Assume that the Reverser component will call another

Hi <a class="user-mention notranslate" data-hovercard-type="user" data-hovercard-url="

How to get another component instance in component? about weaver HOT 1 CLOSED

serviceweaver commented on August 17, 2024

How to get another component instance in component?

from weaver.

Comments (1)

mwhittaker commented on August 17, 2024 1

Hi @beacon007, great question. The instance returned by weaver.Init should only be used by your code in main. Other components should not be using it. Instead, a component implementation should use itself as an instance! When you embed weaver.Implements inside a struct, that struct inherits methods that make it implement the Instance interface. You can see an example of one component invoking another here:

weaver/weavertest/internal/simple/simple.go

Lines 32 to 50 in dbe6df4

    
           type Source interface { 
        
           	Emit(ctx context.Context, file, msg string) error 
        
           } 
        
           type source struct { 
        
           	weaver.Implements[Source] 
        
           	dst Destination 
        
           } 
        
           func (s *source) Init(_ context.Context) error { 
        
           	s.Logger().Debug("simple.Init") 
        
           	dst, err := weaver.Get[Destination](s) 
        
           	s.dst = dst 
        
           	return err 
        
           } 
        
           func (s *source) Emit(ctx context.Context, file, msg string) error { 
        
           	return s.dst.Record(ctx, file, msg) 
        
           }

We'll work on improving the documentation on this. I realize the go docs don't show that weaver.Implements implements weaver.Instance. I'll close this issue but feel free to re-open if you have any more questions.

from weaver.

How to get another component instance in component? about weaver HOT 1 CLOSED

Comments (1)

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	type Source interface {
	Emit(ctx context.Context, file, msg string) error
	}

	type source struct {
	weaver.Implements[Source]
	dst Destination
	}

	func (s *source) Init(_ context.Context) error {
	s.Logger().Debug("simple.Init")
	dst, err := weaver.Get[Destination](s)
	s.dst = dst
	return err
	}

	func (s *source) Emit(ctx context.Context, file, msg string) error {
	return s.dst.Record(ctx, file, msg)
	}