TheOne仿真器問題集

1、1. infocom2006(完整版/切割版在bubblerap中無法正常執(zhí)行，跑一個(gè)小時(shí)後/會在connection up =>. =cwindowcentrality 的 getglobalcentrality 中發(fā)生 n u 11 poi nterexception 程式錯(cuò)誤，如 i、2525.378021:9.821/s2585.478557：8.931/s2645.679088：8.811/s2705.779571：8.041/s2765.780138：9.451/s2825.780682：9.061/s2885.881245：9.371/s2945.981741:8.251/

2、s3006.082306：9.401/s3066.182953：101.7?1/s3126.183899:15.761/s3186.185493：26 561/s3246.187032：25.651/s3306.188572：25 661/s3366.289962：23.141/s3426.391118：19 251/s3486.392728：26.831/s3546.397807：84 641/s3606.3102666:80.98 1/s3666.3107190:75.40 1/s3726.3112762:92.86 1/sexception in thread "nain&qu

3、ot; jaua.lang.nullpointerexceptionat routing-communitycwindowcentrality-getglobalcentrality<cwindowcentrality.jaua：144>at routing.connunity.distributedbubblerap-getgiobalcentrality<distribute dbubblerap.jaua：265>at routing.connunity.distributedbubblerap.shouldsendmessagetohost<distri

4、butedbubblerap.jaua：221>at routing.decisionenginerouter.cbangedconnection<decisionenginerouter.jpcmhqst c< networklt?aua：223>corecoreat conconnectionup<dtnhost2zia: 15? at core - netviorki ntfiw duu -uuiihcbt hetworkl nterf ace .java: 235 at interfacesinplebi*oadcast interface .create

5、connect ion<sinplebroadcast i terface.jaua：113>at core-dtnhost.forceconnection<dtnhost.java:305at input.connectionecesseuent<connectionevent.jaua：46>at core.world.update(world.java:179at ui.dtnsintextui.runsin<dtnsimtextui.java：29> at ui.dtnsinui.start<dtnsinui.jaua：7

6、7>在於:原本的cwindowcentrality的getglobalcentrality中沒有做例外處理，修改後即4.for (map.entry<dtnhost, list<duration» entry : conr for (map.entry<dtnhostz list<duration» entry : connhistorydtnhost h = entry.getkey();for(duration d : entry.getvalue()int timepassed = (int)(timenow - d.end)/ if w

7、e reached the end of the last epoch,if(timepassed > centrality_time_window * elbreak;dtnhost h = entry.getkey();for(duration d : entry.getvalue()tryint timepassed = (int)(timenowd.end)/ compute the epoch this contact belongs tepoch = timepassed / centrality time window/ if we reached the end of t

8、he last epoch, weif(timepassed > centrality time window * epochbreak;/ only consider each node once per epochset<dtnhost> nodesalreadycounted = nodescoi if(nodesalreadycounted.contains(h)continue;/ compute the epoch this contact belongs toepoch = timepassed / centrality time window;/ only c

9、onsider each node once per epochset<dtnhost> nodesalreadycounted = nodescountec if(nodesalreadycounted.contains(h)continue;/ increment the degree for the given epoch centralitiesepoch+; nodesalreadycounted.add(h);/ increment the degree for the given epochcentralitiesepoch+;nodesalreadycounted.

10、add(h);ltch(nullpointerexception e)continue;修改前（壞掉）修改後（正常）2. infocom2006 在 bubblerap 中會造成 nullpointerexception 問題（此爲(wèi)bubblerap本身設(shè)計(jì)造成的bug,而修正此bug後的one版本都會標(biāo)記"修正版"） 原因：當(dāng) buffersize 設(shè) 3m messagesize 設(shè) 25k 代表 messages 只能存 120 個(gè) msg當(dāng) 7649 秒從 messages 刪除丫4 之後,y4 還存在於 activerouter 的 outgoing messag

11、es 內(nèi) 因爲(wèi)在 update 時(shí) trymessagesforconnected 從頭到尾都使用 outgoing messages 取 m 跟 con,並不會發(fā)現(xiàn)messages中已經(jīng)刪除丫4 了k到transferdone時(shí):去messages找丫4,已經(jīng)早就被刪除了,而造成null（詳細(xì)說明可參考20140310投影片）解決方法:decisionenginerouter （上圖）修改前（卜圖）修改後在trymessagesforconnected前先檢査messages內(nèi)的msg布不在，則a避免nullpointer問題overrideupdate®public voidsu

12、per.update();if (!canstarttransfer() | istransferring() return; / nothing to transfer or is currently transferringfor(iterator<tuple<messagej connectioni = outgoingmessages.iterator); i.hasnext();)tuple<message> connection t = i.next(); if(!this.hasmessage(tgetkey()getld()i.remove();trym

13、essagesforconnected(outgoingmessages);overridepublic voidsuper.update();if (!canstarttransfer() | istransferring() return; / nothing to transfer or is currently transferringtrymessagesforconnected(outgoingmessages);for(iterator<tuple<message> connection” i - outgoingmessages.iterator(); i.h

14、asnext();)tuple<message> connection) t i.next(); if(!thishasmessage(t.getkey()getld()i.rer»ove();3. 不管ttl多少，跑出來的cost和delivery ratio都一樣0.9noo!lej ajaapp0.40.3 n o2minttl解決方法：在 decisionenginerouter 的 createnewmessage 中加入 m.setttl(this.msgttl);problems 卬 javadoc 也 deckrabon console

15、k<terminated> dtnsim(bubblerap mix draft) java application c:program filesjavacan't start: error in configuration file(s)can1t find setting decisionenginerouter-decisionengine1解決方法:run configuration 的 arguments 要加入 bubble.txt©run configurationscreate, manage, and run configurationsrun

16、 a java applicationrunclose將以下幾個(gè)資料夾和檔案放到j(luò)avaproject/src資料夾，就可以用run.bat去執(zhí)行compiler跟one執(zhí)行小 黑窗版，然後用eclipse瀏覽code,但a*能小黑窗compiler過，改變了 classpath之類的，就會導(dǎo)致eclipse 無法跑這份程式了,只能用eclipse瀏覽code,還算方便(按住ctrl移到object或method上可以自動進(jìn)入 該 class)結(jié)論:用小黑窗跑程式，用eclipse看code workspace 2014.03one_simulator(bubblerap mix draft)

17、 src applications2014/3/11 下午 1.唱葵資料xbubblera p_ttl_test2014/3/11 下午 1.唱竇資料滅core2014/3/11 下午 1.唱葵資料xdata2014/3/11 下午 0.doc2014/3/11 下午 0.唱案資料滅ee2014/3/11 下午()唱案資料夾gui2014/3/11 下午 1.唱案資料滅input2014/3/11 下午 1.interfaces2014/3/11 下午 1.唱案資料滅i lib2014/3/11 下午 1 唱案資料夾movement2014/3/11 下午 1.唱案資料滅report2014/3/11 下午 1.reports2014/3/11 下午 0.唱葵資料xrouting2014/3/11 下午 1.唱竇資料滅test2014/3/11 下午 0.唱葵資料xtoolkit2014/