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Lazy Loading Entities In Views Challenge--Reader's Question And Answer : Adam Bien's We... - 0 views

www.adam-bien.com/...lazy_loading_entities_in_views java javaee6 anti-patterns DesignPatterns lazy-loading EagerFetch JPA
shared by kuni katsuya on 12 Dec 12 - No Cached
  • Lazy Loading Entities In Views
  • class User
  • Address
  • ...10 more annotations...
  • Friend
  • addresses are lazily loaded
  • detached mode already in the controller
  • eagerly loaded
  • It gets ugly pretty quickly
  • JXPath relations
  • Use Fetch Joins they are designed to prefetch lazy relations
  • Anti-Pattern
    • kuni katsuya
      kuni katsuya on 12 Dec 12
       
      DO NOT USE THE OPEN-SESSION-IN-VIEW *ANTI*-PATTERN
  • Use Stateful Session Beans
    • kuni katsuya
      kuni katsuya on 12 Dec 12
       
      do not penalty: death, or at least a public flogging
  • eager load the relations
    • kuni katsuya
      kuni katsuya on 12 Dec 12
       
      just don't hard-code this eager loading behavior by using jpa's FetchType.EAGER when annotating the entity beans if you do, you force all clients of said entity beans to *always* eager fetch everything, even if the client doesn't want/need the full depth/breadth of the object graph to eager load the relations when needed, try fetch joins (see item 5)
5More

Lazy Loading with Flex, BlazeDS and Hibernate | RIA Zone - 0 views

ria.dzone.com/...loading-flex-blazeds-hibernate flex blazeds hibernate lazy-loading
shared by kuni katsuya on 15 May 12 - No Cached
  • Lazy Loading with Flex, BlazeDS and Hibernate
  • By using dpHibernate and lazy loading, none of this extra work is required
  • proxies are sent initially for collections and complex objects, and fetched on-demand when requested by the client
  • ...2 more annotations...
  • Note that dpHibernate doesn't depend on Spring
  • entity classes must implement the org.dphibernate.core.IHibernateProxy interface, both on the Java and Actionscript classes
74More

Chapter 15. Data Management - 1 views

www.graniteds.org/...graniteds.datamanagement.html graniteds tide DataManagement
shared by kuni katsuya on 23 Apr 13 - No Cached
  •  abstractEntity.uid();
    • kuni katsuya
      kuni katsuya on 23 Apr 13
       
      sets the uid before persist
  •  UUID.randomUUID().toString();
  • AbstractEntity 
  • ...70 more annotations...
  • @MappedSuperclass
  • Important things on ID/UID
  • entity lives in three layers:
  • Flex client
  • JPA persistence context
  • database
  • When updating existing entities coming from the database
  • id is defined and is maintained in the three layers during the different serialization/persistence operations
  • when a new entity is being created in any of the two upper layers (Flex/JPA)
  • new entity has no id until it has been persisted to the database
  • most common solution is to
  • have a second persisted id, the uid
  • which is created by the client and persisted along with the entity
  • recommended approach to avoid any kind of subtle problems is to have a real uid property which will be persisted in the database but is not a primary key for efficiency concerns
  • You can now ask Tide to
  • limit the object graph before sending it
  • Flex with the following API :
  • EntityGraphUnintializer
  • uninitializeEntityGraph
  • Person object will be uninitialized
  • uperson contains
  • only the minimum of data
  • to correctly merge your changes in the server persistence context
  • Tide uses the
  • client data tracking
  • to determine which parts of the graph need to be sent
  • Calling the EntityGraphUninitializer manually is a bit tedious and ugly, so there is a cleaner possibility when you are using generated typesafe service proxies
  • annotate your service method arguments with @org.granite.tide.data.Lazy :
  • @Lazy
  • take care that you have added the [Lazy] annotation to your Flex metadata compilation configuration
  • in the Flex application, register the UninitializeArgumentPreprocessor component in Tide as follows :
  • [UninitializeArgumentPreprocessor]
  • all calls to PersonService.save() will
  • automatically use a properly uninitialized version
  • of the person argument.
  • 15.4. Dirty Checking and Conflict Handling
  • simplify the handling of data between Flex and Java EE
  • Chapter 15. Data Management
  • Tide maintains a client-side cache of entity instances and ensures that every instance is unique in the Flex client context
  •  uid().hashCode();
  • Tide currently only supports Integer or Long version fields, not timestamps and that the field must be nullable
  • in a multi-tier environment (@Version annotation)
  • highly recommended to use
  • JPA optimistic locking
  • highly recommended to add a
  • persistent uid field
  • AbstractEntity
  • in general this identifier will be
  • initialized from Flex
  • @Column(name="ENTITY_UID", unique=true, nullable=false, updatable=false, length=36)     private String uid;
  • @Version     private Integer version;
  • uid().equals(((AbstractEntity)o).uid())
  • consistent identifier through all application layers
  • @PrePersist
  • 15.3. Reverse Lazy Loading
  • 15.4. Dirty Checking and Conflict Handling
  • 15.4. Dirty Checking and Conflict Handling
  • 15.4. Dirty Checking and Conflict Handling
  • Dirty Checking and Conflict Handling
  • entity instance can be in two states :
  • Stable
  • Dirty
  • property meta_dirty is
  • bindable
  • could be used
  • to enable/disable a Save button
  • correct way of knowing if any object has been changed in the context, is to use the property meta_dirty of the Tide context
  • tideContext.meta_dirty
  • reliable when using optimistic locking
  • check that its @Version field has been incremented
1More

wrenched - externalization and lazy-loading framework for flex/java projects - Google P... - 0 views

code.google.com/wrenched flex blazeds lazy-loading
shared by kuni katsuya on 15 May 12 - No Cached
  • wrenched externalization and lazy-loading framework for flex/java projects
1More

dphibernate - Flex / BlazeDS Hibernate Adapter, with full lazy loading support - Google... - 0 views

code.google.com/dphibernate flex blazeds hibernate
shared by kuni katsuya on 15 May 12 - Cached
  • dphibernate Flex / BlazeDS Hibernate Adapter, with full lazy loading support
5More

Listing Directory Contents with JDK 1.7 and NIO.2 : Adam Bien's Weblog - 0 views

www.adam-bien.com/...ng_directory_contents_with_jdk java lazy-loading java7 NIO.2
shared by kuni katsuya on 12 Dec 12 - No Cached
2More

Open Session in View | Hibernate | JBoss Community - 0 views

community.jboss.org/...OpenSessionInView java javaee6 anti-patterns DesignPatterns lazy-loading EagerFetch JPA
shared by kuni katsuya on 12 Dec 12 - No Cached
  • Open Session in View
    • kuni katsuya
      kuni katsuya on 12 Dec 12
       
      do not do this!  this be an anti-pattern
9More

Adobe - real time data streaming | Adobe LiveCycle Data Services ES3: Solutions - 0 views

www.adobe.com/...compare.html livecycle es blazeds comparison lcds
shared by kuni katsuya on 18 May 12 - Cached
  • BlazeDS
  • Java NIO high-performance messaging (thousands of clients per CPU) No Yes Real Time Messaging Protocol (RTMP) No Yes Data throttling No Yes Reliable communications
  • Managed remoting
  • ...6 more annotations...
  • Transaction (batch processing)
  • Data paging
  • Lazy loading (on demand)
  • Conflict resolution and synchronization
  • SQL adapter
  • Hibernate adapter No Yes "Fiber-aware" assembler No Yes Offline synchronization framework
9More

Enterprise Architect - UML Design Tools and UML CASE tools for software development - 0 views

www.sparxsystems.com/...index.html enterprise architect uml design tools
shared by kuni katsuya on 16 May 12 - Cached
  • Code Engineering Database Engineering Debug & Visualize Applications MDG Technologies (Create & Use)* Model Driven Architecture (MDA) Project Discussion Forum Replicate .EAP Projects Reverse Engineer Binaries (Java, .NET) Shared Models WSDL Engineering XML Schema (XSD) Engineering
  • Audit Model Changes Baseline Diff/Merge DBMS Repository** Floating Edition Available Lazy Load Scripting with JScript, VBScript and Javascript Security (Role-based) WAN Optimizer
  • BPEL Generation from BPMN diagrams Business Rules Composer Executable Code Generation from Behavioral Models Math Support built into Script Engines
  • ...5 more annotations...
  • Allocated Work Execution Analyzer Menu Test Points Win 32 User Interface Designs Business Process Simulation ***
  • Gap Analysis Model Mail Project Calendar Task Allocations TOGAF Gap Analysis
  • BPEL 2.0 Generation BPMN Simulation SysML 1.2
  • Eclipse Integration
  • Eclipse Link
  • kuni katsuya on 16 May 12
     
    Code Engineering Database Engineering Debug & Visualize Applications MDG Technologies (Create & Use)*
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