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pipeline.go
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pipeline.go
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// Copyright (c) nano Author and TFG Co. All Rights Reserved.
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in all
// copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
// SOFTWARE.
package pipeline
import "context"
var (
// BeforeHandler contains the functions to be called before the handler method is executed
BeforeHandler = &pipelineChannel{}
// AfterHandler contains the functions to be called after the handler method is executed
AfterHandler = &pipelineAfterChannel{}
)
type (
// HandlerTempl is a function that has the same signature as a handler and will
// be called before or after handler methods
HandlerTempl func(ctx context.Context, in interface{}) (out interface{}, err error)
// AfterHandlerTempl is a function for the after handler, receives both the handler response
// and the error returned
AfterHandlerTempl func(ctx context.Context, out interface{}, err error) (interface{}, error)
pipelineChannel struct {
Handlers []HandlerTempl
}
pipelineAfterChannel struct {
Handlers []AfterHandlerTempl
}
)
// PushFront should not be used after pitaya is running
func (p *pipelineChannel) PushFront(h HandlerTempl) {
Handlers := make([]HandlerTempl, len(p.Handlers)+1)
Handlers[0] = h
copy(Handlers[1:], p.Handlers)
p.Handlers = Handlers
}
// PushBack should not be used after pitaya is running
func (p *pipelineChannel) PushBack(h HandlerTempl) {
p.Handlers = append(p.Handlers, h)
}
// Clear should not be used after pitaya is running
func (p *pipelineChannel) Clear() {
p.Handlers = make([]HandlerTempl, 0)
}
// PushFront should not be used after pitaya is running
func (p *pipelineAfterChannel) PushFront(h AfterHandlerTempl) {
Handlers := make([]AfterHandlerTempl, len(p.Handlers)+1)
Handlers[0] = h
copy(Handlers[1:], p.Handlers)
p.Handlers = Handlers
}
// PushBack should not be used after pitaya is running
func (p *pipelineAfterChannel) PushBack(h AfterHandlerTempl) {
p.Handlers = append(p.Handlers, h)
}
// Clear should not be used after pitaya is running
func (p *pipelineAfterChannel) Clear() {
p.Handlers = make([]AfterHandlerTempl, 0)
}