Application protocol. Presentation protocol. Session protocol. Transport protocol. Network protocol. Data link protocol. Physical protocol.

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4 Application Presentation Session Transport Network Data link Physical Application protocol Presentation protocol Session protocol Transport protocol Network protocol Data link protocol Physical protocol Network

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8 Client Request Synchronize at request submission Synchronize at request delivery Transmission interrupt Storage facility Synchronize after processing by server Reply Server Time

9 Client Request Synchronize at request submission Synchronize at request delivery Transmission interrupt Storage facility Synchronize after processing by server Reply Server Time

10 Client Request Synchronize at request submission Synchronize at request delivery Transmission interrupt Storage facility Synchronize after processing by server Reply Server Time

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16 Client Server Call remote procedure Request Wait for result Reply Call local procedure and return results Return from call Time

17 Client machine Server machine Client process k = add(i,j) proc: "add" int: val(i) int: val(j) 1. Client call to procedure Server stub Client stub 2. Stub builds message Server process Implementation of add k = add(i,j) proc: "add" int: val(i) int: val(j) 6. Stub makes local call to "add" 5. Stub unpacks message Client OS proc: "add" int: val(i) int: val(j) Server OS 4. Server OS hands message to server stub 3. Message is sent across the network

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21 Client Wait for result Client Wait for acceptance Call remote procedure Return from call Call remote procedure Return from call Request Reply Request Accept request Server Call local procedure and return results Time Server Call local procedure Time (a) (b)

22 Client Wait for acceptance Interrupt client Server Call remote procedure Request Return from call Accept request Call local procedure Return results Acknowledge Time Call client with one-way RPC

23 Uuidgen Interface definition file IDL compiler Client code Client stub Header Server stub Server code #include #include C compiler C compiler C compiler C compiler Client object file Client stub object file Server stub object file Server object file Linker Runtime library Runtime library Linker Client binary Server binary

24 Directory machine Client machine 3. Look up server Directory server 2. Register service Server machine Client 5. Do RPC Server 1. Register endpoint 4. Ask for endpoint DCE daemon Endpoint table

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28 Server socket bind listen accept read write close Synchronization point Communication socket connect write read close Client

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32 Source client Message broker Repository with conversion rules and programs Destination client Broker program OS Queuing layer OS OS Network

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35 Sending client Routing table Send queue Client's receive queue Receiving client Program Queue manager Queue manager Program MQ Interface Stub Server stub MCA MCA MCA MCA Server stub Stub RPC (synchronous) Local network Message passing (asynchronous) Enterprise network To other remote queue managers

36 Alias table LA1 QMC LA2 QMD SQ2 QMA Routing table QMB QMC QMD SQ1 SQ1 SQ2 SQ1 Alias table LA1 QMA LA2 QMD SQ1 Routing table QMA SQ1 QMC SQ1 QMD SQ1 QMB Routing table QMA SQ1 QMC SQ2 QMB SQ1 QMD SQ1 SQ2 Alias table LA1 QMA LA2 QMC QMC SQ1 Routing table QMA SQ1 QMB SQ1 QMD SQ1