1 - ΣΔΥ50 - ΟΣΣ4 - Κοινά Λάθη Στην ΓΕ3
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Transcript of 1 - ΣΔΥ50 - ΟΣΣ4 - Κοινά Λάθη Στην ΓΕ3
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3:
: Java RMI
client/server
callbacks.
: -
Buffer 1
DHT P2P
Pastry
(RMI, CORBA, Web Services)
.
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Java RMI . :
1. Netbeans
build (.. registry, ..)
2. projects,
. projects : _AM_StockClient,_AM_StockServer. To project client :
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i. StockPriceModifier.
. :
.. INTRALOT 3.56
server ( stockChange()). , server (callback )
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ii. StockPriceMonitor. H remoteinterface StockPriceListener. To interface stockPriceUpdate terminate. server. H
stockPriceUpdate() . H (.. output Netbeans). terminate() server ( )
. H username addStockPriceListener()server ( StockPriceProviderinterface). server
client (callback ):
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ii. StockRegistration.
(Register) (Unregister) . H
username
:R U
, server removeStockPriceListener(). server callback
terminate() client ( StockPriceMonitor)
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3. server remote interface StockPriceProvider. To interface :i. stockChange(): StockPriceModifier
.
ii. register() : StockClientRegistration .
iii. unRegister(): StockClientRegistration .
iv. addStockPriceListener(): StockPriceMonitor
server .v. removeStockPriceListener():
StockClientRegistration .
StockPriceProvider interface StockPriceProviderServant.
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4. remote interfaces .
5. . . -
callbacks .
6.
: DEH, OTE OPAP, INTRALOT INTRACOM. .
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7. (.. ).
8. M localhost (IP address127.0.0.1).
9. security manager security policy .
10. .
11. , .
12. , , ,
.
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, , , , () .
() sockets .
, RMI. 11
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/ : .
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2 projects client server
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/ : / (..
).
server :
) callback )
)
target
(.. )
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- 2 callbacks callbacks
client-server.
callbacks .
(~ 120 )
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.2
callback
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1 - (Producer)
0 9 Buffer, . (Consumer),
Buffer ( Producer ), . :
: 0
: 0
: 1
: 1
: 9
: 916
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1 - (
Producer Consumer) Buffer:class Buffer {
private int item;
public int get() {
return item;
}
public void put(int value) {
item = value;
}
}
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1 - )
Buffer; . [5 ]
) ; Buffer . [7]
) NetBeans . [7 ]
(~ 350 )
: (.. 100 ms)
.
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. / :
( Buffer) .
(race condition). synchronized get/put.
(buffer)
O get/put
. multithreading.
T get put synchronized !
Buffer, out of synch 19
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2 Java block
.
(~ 70 ).
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.2 .
block
server.
(.. this).
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&
1 DHT Pastry Distributed Hash Table (DHT)
Pastry.
(~120 ).
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.1
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: DHT
overlay.
DHT (K,V), K V .
DHT , (lookup (key)), .
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&
2 Pastry Pastry .
(GUID) :312132,310332,311200.
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.2
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:
,
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310332 o 311020 310213.
310332, routing table (. entry GUID 310332 ).
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3 RMI, CORBA, Web Services RMI, CORBA Web Services
.
RMI CORBA Web Services.
Web Services CORBA RMI.
CORBA RMI Web Services.
(~100 )
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