ThPartyOpsImpl.mesa
Copyright © 1985, 1986 by Xerox Corporation. All rights reserved.
Last modified by D. Swinehart, May 22, 1986 4:23:06 pm PDT
DIRECTORY
BluejayUtils USING [ DescribeInterval ],
DESFace USING [ GetRandomKey, Key ],
IO,
Lark USING [ ConnectionSpecRec, KeyTableBody, VoiceSocket ],
RedBlackTree,
Pup USING [ Address, Socket ],
PupSocket USING [ Create, GetLocalAddress, Socket ],
RefID USING [ Seal ],
SafeStorage USING [ GetCanonicalType, Type ],
BasicTime USING [ Update, Now ],
Thrush USING [
AlertKind, CallUrgency, ConversationHandle, ConvEvent, ConvEventBody, Credentials, Dehandle, EncryptionKey, epoch, EventSequence, EventSequenceBody, H, IntervalSpec, IntervalSpecs, NB, nullConvHandle, nullHandle, nullKey, PartyHandle, PartyType, ProseSpec, ProseSpecs, Reason, ROPE, SHHH, SmartsHandle, StateID, StateInConv, ThHandle, unencrypted, VoiceTime ],
ThNet USING [ pd ],
ThParty,
ThPartyPrivate USING [
CFRec, CFRef, ConversationBody, ConversationData, DoDescribeParty, logSizeIncrement, PartyBody, PartyData, SmartsBody, SmartsData, Supervise ],
ThPartyMonitorImpl,
ThSmartsRpcControl USING [ InterfaceRecord ],
Triples USING [ Any, Foreach, ForeachProc, Make, Select ],
TU USING [ RefAddr ],
VoiceUtils USING [ Problem, ProblemFR ]
;
ThPartyOpsImpl: CEDAR MONITOR LOCKS root
IMPORTS
BluejayUtils,
DESFace,
root: ThPartyMonitorImpl,
RefID,
SafeStorage,
BasicTime,
IO,
PupSocket,
RedBlackTree,
ThNet,
ThPartyPrivate,
Thrush,
Triples,
TU,
VoiceUtils
EXPORTS ThParty, ThPartyPrivate
SHARES ThPartyMonitorImpl = {
Copies 
AlertKind: TYPE = Thrush.AlertKind;
CallUrgency: TYPE = Thrush.CallUrgency;
CFRef: TYPE = ThPartyPrivate.CFRef;
RTConvType: SafeStorage.Type = SafeStorage.GetCanonicalType[CODE[ThPartyPrivate.ConversationBody]];
ConvEvent: TYPE = Thrush.ConvEvent;
ConversationData: TYPE = ThPartyPrivate.ConversationData;
ConversationHandle: TYPE = Thrush.ConversationHandle;
Credentials: TYPE = Thrush.Credentials;
H: PROC[r: REF] RETURNS[Thrush.ThHandle] = INLINE {RETURN[Thrush.H[r]]; };
NB: TYPE = Thrush.NB;
none: SHHH = Thrush.unencrypted;
nullConvHandle: Thrush.ConversationHandle = Thrush.nullConvHandle;
nullHandle: Thrush.PartyHandle = Thrush.nullHandle;
PartyBody: TYPE = ThPartyPrivate.PartyBody; -- Concrete
RTPartyType: SafeStorage.Type = SafeStorage.GetCanonicalType[CODE[PartyBody]];
PartyData: TYPE = ThPartyPrivate.PartyData; -- REF Concrete
PartyHandle: TYPE = Thrush.PartyHandle; -- Handle
Reason: TYPE = Thrush.Reason;
ROPE: TYPE = Thrush.ROPE;
SHHH: TYPE = Thrush.SHHH;
SmartsBody: TYPE = ThPartyPrivate.SmartsBody; -- Concrete
SmartsData: TYPE = ThPartyPrivate.SmartsData; -- REF Concrete
RTSmartsType: SafeStorage.Type =SafeStorage.GetCanonicalType[CODE[SmartsBody]];
SmartsHandle: TYPE = Thrush.SmartsHandle; -- Handle
StateID: TYPE = Thrush.StateID;
StateInConv: TYPE = Thrush.StateInConv;
Conversation ID stuff
nextConv: ConversationHandle ← Thrush.epoch;
convClassIncrement: INT ← 100000000B; -- members of same class are identical in low 24 bits.
Implementation of ThParty
Alert: PUBLIC ENTRY PROC[
shhh: SHHH,
credentials: Credentials,
state: StateInConv←initiating,  -- IF reserved, reason specifies reason for cancelling prev.
reason: Reason←wontSay, -- IF reserving, specifies reason for cancelling last one.
calledPartyID: PartyHandle,
urgency: CallUrgency,
alertKind: AlertKind,
newConv: BOOLFALSE,
comment: ROPE
] RETURNS [ nb: NB, convID: ConversationHandle ] = {
ENABLE UNWIND => NULL;
cfRef: CFRef;
conv: ConversationData;
callingParty: PartyData;
calledParty: PartyData;
IF newConv OR credentials.convID=nullConvHandle THEN {
credentials.convID ← CreateConv[
partyID: credentials.partyID, convID: credentials.convID,
urgency: urgency, alertKind: alertKind].convID;
newConv←TRUE;
};
[conv, callingParty, cfRef, nb] ← Verify[credentials];
convID ← credentials.convID;
IF nb#success THEN RETURN;
IF cfRef#NIL AND cfRef.event.state=idle THEN {
nb ← AllIdle[conv];
IF nb#success THEN RETURN; };
conv.urgency ← urgency;
conv.alertKind ← alertKind;
IF calledPartyID # nullHandle OR state = initiating THEN {
calledParty ← DehandleParty[calledPartyID];
IF calledParty=NIL THEN {nb←noSuchParty2; RETURN};
<< Not satisfied with this, yet. If trunkParty info has been changed, don't make the call.>>
TRUSTED {
SELECT calledParty.type FROM
trunk => IF calledParty.reservedBy # credentials.partyID THEN {nb←noSuchParty2; RETURN};
ENDCASE;
};
IF calledPartyID=credentials.partyID THEN {nb←narcissism; RETURN};
[] ← PostConvEvent[conv: conv, party: calledParty, state: pending, reason: wontSay,
comment: comment ];
};
<< State must be initiating if calledPartyID#nullHandle. Nobody's checking. >>
[] ← PostConvEvent[conv: conv, party: callingParty, state: state, reason: reason,
smartsID: credentials.smartsID, comment: comment ];
};
Advance: PUBLIC ENTRY PROC[
shhh: SHHH,
credentials: Credentials,
state: StateInConv,
reason: Thrush.Reason,
comment: ROPE
] RETURNS [nb: NB] = {
ENABLE UNWIND => NULL;
conv: ConversationData; party: PartyData; cfRef: CFRef;
[conv, party, cfRef, nb] ← Verify[credentials];
IF nb#success THEN RETURN;
nb ← DoAdvance[credentials.smartsID, party, conv, cfRef, state, reason, comment];
};
DoAdvance: PUBLIC INTERNAL PROC [
smartsID: SmartsHandle,
party: PartyData,
conv: ConversationData,
cfRef: CFRef,
state: StateInConv,
reason: Thrush.Reason,
comment: ROPE
] RETURNS [nb: NB] = {
otherCfRef: CFRef;
otherParty: PartyData ← NIL;
otherState: Thrush.StateInConv;
OtherProc: Triples.ForeachProc ← SELECT state FROM
idle => IdleLast,
ringing, active => FindCaller,
ENDCASE => NIL;
IdleLast: Triples.ForeachProc = {
If there is exactly one remaining party that is not idle . . . now it will be.
WITH trip.att SELECT FROM
r: CFRef => {
otherState ← idle;
SELECT r.event.state FROM
idle => RETURN[TRUE];
ENDCASE=>NULL;
IF otherParty#NIL THEN { otherParty←NIL; RETURN[FALSE]; };
otherParty←NARROW[trip.val];
otherCfRef ← r; };
ENDCASE; };
FindCaller: Triples.ForeachProc = {
If callee is answering or threatening to answer, advance caller, too.
WITH trip.att SELECT FROM
r: CFRef => {
otherState ← IF state = ringing THEN maybe ELSE active;
SELECT r.event.state FROM
initiating, maybe => NULL;
ENDCASE => RETURN[TRUE];
otherParty ← NARROW[trip.val];
otherCfRef ← r;
RETURN[FALSE]; };
ENDCASE; };
SELECT validTransitions[state][cfRef.event.state] FROM
no, cantReq => RETURN[invalidTransition];
noop => RETURN; -- success
valid => NULL;
ENDCASE =>
VoiceUtils.ProblemFR["%g, %g: Impossible", $System, NIL, TU.RefAddr[party], TU.RefAddr[cfRef]];
cfRef←PostConvEvent[
conv: conv, party: party, smartsID: smartsID,
state: state, reason: reason, comment: comment];
nb ← success;
IF OtherProc#NIL THEN Triples.Foreach[Triples.Any, conv, Triples.Any, OtherProc];
IF otherParty # NIL THEN {
SELECT validTransitions[otherState][otherCfRef.event.state] FROM
no => { VoiceUtils.Problem[IO.PutFR["%g, %g, %g: State mismatch among parties",
TU.RefAddr[party], TU.RefAddr[otherParty], TU.RefAddr[cfRef]], $System]; RETURN; };
Must match the other, valid, one.
cantReq, valid => NULL;
noop => RETURN;
ENDCASE => { VoiceUtils.ProblemFR["%g, %g: Impossible", $System, NIL, TU.RefAddr[otherParty], TU.RefAddr[cfRef]]; RETURN; };
[]←PostConvEvent[
If another party to be changed was found; do it.
conv: conv, party: otherParty, state: otherState, reason: reason, comment: comment];
};
};
OtherParty: PUBLIC ENTRY PROC[
shhh: SHHH←none,
credentials: Credentials
] RETURNS[
nb: NB,
partyID: PartyHandle←nullHandle,
description: Thrush.ROPE,
conference: BOOLFALSE ] = {
conv: ConversationData;
[conv, , , nb] ← Verify[credentials];
IF nb=stateMismatch THEN nb←success;
IF nb#success THEN RETURN;
[partyID, conference] ← FindOtherParty[credentials.partyID, conv];
description ← SELECT TRUE FROM
conference => "Group of parties",
partyID#nullHandle => ThPartyPrivate.DoDescribeParty[partyID],
ENDCASE => NIL;
};
FindOtherParty: PUBLIC PROC[myPartyID: PartyHandle, conv: ConversationData]
RETURNS[partyID: PartyHandle←nullHandle, conference: BOOLFALSE ] = {
FOR i: NAT IN [1..conv.currentStateID] DO
ce: ConvEvent = conv.log[i];
IF myPartyID=ce.credentials.partyID THEN LOOP;
partyID ← ce.credentials.partyID;
IF conv.numParties>2 THEN { conference←TRUE; RETURN; };
EXIT; ENDLOOP;
};
CreateConversation: PUBLIC ENTRY PROC[
shhh: SHHH,
credentials: Credentials,
urgency: CallUrgency,
alertKind: AlertKind
] RETURNS [ nb: NB, convID: ConversationHandle ] = {
ENABLE UNWIND => NULL;
conv: ConversationData =
CreateConv[credentials.partyID, Thrush.nullConvHandle, urgency, alertKind];
RETURN[success, conv.convID];
};
CreateConv: INTERNAL PROC[
partyID: PartyHandle,
convID: ConversationHandle, -- non-null if want a related converation.
urgency: CallUrgency←normal,
alertKind: AlertKind←standard]
RETURNS [ conv: ConversationData←NIL ] = TRUSTED {
conv ← NEW[ThPartyPrivate.ConversationBody ← [
creatorPartyID: partyID,
timeOfID: BasicTime.Now[],
urgency: urgency, alertKind: alertKind,
log: NEW[Thrush.EventSequenceBody[ThPartyPrivate.logSizeIncrement]]]];
conv.keyTable ← NEW[Lark.KeyTableBody[20B]];
[]𡤎nterKey[conv, DESFace.GetRandomKey[]]; -- = this conv's key, will be key index 1.
conv.convID ← EnhandleConv[conv, convID];
};
DestroyConversation: PUBLIC INTERNAL PROC[ conv: ConversationData ] = {
IF conv.numParties#0 THEN VoiceUtils.ProblemFR["%g: Conversation still has parties", $System, NIL, TU.RefAddr[conv]];
KillHandleConv[conv.convID];
};
MergeConversations: PUBLIC PROC[
shhh: SHHH,
credentials: Credentials, -- of surviving conversation
otherStateID: StateID, -- of dissolving conversation
otherConvID: ConversationHandle
] RETURNS [ nb: NB ] = {NULL};
SetIntervals: PUBLIC ENTRY PROC[
shhh: SHHH ← none,
credentials: Credentials,
intervalSpecs: Thrush.IntervalSpecs
] RETURNS [ nb: NB ] = {
ENABLE UNWIND => NULL;
conv: ConversationData;
party: PartyData;
cfRef: CFRef;
WachetAuf: INTERNAL Triples.ForeachProc = {
WITH trip.att SELECT FROM
r: CFRef => { party←NARROW[trip.val]; ThPartyPrivate.Supervise[party]; }; ENDCASE; };
[conv, party, cfRef, nb] ← Verify[credentials];
IF nb#success THEN RETURN;
IF cfRef=NIL OR cfRef.event=NIL OR cfRef.event.state#active THEN RETURN[convNotActive];
[] ← PostConvEvent[conv, party, credentials.smartsID, cfRef.event.state, , ,intervalSpecs];
FOR iSL: Thrush.IntervalSpecs ← intervalSpecs, iSL.rest WHILE iSL#NIL DO
iS: Thrush.IntervalSpec = iSL.first;
IF ~ThNet.pd.encryptVoice THEN iS.keyIndex𡤀
IF iS.type=request THEN iS.intID.stateID ← conv.currentStateID;
ENDLOOP;
Triples.Foreach[Triples.Any, conv, Triples.Any, WachetAuf];
Wake all parties to conversation, now. Potential new key.
};
SetProse: PUBLIC ENTRY PROC[
shhh: SHHH ← none,
credentials: Credentials,
proseSpecs: Thrush.ProseSpecs
] RETURNS [ nb: NB ] = {
ENABLE UNWIND => NULL;
conv: ConversationData;
party: PartyData;
cfRef: CFRef;
WachetAuf: INTERNAL Triples.ForeachProc = {
WITH trip.att SELECT FROM
r: CFRef => { party←NARROW[trip.val]; ThPartyPrivate.Supervise[party]; }; ENDCASE; };
[conv, party, cfRef, nb] ← Verify[credentials];
IF nb#success THEN RETURN;
IF cfRef=NIL OR cfRef.event=NIL OR cfRef.event.state#active THEN RETURN[convNotActive];
[] ← PostConvEvent[conv, party, credentials.smartsID, cfRef.event.state, , , , proseSpecs];
FOR pSL: Thrush.ProseSpecs ← proseSpecs, pSL.rest WHILE pSL#NIL DO
pS: Thrush.ProseSpec = pSL.first;
IF pS.type=request THEN pS.intID.stateID ← conv.currentStateID;
ENDLOOP;
Triples.Foreach[Triples.Any, conv, Triples.Any, WachetAuf];
Wake all parties to conversation, now. Potential new key.
};
DescribeInterval: PUBLIC PROC[
shhh: SHHH ← none,
credentials: Credentials,
targetInterval: Thrush.IntervalSpec,
minSilence: Thrush.VoiceTime ← 1 -- Smallest silent interval that will be considered silence.
]
RETURNS [ nb: NB, exists: BOOLFALSE, intervals: Thrush.IntervalSpecs←NIL ] = {
conv: ConversationData;
party: PartyData;
cfRef: CFRef;
[conv, party, cfRef, nb] ← VerifyEnt[credentials];
IF nb#success AND nb#stateMismatch THEN RETURN;
[exists, intervals] ← BluejayUtils.DescribeInterval[targetInterval.tune, targetInterval.interval, minSilence];
};
RegisterKey: PUBLIC ENTRY PROC [
shh: SHHH ← none,
credentials: Credentials,
stateID: StateID,
partyID: PartyHandle,
smartsID: SmartsHandle,
convID: ConversationHandle,
key: Thrush.EncryptionKey ]
RETURNS [ nb: NB, keyIndex: [0..17B] ← 0 ] = {
ENABLE UNWIND => NULL;
conv: ConversationData;
cfRef: CFRef;
[conv, , cfRef, nb] ← Verify[credentials];
Don't care about stateMismatch here.
IF nb=success OR nb=stateMismatch THEN keyIndex ← EnterKey[conv, key].keyIndex;
};
SetSubject: PUBLIC ENTRY PROC[ shh: SHHH, convID: ConversationHandle, subject: ROPE ] = {
ENABLE UNWIND => NULL;
conv: ConversationData = DehandleConv[convID];
IF conv=NIL THEN RETURN ELSE conv.subject ← subject; };
GetSubject: PUBLIC ENTRY PROC[ shh: SHHH, convID: ConversationHandle ] RETURNS [subject: ROPE] = {
ENABLE UNWIND => NULL;
conv: ConversationData = DehandleConv[convID];
RETURN[IF conv=NIL THEN NIL ELSE conv.subject]; };
ConversationsForParty: PUBLIC ENTRY PROC [ shh: SHHH←none, partyID: PartyHandle ] = {
party: PartyData ← DehandleParty[partyID];
ReallyWachetAuf: INTERNAL Triples.ForeachProc = {
WITH trip.att SELECT FROM
r: CFRef => {
conv: ConversationData ← NARROW[trip.obj];
r.lastNotedID ← 0;
ThPartyPrivate.Supervise[party];
};
ENDCASE;
};
IF party#NIL THEN Triples.Foreach[Triples.Any, Triples.Any, party, ReallyWachetAuf];
};
Utilities
VerifyEnt: PUBLIC ENTRY PROC[ credentials: Credentials
] RETURNS [
conv: ConversationData,
party: PartyData,
cfRef: CFRef,
nb: Thrush.NB ] = {
[conv, party, cfRef, nb] ← Verify[credentials];
};
Verify: PUBLIC INTERNAL PROC[ credentials: Credentials
] RETURNS [
conv: ConversationData,
party: PartyData,
cfRef: CFRef,
nb: Thrush.NB ] = {
Validate parameters: existence, in conversation, state match; produce dehandled values.
Validation for smarts is only partial; verifies that it's a smarts.
smarts: SmartsData ← DehandleSmarts[credentials.smartsID];
conv�handleConv[credentials.convID];
party�handleParty[credentials.partyID];
nb ← SELECT NIL[REF ANY] FROM
smarts=> noSuchSmarts,
party=> noSuchParty,
conv=> noSuchConv,
ENDCASE=> success;
IF nb=success AND party#NIL THEN
IF party.partyFailed THEN nb←noSuchParty
ELSE IF party.numEnabled=0 THEN nb ← partyNotEnabled;
IF conv#NIL AND party#NIL THEN
cfRef ← NARROW[Triples.Select[--cfRef--, conv, party]];
IF nb=success THEN
IF cfRef#NIL THEN { IF credentials.stateID<cfRef.lastPostedID THEN nb←stateMismatch }
ELSE IF credentials.stateID#conv.currentStateID THEN nb←stateMismatch;
IF cfRef=NIL THEN SELECT nb FROM
success => IF credentials.stateID#0 THEN nb ← notInConv;
stateMismatch => nb ← notInConv;
ENDCASE;
};
PostConvEvent: INTERNAL PROC[
conv: ConversationData,
party: PartyData,
smartsID: SmartsHandle ← nullHandle,
state: Thrush.StateInConv,
reason: Thrush.Reason←wontSay,
comment: Thrush.ROPE←NIL,
intervalSpecs: Thrush.IntervalSpecs←NIL,
proseSpecs: Thrush.ProseSpecs←NIL
] RETURNS [cfRef: CFRef←NIL] = {
event, lastEvent: ConvEvent;
lastState: Thrush.StateInConv;
conv.currentStateID ← conv.currentStateID+1;
conv.timeOfID ← BasicTime.Now[];
TRUSTED {
event ← NEW[Thrush.ConvEventBody ← [
credentials: [ H[party], smartsID, conv.convID, conv.currentStateID ],
time: conv.timeOfID,
state: state, reason: reason, urgency: conv.urgency, alertKind: conv.alertKind,
address: (SELECT party.type FROM
trunk => party.outgoing, ENDCASE => NIL),
comment: comment,
intervalSpecs: intervalSpecs,
proseSpecs: proseSpecs
]];
};
InsertEvent[conv, event];
IF conv.newKeyTable THEN event.keyTable ← conv.keyTable;
conv.newKeyTable←FALSE;
cfRef ← NARROW[Triples.Select[--cfRef--, conv, party]];
IF cfRef = NIL THEN {
cfRef ← NEW[ThPartyPrivate.CFRec ← [
event: NIL,
sockID: NewId[] ]];
In Cedar 6.1 and thereafter, socket numbers cannot be invented but must be assigned by the implementation of PupSocket. For this version of Thrush/Bluejay, only Bluejay uses a Cedar socket, and only Bluejay provide parties of type $service, so only it needs to be dealt with, and we can tell if that's what we have by looking at the type. We create the PupSocket.Socket here (without specifying the remote address), jam it into a RefID, and store the RefID in cfRef (RefID because theoretically Jay may not be local, and because we may have to pass it as a long cardinal into Bluejay somewhere). We record the assigned socket ID in cfRef.sockID. BluejaySmarts knows how to take all this apart. We will destroy the RefID when the cfRef.
IF party.type = $service THEN {
pa: Pup.Address;
socket: REF PupSocket.Socket = NEW[PupSocket.Socket ← PupSocket.Create[getTimeout: 100]]; -- See BluejaySmartsImpl
cfRef.socket ← RefID.Seal[socket];
pa ← PupSocket.GetLocalAddress[socket^];
cfRef.sockID ← LOOPHOLE[pa.socket];
};
Triples.Make[cfRef, conv, party];
conv.numParties ← conv.numParties+1;
party.numConvs ← party.numConvs+1; };
Ferret out voice smarts, if need be.
SELECT state FROM
initiating, active, canActivate => IF cfRef.voiceSmartsID=nullHandle THEN {
smarts: SmartsData ← DehandleSmarts[smartsID];
IF smarts#NIL THEN WITH smarts.properties SELECT FROM
backstop, supervisor => NULL; -- << ERROR? >>
voiceTerminal => cfRef.voiceSmartsID ← smartsID;
manager => {
smarts ← NARROW[Triples.Select[$AdjacentTerminal, party, -- smarts --]];
IF smarts # NIL THEN cfRef.voiceSmartsID ← H[smarts]; };
ENDCASE; };
ENDCASE;
Maintain active party counts, generate connection specifications.
lastEvent ← cfRef.event;
lastState ← IF lastEvent=NIL THEN idle ELSE lastEvent.state;
cfRef.event ← event;
cfRef.lastPostedID ← conv.currentStateID;
IF state=active THEN {
IF lastState#active THEN
IF party.partyActive THEN event.state ← canActivate
ELSE [] ← Activate[conv, cfRef, party] } --<<Should complain if result is false, here?>>
ELSE IF lastState = active THEN {
party.partyActive ← FALSE; conv.numActive ← conv.numActive - 1; };
ThPartyPrivate.Supervise[party];
};
Activate: INTERNAL PROC[conv: ConversationData, myCfRef: CFRef, myParty: PartyData]
Generate a Lark.ConnectionSpec for this conversant.
RETURNS[isSpec: BOOLFALSE] = {
sockets: ARRAY[0..2) OF Lark.VoiceSocket;
parties: ARRAY[0..2) OF PartyData;
specIndex: NAT𡤀
GetOneActive: INTERNAL Triples.ForeachProc = {
cfRef: CFRef;
smarts: SmartsData;
sockID: Pup.Socket;
party: PartyData = NARROW[trip.val];
IF specIndex>=2 THEN RETURN[FALSE];
WITH trip.att SELECT FROM r: CFRef => cfRef ← r; ENDCASE=> RETURN[TRUE];
IF cfRef.voiceSmartsID = nullHandle THEN RETURN[TRUE];
smarts ← DehandleSmarts[cfRef.voiceSmartsID];
IF smarts=NIL THEN RETURN--[FALSE]--; -- fail back
sockID ←LOOPHOLE[
IF party=myParty AND party.type=$service THEN cfRef.socket ELSE cfRef.sockID];
See earlier comments about Cedar 6.1 communications accommodation.
WITH smarts.properties SELECT FROM
voiceTerminal => sockets[specIndex] ← [ [ netAddress.net], [netAddress.host], sockID ];
ENDCASE => VoiceUtils.Problem["Non-voice terminal trying to be voice smarts", $System];
parties[specIndex] ← party;
specIndex ← specIndex+1; };
myParty.partyActive←TRUE;
conv.numActive ← conv.numActive + 1;
Triples.Foreach[Triples.Any, conv, Triples.Any, GetOneActive];
IF specIndex#2 THEN RETURN[FALSE];
SELECT myParty FROM
=parties[0] => specIndex ← 0;
=parties[1] => specIndex ← 1;
ENDCASE => VoiceUtils.Problem["Impossible", $System];
myCfRef.event.spec ← NEW[Lark.ConnectionSpecRec ← [
protocol: interactive,
encoding: muLaw,
sampleRate: 8000,
packetSize: 160, -- sample bytes, that is.
buffer: out1,
keyIndex: IF ThNet.pd.encryptVoice THEN 1 ELSE 0,
localSocket: sockets[specIndex],
remoteSocket: sockets[1-specIndex],
blankA: 0
]];
RETURN[TRUE];
};
GetEvent: PUBLIC INTERNAL PROC[conv: ConversationData, stateID: Thrush.StateID]
RETURNS [ Thrush.ConvEvent←NIL ] = {
IF conv=NIL THEN VoiceUtils.ProblemFR["%g: No such conversation", $System, NIL, TU.RefAddr[conv]]
ELSE IF stateID=0 THEN RETURN[NIL]
ELSE IF stateID>=conv.log.size THEN VoiceUtils.Problem["State ID out of range", $System]
ELSE RETURN[conv.log[stateID]]; };
InsertEvent: INTERNAL PROC[conv: ConversationData, entry: ConvEvent] = {
IF conv.currentStateID >= conv.log.size THEN {
oldLog: Thrush.EventSequence = conv.log;
newLog: Thrush.EventSequence =
NEW[Thrush.EventSequenceBody[oldLog.size+ThPartyPrivate.logSizeIncrement]];
FOR i: NAT IN [0..oldLog.size) DO newLog[i]←oldLog[i]; ENDLOOP;
conv.log ← newLog; };
conv.log[conv.currentStateID] ← entry; };
NewId: PROC RETURNS [ LONG CARDINAL ] = TRUSTED {
idKey: DESFace.Key ← DESFace.GetRandomKey[]; -- connection specs.
keys: LONG POINTER TO ARRAY[0..2) OF LONG CARDINAL
LOOPHOLE[LONG[@idKey]];
RETURN[keys[0]]; };
AllIdle: INTERNAL PROC[conv: ConversationData] RETURNS [nb: Thrush.NB] = {
allAreIdle: BOOLTRUE;
OneIdle: Triples.ForeachProc = {
Complains unless all parties in conversation are presently idle.
WITH trip.att SELECT FROM
r: CFRef => IF r.event.state#idle THEN {
allAreIdle←FALSE; RETURN[FALSE]; };
ENDCASE;};
Triples.Foreach[Triples.Any, conv, Triples.Any, OneIdle];
RETURN[IF allAreIdle THEN success ELSE invalidTransition]; };
Conversation Handle management
convTable: RedBlackTree.Table = RedBlackTree.Create[ConvGet, ConvCompare];
ConvTableEntry: TYPE = REF ConvTableRecord;
ConvTableRecord: TYPE = RECORD [
convID: ConversationHandle,
conv: ConversationData
];
cTE: ConvTableEntry ← NEW[ConvTableRecord ← [nullConvHandle, NIL]];
NB. Above works as long as procedures below remain locked by SINGLE monitor.
DehandleConv: PUBLIC INTERNAL PROC[ convID: ConversationHandle]
At present, called only from Verify
RETURNS [conv: ConversationData←NIL ] = {
convEntry: ConvTableEntry;
cTE.convID ← convID;
convEntry ← NARROW[convTable.Lookup[cTE]];
RETURN[IF convEntry#NIL THEN convEntry.conv ELSE NIL];
};
EnhandleConv: INTERNAL PROC[ conv: ConversationData, convClassID: ConversationHandle ]
Called only from CreateConv.
RETURNS [ convID: ConversationHandle←nextConv ] = {
entry: ConvTableEntry;
IF convClassID#nullConvHandle THEN
convID ← BasicTime.Update[convClassID, convClassIncrement]
ELSE nextConv ← BasicTime.Update[nextConv, 1];
cTE.convID ← convID;
IF convTable.Lookup[cTE]#NIL THEN {
IF convClassID#nullConvHandle THEN RETURN EnhandleConv[conv,convID];
VoiceUtils.Problem["Struct. broken", $System]; RETURN[Thrush.nullConvHandle]; };
entry ← NEW[ConvTableRecord ← [convID, conv]];
convTable.Insert[entry, entry];
};
KillHandleConv: INTERNAL PROC[ convID: ConversationHandle ] = {
Called only from DestroyConversation
cTE.convID ← convID;
[]𡤌onvTable.Delete[cTE];
};
ConvCompare: RedBlackTree.Compare = {
keyRec: ConvTableEntry = NARROW[k];
convRec: ConvTableEntry = NARROW[data];
c1: LONG CARDINAL = LOOPHOLE[keyRec.convID, LONG CARDINAL];
c2: LONG CARDINAL = LOOPHOLE[convRec.convID, LONG CARDINAL];
RETURN[SELECT c1 FROM
< c2 => less,
> c2 => greater,
ENDCASE => equal
];
};
ConvGet: RedBlackTree.GetKey = { RETURN[data]; };
DehandleParty: PUBLIC PROC[partyID: Thrush.PartyHandle, insist: BOOLEANFALSE]
RETURNS[party: PartyData] = TRUSTED {
RETURN[LOOPHOLE[Thrush.Dehandle[partyID, RTPartyType, insist]]];
};
DehandleSmarts: PUBLIC PROC[smartsID: Thrush.SmartsHandle, insist: BOOLEANFALSE]
RETURNS[smarts: SmartsData] = TRUSTED {
RETURN[LOOPHOLE[Thrush.Dehandle[smartsID, RTSmartsType, insist]]];
};
Key Table management
EKResults: TYPE = { new, duplicate, disagreement, full };
EnterKey: INTERNAL PROC[conv: ConversationData,
key: Thrush.EncryptionKey]
RETURNS [ keyIndex: [0..17B], results: EKResults] = {
Presently returns full if table is full; user should hang up and restart.
Move-to-front would work nicely here!!
IF key=Thrush.nullKey THEN RETURN[0, duplicate];
FOR keyIndex IN [1..17B] DO
IF conv.keyTable[keyIndex]=key THEN RETURN[keyIndex, duplicate]
ELSE IF conv.keyTable[keyIndex][0].b=0 AND conv.keyTable[keyIndex] = Thrush.nullKey THEN EXIT;
REPEAT FINISHED => RETURN[0, full]; ENDLOOP;
conv.keyTable[keyIndex] ← key;
conv.newKeyTable ← TRUE;
RETURN[keyIndex, new];
};
Initialization
Validity: TYPE = {
noop,   -- Already in this state; no transition action required
valid,   -- This transition is all right if other tests check out.
no,   -- This transition is not allowed, nohow.
cantReq  -- This transition may not be requested by the Party-level client.
};
validTransitions: ARRAY Thrush.StateInConv OF ARRAY Thrush.StateInConv OF Validity = [
Columns represent present state: rows represent proposed new states
[ noop, valid, valid, valid, valid, valid, valid, valid, valid, valid, no ], -- idle
[ valid, noop, valid, no, no, no, no, no, no, no, no ], -- reserved
[ valid, valid, noop, no, no, no, no, no, no, no, no ], -- parsing
[ valid, valid, valid, noop, no, no, no, no, no, no, no ], -- initiating
[ cantReq, cantReq, cantReq, no, noop, no, no, no, no, no, no ], -- pending
[ no, no, no, cantReq, no, noop, no, no, no, no, no ], -- maybe
[ no, no, no, no, valid, no, noop, no, no, no, no ], -- ringing
[ cantReq, cantReq, cantReq, cantReq, cantReq, cantReq, cantReq, noop, no, cantReq, no ], -- canAct
[ valid, valid, valid, cantReq, valid, cantReq, valid, valid, noop, valid, no ], -- active
[ no, no, no, no, no, no, no, valid, valid, noop, no ], -- inactive
[ no, no, no, no, no, no, no, no, no, no, no ] -- any
];
}.
Swinehart, May 15, 1985 10:46:39 am PDT
changes to: SetProse, DescribeInterval, PostConvEvent
Swinehart, May 16, 1985 10:09:48 am PDT
Switch to RedBlackTree for conversation handle stuff
changes to: DIRECTORY, ThPartyOpsImpl, nextConv, convTable, cID, ConvTableEntry, ConvTableRecord, DehandleConv, EnhandleConv, KillHandleConv, ConvCompare, ConvGet, EnterKey
Swinehart, May 17, 1986 4:06:14 pm PDT
Cedar 6.1
changes to: DIRECTORY, GetOneActive