Background
In implementation of ESB services, there is a recurring pattern of RequestCommand boilerplate and Provider. This project uses java generic facility to help implement such a pattern so that code duplication is reduced.
Design Artifacts
Implementation is in package org.openeai.jms.consumer.commands, part of openeai.jar
| RequestCommands | Providers | Operations | Required Objects |
|---|---|---|---|
GenericCrudRequestCommand<M extends ActionableEnterpriseObject, Q extends XmlEnterpriseObject, P extends CrudProvider<M, Q>> | CrudProvider,AbstractCrudProvider,ExampleCrudProvider | Query, Create, Update, Delete | M,Q |
GenericGenerateRequestCommand<M extends ActionableEnterpriseObject, R extends XmlEnterpriseObject, P extends GenerateProvider<M, R>> | GenerateProvider,AbstractGenerateProvider,ExampleGenerateProvider | Generate (only) | M,R |
GenericCompleteRequestCommand<M extends ActionableEnterpriseObject, Q extends XmlEnterpriseObject, R extends XmlEnterpriseObject, P extends CompleteProvider<M, Q, R>> | CompleteProvider,AbstractCompleteProvider,ExampleCompleteProvider | Query, Create, Update, Delete, Generate | M,Q,R |
M: message Object
Q: querySpecification Object
R: requisition Object (for Generate operation)
Example: edu.emory.ProviderDemoService
//TestmoaGenericCompleteRequestCommand.java
package edu.emory.testmoa.service;
import org.openeai.config.CommandConfig;
import org.openeai.jms.consumer.commands.GenericCompleteRequestCommand;
import org.openeai.jms.consumer.commands.RequestCommand;
import edu.emory.moa.jmsobjects.examples.v1_0.TestSimpleMoa;
import edu.emory.moa.objects.resources.v1_0.TestSimpleMoaQuerySpecification;
import edu.emory.moa.objects.resources.v1_0.TestSimpleMoaRequisition;
public class TestmoaGenericCompleteRequestCommand extends
GenericCompleteRequestCommand<TestSimpleMoa, TestSimpleMoaQuerySpecification, TestSimpleMoaRequisition, TestMoaCompleteProvider>
implements RequestCommand {
public TestmoaGenericCompleteRequestCommand(CommandConfig cConfig) throws InstantiationException {
super(cConfig);
}
}
//TestMoaCompleteProvider.java
package edu.emory.testmoa.service;
import org.openeai.jms.consumer.commands.provider.ExampleCompleteProvider;
import edu.emory.moa.jmsobjects.examples.v1_0.TestSimpleMoa;
import edu.emory.moa.objects.resources.v1_0.TestSimpleMoaQuerySpecification;
import edu.emory.moa.objects.resources.v1_0.TestSimpleMoaRequisition;
public class TestMoaCompleteProvider
extends ExampleCompleteProvider<TestSimpleMoa, TestSimpleMoaQuerySpecification, TestSimpleMoaRequisition> {}