Explain how producers start work/send events on demand
Explain how producers start work/send events on demand

on99/ReactiveCocoa,monkeydbobo/ReactiveCocoa,tzongw/ReactiveCocoa,dskatz22/ReactiveCocoa,hbucius/ReactiveCocoa,AndyZhaoHe/ReactiveCocoa,ddc391565320/ReactiveCocoa,yaoxiaoyong/ReactiveCocoa,Liquidsoul/ReactiveCocoa,goodheart/ReactiveCocoa,towik/ReactiveCocoa,taylormoonxu/ReactiveCocoa,mxxiv/ReactiveCocoa,bscarano/ReactiveCocoa,WEIBP/ReactiveCocoa,pzw224/ReactiveCocoa,richeterre/ReactiveCocoa,mtxs007/ReactiveCocoa,victorlin/ReactiveCocoa,CCOOOOLL/ReactiveCocoa,calebd/ReactiveCocoa,pzw224/ReactiveCocoa,liufeigit/ReactiveCocoa,victorlin/ReactiveCocoa,ztchena/ReactiveCocoa,huiping192/ReactiveCocoa,j364960953/ReactiveCocoa,RuiAAPeres/ReactiveCocoa,cogddo/ReactiveCocoa,DreamHill/ReactiveCocoa,KJin99/ReactiveCocoa,yaoxiaoyong/ReactiveCocoa,natestedman/ReactiveCocoa,tonyli508/ReactiveCocoa,andersio/ReactiveCocoa,icepy/ReactiveCocoa,wpstarnice/ReactiveCocoa,xiaoliyang/ReactiveCocoa,stupidfive/ReactiveCocoa,cnbin/ReactiveCocoa,gengjf/ReactiveCocoa,kevin-zqw/ReactiveCocoa,zhaoguohui/ReactiveCocoa,smilypeda/ReactiveCocoa,ohwutup/ReactiveCocoa,loupman/ReactiveCocoa,200895045/ReactiveCocoa,longv2go/ReactiveCocoa,yytong/ReactiveCocoa,hbucius/ReactiveCocoa,emodeqidao/ReactiveCocoa,bensonday/ReactiveCocoa,jackywpy/ReactiveCocoa,sugar2010/ReactiveCocoa,jackywpy/ReactiveCocoa,stevielu/ReactiveCocoa,CQXfly/ReactiveCocoa,xiaoliyang/ReactiveCocoa,cogddo/ReactiveCocoa,tiger8888/ReactiveCocoa,sandyway/ReactiveCocoa,zxq3220122/ReactiveCocoa,nikita-leonov/ReactiveCocoa,AlanJN/ReactiveCocoa,calebd/ReactiveCocoa,nickcheng/ReactiveCocoa,mattpetters/ReactiveCocoa,ReactiveCocoa/ReactiveSwift,fhchina/ReactiveCocoa,add715/ReactiveCocoa,alvinvarghese/ReactiveCocoa,lixar/ReactiveCocoa,chieryw/ReactiveCocoa,jeelun/ReactiveCocoa,msdgwzhy6/ReactiveCocoa,zhukaixy/ReactiveCocoa,eyu1988/ReactiveCocoa,luerhouhou/ReactiveCocoa,paulyoung/ReactiveCocoa,JohnJin007/ReactiveCocoa,windgo/ReactiveCocoa,tornade0913/ReactiveCocoa,takeshineshiro/ReactiveCocoa,jrmiddle/ReactiveCocoa,yoichitgy/ReactiveCocoa,AlanJN/ReactiveCocoa,BrooksWon/ReactiveCocoa,fanghao085/ReactiveCocoa,GuitarPlayer-Ma/ReactiveCocoa,zhigang1992/ReactiveCocoa,dz1111/ReactiveCocoa,BrooksWon/ReactiveCocoa,luerhouhou/ReactiveCocoa,cstars135/ReactiveCocoa,yonekawa/ReactiveCocoa,clg0118/ReactiveCocoa,isghe/ReactiveCocoa,stevielu/ReactiveCocoa,yonekawa/ReactiveCocoa,Farteen/ReactiveCocoa,liufeigit/ReactiveCocoa,yizzuide/ReactiveCocoa,JackLian/ReactiveCocoa,kaylio/ReactiveCocoa,victorlin/ReactiveCocoa,huiping192/ReactiveCocoa,cstars135/ReactiveCocoa,Ricowere/ReactiveCocoa,JohnJin007/ReactiveCocoa,shuxiashusheng/ReactiveCocoa,BrooksWon/ReactiveCocoa,LHDsimon/ReactiveCocoa,zhigang1992/ReactiveCocoa,KJin99/ReactiveCocoa,xiaobing2007/ReactiveCocoa,ddc391565320/ReactiveCocoa,shuxiashusheng/ReactiveCocoa,vincentiss/ReactiveCocoa,dz1111/ReactiveCocoa,windgo/ReactiveCocoa,nikita-leonov/ReactiveCocoa,lixar/ReactiveCocoa,Ethan89/ReactiveCocoa,ReactiveCocoa/ReactiveSwift,DongDongDongDong/ReactiveCocoa,tonyarnold/ReactiveCocoa,wpstarnice/ReactiveCocoa,zzqiltw/ReactiveCocoa,KuPai32G/ReactiveCocoa,nickcheng/ReactiveCocoa,200895045/ReactiveCocoa,kaylio/ReactiveCocoa,tiger8888/ReactiveCocoa,jsslai/ReactiveCocoa,xiaobing2007/ReactiveCocoa,mattpetters/ReactiveCocoa,FelixYin66/ReactiveCocoa,libiao88/ReactiveCocoa,qq644531343/ReactiveCocoa,clg0118/ReactiveCocoa,fhchina/ReactiveCocoa,RuiAAPeres/ReactiveCocoa,ddc391565320/ReactiveCocoa,taylormoonxu/ReactiveCocoa,tonyli508/ReactiveCocoa,yoichitgy/ReactiveCocoa,vincentiss/ReactiveCocoa,msdgwzhy6/ReactiveCocoa,sdhzwm/ReactiveCocoa,chieryw/ReactiveCocoa,wangqi211/ReactiveCocoa,hilllinux/ReactiveCocoa,jeelun/ReactiveCocoa,kiurentu/ReactiveCocoa,PSPDFKit-labs/ReactiveCocoa,zhukaixy/ReactiveCocoa,zhigang1992/ReactiveCocoa,walkingsmarts/ReactiveCocoa,ikesyo/ReactiveCocoa,juliangrosshauser/ReactiveCocoa,Ethan89/ReactiveCocoa,AlanJN/ReactiveCocoa,wangqi211/ReactiveCocoa,Juraldinio/ReactiveCocoa,dskatz22/ReactiveCocoa,on99/ReactiveCocoa,JackLian/ReactiveCocoa,andersio/ReactiveCocoa,zhenlove/ReactiveCocoa,AndyZhaoHe/ReactiveCocoa,j364960953/ReactiveCocoa,itschaitanya/ReactiveCocoa,KuPai32G/ReactiveCocoa,lixar/ReactiveCocoa,brasbug/ReactiveCocoa,esttorhe/ReactiveCocoa,eyu1988/ReactiveCocoa,stevielu/ReactiveCocoa,tornade0913/ReactiveCocoa,WEIBP/ReactiveCocoa,natestedman/ReactiveCocoa,Ethan89/ReactiveCocoa,almassapargali/ReactiveCocoa,natan/ReactiveCocoa,isghe/ReactiveCocoa,richeterre/ReactiveCocoa,shaohung001/ReactiveCocoa,tonyli508/ReactiveCocoa,RuiAAPeres/ReactiveCocoa,Pingco/ReactiveCocoa,PSPDFKit-labs/ReactiveCocoa,sdhzwm/ReactiveCocoa,yangyangluoluo/ReactiveCocoa,Ricowere/ReactiveCocoa,jam891/ReactiveCocoa,OnTheWay1988/ReactiveCocoa,CQXfly/ReactiveCocoa,ShawnLeee/ReactiveCocoa,yytong/ReactiveCocoa,dachaoisme/ReactiveCocoa,towik/ReactiveCocoa,mtxs007/ReactiveCocoa,Pingco/ReactiveCocoa,xumaolin/ReactiveCocoa,leelili/ReactiveCocoa,zhiwen1024/ReactiveCocoa,huiping192/ReactiveCocoa,ShawnLeee/ReactiveCocoa,mattpetters/ReactiveCocoa,KuPai32G/ReactiveCocoa,zzzworm/ReactiveCocoa,GuitarPlayer-Ma/ReactiveCocoa,andersio/ReactiveCocoa,walkingsmarts/ReactiveCocoa,yangshengchaoios/ReactiveCocoa,shaohung001/ReactiveCocoa,ioshger0125/ReactiveCocoa,chao95957/ReactiveCocoa,sdhzwm/ReactiveCocoa,sandyway/ReactiveCocoa,takeshineshiro/ReactiveCocoa,icepy/ReactiveCocoa,cstars135/ReactiveCocoa,hj3938/ReactiveCocoa,leelili/ReactiveCocoa,ioshger0125/ReactiveCocoa,dullgrass/ReactiveCocoa,cogddo/ReactiveCocoa,monkeydbobo/ReactiveCocoa,dachaoisme/ReactiveCocoa,esttorhe/ReactiveCocoa,SanChain/ReactiveCocoa,xiaobing2007/ReactiveCocoa,itschaitanya/ReactiveCocoa,fhchina/ReactiveCocoa,hj3938/ReactiveCocoa,sujeking/ReactiveCocoa,loupman/ReactiveCocoa,GuitarPlayer-Ma/ReactiveCocoa,ericzhou2008/ReactiveCocoa,bscarano/ReactiveCocoa,libiao88/ReactiveCocoa,Farteen/ReactiveCocoa,tornade0913/ReactiveCocoa,Eveian/ReactiveCocoa,dullgrass/ReactiveCocoa,ikesyo/ReactiveCocoa,sujeking/ReactiveCocoa,Eveian/ReactiveCocoa,buildo/ReactiveCocoa,beni55/ReactiveCocoa,chieryw/ReactiveCocoa,luerhouhou/ReactiveCocoa,llb1119/test,goodheart/ReactiveCocoa,tiger8888/ReactiveCocoa,yizzuide/ReactiveCocoa,almassapargali/ReactiveCocoa,esttorhe/ReactiveCocoa,jsslai/ReactiveCocoa,JackLian/ReactiveCocoa,goodheart/ReactiveCocoa,towik/ReactiveCocoa,llb1119/test,howandhao/ReactiveCocoa,jam891/ReactiveCocoa,nickcheng/ReactiveCocoa,mtxs007/ReactiveCocoa,ericzhou2008/ReactiveCocoa,shaohung001/ReactiveCocoa,Liquidsoul/ReactiveCocoa,sujeking/ReactiveCocoa,zzqiltw/ReactiveCocoa,dz1111/ReactiveCocoa,xumaolin/ReactiveCocoa,jam891/ReactiveCocoa,ReactiveCocoa/ReactiveSwift,longv2go/ReactiveCocoa,taylormoonxu/ReactiveCocoa,jrmiddle/ReactiveCocoa,yaoxiaoyong/ReactiveCocoa,cnbin/ReactiveCocoa,jeelun/ReactiveCocoa,FelixYin66/ReactiveCocoa,bensonday/ReactiveCocoa,beni55/ReactiveCocoa,cnbin/ReactiveCocoa,gengjf/ReactiveCocoa,smilypeda/ReactiveCocoa,ztchena/ReactiveCocoa,CQXfly/ReactiveCocoa,fanghao085/ReactiveCocoa,zxq3220122/ReactiveCocoa,xulibao/ReactiveCocoa,itschaitanya/ReactiveCocoa,monkeydbobo/ReactiveCocoa,brasbug/ReactiveCocoa,buildo/ReactiveCocoa,leichunfeng/ReactiveCocoa,natan/ReactiveCocoa,PSPDFKit-labs/ReactiveCocoa,chao95957/ReactiveCocoa,yangyangluoluo/ReactiveCocoa,qq644531343/ReactiveCocoa,zhenlove/ReactiveCocoa,Farteen/ReactiveCocoa,tonyarnold/ReactiveCocoa,ohwutup/ReactiveCocoa,rpowelll/ReactiveCocoa,Eveian/ReactiveCocoa,WEIBP/ReactiveCocoa,zzzworm/ReactiveCocoa,rpowelll/ReactiveCocoa,DongDongDongDong/ReactiveCocoa,dachaoisme/ReactiveCocoa,ztchena/ReactiveCocoa,yangshengchaoios/ReactiveCocoa,add715/ReactiveCocoa,ceekayel/ReactiveCocoa,natan/ReactiveCocoa,ceekayel/ReactiveCocoa,stupidfive/ReactiveCocoa,liufeigit/ReactiveCocoa,llb1119/test,kiurentu/ReactiveCocoa,SuPair/ReactiveCocoa,CCOOOOLL/ReactiveCocoa,zhukaixy/ReactiveCocoa,AndyZhaoHe/ReactiveCocoa,hilllinux/ReactiveCocoa,add715/ReactiveCocoa,Pingco/ReactiveCocoa,jsslai/ReactiveCocoa,mxxiv/ReactiveCocoa,LHDsimon/ReactiveCocoa,ceekayel/ReactiveCocoa,zhaoguohui/ReactiveCocoa,buildo/ReactiveCocoa,chao95957/ReactiveCocoa,zhenlove/ReactiveCocoa,nickcheng/ReactiveCocoa,paulyoung/ReactiveCocoa,hoanganh6491/ReactiveCocoa,walkingsmarts/ReactiveCocoa,kevin-zqw/ReactiveCocoa,sandyway/ReactiveCocoa,esttorhe/ReactiveCocoa,hilllinux/ReactiveCocoa,xulibao/ReactiveCocoa,richeterre/ReactiveCocoa,paulyoung/ReactiveCocoa,eyu1988/ReactiveCocoa,ericzhou2008/ReactiveCocoa,CCOOOOLL/ReactiveCocoa,leichunfeng/ReactiveCocoa,ohwutup/ReactiveCocoa,ShawnLeee/ReactiveCocoa,OneSmallTree/ReactiveCocoa,jackywpy/ReactiveCocoa,kiurentu/ReactiveCocoa,hoanganh6491/ReactiveCocoa,DreamHill/ReactiveCocoa,zhaoguohui/ReactiveCocoa,leelili/ReactiveCocoa,kevin-zqw/ReactiveCocoa,sugar2010/ReactiveCocoa,yizzuide/ReactiveCocoa,alvinvarghese/ReactiveCocoa,SuPair/ReactiveCocoa,yytong/ReactiveCocoa,bensonday/ReactiveCocoa,zhiwen1024/ReactiveCocoa,clg0118/ReactiveCocoa,bscarano/ReactiveCocoa,yonekawa/ReactiveCocoa,zxq3220122/ReactiveCocoa,emodeqidao/ReactiveCocoa,huiping192/ReactiveCocoa,calebd/ReactiveCocoa,kaylio/ReactiveCocoa,Liquidsoul/ReactiveCocoa,brasbug/ReactiveCocoa,Juraldinio/ReactiveCocoa,DreamHill/ReactiveCocoa,pzw224/ReactiveCocoa,LHDsimon/ReactiveCocoa,ioshger0125/ReactiveCocoa,hj3938/ReactiveCocoa,isghe/ReactiveCocoa,fanghao085/ReactiveCocoa,zzqiltw/ReactiveCocoa,dullgrass/ReactiveCocoa,j364960953/ReactiveCocoa,DongDongDongDong/ReactiveCocoa,smilypeda/ReactiveCocoa,xulibao/ReactiveCocoa,BlessNeo/ReactiveCocoa,takeshineshiro/ReactiveCocoa,shuxiashusheng/ReactiveCocoa,jrmiddle/ReactiveCocoa,hoanganh6491/ReactiveCocoa,beni55/ReactiveCocoa,howandhao/ReactiveCocoa,zzzworm/ReactiveCocoa,longv2go/ReactiveCocoa,sugar2010/ReactiveCocoa,SanChain/ReactiveCocoa,juliangrosshauser/ReactiveCocoa,emodeqidao/ReactiveCocoa,OnTheWay1988/ReactiveCocoa,loupman/ReactiveCocoa,libiao88/ReactiveCocoa,vincentiss/ReactiveCocoa,hbucius/ReactiveCocoa,mxxiv/ReactiveCocoa,msdgwzhy6/ReactiveCocoa,leichunfeng/ReactiveCocoa,JohnJin007/ReactiveCocoa,on99/ReactiveCocoa,SanChain/ReactiveCocoa,howandhao/ReactiveCocoa,windgo/ReactiveCocoa,SuPair/ReactiveCocoa,xumaolin/ReactiveCocoa,OnTheWay1988/ReactiveCocoa,wangqi211/ReactiveCocoa,nikita-leonov/ReactiveCocoa,xiaoliyang/ReactiveCocoa,dskatz22/ReactiveCocoa,BlessNeo/ReactiveCocoa,gengjf/ReactiveCocoa,Juraldinio/ReactiveCocoa,yoichitgy/ReactiveCocoa,FelixYin66/ReactiveCocoa,OneSmallTree/ReactiveCocoa,tzongw/ReactiveCocoa,qq644531343/ReactiveCocoa,Ricowere/ReactiveCocoa,yangyangluoluo/ReactiveCocoa,juliangrosshauser/ReactiveCocoa,rpowelll/ReactiveCocoa,icepy/ReactiveCocoa,Ricowere/ReactiveCocoa,yangshengchaoios/ReactiveCocoa,tonyarnold/ReactiveCocoa,alvinvarghese/ReactiveCocoa,natestedman/ReactiveCocoa,stupidfive/ReactiveCocoa,OneSmallTree/ReactiveCocoa,almassapargali/ReactiveCocoa,tzongw/ReactiveCocoa,wpstarnice/ReactiveCocoa,zhiwen1024/ReactiveCocoa,200895045/ReactiveCocoa,KJin99/ReactiveCocoa,BlessNeo/ReactiveCocoa