Transactional File System In Java - Commons Transaction
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The document discusses using the Apache Commons Transaction library to provide transactional file system access in Java applications. It describes a scenario where the library could be used to manage concurrent access to resources and ensure data integrity. Key features and implementation steps of the Commons Transaction library are outlined, including initializing a FileResourceManager, starting a transaction, modifying resources, and transaction management.
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AWS IAM (Identity and Access Management) Policy SimulatorGuo Albert AWS IAM (Identity and Access Management) Policy Simulator 是一款由 AWS 提供的工具，旨在幫助用戶理解和測試所建立的 IAM policy 是否符合預期。
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DBM專案環境建置Guo Albert This document provides instructions for setting up a DBM project environment using Git and Eclipse. It describes how to clone a Git repository containing a DBM project, import the project into Eclipse, and resolve any issues. It also discusses how to get the latest code using pulls, create and switch branches, commit and push code changes, and create merge requests in Gitlab.
JPA Optimistic Locking With @Version
JPA Optimistic Locking With @VersionGuo Albert This document discusses how to implement optimistic locking in JPA by using the @Version annotation to specify a version field or property in an entity class, which JPA will then automatically maintain and increment to check for data changes during updates to prevent stale data issues. An example is provided where two users concurrently try to update the same row, and an OptimisticLockException is thrown for the second user's update since the version value had already been incremented by the first user's successful update.
OCEJPA Study Notes
OCEJPA Study NotesGuo Albert The document discusses various JPA and EJB concepts related to entity relationships, locking, exceptions, and the entity manager. It provides annotations for mapping entity relationships and collections. It defines different lock types in JPA and exceptions that can occur at the JPA, EJB, and transaction levels and whether they cause rollbacks. It also describes how the persistence context is propagated for local EJBs and when the transaction scoped persistence context is created.
OCEJPA(1Z0-898) Preparation Tips
OCEJPA(1Z0-898) Preparation TipsGuo Albert This document provides tips and resources for preparing for the OCEJPA(1Z0-898) exam. It lists the exam topics such as configuring JPA entity classes and using relationships. For preparation, it recommends the book "Pro JPA 2: Mastering the Java Persistence API" and mock exams from Enthuware. It advises to thoroughly review explanations for mock exam questions. Useful discussion forums are also provided.
JPA lifecycle events practice
JPA lifecycle events practiceGuo Albert This document discusses JPA lifecycle events and callback methods. It provides details on the different callback methods like @PrePersist, @PostPersist, etc. and describes what they are used for. It also discusses using entity listeners to attach listener classes to entities to handle lifecycle events. Multiple listener classes can be attached to a single entity class. The example shows using callbacks to automatically write user ID and timestamps to the database on inserts and updates.
XDate - a modern java-script date library
XDate - a modern java-script date libraryGuo Albert XDate is a thin wrapper around JavaScript's native Date object that provides enhanced functionality for parsing, formatting, and manipulating dates
NIG系統報表開發指南
NIG系統報表開發指南Guo Albert This document provides an overview for developing reports in the NIG system. It outlines prerequisites like Java and iReport software. It describes the order to read existing documents and code, and introduces the application architecture layers. An example report for NIG665 is presented with class and sequence diagrams. The document guides exporting reports to PDF and CSV formats from the user interface.
Ease Your Effort of Putting Data into History Table
Ease Your Effort of Putting Data into History TableGuo Albert The document discusses automating the process of recording data modifications in a history table. It proposes overwriting the create, delete, and update methods in the DAO class for the main table to: 1) copy data to the history table entity, 2) set primary key values, and 3) save to the history table via its DAO, in addition to performing the main operation. This allows services to focus only on business logic without managing the history recording.
NIG 系統開發指引
NIG 系統開發指引Guo Albert This document discusses the layering of a web application using Spring MVC. It describes the user interface/web layer, business/service layer, and persistence layer. For each layer it provides details on the Spring components used, classes needed, and responsibilities. It also includes an overview of the Spring MVC architecture and resources for further reading.
Form Bean Creation Process for NIG System
Form Bean Creation Process for NIG SystemGuo Albert This document provides instructions for creating form bean classes from database tables or multiple tables in Java. It outlines the prerequisites, the process which includes mapping UI columns to schema attributes, copying attributes to the form bean class, and generating setters and getters. An example for a single table form bean and multiple table form bean is also provided with steps to check relevant documents, create the class, map attributes, and generate methods.
A Short Intorduction to JasperReports
A Short Intorduction to JasperReportsGuo Albert This document provides an overview of JasperReports, an open source Java reporting library. It discusses prerequisites for using JasperReports, the typical workflow, document sections or "bands", and the JasperReports architecture. Key points include that JasperReports can connect to multiple data sources and output multiple report formats, and that the typical workflow involves getting a data source, reading a Jasper file, generating a JasperPrint object, setting the response content type and header, and exporting the report.
Apply Template Method Pattern in Report Implementation
Apply Template Method Pattern in Report ImplementationGuo Albert The document discusses applying the template method pattern in report implementations. It defines the template method pattern as defining the program skeleton of an algorithm, with subclasses overriding some algorithm steps. It provides an example of an abstract class defining primitive operations for a report generation algorithm, with concrete subclasses implementing the operations. Applying the template method pattern allows report generation behavior to vary by subclass while maintaining a consistent overall structure.
Utilize Commons BeansUtils to do copy object
Utilize Commons BeansUtils to do copy objectGuo Albert Commons BeanUtils allows copying values between Java objects by utilizing standard JavaBeans getter and setter methods. It can be used for building scripting languages, template processors, tag libraries, and consuming XML configuration files by mapping values between objects. The document demonstrated using Commons BeanUtils to copy data from one object to another for tracking record change history in a system.
Apply my eclipse to do entity class generation
Apply my eclipse to do entity class generationGuo Albert This document provides steps for using MyEclipse to generate entity classes from database tables. It involves creating a Java project, adding JPA capabilities, connecting to a database, selecting tables for reverse engineering, assigning source folders and packages, generating entity beans, and reviewing and re-generating the artifacts.
Nig project setup quickly tutorial
Nig project setup quickly tutorialGuo Albert This document provides instructions for setting up an NIG project from an SVN repository in Rational Software Architect. The steps include installing prerequisite plugins, checking out the main "nig" project and its subprojects from the SVN URL, importing the subprojects into the workspace, running a Maven build on the main project, adding the EAR project to WebSphere Application Server, and starting the server to deploy the application.
Spring JDBCTemplate
Spring JDBCTemplateGuo Albert This document discusses how to implement a Spring JDBC template application including creating an ER diagram and class diagram, developing data access objects (DAOs) and a service class, configuring the application context file, and registering beans. It also covers creating business objects, implementing DAO methods for user and contact data, and writing tests for the application classes.
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- 1. Transactional File System in Java – commons transaction Albert Guo [email_address]
- 2. Agenda CMCS Scenario Commons Transaction Commons Transaction Implementation Conclusion
- 4. System Architecture CIS Green Windchill Project Management Document Management Change Management Pro/E Wildfire Pro/E Work Space Pro/E PDMLink Supplier Management GSM Product Management (Part /BOM) Interface Table SAP ERP ProjectLink ODBC xmls, files
- 5. Scenario
- 8. What is Commons Transaction Whenever you have concurrent access to resources and want to protect them with locks, Commons Transaction can be right for you. Providing lightweight, standardized, well tested and efficient implementations of utility classes commonly used in transactional Java programming. The 1.x component is compatible to JDK1.2 .
- 9. Commons Transaction Features Commons Transaction might be useful for you when you need transactional file access (i.e. ACID transactions on a set of files) have resources that need locking - lock managers can do that for you: be sure you never forget to release a lock again let your code have a timer for a whole block of locks have an out-of-the-box solution for hierarchical locks plug in your own custom or advanced solutions
- 13. 2. Initialize FileResourceManager storeDir String - JavaDoc says: "directory where main data should go after commit". workDir String - JavaDoc says: directory where transactions store temporary data. next parameter is a boolean that indicates if the path should be URL encoded. In our example it is false, indicating that we have simple path with no spaces or i18n characters in it. sLogger LoggerFacade - JavaDoc says: the logger to be used by this store.
- 14. 3. Start FileResourceManager & Start Transaction
- 15. 4. Modify Resources With the transaction started, you can begin file manipulation. You can perform following operations: copyResource createResource deleteResource moveResource writeResource In our example, we’ll demo createResource and writeResource
- 18. Conclusion
- 19. Conclusion If you have to operate on files and cannot afford to loose data, seriously consider using commons-transactions package. It is probably better then any custom mechanism you can come up with. It supports 2 phase commit. With a little work, you could probably make it into an XA compliant resource.