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turbo_context.go
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turbo_context.go
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package turbo
import (
"container/list"
)
/**
*
*本类主要管理当前注册的所有的事件对应的handler
* ---> forwardhandler---> forwardhandler ---->
* backward+forwardAdapterHandler
* <--- backwardhandler <----backward handler<----
*
*
**/
//-----------------整个Handler的pipeline 组成了一个循环链表
type DefaultPipeline struct {
eventHandler *list.List //event对应的Handler的
hashEventHandler map[string]*list.Element //hash对应的handler
}
//创建pipeline
func NewDefaultPipeline() *DefaultPipeline {
return &DefaultPipeline{
eventHandler: list.New(),
hashEventHandler: make(map[string]*list.Element)}
}
func (self *DefaultPipeline) FireWork(event IForwardEvent) error {
ctx := self.getCtx()
return ctx.handler.HandleEvent(ctx, event)
}
func (self *DefaultPipeline) getCtx() *DefaultPipelineContext {
return self.eventHandler.Front().Value.(*DefaultPipelineContext)
}
func (self *DefaultPipeline) getNextContextByHandlerName(name string) *DefaultPipelineContext {
ctx, ok := self.hashEventHandler[name]
if ok {
next := ctx.Next()
if nil != next {
return next.Value.(*DefaultPipelineContext)
} else {
return nil
}
} else {
return nil
}
}
func (self *DefaultPipeline) getPreContextByHandlerName(name string) *DefaultPipelineContext {
ctx, ok := self.hashEventHandler[name]
if ok {
pre := ctx.Prev()
if nil != pre {
return pre.Value.(*DefaultPipelineContext)
} else {
return nil
}
} else {
return nil
}
}
func (self *DefaultPipeline) RegisteHandler(name string, handler IHandler) {
_, canHandleForward := handler.(IForwardHandler)
_, canHandleBackward := handler.(IBackwardHandler)
ctx := &DefaultPipelineContext{handler: handler,
canHandleForward: canHandleForward,
canHandleBackward: canHandleBackward}
ctx.pipeline = self
currctx := self.eventHandler.PushBack(ctx)
self.hashEventHandler[name] = currctx
log.Infof("DefaultPipeline|RegisteHandler|%s\n", name)
}
//pipeline中处理向后的事件
func (self *DefaultPipeline) handleBackward(ctx *DefaultPipelineContext, event IBackwardEvent) error {
backwardHandler := ctx.handler.(IBackwardHandler)
return backwardHandler.HandleBackward(ctx, event)
}
//pipeline中处理向前的事件
func (self *DefaultPipeline) handleForward(ctx *DefaultPipelineContext, event IForwardEvent) error {
forwardHandler := ctx.handler.(IForwardHandler)
return forwardHandler.HandleForward(ctx, event)
}
//pipeline的尽头处理
func (self *DefaultPipeline) eventSunk(event IEvent) {
// log.Infof("DefaultPipeline|eventSunk|event:%t\n", event)
}
//pipeline处理中间出现错误
func (self *DefaultPipeline) errorCaught(event IEvent, err error) error {
log.Infof("DefaultPipeline|errorCaught|err:%s\n", err)
return err
}
//------------------------当前Pipeline的上下文
type DefaultPipelineContext struct {
handler IHandler //当前上下文的handler
pipeline *DefaultPipeline //默认的pipeline
canHandleForward bool //能处理向前的
canHandleBackward bool //能处理向后的
}
//向后投递
func (self *DefaultPipelineContext) SendForward(event IForwardEvent) {
actualCtx := self.getForwardContext(self, event)
if nil == actualCtx {
//已经没有处理的handler 找默认的handler处理即可
self.pipeline.eventSunk(event)
} else {
err := actualCtx.pipeline.handleForward(actualCtx, event)
//如果处理失败了则需要直接走exception的handler
if nil != err {
self.pipeline.errorCaught(event, err)
}
}
}
//获取forward的上下文
func (self *DefaultPipelineContext) getForwardContext(ctx *DefaultPipelineContext, event IForwardEvent) *DefaultPipelineContext {
nextCtx := ctx.pipeline.getNextContextByHandlerName(ctx.handler.GetName())
for nil != nextCtx {
if nextCtx.canHandleForward &&
nextCtx.handler.AcceptEvent(event) {
return nextCtx
} else {
nextCtx = ctx.pipeline.getNextContextByHandlerName(nextCtx.handler.GetName())
}
}
return nil
}
func (self *DefaultPipelineContext) SendBackward(event IBackwardEvent) {
actualCtx := self.getBackwardContext(self, event)
if nil == actualCtx {
//已经没有处理的handler 找默认的handler处理即可
self.pipeline.eventSunk(event)
} else {
err := actualCtx.pipeline.handleBackward(actualCtx, event)
if nil != err {
self.pipeline.errorCaught(event, err)
}
}
}
//获取backward对应的上线文
func (self *DefaultPipelineContext) getBackwardContext(ctx *DefaultPipelineContext, event IBackwardEvent) *DefaultPipelineContext {
preCtx := ctx.pipeline.getPreContextByHandlerName(ctx.handler.GetName())
for nil != preCtx {
if preCtx.canHandleBackward &&
preCtx.handler.AcceptEvent(event) {
return preCtx
} else {
preCtx = ctx.pipeline.getPreContextByHandlerName(preCtx.handler.GetName())
}
}
return nil
}