第三步，定义和实现ICustomerService

    在公共bundle com.ibm.petstore.common中定义服务接口com.ibm.petstore.common.service. ICustomerService：

    清单6. ICustomerService定义

public interface ICustomerService {
   
    public void buyProduct(IProduct product,int accountNo,String password,String email) throws TeamRepositoryException;

}

    在com.ibm.petstore.common的plugin.xml中添加ICustomerService的声明：

    清单7. ICustomerService声明

<service
           kind="RPC"
           name="ICustomerService"
           uri="com.ibm.petstore.common.service.ICustomerService"
           version="1">
</service>

    在服务bundle com.ibm.petstore.service中添加类com.ibm.petstore.service.CustomerService实现ICustomerService接口：

    清单8. CustomerService

public class CustomerService extends AbstractService implements ICustomerService {

    public void buyProduct(IProduct product, int accountNo, String password,
                       String email) throws TeamRepositoryException {
       
        IProcessServerService processServerService =
getService(IProcessServerService.class);
        ITeamArea teamArea = getTeamArea("PetStoreUserTeam");
       
        if(teamArea==null)
            throw new TeamRepositoryException(
                      "petstore user team doesn't exist");
       
        IServerProcess serverProcess = processServerService
                .getServerProcess(teamArea);
       
        BuyPetOperation buyOperation = new BuyPetOperation(teamArea, accountNo,
                password, product.getPrice(), email);

        serverProcess.adviseAndExecute(buyOperation);
    }
   
    ……
}

    注意：在buyProduct方法中通过IServerProcess的adviceAndExecute方法调用了operation"buy"。

    在com.ibm.petstore.service的plugin.xml中将ICustomerService及其实现类绑定：

    清单9. ICustomerService与实现类的绑定

<serviceProvider
            componentId="com.ibm.petstore"
            implementationClass="com.ibm.petstore.service.CustomerService">
         <provides>
            <providedService
                  interface="com.ibm.petstore.common.service.ICustomerService">
            </providedService>
         </provides>
         <prerequisites>
            <requiredService
                  interface="com.ibm.team.repository.common.service.IQueryService">
            </requiredService>
            <requiredService
                  interface="com.ibm.team.repository.service.IRepositoryItemService">
            </requiredService>
            <requiredService
                  interface="com.ibm.team.process.service.IProcessServerService">
            </requiredService>
         </prerequisites>
</serviceProvider>

    注意：这里对于IProcessServerService的依赖。