winforms data matrix reader

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Figure 1-3. Applying the Service Locator pattern to reduce lookup complexity Applying the Service Locator pattern can help to separate the lookup logic from your components, and hence reduce the lookup complexity of your components. This pattern can also increase the reusability of your components in different environments with different lookup mechanisms. Remember that it is a common design pattern used in resource (not only component) lookup.

Before you start creating your EJB component, you might like to have a simple EJB container for testing purposes. For simplicity s sake, we have chosen Apache OpenEJB (http://openejb.apache.org/) as the EJB container, which is very easy to install, configure, and deploy. OpenEJB is an open source EJB container. OpenEJB was designed for the Apache Geronimo server project (http://geronimo.apache.org/), but you don t need Apache Geronimo to run OpenEJB.

Table 4-1. Duration, Resource, and Cost Estimates for the Project s Activities Activity Resources Project sponsor Key business owner Requirements Design Construction System Testing User Testing Rework Project Management TOTAL 1 business analyst 1 software architect 4 developers 1 tester 1 end user 4 developers

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When your component needs an external resource, such as a data source or a reference to another component, the most direct and sensible approach is to perform a lookup. Let s consider this motion an active lookup. The shortcoming of this kind of lookup is that your component needs to know about resource retrieval, even though you have used a service locator to encapsulate the lookup logic.

Note You can download OpenEJB Standalone Server (e.g., v3.1.1) from the OpenEJB web site and extract it to a directory of your choice to complete the installation.

A better solution to resource retrieval is to apply IoC. The idea of this principle is to invert the direction of resource retrieval. In a traditional lookup, components seek resources by making requests to a container, and the container duly returns the resources in question. With IoC, the container itself actively delivers resources to its managed components. A component has only to choose a way of accepting the resources. This could be described as a passive form of lookup. IoC is a general principle, while DI is a concrete design pattern that embodies this principle. In the DI pattern, a container is responsible for injecting appropriate resources into each component in some predetermined way, such as via a setter method.

To apply the DI pattern, your ReportService may expose a setter method to accept a property of the ReportGenerator type. package com.apress.springrecipes.report; public class ReportService { private ReportGenerator reportGenerator; // No need to look up actively public void setReportGenerator(ReportGenerator reportGenerator) { this.reportGenerator = reportGenerator; } public void generateAnnualReport(int year) { ... } public void generateMonthlyReport(int year, int month) { ... } public void generateDailyReport(int year, int month, int day) { ... } }

First, let s create the EJB component without Spring s support. To allow remote access to this EJB component, you expose the following remote interface to clients.

For example, you can write the following ProductCreator class by using a configurable map to store the predefined products. The createProduct() instance factory method finds a product by looking up the supplied productId in the map. If there is no product matching this ID, it will throw an IllegalArgumentException. package com.apress.springrecipes.shop; ... public class ProductCreator { private Map<String, Product> products; public void setProducts(Map<String, Product> products) { this.products = products; } public Product createProduct(String productId) { Product product = products.get(productId); if (product != null) { return product; } throw new IllegalArgumentException("Unknown product"); } }

Note To compile and build your EJB component, you have to include the library that contains standard EJB classes and interfaces in your classpath. For OpenEJB 3.1.1, it s javaee-api-5.0-2.jar (located in the lib directory of the OpenEJB installation).

Cost N/A N/A $7,500 $20,800 $138,600 $6,100 $4,300 $27,700 $34,700 $239,700

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