P2Pを用いた携帯用コンテンツサービスシステムの一方式
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(2) ࠷ࠍឭଏߔࠆ㨃㨑㨎ࠨࠗ࠻ߦࠕࠢࠬߒ㧘ߘߎ߆ ࠄ࠳࠙ࡦࡠ࠼ߔࠆߣ߁ᣇᴺ߇৻⥸⊛ߢࠅ㧘. ࠢࠗࠕࡦ࠻(៤Ꮺ㔚). GC ⓨ㑆 ⷫࡇࠕ ࡔ࡞ࠨࡃ B. ߘߩ㓙ߦᏗᦸߩࠦࡦ࠹ࡦ࠷ࠍᓧࠆ߹ߢ㨃㨑㨎ࠨ ࠗ࠻ࠍᰴߣޘᬌ⚝ߒߡ࠳࠙ࡦࡠ࠼ߔࠆߣ߁ ߿ࠅᣇߢߪ㧘ធ⛯ᤨ㑆߇㐳ߊߥߞߡߒ߹߁㧚৻ᣇ㧘 㧼㧯ߩੱ߳ߩ᥉ߪ⋡ߑ߹ߒ߽ߩ߇ࠅ㧘៤ Ꮺ↪ߩࠦࡦ࠹ࡦ࠷ࠍ᳇シߦᚑߒ㧘ߘࠇࠍ⊒ߒ. ࠨࡃㇱ Web ࠨࡃ ࡔ࡞ࠨࡃ A. ߚࠅઁੱߦឭଏߒߚߣ߁᰼᳞߽ẜ⊛ߦߪ. ሶࡇࠕ. ᄙߩߢߪߥ߆ߣᕁࠊࠇࠆ㧚৻⥸ߩ㧼㧯ᚲ⠪ ߢ⥄ಽ߇ᚑߒߚຠ㧔ࠦࡦ࠹ࡦ࠷㧕ࠍ㧘߃ߡ. ࿑㧝 ᭴ᚑ࿑ⷐ. ⸒߁ߥࠄ߫㧘ᣣᦐᣣߩߩࠡࡖߩࠃ߁ߥ ႐ᚲߢ᳇シߦ⊒ߒ㧘ߘߩᔕࠍߡߺߚߣ⠨ ߃ߡࠆੱ߇ࠆߩߢߪߥ߆ߣ⠨߃ࠄࠇࠆ㧚ߎ. ߣ ߫ ࠇ ࠆ Peer ߩ 㓸 ว ࠍ ᒻ ᚑ ߒ ߡ ߅ ࠅ 㧘. ࠇ߆ࠄߪ㧘༡⋡⊛ߩ↪ߩࠨࠗ࠻ߣߦ㧘৻⥸. PeerGroup ౝߢ㧘JXTA ࡀ࠶࠻ࡢࠢߦሽ. ߩ࡙ࠩ߇ࠦࡦ࠹ࡦ࠷ߩ⠪ߣߒߡᚻシߦ⊒. ߔࠆઁߩ Peer ࠍ⥄⊒⊛ߦ⊒ߔࠆߎߣ߇ߢ߈ࠆ㧚. ߒᵹㅢߢ߈ࠆ႐߇ᔅⷐߢ㧘ᣂߒࠦࡦ࠹ࡦ࠷ߩ. Peer ߪ Advertisement ߣ߫ࠇࠆ XML ࠼ࠠࡘ. ᵹㅢࠨࡆࠬߩᒻᘒࠍ⠨߃ߡߊᔅⷐ߇ࠆ߽. ࡔࡦ࠻ࠍ↪ߡ㧘ࠨࡆࠬࠍ๔⍮ߔࠆ㧚߹ߚ㧘. ߩߣ⠨߃ࠄࠇࠆ㧚. Peer ห჻ߪߦᗐㅢା࠴ࡖࡀ࡞ߢࠆ Pipe. ߘߎߢᧄ⎇ⓥߢߪ㧘P2P㧔Peer-to-Peer㧕[1-5]. ࠍ↪ߡ Message ࠍㅍฃାߔࠆ㧚. ߩࡊ࠶࠻ࡎࡓߣߒߡᲧセ⊛᥉ߒߡࠆ. JXTA ߦߪ XML ࡔ࠶ࠫࠍࡌࠬߣߒߚᰴ. JXTA[5-8]ࠍ↪ߡ㧘㧼㧯ᚲ⠪߇ᚑߒߚ៤Ꮺ. ߩ㧢ߟߩࡊࡠ࠻ࠦ࡞߇↪ᗧߐࠇߡ߅ࠅ㧘ߎࠇࠄࠍ. ↪ࠦࡦ࠹ࡦ࠷ࠍ៤Ꮺ㔚ߩᚲ⠪ߦᚻシߦឭଏ. ᔕ↪ߒߡࠕࡊࠤ࡚ࠪࡦࠍᚑߒߡⴕߊ㧚. ߢ߈ࠆࠃ߁ߥࠨࡆࠬࠪࠬ࠹ࡓߩ৻ᣇᑼࠍឭ᩺. 㧔㧝㧕Peer Discovery Protocol(PDP)㧦ઁߩ Peer. ߔࠆ㧚ᧄᣇᑼߢߩࠨࡆࠬߣߒߡߪ㧘ᓙߜฃߌ. ߳ߩ Advertisement ߩⷐ᳞ߣᔕ╵ࠍⴕ߁㧚. ↹ࠍត⚝㓸ߔࠆࠨࡆࠬࠪࠬ࠹ࡓߦߟߡ. 㧔㧞㧕Peer Information Protocol(PIP)㧦ઁߩ Peer. ขࠅߍ㧘⹜㛎⊛ߦ㐿⊒߽ⴕߞߚ㧚. ߩ⁁ᘒߦ㑐ߔࠆᖱႎ㧔Ⓙᤨ㑆㧘⁁ᘒ㧘࠻ࡈࠖ ࠶ࠢ╬㧕ࠍขᓧߔࠆ㧚. 㧞㧚JXTA ߦߟߡ. 㧔㧟㧕Peer Resolver Protocol(PRP)㧦Peer 㑆ߢ. JXTA[5-8]ߪ P2P ࡊ࠶࠻ࡎࡓߣߒߡ Sun. ࡔ࠶ࠫߩㅍฃାࠍⴕ߁㧚. Microsystems ߇ឭ໒ߒߚ߽ߩߢ㧘ࠝࡊࡦ࠰. 㧔㧠㧕Pipe Binding Protocol(PBP)㧦Peer ߩࠛ. ࠬߢࠆ㧚 JXTA ߢേߊࠕࡊࠤ࡚ࠪࡦߦ. ࡦ࠼ࡐࠗࡦ࠻ߦ Pipe ࠍࡃࠗࡦ࠼ߔࠆ㧚. ߟߡߪ㧘ߊߟ߆ߩ㐿⊒ࡊࡠࠫࠚࠢ࠻߇ሽߒ. 㧔㧡㧕Endpoint Routing Protocol(ERP)㧦Peer. ߡࠆ㧚. ߇ઁߩ Peer ߩ⋡⊛ߩࠛࡦ࠼ࡐࠗࡦ࠻߹ߢߩ࡞. JXTA ࡀ࠶࠻ࡢࠢߪ Peer ߣ߫ࠇࠆ࠺ࡃࠗ. ࠻ࠍߟߌࠆ㧚. ࠬ߆ࠄ᭴ᚑߐࠇߡࠆ㧚ฦ Peer ߪઁߩ Peer ߣ. 㧔㧢㧕Peer Rendezvous Protocol(RVP)㧦Peer. ߪ⁛┙㕖หᦼߦേߔࠆ߽ߩߢ㧘Peer ߪ Peer. ߇ Peer Group ౝߦ Message ࠍવߔࠆߚߦ. ID ߦࠃࠅ৻ᗧߦ⼂ߐࠇࠆ㧚Peer ߪ Peer Group. ↪ߔࠆ㧚. −34− 2.
(3) 㧟㧚ࠪࠬ࠹ࡓ᭴ᚑߣᯏ⢻. ࡓߢߪⷫࡇࠕߣሶࡇࠕߩ㑆ߢ㧘ᓙߜฃߌ↹ߩࡈ. ᧄࠪࠬ࠹ࡓߩ᭴ᚑߣᯏ⢻ࠍᰴߦ␜ߔ㧚ᧄࠪࠬ࠹. ࠔࠗ࡞ߦ㑐ߔࠆᖱႎߩ߿ࠅขࠅ߿ࡈࠔࠗ࡞ㅍฃ. ࡓߪᄢ߈ߊಽߌࠆߣࠢࠗࠕࡦ࠻(៤Ꮺ㔚)㧘ࠨ. ାߩ࠲ࠗࡒࡦࠣࠍ⸘ࠆ㓙ߦ Message ߩㅍฃାߩ. ࡃ㧘ࠣ࠶࠼ࠦࡦࡇࡘ࠹ࠖࡦࠣⓨ㑆(એਅ㧘. ߚߦ㧘JxtaPropagate Pipe ߣ⸒߁หߓ Pipe. GC ⓨ㑆)ߩ㧟ߟߩㇱಽ߆ࠄᚑࠆ㧔࿑㧝ෳᾖ㧕㧚. Advertisement ࠍߒߡࠆోߡߩࡇࠕߦ৻ᢧ. ࠨࡃㇱߪ㧘Web ࠨࡃߣࡔ࡞ࠨࡃ(એਅ㧘. ߦ Message ࠍㅍାߔࠆߎߣ߇ߢ߈ࠆ Pipe ࠍ↪. ࡔ࡞ࠨࡃ A)ߩ㧞ߟ߆ࠄߥࠅ㧘៤Ꮺ㔚߆ࠄ. ߒߡࠆ㧚ᦝߦ㧘ⷫࡇࠕߣሶࡇࠕ㑆ߢᓙߜฃߌ↹. ࡙ࠩ߇Ꮧᦸߔࠆᓙߜฃߌ↹ߩࠞ࠹ࠧ߇ࠨ. ߩࡈࠔࠗ࡞ࠍㅍฃାߔࠆߚߦ JxtaSocket ࠍ. ࡃߦㅍࠄࠇࠆߣ㧘ࠨࡃㇱߪ㧳㧯ⓨ㑆ߦሽߔ. ↪ ߒ ߡ ࠆ 㧚 JxtaSocket ߢ ߪ 㧘 JXTA. ࠆᓙߜฃߌ↹ߩឭଏࠍᏗᦸߔࠆੱߩ㧼㧯ߟ. Uni-dircetionalPipe ࠍ↪ߒ㧘J2SE ߢ⸒߁ Socket. ߹ࠅሶࡇࠕߦኻߒߡ㧘ⷫࡇࠕ⚻↱ߢⷐ᳞ࠍㅍࠅ㧘. ߦᒰߚࠆᯏ⢻ࠍታߒߡࠆ㧚JxtaSocket ߪ㧝ኻ. ߘߩᔕ╵ߣߒߡሶࡇࠕ߆ࠄᚯߞߡ᧪ߚ↹ࠍ៤. 㧝ߩㅢାߩߚߩ߽ߩߢࠅ㧘ᧄࠪࠬ࠹ࡓߢߪ. Ꮺ㔚࡙ࠩߦ㑛ⷩߐߖ㧘Ꮧᦸߦᔕߓߡ࠳࠙ࡦࡠ. JxtaMulticastSocket ࠍ↪ߒߡࠆ㧚. ࠼ߔࠆߣ߁߈ࠍߔࠆ㧚. JxtaMulticastSocket ߪ㧘ઁߩ Muliticast ࡎࠬ࠻߇ሽ. GC ⓨ㑆ߪฦ⒳ᓙߜฃߌ↹ࠍߔࠆሶࡇ. ߔࠆࠣ࡞ࡊߦធ⛯ߔࠆᯏ⢻ࠍട߃ߚ࠺࠲. ࠕ㧘ⶄᢙߩሶࡇࠕࠍ⛔▤ℂߒࠨࡃㇱߣߩ߿. ࠣࡓ࠰ࠤ࠶࠻ߢࠅ㧘ߎࠇࠍ↪ࠆߎߣߢ㧘ห. ࠅขࠅࠍಣℂߔࠆⷫࡇࠕ㧘߅ࠃ߮ࡔ࡞ࠨࡃ. ߓ Pipe Advertisement ࠍߒߡࠆ㧝ߟߩⷫࡇࠕ. (એਅ㧘ࡔ࡞ࠨࡃ B)ߩ㧟ߟ߆ࠄ᭴ᚑߐࠇࠆ㧚. ߣⶄᢙߩሶࡇࠕ㑆ߢߩࡈࠔࠗ࡞ߩㅍฃା߇น⢻. ᧄࠪࠬ࠹ࡓߩ GC ⓨ㑆ߦ߅ߡߪ㧘ⷫࡇࠕߪᏱߦ. ߣߥߞߡࠆ㧚. ሽߔࠆ߽ߩߣߔࠆ㧚ߒ߆ߒߥ߇ࠄሶࡇࠕߪੱ ߩ㧼㧯ߢࠅ㧘ߎߩⓨ㑆ߢߩࠅߪ⥄↱ߣߔࠆ㧚. 㧟㧚㧞㧚ฦㇱಽߩᯏ⢻ ࠢࠗࠕࡦ࠻㧘ࠨࡃㇱ߅ࠃ߮ GC ⓨ㑆㧔ⷫࡇ. ߥ߅㧘ሶࡇࠕ߇ฦ⒳ᓙߜฃߌ↹ࠍߒߡ߅ߊ ࠺ࠖࠢ࠻ߪ੍ቯࠄࠇߚ㗔ၞߦ㒢ቯߒߡ. ࠕߣሶࡇࠕ㧕ߩฦᯏ⢻ߦߟߡએਅߦ␜ߔ㧚. ߅ߊ㧚. ࠢࠗࠕࡦ࠻㧔៤Ꮺ㔚㧕ߢߪᰴߩߎߣࠍⴕ߁㧚. ߥ ߅㧘 ᧄ㐿 ⊒ߩ 㐿⊒ ⅣႺ ߣߒ ߡ ߪ. 㧔㧝㧕↪น⢻ߥᓙߜฃߌ↹ࠞ࠹ࠧߩౝ㧘ข. J2SDK1.4.2_05㧘JXTAv2.3.4b ߅ࠃ߮ Tomcat5.0. ᓧߒߚᓙߜฃߌ↹ߩࠞ࠹ࠧฬࠍ㗴ฬߣߔ. ࠍ↪ߒߚ㧚. ࠆⓨࡔ࡞ߩㅍା 㧔㧞㧕GC ⓨ㑆ߢ㓸ߐࠇ㧘ࠨࡃㇱ߳ߣᷰߐࠇ. 㧟㧚㧝㧚ᧄࠪࠬ࠹ࡓߢߩ JXTA. ߚᓙߜฃߌ↹ࠍෳᾖߔࠆߚ㧘ត⚝㓸ಣℂ. ᧄࠪࠬ࠹ࡓߩᯏ⢻ߢࡐࠗࡦ࠻ߣߥࠆߩߪ㧘GC. ⚳ੌᓟ㧘ࠨࡃㇱ߆ࠄㅢ⍮ߐࠇࠆ URL ߳ߩࠕࠢ. ⓨ㑆ߦ߅ߌࠆⷫࡇࠕ߆ࠄሶࡇࠕ߳ߩᓙߜฃߌ↹. ࠬ. ߩⷐ᳞ߩ㓙ߩត⚝ߣ㧘ߘߩᔕ╵ߦၮߠߊᓙߜฃ. ߥ߅㧘ࠢࠗࠕࡦ࠻ߢߪ․ߥࠕࡊࠤࠪ. ߌ↹ߩ㓸ߢࠅ㧘ߘߩ㓙ߩ JXTA ߩ↪ᣇᴺ. ࡚ࡦࠍ߁ᔅⷐߪߥߊᓥ᧪៤Ꮺ㔚ߦタߐࠇ. ߦߟߡએਅߦㅀߴࠆ㧚. ߡࠆᯏ⢻ߛߌࠍ↪ࠆ㧚. ᧄ ࠪ ࠬ ࠹ ࡓ ߢ ߪ. Pipe. ߅ ࠃ ߮. ࠨࡃㇱߢߪᰴߩߎߣࠍⴕ߁㧚. JxtaMulticastSocket ࠍᚑߔࠆߦߚߞߡ㧘. 㧔㧝㧕ࡔ࡞ࠨࡃ A ߦࠢࠗࠕࡦ࠻߮ GC. Advertisement ࠍ↪ߒߡࠆ㧚߹ߚ㧘ᧄࠪࠬ࠹. ⓨ㑆߆ࠄߩᣂ⌕ࡔ࡞߇᧪ߡߥ߆ߩቯᦼ⊛. −35− 3.
(4) ࠴ࠚ࠶ࠢ. 㧔㧢㧕ID ࠍ㗴ฬߣߒ㧘ሶࡇࠕࠄ߆ࠄขᓧߒߚᓙ. Ԙ ࠢࠗࠕࡦ࠻߆ࠄㅍାߐࠇߡ߈ߚࡔ࡞. ߜฃߌ↹ߩࡈࠔࠗ࡞ࠍᷝઃߒߚࡔ࡞ߩࠨ. ࠍฃାߒߚ႐ว㧦ࠢࠗࠕࡦ࠻ߩࡔ࡞ࠕ࠼. ࡃㇱ߳ߩㅍା㧘ᦝߦࡈࠜ࡞࠳ߣᓙߜฃߌ↹ߩࡈ. ࠬ㧘㗴ฬߩ߅ࠃ߮ሽ. ࠔࠗ࡞ߩ㒰. ԙ GC ⓨ㑆߆ࠄㅍାߐࠇߡ߈ߚࡔ࡞ߩฃ. ሶࡇࠕߢߪએਅߩߎߣࠍⴕ߁㧚. ାߒߚ႐ว㧦ߤߩࠢࠗࠕࡦ࠻ߦኻߔࠆត. 㧔㧝㧕GC ⓨ㑆߳ߩࡠࠣࠗࡦ㧦ෳടߒߚߎߣࠍⷫ. ⚝㓸ᬺߩ⚿ᨐߢࠆ߆ࠍ␜ߔ ID ࠍ㗴. ࡇࠕߦ Pipe ࠍ↪ߡㅢ⍮. ฬ߆ࠄߒ㧘ᷝઃߐࠇߡ߈ߚᓙߜฃߌ↹. 㧔㧞㧕ⷫࡇࠕ߆ࠄ Pipe ࠍㅢߓߡવ߃ࠄࠇߚ ID. ࠍ ID Ფߦಽߌߡሽ. ࠍၮߦត⚝⚿ᨐࠍሽߒߡ߅ߊߚߩࡈࠜ࡞࠳. 㧔㧞㧕ࠪࠬ࠹ࡓౝߢߩฦࠢࠗࠕࡦ࠻ߩ⼂߅ࠃ. ࠍᚑ. ߮ฦࠢࠗࠕࡦ࠻߇ត⚝㓸ᬺߩ⚿ᨐࠍෳᾖ. 㧔㧟㧕ID ߣߦⷫࡇࠕ߆ࠄવ߃ࠄࠇߚࠞ࠹ࠧ. ߔࠆ㓙ߦᔅⷐߣߥࠆ ID ߩ↢ᚑ㧘ᦝߦ ID ߣࡔ. ฬࠍၮߦ࠺ࠖࠢ࠻ࠍត⚝ߒ㧘ߘߩਛ߆ࠄࡦ. ࡞ࠕ࠼ࠬߣߩኻᔕઃߌ. ࠳ࡓߦ㧝ߟߩᓙߜฃߌ↹ߩࡈࠔࠗ࡞ࠍㆬ߮. 㧔㧟㧕ID Ფߦត⚝㓸ᬺߩ⚿ᨐࠍሽߒߡ. ߒ㧘ࡈࠜ࡞࠳ߦࠦࡇ. ߅ߊߚߩࡈࠜ࡞࠳(ࡈࠜ࡞࠳ฬ㧦ID)ߩᚑ. 㧔㧠㧕Pipe ࠍ↪ߡ㧘ID Ფߦㅍାߔࠆᓙߜฃߌ. 㧔㧠㧕GC ⓨ㑆߳ߩᓙߜฃߌ↹ߩត⚝㓸. ↹ߩࡈࠔࠗ࡞ߦ㑐ߔࠆᖱႎ(ࡈࠔࠗ࡞ฬ㧘ࠨࠗ. ᬺߩଐ㗬㧦ត⚝㓸ߒߡ᰼ߒᓙߜฃߌ↹ߩ. ࠭)ࠍⷫࡇࠕߦㅢ⍮. ࠞ࠹ࠧฬ߅ࠃ߮ߤߩࠢࠗࠕࡦ࠻߆ࠄߩଐ㗬. 㧔㧡㧕JxtaMulticastSocket ࠍ↪ߡ㧘ID Ფߦ. ߆ࠍ␜ߔ ID ࠍ㗴ฬߣߔࠆⓨࡔ࡞ߩㅍା. ࡈࠜ࡞࠳ߩਛߦࠆᓙߜฃߌ↹ߩࡈࠔࠗ࡞ߩ. 㧔㧡㧕ࠢࠗࠕࡦ࠻߳ᓙߜฃߌ↹ߩត⚝㓸. ⷫࡇࠕ߳ߩㅍା㧘ᦝߦࡈࠜ࡞࠳ߣᓙߜฃߌ↹ߩ. ᬺߩ⚳ੌ߅ࠃ߮⚿ᨐෳᾖߩߚߩ ID ࠍㅢ⍮ߔ. ࡈࠔࠗ࡞ߩ㒰. ࠆࡔ࡞ߩㅍା ⷫࡇࠕߢߪએਅߩߎߣࠍⴕ߁㧚. 㧠㧚ࠪࠬ࠹ࡓߩಣℂᚻ㗅. 㧔㧝㧕ࡔ࡞ࠨࡃ B ߦࠨࡃㇱ߆ࠄߩᣂ⌕ࡔ. ᧄࠪࠬ࠹ࡓߦ߅ߌࠆಣℂߩᚻ㗅ࠍએਅߦ␜ߔ. ࡞߇᧪ߡߥ߆ߩቯᦼ⊛࠴ࠚ࠶ࠢ. 㧔࿑㧞ෳᾖ㧕 㧚. 㧔㧞㧕ࠨࡃㇱ߆ࠄㅍାߐࠇߡ߈ߚࡔ࡞ߩಣ. ߹ߕ㧘Ḱߣߒߡࠨࡃㇱߩ Web ࠨࡃ߇ࡔ. ℂ㧦ត⚝㓸ߒߡ᰼ߒᓙߜฃߌ↹ߩࠞ࠹ࠧ. ࡞ࠨࡃ A ߳ߩᣂ⌕ࡔ࡞ࠍ㧘GC ⓨ㑆ߦ߅ߌࠆ. ฬ߅ࠃ߮ߤߩࠢࠗࠕࡦ࠻߆ࠄߩଐ㗬߆ࠍ␜. ⷫࡇࠕ߇ࡔ࡞ࠨࡃ B ߳ߩᣂ⌕ࡔ࡞ࠍฦޘ. ߔ ID ࠍ㗴ฬ߆ࠄ. ቯᦼ⊛ߦ࠴ࠚ࠶ࠢߒߡࠆ⁁ᘒߦߒߡ߅ߊ㧚. 㧔㧟㧕ID Ფߦត⚝㓸ߒߚ⚿ᨐࠍሽߒߡ߅. Ԙ ขᓧߒߚᓙߜฃߌ↹ߩࠞ࠹ࠧฬࠍ㗴. ߊߚߩࡈࠜ࡞࠳(ࡈࠜ࡞࠳ฬ㧦ID)ߩᚑ 㧔㧠㧕ሶࡇࠕߦኻߒ Pipe ࠍ↪ߡߒߚࠞ࠹. ฬߣߔࠆࡔ࡞ࠍㅍା ԙ Web ࠨࡃ߇ࡔ࡞ࠨࡃ㧭ߩᣂ⌕ࡔ࡞. ࠧฬߣ ID ࠍㅍାߒ㧘ᓙߜฃߌ↹ߩត⚝ࠍଐ. ࠍᬌ. 㗬. Ԛ ᣂ⌕ࡔ࡞ߩฃା. 㧔㧡㧕JxtaMulticastSocket ࠍ↪ߡ㧘ID Ფߦ. ԛ ฃାߒߚࡔ࡞߆ࠄࠢࠗࠕࡦ࠻ߩࡔ࡞. ሶࡇࠕࠄ߆ࠄߩᓙߜฃߌ↹ߩࡈࠔࠗ࡞ࠍฃା. ࠕ࠼ࠬ㧘㗴ฬ(ࠞ࠹ࠧฬ)ࠍሽ. ߒ㧘ࡈࠜ࡞࠳ߦሽ. −36− 4.
(5) Ԟ GC ⓨ㑆߳ߩᓙߜฃߌ↹ߩត⚝㓸ᬺ. Ԙࡔ࡞ㅍା ࠢࠗࠕࡦ࠻. ߩଐ㗬(ត⚝㓸ߒߡ᰼ߒᓙߜฃߌ↹. ԩត⚝㓸⚳ੌߩㅢ⍮ ԫ. ߩࠞ࠹ࠧฬ߅ࠃ߮ߤߩࠢࠗࠕࡦ࠻߆ࠄ. ߦว䏉ߚត⚝㓸⚿ᨐߩ␜ ID. ߩଐ㗬߆ࠍ␜ߔ ID ࠍ㗴ฬߣߔࠆⓨࡔ࡞ߩ. Ԫࡈࠜࡓ߆ࠄ ID ㅍା. ㅍା). ԙᣂ⌕ࡔ࡞࠴ࠚ࠶ࠢ (ቯᦼ⊛). ԟ ⷫࡇࠕ߇ࡔ࡞ࠨࡃ B ߩᣂ⌕ࡔ࡞ࠍᬌ. ࡔ࡞ࠨࡃ A. Ԛฃା. Ԡ ᣂ⌕ࡔ࡞ߩฃା ԡ ฃାߒߚࡔ࡞߆ࠄ㗴ฬ(ត⚝㓸ߒߡ᰼. ԛࠢࠗࠕࡦ࠻߆ࠄߩࡔ࡞ಣℂ(ࡔ ࡞ࠕ࠼ࠬ㧘㗴ฬߩ߮ሽ). ߒᓙߜฃߌ↹ߩࠞ࠹ࠧฬ߮ߤߩࠢ. ԜID ↢ᚑ㧘ࡔ࡞ࠕ࠼ࠬߣߩኻᔕઃߌ. ࠗࠕࡦ࠻߆ࠄߩଐ㗬߆ࠍ␜ߔ ID)ࠍ. ԝࡈࠜ࡞࠳(ࡈࠜ࡞࠳ฬ:ID)ߩ↢ᚑ. ሽ Ԣ ID Ფߦត⚝㓸ᬺߩ⚿ᨐࠍሽߒߡ߅. Web ࠨࡃ. ߊߚߩࡈࠜ࡞࠳(ࡈࠜ࡞࠳ฬ㧦ԡߢߒ. Ԩត⚝㓸⚿ᨐߩㅍା Ԟត⚝㓸ߩଐ㗬. ߚ ID)ࠍᚑ. ԟᣂ⌕ࡔ࡞࠴ࠚ࠶ࠢ(ቯᦼ⊛). ԣ ሶࡇࠕࠄߦኻߒ Pipe ࠍ↪ߡԡߢߒߚ ࠞ࠹ࠧฬߣ ID ࠍㅍାߒ㧘ᓙߜฃߌ↹ߩ. Ԡฃା ࡔ࡞ࠨࡃ B. ត⚝ࠍଐ㗬. ⷫࡇࠕ ԡWeb ࠨࡃ߆ࠄߩࡔ࡞ಣℂ(㗴ฬ߆. Ԥ ԣߢᓧߚ ID ࠍၮߦត⚝⚿ᨐࠍሽߒߡ߅ߊ. ࠄ ID ߣࠞ࠹ࠧฬߩ߮ሽ). ߚߩࡈࠜ࡞࠳(ࡈࠜ࡞࠳ฬ㧦ID)ࠍᚑ. Ԣࡈࠜ࡞࠳(ࡈࠜ࡞࠳ฬ:ID)ߩ↢ᚑ. ԥ ԣߢᓧߚࠞ࠹ࠧฬࠍၮߦ࠺ࠖࠢ࠻ࠍ. ԣID ߣࠞ࠹ࠧฬߩㅍା. ត⚝㧘ߘߩਛ߆ࠄࡦ࠳ࡓߦ㧝ߟߩᓙߜฃߌ. Ԧࡈࠔࠗ࡞ߦ㑐ߔࠆᖱႎߩㅍା. ↹ߩࡈࠔࠗ࡞ࠍㆬ߮ߒ㧘Ԥߢᚑߒߚࡈ. ԧࡈࠔࠗ࡞ߩㅍା. ࠜ࡞࠳ߦࠦࡇ Ԧ Pipe ࠍ↪ߡ㧘ID Ფߦԥߢㆬᛯߒߚᓙߜฃ. Ԥࡈࠜ࡞࠳(ࡈࠜ࡞࠳ฬ:ID)ߩᚑ ሶࡇࠕ ԥࠞ࠹ࠧฬࠍၮߦ࠺ࠖࠢ࠻ត⚝ߒ. ߌ↹ߩࡈࠔࠗ࡞ߦ㑐ߔࠆᖱႎ(ࡈࠔࠗ࡞ฬ. ࡈࠔࠗ࡞ࠍ㧝ߟㆬࠎߢࡈࠜ࡞࠳ߦᩰ⚊. ߮ࡈࠔࠗ࡞ࠨࠗ࠭)ࠍⷫࡇࠕߦㅢ⍮ ԧ JxtaMulticastSocket ࠍ↪ߡ㧘ID ᲤߦԤ. ࿑㧞 ಣℂᚻ㗅. ߢᚑߒߚࡈࠜ࡞࠳ߩਛߦࠆᓙߜฃߌ↹ ߩࡈࠔࠗ࡞ࠍⷫࡇࠕߦㅍା㧘ᦝߦࡈࠜ࡞࠳. Ԝ ࠪࠬ࠹ࡓౝߢߩࠢࠗࠕࡦ࠻ߩ⼂㧘߹ߚ㧘. ߣᓙߜฃߌ↹ߩࡈࠔࠗ࡞ࠍ㒰. ࠢࠗࠕࡦ࠻߇ត⚝㓸ᬺߩ⚿ᨐࠍෳᾖ. Ԩ ID ࠍ㗴ฬߣߒ㧘ԧߢሶࡇࠕࠄ߆ࠄขᓧߒߚ. ߔࠆ㓙ߦᔅⷐߣߥࠆ ID ߩ↢ᚑ㧘ߘߩᓟ㧘ᓟ ߦࠢࠗࠕࡦ࠻߳⚳ੌㅢ⍮ࠍㅍାߔࠆߚ㧘. ᓙߜฃߌ↹ߩࡈࠔࠗ࡞ࠍᷝઃߒߚࡔ࡞. ࡔ࡞ࠕ࠼ࠬߣኻᔕઃߌ. ࠍࡔ࡞ࠨࡃ㧭߳ㅍା㧘ᦝߦࡈࠜ࡞࠳ߣᓙ. ԝ ID Ფߦត⚝㓸ᬺߩ⚿ᨐࠍሽߒߡ߅ ߊߚߩࡈࠜ࡞࠳(ࡈࠜ࡞࠳ฬ㧦Ԝߢᚑߒ. ߜฃߌ↹ߩࡈࠔࠗ࡞ࠍ㒰 ԩ Ԩߩࡔ࡞ࠍฃାᓟ㧘ߤߩࠢࠗࠕࡦ࠻ߦኻ. ߚ ID)ࠍᚑ. ߔࠆត⚝㓸ᬺߩ⚿ᨐߢࠆ߆ࠍ␜ߔ. −37− 5.
(6) ID ࠍ㗴ฬ߆ࠄߒ㧘ᷝઃߐࠇߡ߈ߚᓙߜ ฃߌ↹ࠍԝߢᚑߒߚࡈࠜ࡞࠳ߦሽ㧘ߘ 䊌䉬䉾䊃㊂. ߩᓟ㧘ࠢࠗࠕࡦ࠻ߦត⚝㓸⚿ᨐࠍෳᾖ ߔࠆߚߩ URL ߣԜߢᚑߒߚ ID ࠍㅢ⍮ ߔࠆࡔ࡞ࠍㅍା. 㪡㪯㪤㪜ᣇᑼ ᧄᣇᑼ. 㪈 㪈㪇 㪌㪇 㪈㪇㪇 㪈㪌㪇 㪉㪇㪇 㪉㪌㪇 㪊㪇㪇 㪊㪌㪇 㪋㪇㪇 㪋㪌㪇 㪌㪇㪇. Ԫ ࠢࠗࠕࡦ࠻ߪԩߩࡔ࡞ࠍฃାᓟ㧘ᜰቯߐ. 㪋㪌㪇㪇㪇 㪋㪇㪇㪇㪇 㪊㪌㪇㪇㪇 㪊㪇㪇㪇㪇 㪉㪌㪇㪇㪇 㪉㪇㪇㪇㪇 㪈㪌㪇㪇㪇 㪈㪇㪇㪇㪇 㪌㪇㪇㪇 㪇. ࠇߚ URL ߦࠕࠢࠬߒ㧘ࡈࠜࡓߦ ID ࠍ. 䊏䉝ᢙ. ജߒߡࡠࠣࠗࡦ ԫ Web ࠨࡃߪㅍାߐࠇߡ߈ߚ ID ߣหߓฬ. ࿑㧟 ࡇࠕᢙࡄࠤ࠶࠻㊂. ೨ߩࡈࠜ࡞࠳߇ࠆ߆ุ߆ࠍ࠴ࠚ࠶ࠢߒ㧘 ࠇ߫ߘߩࡈࠜ࡞࠳ౝߦࠆᓙߜฃߌ↹ߩ. ߒߡࠆߚ㧘JXME ᣇᑼߦߪᔅⷐߥ㧘ᓙߜฃ. ࡈࠔࠗ࡞ߩ৻ⷩࠍ␜ߒ㧘ߥߌࠇ߫ࠛ↹. ߌ↹ߩࡈࠔࠗ࡞ߩ႐ᚲߢࠆࡇࠕߩᚲ. 㕙ࠍ⚿ᨐߣߒߡࠢࠗࠕࡦ࠻߳ାߔࠆ㧚ࠢ. ߩวࠊߖߣត⚝ߩࠬ࠹࠶ࡊࠍ⋭⇛ߔࠆߎ. ࠗࠕࡦ࠻ߪ᳇ߦߞߚᓙߜฃߌ↹ࠍ࠳. ߣ߇ߢ߈ࠆߣ߁ߎߣ߇ߍࠄࠇࠆ㧚. ࠙ࡦࡠ࠼㧚ߘߩᓟ㧘ࡠࠣࠕ࠙࠻㧚. ᰴߦ㧘ਔᣇᑼߢߩࡄࠤ࠶࠻㊂ߩᲧセࠍⴕ߁ߎߣ ߦߔࠆ㧚Ყセࠍⴕ߁ߦߚߞߡ㧘߹ߕਔᣇᑼߣ߽㧘. 㧡㧚⹏ଔ. ࠢࠗࠕࡦ࠻ߪ㧔ᤨὐߢߩෳടࡇࠕᢙ㧕0.5. ࿁㧘ᧄࠪࠬ࠹ࡓߩ⹏ଔߣߒߡ㧘៤Ꮺ┵ᧃ↪ߩ. ࿁⋡ߩ↹ត⚝ߦ߅ߡ᰼ߒ↹ࠍߟߌࠆ. JXTA ߢࠆ JXME㧔 ᱜᑼฬ㧘JXTA for J2ME㧕. ߎߣ߇ߢ߈ࠆ߽ߩߣߔࠆ㧚߹ߚ㧘ᧄᣇᑼߢߪ㧘㧝. [9-11]ࠍ↪ߡห╬ߩࠨࡆࠬࠍታߒߚ႐ว. ࡄࠤ࠶࠻ߩࠨࠗ࠭ߪ 128 ࡃࠗ࠻㧘࠳࠙ࡦࡠ࠼. ߣࡄࠤ࠶࠻㊂ߩᲧセࠍⴕ߁ߎߣߦߒߚ㧚JXME. น⢻ߥ↹ࡈࠔࠗ࡞ߩࠨࠗ࠭ߪᦨᄢ 100K ࡃࠗ. ߪ㧘J2ME ߇േߔࠆࠬࡕ࡞࠺ࡃࠗࠬ(៤Ꮺ㔚. ࠻ߣߔࠆ㧚ߔࠆߣᧄᣇᑼߢߪ㧘㧝ߟߩ↹ࡈࠔࠗ. ߿ PDA ߥߤ)ߦኻߒߡ㧘JXTA ࡊࡠ࠻ࠦ࡞ߣߩ. ࡞ࠍ࠳࠙ࡦࡠ࠼ߔࠆ㓙㧘ࠢࠗࠕࡦ࠻ߢߪ. ⋧ㆇ↪ᕈࠍᜬߚߖࠆߎߣߢࡇࠕ࠷ࡇࠕࠗࡦ. 18000㧛128ѳ141 ಽߩࡄࠤ࠶࠻߇⊒↢ߔࠆߎ. ࡈࠍឭଏߔࠆߎߣࠍ⋡ᜰߒߚ߽ߩߢࠆ㧚. ߣߦߥࠆ㧚. JXME ߦࠃࠅࡇࠕ࠷ࡇࠕࡀ࠶࠻ࡢࠢߦෳട. ৻ᣇ㧘JXME ߢߪࡐࡦࠣ߇ᔅⷐߦߥࠆ㧚. ߔࠆࠬࡕ࡞࠺ࡃࠗࠬߪ㧘ઁߩࠬࡕ࡞࠺ࡃࠗࠬ. ࡐࡦࠣ㧝࿁ߦ߆߆ࠆࡃࠗ࠻ᢙߪ㧠ࡃࠗ࠻㧘㧝. ߩઁ㧘࠺ࠬࠢ࠻࠶ࡊ߿ࡢࠢࠬ࠹࡚ࠪࡦ㧘ࠨ. ࡄࠤ࠶࠻ߣߒ㧘㧝⑽Ფߦࡐࡦࠣࠍⴕ߁߽ߩߣ. ࡃߢേߔࠆ JXTA ࡇࠕߣ߽㧘᭽ߥޘಣℂࠍ. ߔࠆ㧚↹ࡈࠔࠗ࡞ߩࠨࠗ࠭ߦߟߡߪ㧘ᧄᣇᑼ. ߦߔࠆߎߣ߇น⢻ߣߥࠆ㧚ૉߒ㧘JXME ߢߪ. ߣหߓߣߔࠆ㧚߹ߚ㧘㧝ߟߩ↹ࠍᓧࠆߩߦ߆߆. JXTA ߩᯏ⢻ߩౝ৻ㇱߪࠨࡐ࠻ߐࠇߡ߅ࠄߕ㧘. ࠆᤨ㑆ߪ㧝㧜⑽㧘ࡐࡦࠣ࿁ᢙߪ㧝㧜࿁ߣߒ㧘. JXME ᣇᑼߢߪࡇࠕ߇ᔅⷐਇนᰳߣߥࠆ. 㧝ߟߩ↹₪ᓧవࡇࠕߩㆬቯߦ߆߆ࠆᤨ㑆ߪ㧝. [8-9]㧚. ࿁ߩ↹₪ᓧߦߟ߈㧝㧜⑽ߣߔࠆ㧚એࠍၮߦࠢ. ᧄᣇᑼࠍ JXME ᣇᑼߣᲧセߒߚ႐วߩࡔ࠶ ࠻ߣߒߡߪ㧘߹ߕ㧘ᧄᣇᑼߢߪ㧘ⷫࡇࠕ㧘ሶࡇࠕ. ࠗࠕࡦ࠻ߩࡄࠤ࠶࠻㊂ߦߟߡ⸘▚ߔࠆߣ ࿑㧟ߩࠃ߁ߦߥߞߚ㧚. ߦหߓࡄࠗࡊࠕ࠼ࡃ࠲ࠗ࠭ࡔࡦ࠻ࠍߞߡ߿. ᧄᣇᑼߣ JXME ᣇᑼߦ߅ߌࠆࡇࠕᢙࠢࠗ. ࠅขࠅࠍⴕߞߡ߅ࠅ㧘ೋ߆ࠄߩ⟎ࠍᛠី. ࠕࡦ࠻ߩࡄࠤ࠶࠻㊂ࠍᲧセߔࠆߣ㧘ࡇࠕᢙ߇ 500. 6 −38−.
(7) ߩ႐วߦߪ㧘. ᢥ ₂. ᧄᣇᑼ㧛JXME ᣇᑼ=35,000㧛40,000=0.875. [1]ᤊว㓉ᚑ㧘̌P2P ✚⺰[Σ]̆ࡉࡠࠞࠬࡕ࠺࡞ߩ. ߣߥࠅ㧘ᧄᣇᑼߩᣇ߇ 12.5%ዋߥߊߡᷣߎߣߦ. ᚢ ̆ 㧘̍ 㔚 ሶ ᖱ ႎ ㅢ ା ቇ ળ ,Vol.87 㧘 No.9 㧘. ߥࠆ㧚. pp.804-811㧘2004 [2]Ⴆ↰ᤩม㧘᧲ẖม㧘᧲㇌ᒾ㧘᧻ㅴ㧘̌៤Ꮺ㔚. 㧢㧚߅ࠊࠅߦ. ะߌ P2P ࠨࡆࠬࠪࠬ࠹ࡓߩឭ᩺ߣࡊࡠ࠻࠲ࠗࡊ㐿. ᧄ⎇ⓥߢߪ㧘៤Ꮺ㔚↪ߩࠦࡦ࠹ࡦ࠷ߩᵹㅢߩ. ⊒ 㧘̍ ᖱ ႎ ಣ ℂ ቇ ળ ⎇ ⓥ ႎ ๔ 㧘 Vol.2002 㧘 No.47 㧘. ႐ߣߒߡ㧘৻⥸ߩ㧼㧯࡙ࠩߦߣߞߡߪᚑߒߚ. pp.51-56㧘2002. ៤Ꮺ㔚↪ߩࠦࡦ࠹ࡦ࠷߇ኈᤃߦ⊒߿ឭଏߢ. [3]Yunhao Liu㧘Li Xiao㧘Xiamei Liu㧘Lionel M.Ni㧘. ߈㧘৻ᣇ㧘៤Ꮺ㔚ߩ࡙ࠩߦߣߞߡߪ㧘ߘࠇࠍ. Xiaodong. ᚻシߦ↪ࠆߎߣ߇ߢ߈ࠆࠃ߁ߦ㧘JXTA ࠍ↪. Unstructured. ߚࠦࡦ࠹ࡦ࠷ត⚝㓸ߩߚߩࡂࠗࡉ࠶࠼ဳ. Transactions on Parallel and Distributed Systems㧘. ߩࠪࠬ࠹ࡓࠍឭ᩺ߒߚ㧚ࠨࡆࠬߩ৻ߣߒߡߪ㧘. Vol.16㧘No.2㧘2005. ᓙߜฃߌ↹ߩត⚝㓸ߩߚߩࠨࡆࠬࠪࠬ. [4] NTT ࠦࡓ࠙ࠚࠕ:ࠦࡦ࠹ࡦ࠷㈩ାߦ߅ߌࠆ P2P ࡕ. ࠹ࡓࠍขࠅߍ㧘⹜㛎⊛ߥ㐿⊒ࠍⴕߞߚ㧚. ࠺࡞ߣࠢࠗࠕࡦ࠻㧛ࠨࡃࡕ࠺࡞ߩᢛวߦ㑐ߔࠆឭ. ᧄࠪࠬ࠹ࡓࠍ↪ࠆߎߣߦࠃߞߡ㧘៤Ꮺ㔚ߩ. ᩺㧘. Zhang 㧘 ̌ Location Peer-to-Peer. Awareness. in. Systems 㧘 ̍ IEEE. http://www2.nttcom.co.jp/comtech/field. ࡙ࠩߪ៤Ꮺ㔚ߦᓥ᧪タߐࠇߡࠆࡉ࠙. /ftech0134.html. ࠩߢࠕࠢࠬߢ߈ࠆ▸࿐ߩᄖߩ㗔ၞ߆ࠄࠦࡦ࠹. [5] P2P for Java – JXTA,. ࡦ࠷ࠍᓧࠆߎߣ߇น⢻ߦߥࠅ㧘ߒ߆߽ࠦࡦ࠹ࡦ࠷. http://www.wakhok.ac.jp/~maruyama/jxta/html. ࠍតߔᚻ㑆ࠍ⋭ജൻߔࠆߎߣ߇ߢ߈ࠆࠃ߁ߦߥ. /index.html. ࠆ㧚߹ߚ㧘৻⥸ߩ㧼㧯࡙ࠩߦߣߞߡߪ㧘ᚑߒ. [6]Joseph D. Gradecki㧘 ̌Mastering Jxta: Building. ߚ CG ຠ╬ߩࠦࡦ࠹ࡦ࠷ࠍ⊒ឭଏߔࠆ႐߇. Java Peer-To-Peer Applications㧘̍John Wiley & Sons㧘. ᓧࠄࠇࠆߎߣߦߥࠆ㧚ᓟ㧘㧼㧯ߩࠦࡦ࠹ࡦ࠷. 2002. ࠰ࡈ࠻ߪ⋉ޘలታߒߡⴕߊߣ੍ᗐߐࠇࠆߩߢ㧘. [7]Brendon J.Wilson㧘ୖ㛽ᓆ㧘㊁రਯ⸶㧘(ᩣ)࠺. ߎࠇ߆ࠄߪ৻⥸ߩ㧼㧯࡙ࠩ߇ࠦࡦ࠹ࡦ࠷ࠍឭ. ࠲ㅢାࠪࠬ࠹ࡓ ᛛⴚផㅴㇱ⋙ୃ㧘̌JXTA ߩߔߴߡ. ଏߔࠆ႐߇ᔅⷐߣ⠨߃ࠄࠇ㧘ᧄࠪࠬ࠹ࡓߪߘߩߚ. P2PJava ࡊࡠࠣࡒࡦࠣ㧘̍ᣣ⚻㧮㧼␠㧘2003. ߩ৻ᣇᑼߢࠆ㧚ᓟߩ⺖㗴ߣߒߡߪ㧘࡙ࠩ. [8]Project JXTA㧘http://www.jxta.org/. ߇ᦸࠦࡦ࠹ࡦ࠷ࠍᓧࠆࠃ߁ߦߔࠆߚߦሶࡇ. [9]⍹ේ㧘ᱞᧄలᴦ㧘↰ਛஜ৻㇢㧘̌P2P ߣ J2ME. ࠕߢߩࠦࡦ࠹ࡦ࠷ߩࠞ࠹ࠧಽ㘃ߩᣇᴺߩᬌ⸛. ߩ Ⲣ ว ߦ ࠃ ࠆ ࡙ ࡆ ࠠ ࠲ ࠬ ␠ ળ ߳ ߩ Ꮣ ⍹ 㧘̍ JAVA. ߥߤ߇ߍࠄࠇࠆ㧚ᦝߦ㧘࿁ߪ㕒ᱛ↹ߩࠦࡦ࠹. PRESS㧘ᛛⴚ⹏⺰␠㧘Vol.28㧘pp.102㧙106㧘2003. ࡦ࠷ߩߺࠍᛒߞߡߚ߇㧘േ↹߿ Flash ߣߞ. [10] JXME JXTA Java Micro Edition Project,. ߚࠃࠅᄢኈ㊂ߩࠦࡦ࠹ࡦ࠷ߦ߽ኻᔕߢ߈ࠆ߽ߩ. http://jxme.jxta.org/. ߦߒߡߊߎߣ߽ᓟᬌ⸛ߒߡ߈ߚߣ⠨߃. [11] JXTA for Wireless Java Programmers,. ߡࠆ㧚. http://www.developer.com/ws/j2me/article.php /1464091. −39− 7.
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