Implementation Of Logistics Trading System Based On Cloud Service Using Active Service Thought

Software as a Service(SaaS) is a new type of software application model which the users don’t buy but rent software as services. The software service provider develops applications that can be accessed through internet,which are managed and maintained by provider.As the world economic integration,the difference of user demand is becoming more and more apparent, the challenge for the service providers is becoming more and more serious. In order to satisfy tenants’ customization requirements, cloud system should adapt to constantly variable requirements and variety in business area. So, a novel method constructing cloud system in active service SaaS patterns is proposed. Following the guidance of active service thought, the method introduces a series of steps containing service division, constructing service extended structure and so on to help developer analysis and design the whole structure of services and its extensible functions, then, by means of software development based on component and dynamically assembling framework Equinox, services and components are dynamically assembled into complete services for tenants. Finally, to confirm the maneuverability and effectiveness of this flexible method, it is introduced into a communication project.Compared to the traditional SaaS model, active service SaaS model has advantages in scalability,maintainability and stability. Due to changes in market conditions, leading to the disagreement between functionality provided by services and new business needs of the tenants. At this point, to achieve the aim for modifying the functional level of the main services can adopt to add a new component. The whole process is dynamically completed by dynamically assembling framework and does not affect the operation of the system. From the tenants’point of view, as a result of new component,the revised service functions can meet the new business requirements of the tenants who customized it, and will not affect the other tenants to use the original service function. From a technical standpoint, the whole process to update the service functions do not need the original system to make any changes,as long as add new component to meet the requirements,fully in line with "open-closed principle" to ensure the stability of the cloud system.