CODEWITHSUNDEEP
javaspringioc-container
Dave Jarvis
Dave Jarvis

Reputation: 31201

Object creation and initialization sequence using Spring

Background

A system has the following high-level steps:

  1. Main. Create the system entry point (e.g., the ReportBean).
  2. Report Factory. Create a class that hides knowledge of how reports are created. As reports are created using a Report Creator, this class can be considered a report factory factory.
  3. Report Creator. Create a class that can instantiate the appropriate class given a specific report type. Report Creators are tightly coupled to a specific reporting tool implementation.
  4. Controller Factory. Create a class that hides knowledge of how controllers are created. For example, if the software development architecture is Servlets-based, then the factory will create a controller that can read parameters, write to streams using the API, and set the fully qualified directory path in which reports are saved.
  5. Parameters Factory. Create a class that hides knowledge of how parameters are converted from user inputs (provided by the controller, which may or may not be strongly typed) to strongly typed report-specific parameters.
  6. Report. Create a class that can execute a report. The reason why the previous steps are necessary is summarized by the following requirements chain:
    (a) The report requires a report type.
    (b) The report type requires an input parameter.
    (c) The input parameters must be populated by the controller.
    (d) The controller integrates with an application framework.

The sequence diagram resembles:

Questions

  1. Can Spring be used to implement such a sequence?
  2. If so, what would be involved in configuring Spring to do so?
  3. If not, what container would you use?

Thank you!

Upvotes: 0

Views: 698

Answers (1)

Nicolas Bousquet
Nicolas Bousquet

Reputation: 4000

Yes spring can do that, this is basic dependency injection. More exactly, you will define dependancies between your services. The exact initialisation order will be the results of theses dependancies.

You can use any valid spring way to do that like annotations or xml configuration file.

Upvotes: 2

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