The Spring container guarantees that a configured initialization callback is calledimmediately after a bean is supplied with all dependencies. Thus, the initializationcallback is called on the raw bean reference, which means that AOP interceptors and soforth are not yet applied to the bean. A target bean is fully created first andthen an AOP proxy (for example) with its interceptor chain is applied. If the targetbean and the proxy are defined separately, your code can even interact with the rawtarget bean, bypassing the proxy. Hence, it would be inconsistent to apply theinterceptors to the init method, because doing so would couple the lifecycle of thetarget bean to its proxy or interceptors and leave strange semantics when your codeinteracts directly with the raw target bean.
For many extended container features, such as annotation processing and AOP proxying,the BeanPostProcessor extension point is essential.If you use only a plain DefaultListableBeanFactory, such post-processors do notget detected and activated by default. This situation could be confusing, becausenothing is actually wrong with your bean configuration. Rather, in such a scenario,the container needs to be fully bootstrapped through additional setup.
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Spring AOP never strives to compete with AspectJ to provide a comprehensive AOPsolution. We believe that both proxy-based frameworks such as Spring AOP and full-blownframeworks such as AspectJ are valuable and that they are complementary, rather than incompetition. Spring seamlessly integrates Spring AOP and IoC with AspectJ, to enableall uses of AOP within a consistent Spring-based applicationarchitecture. This integration does not affect the Spring AOP API or the AOP AllianceAPI. Spring AOP remains backward-compatible. See the following chapterfor a discussion of the Spring AOP APIs.
Spring AOP can also use CGLIB proxies. This is necessary to proxy classes rather thaninterfaces. By default, CGLIB is used if a business object does not implement aninterface. As it is good practice to program to interfaces rather than classes, businessclasses normally implement one or more business interfaces. It is possible toforce the use of CGLIB, in those (hopefully rare) cases where youneed to advise a method that is not declared on an interface or where you need topass a proxied object to a method as a concrete type.
A Foreman installation will always contain a central foreman instancethat is responsible for providing the Web based GUI, nodeconfigurations, initial host configuration files, etc. However, if theforeman installation supports unattended installations then otheroperations need to be performed to fully automate this process. Thesmart proxy manages remote services and is generally installed with allForeman installations to manage TFTP, DHCP, DNS, Puppet, Puppet CA,Ansible, Salt, and Chef.
To fully manage the commissioning process then a smart proxy will have to manipulate these services, DHCP, DNS, Puppet CA, Puppet and TFTP. These services may exist on separate machines or several of them may be hosted on the same machine. As each smart proxy instance is capable of managing all the of these services, there is only need for one proxy per host.In the special case of a smart proxy managing a Windows DHCP server, the host machine must be running Windows, it does not need to be the Microsoft DHCP server itself.
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