Suportando Aplicações Multi-tenancy com Java EE

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Open4education
Suportando Aplicações
Multi-tenancy com Java EE
Rodrigo Cândido da Silva
@rcandidosilva

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Open4education
Agenda
!   Modelos de Serviço
!   SaaS Market
!   Multi-tenancy
!  Desafios
!  Pros and Cons
!  Tipos de Implementação
!   Java EE + Multi-tenancy
!   Segurança + Multi-tenancy
!   Cloud + Multi-tenancy
!   JVM Multi-tenancy

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Modelos de Serviço

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Open4education
SaaS Market

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Open4education
Multi-tenancy
!   Uma única instância
da aplicação
atendendo múltiplos
clientes (tenant)
! Contrário da
arquitetura de
múltiplas instâncias

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Multi-instances vs. Multi-tenant

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Cloud != Multi-tenancy

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Desafios
!   Separação dos dados
!   Personalização
!   Controle de acesso
!   Provisionamento de recursos
!   Integrações
!   Atualização da aplicação
!   Recuperação à falhas

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Pros and Cons
!   Pros
! Reduz o custo de manutenção
! Único código para todos os clientes
! Aumenta a escalabilidade
! Beneficia compartilhamento recursos entre clientes
!   Cons
! Aumenta a complexidade
! Separação por tenant-id
! Maior risco de falhas
! Quebra da aplicação compartilhada para todos clientes
! Reduz a flexibilidade para os clientes

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Open4education
Multi-tenancy
!   4 possíveis níveis implementações
! Nível 1 (Personalizado)
!  [N] aplicações e [N] databases
! Nível 2 (Configurável)
!  [1] aplicação e [N] databases
! Nível 3 (Configurável e eficiente)
!  [N] aplicações e [1] database
! Nível 4 (Escalável, configurável e eficiente)
!  [1] aplicação e [1] database

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Open4education
Nível 1 - Personalizado
!   [N] aplicações e [N] databases

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Nível 2 - Configurável
!   [1] aplicação e [N] databases

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Open4education
Nível 3 - Eficiente
!   [N] aplicações e [1] database

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Nível 4 - Escalável
!   [1] aplicação e [1] database

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Open4education
Java EE + Multi-tenancy
!   Database
!  JPA + Multi-tenancy
!   Customização UI
!  JSF + Multi-tenancy
!   Segurança
!   Java EE 8 com suporte Cloud

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JPA + Multi-tenancy
!   EclipseLink
!  Suporte a multi-tenancy @Multitenant
!  Disponibiliza 3 estratégias
!  @Multitenant(SINGLE_TABLE) – default
!  @Multitenant(TABLE_PER_TENANT)
!  @Multitenant(VPD)
!  Shared Cache by tenant

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EclipseLink SINGLE_TABLE
@Entity
@Table(name=“EMP”)
@Multitenant(SINGLE_TABLE)
@TenantDiscriminatorColumn(name = “TENANT_ID”,
contextProperty = “tenant-id”)
public class Employee {
...
}
HashMap properties = new HashMap();
properties.put("tenant.id", "707");
...
EntityManager em = Persistence
.createEntityManagerFactory(
"multi-tenant”,properties)
.createEntityManager();
<persistence-unit name="multi-tenant">
...
<properties>
<property name="tenant.id"
value="707"/>
...
</properties>
</persistence-unit>

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EclipseLink TABLE_PER_TENANT
<entity class="Employee">
<multitenant type="TABLE_PER_TENANT">
<tenant-table-discriminator type="SCHEMA" context-
property="eclipselink.tenant-id"/>
</multitenant>
<table name="EMP">
...
</entity>
@Entity
@Table(name=“EMP”)
@Multitenant(TABLE_PER_TENANT)
@TenantTableDiscriminator(type=SCHEMA,
contextProperty="eclipselink.tenant-id")
public class Employee {
...
}

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Open4education
EclipseLink VPD
@Entity
@Multitenant
@TenantDiscriminatorColumn(name = "USER_ID",
contextProperty = "tenant.id")
@Cacheable(false)
public class Task implements Serializable {
...
CALL DBMS_RLS.ADD_POLICY
('SCOTT', 'TASK', 'todo_list_policy',
'SCOTT', 'ident_func', 'select, update,
delete'));
<properties>
<property name="eclipselink.session.customizer"
value="example.VPDSessionCustomizer" />
<property name="eclipselink.session-event-listener"
value="example.VPDSessionEventAdapter" />
<property
name="eclipselink.jdbc.exclusive-connection.mode"
value="Always" />
</properties>

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JPA Caching
!   Shared Cache disabled

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JPA Caching
!   Shared Cache by tenant

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JSF + Multi-tenancy
!   Arquitetura extensível
!   Artefatos podem ser encapsulados em JARs
!   Composição at runtime
!   Templates
!   Resource library
!   Look-and-feel customization
!   RenderKit
!   Localization

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JSF Facelets
The Facelets Gazette
Site
Navigation
●Events
●Docs
●Forums
About Contact Site Map
Template File name
_template.html
Insertion points
Resources
css classes, scripts, images

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JSF Multi-templating
contractA
• Declared Templates
• Declared Insertion Points
• Declared Resources
contractB
contractC
<web-app-root>/contracts
contractD
contractE
contractF
JAR files in WEB-INF/lib
contractA
contractB
contractC
<web-app-root>/contracts
contractD
contractE
contractF
JAR files in WEB-INF/lib
Set of available contracts
Facelet 1 Facelet 3Facelet 2
faces-config.xml

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JSF Multi-templating
<html xmlns="http://www.w3.org/1999/xhtml”
xmlns:h="http://java.sun.com/jsf/html”
xmlns:ui="http://java.sun.com/jsf/
facelets">
<body>
<ui:composition template="#{template}”>
...
</ui:composition>
</body>
</html>
<?xml version="1.0" encoding="UTF-8"?>
<web-app>
<context-param>
<param-name>javax.faces.view.TEMPLATE</param-
name>
<param-value>mybusiness</param-value>
</context-param>
</web-app>

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Segurança + Multi-tenancy
!   PicketLink
!  Java EE security framework
!  Identity Management (IDM)
!  Federation support (SAML, OAuth2, OpenID)
!  Social Login support
!  Multi-tenancy support

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Picketlink

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Picketlink
@Named
public class RealmSelector implements
Serializable {
@Inject
private PartitionManager partitionManager;
private Realm realm;
@Produces
@PicketLink
public Realm select() {
return this.realm;
}
…
}
@RequestScoped
public class LoginController {
@Inject
private Identity identity;
public String login() {
this.identity.login();
…
}
public String logout() {
this.identity.logout();
return "/home.xhtml";
}
}
public class Resources {
public enum REALM {acme, umbrella,
wayne}
@Produces
@Named("supportedRealms")
public Enum[] supportedRealms() {
return REALM.values();
}

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Cloud + Multi-tenancy
!   Namespace API
! com.google.appengine.api.NamespaceManager
! Suporte aos seguintes serviços
!  Google Datastore
! Memcached
!  Task Queue
!  Search

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Namespace API
// Filter to set the Google Apps
// domain as the namespace.
public class NamespaceFilter implements javax.servlet.Filter {
@Override
public void doFilter(ServletRequest req, ServletResponse res,
FilterChain chain) throws IOException, ServletException {
// Make sure set() is only called if the current namespace is not
already set.
if (NamespaceManager.get() == null) {
NamespaceManager.set(NamespaceManager.getGoogleAppsNamespace());
}
}
}
// Assuming there is a logged in user.
namespace = UserServiceFactory.getUserService()
.getCurrentUser().getUserId();
NamespaceManager.set(namespace);
<filter>
<filter-name>NamespaceFilter</filter-name>
<filter-class>package.NamespaceFilter</filter-class>
</filter>
<filter-mapping>
<filter-name>NamespaceFilter</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>

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Namespace API
!   Search
// Set the current namespace to "aSpace"
NamespaceManager.set("aSpace");
// Create a SearchService with the namespace "aSpace"
SearchService searchService =
SearchServiceFactory.getSearchService();
// Create a MemcacheService that uses the namespace "abc".
MemcacheService explicit =
MemcacheServiceFactory.getMemcacheService("abc");
explicit.put("key", value); // stores value in namespace "abc"
// Increment the count for the current namespace asynchronously.
QueueFactory.getDefaultQueue().add(
TaskOptions.Builder.url("/_ah/update_count")
.param("countName", "SomeRequest"));
!   Memcached
!   Task Queue

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Open4education
JVM + Multi-tenancy
!   Multi-tenancy no nível da JVM
!   IBM SDK JVM
!   Static field isolation
!   Controle by tenant
!   CPU time
!   Heap size
!   Thread count
!   File IO, Socket IO
!   Limitações
!   Java Native Interface (JNI)
!   JVMT (Tool interface)
!   GUI Libraries (GWT, Swing, etc)
!   EXPERIMENTAL !!!

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JVM + Multi-tenancy

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Perguntas
?

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Referências
! http://msdn.microsoft.com/en-us/library/aa479086.aspx
! https://developers.google.com/appengine/docs/java/multitenancy/
! http://www.ibm.com/developerworks/java/library/j-multitenant-java/index.html
! http://www.eclipse.org/eclipselink/documentation/2.4/jpa/extensions/
a_multitenant.htm
! http://2012.con-fess.com/sessions/-/details/122/JSF-and-JavaEE-7-for-multi-
tenant-applications
! http://jdevelopment.nl/jsf-22/
! http://picketlink.org
! https://developers.google.com/appengine/docs/java/multitenancy/
! http://www.jboss.org/quickstarts/picketlink/picketlink-authentication-idm-multi-
tenancy/
! http://wiki.eclipse.org/EclipseLink/Examples/MySports

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Obrigado!
@rcandidosilva
rodrigocandido.me

Suportando Aplicações Multi-tenancy com Java EE

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