java - How to create a composite that uses components from a provider where it should itself be added to? -

java - How to create a composite that uses components from a provider where it should itself be added to? -

the title maybe bit complicated didn't see other way of verbalizing problem.

i'm working on project components initialized loading several files , transforming them java components, others loaded serviceloader alreaddy existing java classes. of these objects mapped provider can retrieved there.

public class provider { private map<string, component> map; public provider() { /* * load files, transform, , add together them map * keys beingness names */ /* * load java components , add together them map * keys beingness names */ } public component getcomponent(string name) { homecoming this.map.get(name); } } public interface component { public number execute(); }

i add together more components straight in java more of composite meaning utilize components loaded provider. hence, must gather required components provider, add together them composite , add together composite provider.

public class composite implements component { private component component1, component2; public composite() { provider provider = new provider(); this.component1 = provider.getcomponent("comp1"); this.component2 = provider.getcomponent("comp2"); } public number execute() { homecoming this.component1.execute() + this.component2.execute(); } }

the composite can added provider adding specific meta-inf file. handled serviceloader.

for me, somehow cyclic dependency. have define, in meta-inf file, java classes should gathered serviceloader. include newly implemented composite well. 1 cannot created long other metrics have been loaded provider.

is there pattern or different approach can utilize solve problem?

more should have chain. instead of creating new instance of provider, in composite, should create interface allow called compositecomponent, extend component , have 1 more method init(provider provider). or may improve show in code:

public interface compositecomponent extends component { void init(provider provider); }

so , in provider:

public component getcomponent(string name) { component component = this.map.get(name); if (component instanceof compositecomponent) { ((compositecomponent)component).init(this); } }

java design-patterns serviceloader