBs, JMS, JPA, JCA
Arquitetura Java EE Comum – Monolítica
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”If you can't build a Monolith, what makes you think Microservices are the answer? ”
– Simon Brown, Coding the Architecture
bit.ly/ballofmud
µServices
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Java Server-side Containers
ndertow
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Frameworks e Plataformas
Dropwizard
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Management, Monitoring, Config, Container Tools
Shipyard
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Microservices
• Sem dúvida um modelo de arquitetura interessante, “moderno”
• Mas não é novo (SOA)
• Requer alto nível de expertise
– DevOps, Infraestrutura, Deployment, ALM, etc
• Requer integrar diferentes tecnologias e produtos
– Administração e Monitoramento
– Configurações
– Diagnóstico
• Lidar com múltiplos fabricantes
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Source: bit.ly/archcodestyle
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Java Enterprise Edition Platform
Java EE 7
DEVELOPER PRODUCTIVITY
Java EE 7
– Batch
– Concurrency
– Simplified JMS
– More annotated POJOs
– Less boilerplate code
– Cohesive integrated platform – WebSockets
– JSON
– Servlet 3.1 NIO
– REST
MEETING ENTERPRISE DEMANDS
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Application Servers
• Open Source
– GlassFish
– WildFly
– Apache TomEE
• Comerciais
– Oracle WebLogic Server
– IBM WebSphere Application Server
– JBoss
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Application Servers com Dynamic Clustering
Oracle Confidential – Internal/Restricted/Highly Restricted 17
• Aplicações distribuídas escaláveis
• Processamento distribuído JMS
• Administração Centralizada
Configuração Simplificada de Clusters Dynamic Clusters
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Whole Server Migration
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JMS Replicated Store em Memória
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JDBC Statement Cache Adapting on Memory Pressure
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Data Source Connection Shrinking on Memory Pressure
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Do que os App Servers já são capazes?
• Monitoramento de N apps
• Gerenciamento e Coordenação de Recursos
– DB Connections, JMS, Security Providers, Connectors com Legados, Transaction Management (XA)
• ClassLoader Isolation não é mais um problema em app servers
• Clustering, Load Balancing, Fail-over
• Features de Segurança
• Disaster Recovery
• Online Upgrade/Patching
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Arquitetura Java EE Distribuida
• Diversas aplicações
• Modelo SOA
– Serviços REST
– Serviços SOAP
• EJBs remotos distribuidos
• Camada Web desacoplada – Talvez até em outra linguagem
App1
App3
App2
Front-end Web
Serviços REST WebServices SOAP
Back-end
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O que falta para os app servers?
• Gerenciar recursos de SO para completo isolamento das aplicações
App Server
Memória CPU Network IO
App1 App2 App3
Virtualization
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“If you watch the software industry backwards, it starts with kids flailing; ends with old guys solving impossible problems by thinking hard.”
– Gary Bernhardt twitter.com/garybernhardt/status/152455259543961600
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