4.3. Aspect using S2AopFactory

4.3. Aspect using S2AopFactory
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By the create method of S2AopFactory class, the extended class of an aspect target class is generated and the instance which wove in the aspect is acquired.

S2AopFactory.create(component_class, aspects)

The 1st argument ： Aspect target class

The 2nd argument ： Array of Aspects woven in

As an example, an aspect is applied to the following Service class.

module Example
  class Service
    def add(a, b)
      return a + b
    end
  end
end

TraceInterceptor is aspected to add method of Service class as follws.

require 's2container'
require 'seasar/aop/s2aop-factory'
require 'seasar/aop/aspect'
require 'seasar/aop/pointcut'
require 'example'

interceptor = Seasar::Aop::Interceptor::TraceInterceptor.new
pointcut    = Seasar::Aop::Pointcut.new(/^add$/)
aspect      = Seasar::Aop::Aspect.new(interceptor, pointcut)
service     = Seasar::Aop::S2AopFactory::create(Example::Service, [aspect]).new

p service.add(2, 3)

Interceptor.

Interceptor is a class which implements call method. These next interceptors are attached to S2Aop.

Seasar::Aop::Interceptor::TraceInterceptor
TraceInterceptor is a interceptor for treating trace processing as "Crosscutting Concern".

Pointcut.

Pointcut is a class showing where Interceptor is applied.
Seasar::Aop::Pointcut.new(target)
Regexp, String or Symbol which specify the method used as Pointcut is passed to a constructor argument.

Aspect.

Aspect is a class which associates Interceptor(Advice) and Pointcut.
Seasar::Aop::Aspect.new(interceptor, pointcut)
Interceptor and Pointcut are specified by a constructor argument.

NOTE

This Example is located at "example/example09".

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