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func_transformer.go
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/
func_transformer.go
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package processors
import "github.com/dailyburn/ratchet/data"
// FuncTransformer executes the given function on each data
// payload, sending the resuling data to the next stage.
//
// While FuncTransformer is useful for simple data transformation, more
// complicated tasks justify building a custom implementation of DataProcessor.
type FuncTransformer struct {
transform func(d data.JSON) data.JSON
Name string // can be set for more useful log output
ConcurrencyLevel int // See ConcurrentDataProcessor
}
//NewFuncTransformer instantiates a new instance of func transformer
func NewFuncTransformer(transform func(d data.JSON) data.JSON) *FuncTransformer {
return &FuncTransformer{transform: transform}
}
// ProcessData runs the supplied func and sends the returned value to outputChan
func (t *FuncTransformer) ProcessData(d data.JSON, outputChan chan data.JSON, killChan chan error) {
outputChan <- t.transform(d)
}
// Finish - see interface for documentation.
func (t *FuncTransformer) Finish(outputChan chan data.JSON, killChan chan error) {
}
func (t *FuncTransformer) String() string {
if t.Name != "" {
return t.Name
}
return "FuncTransformer"
}
// Concurrency defers to ConcurrentDataProcessor
func (t *FuncTransformer) Concurrency() int {
return t.ConcurrencyLevel
}