#TP GWT + JPA + Maven

1. project structure :

• tpJPA (Parent Project, package type = pom)
• core (Module : JPA part, package type = jar)
• myBlog (Module GWT part, package type = war)

###2. core Module

• hibernate 4.3.0 Final
• hsqldb 2.2.8
• dto (User+Address(embedded), Category, Blog)
• GenericDao
  • ExecuteAndReturnObjStrategy
  • ExecuteStrategy

code example :

	/**
	 * This method provide a transaction boundary and execute the 
	 * given strategy's method in one transaction context
	 * This method returns a T type object
	 * @param s Strategy callback to execute
	 * @return result obj
	 */
	public <T> T executeAndReturn(ExecuteAndReturnObjStrategy s){
		em = factory.createEntityManager();
		tx = em.getTransaction();
		tx.begin();
		
		T t = s.execute();
		
		tx.commit();
		em.close();
		
		return t;
	}

• UserService, CategorService, BlogService

code example :

public Blog createBlog(final Blog blog){
		return gdao.executeAndReturn(new ExecuteAndReturnObjStrategy(){
			@SuppressWarnings("unchecked")
			@Override
			public Blog execute() {
				
				Map<String, String> params = new HashMap<String, String>();
				params.put("userId", blog.getUser().getUserId());
				User user = gdao.findObj("User.byUserId", params);
				
				params = new HashMap<String, String>();
				params.put("category", blog.getCategory().getCategory());
				Category c = gdao.findObj("Category.byCategory", params);
				
				blog.setUser(user).setCategory(c);
				
				return (Blog) gdao.mergeObj(blog);
			}
		});
	}

• JUnit test code example :

	@Test
	public void transactionBoundaryTest(){
		
		gdao.execute(new ExecuteStrategy(){
			public void execute() {
				
				gdao.persistObj(Utils.makeMockUser("Jiyoung", "Park", "myrenai"));
				
				Map<String, String> params = new HashMap<String, String>();
				params.put("userId", "myrenai");
				User user = gdao.findObj("User.byUserId", params);
				
				assertNotNull(user);
				
				assertEquals(1, gdao.countObj(User.class));
				assertEquals(1, gdao.listAll(User.class).size());
				
				gdao.removeObj(User.class, user.getId());
				
				assertEquals(0, gdao.countObj(User.class));
				
			}
		});
	}

###3. myBlog Module

• Maven project
• gwt(2.6.0) , gwt-maven-plugin(2.6.0)
• fonctions :
  • Sign up
  • Log in
  • Create Category
  • List Category
  • Create Blog
  • List Blog
• GWT Components :
  • Dock Panel
  • Decorator Panel
• Pages :
  • SignUpPage
  • LoginPage
  • CategoryListPage
  • BlogFrame
  • BlogListPage
  • BasePage
  • MainView