DIRECTORY
Basics USING [UnsafeBlock],
BasicTime USING [GMT, Now, nullGMT, Period, Update],
Camelot USING [btidT, tidT],
IO USING [EndOfStream, GetChar, GetLength, GetRope, STREAM, UnsafeGetBlock],
PBasics USING [charsPerWord],
Process USING [Detach, MsecToTicks, Pause, SetTimeout, Ticks],
RedBlackTree USING [Compare, Create, Delete, GetKey, Insert, InsertNode, Lookup, Node, Size, Table, UserData],
RefText USING [ObtainScratch, ReleaseScratch],
Rope USING [Concat, Compare, Fetch, FromRefText, IsEmpty, ROPE],
SafeStorage USING [CantEstablishFinalization, EnableFinalization, EstablishFinalization, FinalizationQueue, FQNext, NewFQ],
YggDID USING [DID],
YggDIDPrivate USING [DIDRep],
YggDIDMap USING [GetComponentFiles, MarkInterestInDID, OpenDocumentFromDID],
YggEnvironment USING [AccessRights, LockMode, LockOption, nullDID, nullTransID, TransID],
YggFileStream USING [StreamFromComponentFilesAndTid],
YggFixedNames USING [AutoIndices, ChildContainers, Children, Contents, Inlinks, Outlinks, ParentContainers, Parents],
YggInternal USING [Document, FileHandle],
YggLock USING [Failed, MakeLockID, Set],
YggMonitoringLog USING [LockConflictInfo, notice],
YggRep USING [AccurateGMT, AccurateGMTRep, AccurateGMTRepByteSize, Attribute, AttributePreambleByte, AttributeValue, Bits, BitsFromBits, BitsRep, date, float, did, int, metaAttributeMod, noValue, rope, shortRope, TypedPrimitiveElement, unknown, uninterpretedBytes, VDoc, VDocRep],
YggTransaction USING [EqualTrans, GetParent, IsNullTrans, NotePossibleDocumentUpdate],
YggVolatileObjectCache;

YggVolatilizeImpl: CEDAR MONITOR
IMPORTS BasicTime, IO, Process, RedBlackTree, RefText, Rope, SafeStorage, YggDIDMap, YggFileStream, YggFixedNames, YggLock, YggMonitoringLog, YggRep, YggTransaction
EXPORTS YggDID, YggRep, YggVolatileObjectCache
~ BEGIN

ROPE: TYPE ~ Rope.ROPE;

scratchBuffSize: INT = 128;

didCache: RedBlackTree.Table;
desiredSizeOfDIDCache: INT _ 500;  -- move this up after debuggng

cacheEntry: TYPE ~ REF cacheEntryRep;
cacheEntryRep: TYPE ~ RECORD [
users: INT _ 0,
timeOfLastVolatize: BasicTime.GMT _ BasicTime.nullGMT,
vDoc: YggRep.VDoc _ NIL
];
myCondition: CONDITION;
latchCondition: CONDITION;
aTickCondition: CONDITION;

DID: PUBLIC TYPE ~ REF DIDRep;
DIDRep: PUBLIC TYPE ~ YggDIDPrivate.DIDRep;

Now: BasicTime.GMT _ BasicTime.Now[];

EmptyRope: ROPE _ "";

ListOfFinalizedVDocs: LIST OF YggRep.VDoc _ NIL;
ListOfFinalizedVDocsLast: LIST OF YggRep.VDoc _ NIL;

DoubleVDoc: TYPE = RECORD [
aOne: YggRep.VDoc,
andATwo: YggRep.VDoc 
];
VDocsAllocList: LIST OF DoubleVDoc _ NIL;

MyQueue: SafeStorage.FinalizationQueue = SafeStorage.NewFQ[length: 200];



VolatizeFromDID: PUBLIC PROC [transID: YggEnvironment.TransID, did: YggDID.DID, 
access: YggEnvironment.AccessRights, lock: YggEnvironment.LockOption, metaAttributesOnly: BOOL]
RETURNS [vDoc: YggRep.VDoc _ NIL] ~ {
parseAttributes: PROC [attrStream: IO.STREAM] RETURNS [attributeList: LIST OF YggRep.Attribute _ NIL, contentsAttribute: YggRep.TypedPrimitiveElement _ [YggRep.unknown, NIL], outlinksAttribute: LIST OF YggRep.AttributeValue _ NIL, inlinksAttribute: LIST OF YggRep.AttributeValue _ NIL, metaAttributes: LIST OF YggRep.Attribute _ NIL]  = {
readInt: PROC RETURNS [int: INT] = {
charsRead: INT _ 0;
rint: REF INT;
rint _ NEW[INT];
TRUSTED {charsRead _ IO.UnsafeGetBlock[attrStream, [LOOPHOLE[rint], 0, BYTES[INT]]];};
IF charsRead # BYTES[INT] THEN ERROR;
RETURN[rint^];
};
readString: PROC [extraChars: INT] RETURNS [string: ROPE _ NIL]= {
nullFound: BOOL _ FALSE;
lenInScratch: INT _ 0;
numberToFetch: INT _ PBasics.charsPerWord-extraChars;
fourChars: REF PACKED ARRAY [0..PBasics.charsPerWord) OF CHAR;
scratch: REF TEXT = RefText.ObtainScratch[scratchBuffSize];
fourChars _ NEW[PACKED ARRAY [0..PBasics.charsPerWord) OF CHAR];
UNTIL nullFound DO
charsRead: INT _ 0;
TRUSTED {charsRead _ IO.UnsafeGetBlock[attrStream, [LOOPHOLE[fourChars], 0 , numberToFetch]];};
IF charsRead # numberToFetch THEN ERROR;
FOR charNo: INT IN [0..numberToFetch) DO
IF fourChars[charNo] = 0C THEN {nullFound _ TRUE; EXIT};
scratch[lenInScratch] _ fourChars[charNo];
lenInScratch _ lenInScratch + 1;
IF lenInScratch = scratchBuffSize THEN {
scratch.length _ lenInScratch;
string _ Rope.Concat[string, Rope.FromRefText[s: scratch, start: 0, len: lenInScratch]];
lenInScratch _ 0;
};
ENDLOOP;
numberToFetch _ PBasics.charsPerWord;
ENDLOOP;
IF lenInScratch # 0 THEN {
scratch.length _ lenInScratch;
string _ Rope.Concat[string, Rope.FromRefText[s: scratch, start: 0, len: lenInScratch]];
};
RefText.ReleaseScratch[scratch];
};
doneWithAttributes: BOOL _ FALSE;
attributeListLast: LIST OF YggRep.Attribute _ NIL;
metaAttributeListLast: LIST OF YggRep.Attribute _ NIL;
contentsDocType _ readInt[];
DO  -- for each attribute
attributeName: ROPE _ NIL;  --  attribute name
attributeValue: LIST OF YggRep.AttributeValue _ NIL;  --  attribute name
attributeValueLast: LIST OF YggRep.AttributeValue _ NIL;  --  attribute name
numberOfAttributeValues: INT _ 1;
preampleByte: CHAR;
preample: YggRep.AttributePreambleByte;
fieldDocType: CARD;
TRUSTED {preampleByte _ IO.GetChar[attrStream ! IO.EndOfStream => {
doneWithAttributes _ TRUE;
CONTINUE;
};
 ];};  -- @preample points to preample[0]
IF doneWithAttributes THEN EXIT;
preample _ LOOPHOLE[preampleByte];
fieldDocType _ SELECT preample.typeCode FROM
integer => YggRep.int,
ropeLarge => YggRep.rope,
ropeShort => YggRep.shortRope,
float => YggRep.float,
date => YggRep.date,
did => YggRep.did,
uninterpretedBytes => YggRep.uninterpretedBytes,
ENDCASE => YggRep.unknown;
attributeName _ readString[1];  --  read attribute name
IF ~preample.singletonAttribute THEN {
numberOfAttributeValues _ readInt[];
};
FOR attVal: INT IN [0..numberOfAttributeValues) DO  -- for each attribute value (a field)
fieldName: ROPE _ NIL;
tpeCount: INT _ 1;
valueSet: LIST OF YggRep.TypedPrimitiveElement _ NIL; -- set of values for field
valueSetLast: LIST OF YggRep.TypedPrimitiveElement _ NIL; -- set of values for field
IF ~preample.noFieldNames THEN {
fieldName _ readString[0];  --  read field name
};
IF ~preample.singletonField THEN {
tpeCount _ readInt[];  --  read field name
};
FOR tpeNo: INT IN [0..tpeCount) DO -- for each typed primitive element in the field's value set
fieldValue: YggRep.Bits;
IF preample.typeCode = separate THEN {
fieldDocType _ readInt[];
};
SELECT fieldDocType FROM
YggRep.unknown => EXIT;
YggRep.int => {
i: INT32;
ri: REF INT32;
i _ readInt[];
ri _ NEW[INT32 _ i];
fieldValue _ ri;
};
YggRep.shortRope => {
rRope: ROPE;
rRope _ readString[0];
fieldValue _ rRope;
};
YggRep.rope => {
len: INT;
lenToRead: INT;
charsRead: INT;
rRope: ROPE;
scratch: REF TEXT;
len _ readInt[];
lenToRead _ PBasics.charsPerWord * ((len - 1 + PBasics.charsPerWord)/PBasics.charsPerWord);
scratch _ RefText.ObtainScratch[lenToRead];
TRUSTED {charsRead _ IO.UnsafeGetBlock[attrStream, [LOOPHOLE[scratch, LONG POINTER]+UNITS[TEXT[0]], 0 , lenToRead]];};
IF charsRead # lenToRead THEN ERROR;
scratch.length _ len;
rRope _ Rope.FromRefText[s: scratch, start: 0, len: len];
fieldValue _ rRope;
};
YggRep.float => {
rReal: REF REAL32;
rReal _ NEW[REAL32];
TRUSTED {
charsRead: INT;
ptReal: LONG POINTER TO REAL32;
ptReal _ LOOPHOLE[rReal];
charsRead _ IO.UnsafeGetBlock[attrStream, [LOOPHOLE[ptReal], 0, BYTES[REAL32]]];
IF charsRead # BYTES[REAL32] THEN ERROR;
};
fieldValue _ rReal;
};
YggRep.date => {
rAccurateGMT: YggRep.AccurateGMT;
rAccurateGMT _ NEW[YggRep.AccurateGMTRep];
TRUSTED {
charsRead: INT;
ptAGMT: LONG POINTER TO YggRep.AccurateGMTRep;
ptAGMT _ LOOPHOLE[rAccurateGMT];
charsRead _ IO.UnsafeGetBlock[attrStream, [LOOPHOLE[ptAGMT], 0, YggRep.AccurateGMTRepByteSize]];
IF charsRead # YggRep.AccurateGMTRepByteSize THEN ERROR;
};
fieldValue _ rAccurateGMT;
};
YggRep.did => {
rDID: DID;
rDID _ NEW[DIDRep];
TRUSTED {
charsRead: INT;
ptDID: LONG POINTER TO DIDRep;
ptDID _ LOOPHOLE[rDID];
charsRead _ IO.UnsafeGetBlock[attrStream, [LOOPHOLE[ptDID], 0, BYTES[DIDRep]]];
IF charsRead # BYTES[DIDRep] THEN ERROR;
};
fieldValue _ rDID;
};
ENDCASE => {
charsRead: INT;
junk: REF PACKED ARRAY [0..PBasics.charsPerWord) OF CHAR;
len: INT;
lenToRead: INT;
nullsToRead: INT;
rBits: REF YggRep.BitsRep;
len _ readInt[];
lenToRead _ PBasics.charsPerWord * ((len - 1 + PBasics.charsPerWord)/PBasics.charsPerWord);
rBits _ NEW[YggRep.BitsRep[len]];
rBits.validBytes _ len;
TRUSTED {
ptBits: LONG POINTER TO YggRep.BitsRep;
ptBits _ LOOPHOLE[rBits];
charsRead _ IO.UnsafeGetBlock[attrStream, [LOOPHOLE[ptBits, LONG POINTER] + UNITS[YggRep.BitsRep[0]], 0, len]];
IF charsRead # len THEN ERROR;
};
nullsToRead _ lenToRead - len;
IF nullsToRead > 0 THEN TRUSTED {
junk _ NEW[PACKED ARRAY [0..PBasics.charsPerWord) OF CHAR];
charsRead _ IO.UnsafeGetBlock[attrStream, [LOOPHOLE[junk], 0 , nullsToRead]];
IF charsRead # nullsToRead THEN ERROR;
};
fieldValue _ rBits;
};
IF valueSet = NIL THEN valueSetLast _ valueSet _ CONS[[fieldDocType, fieldValue], NIL]
 ELSE valueSetLast _ (valueSetLast.rest _ CONS[[fieldDocType, fieldValue], NIL]);
IF preample.singletonField THEN EXIT;
ENDLOOP;  -- for each typed primitive element in the field's value set
IF attributeValue = NIL THEN attributeValueLast _ attributeValue _ CONS[[fieldName, valueSet], NIL]
 ELSE attributeValueLast _ (attributeValueLast.rest _ CONS[[fieldName, valueSet], NIL]);
ENDLOOP;  -- for each attribute value
SELECT TRUE FROM
Rope.Compare[YggFixedNames.Contents, attributeName, FALSE] = equal => {
IF attributeValue = NIL THEN ERROR;
IF attributeValue.first.valueSet = NIL THEN ERROR;
IF attributeValue.rest # NIL THEN ERROR;
IF attributeValue.first.valueSet = NIL THEN ERROR;
IF attributeValue.first.valueSet.rest # NIL THEN ERROR;
contentsAttribute _ attributeValue.first.valueSet.first;
};
Rope.Compare[YggFixedNames.Outlinks, attributeName, FALSE] = equal => {
FOR linkList: LIST OF YggRep.AttributeValue _ attributeValue, linkList.rest UNTIL linkList = NIL DO
FOR vS: LIST OF YggRep.TypedPrimitiveElement _ linkList.first.valueSet, vS.rest UNTIL vS = NIL DO
IF vS.first.docType # YggRep.did THEN ERROR;
ENDLOOP;
ENDLOOP;
outlinksAttribute _ attributeValue;
};
Rope.Compare[YggFixedNames.Inlinks, attributeName, FALSE] = equal => {
FOR linkList: LIST OF YggRep.AttributeValue _ attributeValue, linkList.rest UNTIL linkList = NIL DO
FOR vS: LIST OF YggRep.TypedPrimitiveElement _ linkList.first.valueSet, vS.rest UNTIL vS = NIL DO
IF vS.first.docType # YggRep.did THEN ERROR;
ENDLOOP;
ENDLOOP;
inlinksAttribute _ attributeValue;
};
ENDCASE => {
metaAttr: BOOL _ FALSE;
IF ~Rope.IsEmpty[attributeName] AND Rope.Fetch[attributeName, 0] = '$ THEN { -- maybe a meta attribute
SELECT TRUE FROM
Rope.Compare[YggFixedNames.Parents, attributeName, FALSE] = equal => metaAttr _ TRUE;
Rope.Compare[YggFixedNames.Children, attributeName, FALSE] = equal => metaAttr _ TRUE;
Rope.Compare[YggFixedNames.ParentContainers, attributeName, FALSE] = equal => metaAttr _ TRUE;
Rope.Compare[YggFixedNames.ChildContainers, attributeName, FALSE] = equal => metaAttr _ TRUE;
Rope.Compare[YggFixedNames.AutoIndices, attributeName, FALSE] = equal => metaAttr _ TRUE;
ENDCASE;
};
IF metaAttr THEN {
IF metaAttributes = NIL THEN metaAttributeListLast _ metaAttributes _ CONS[[attributeName, preample.ordered, attributeValue], NIL]
 ELSE metaAttributeListLast _ (metaAttributeListLast.rest _ CONS[[attributeName, preample.ordered, attributeValue], NIL]);
}
 ELSE {
IF attributeList = NIL THEN attributeListLast _ attributeList _ CONS[[attributeName, preample.ordered, attributeValue], NIL]
 ELSE attributeListLast _ (attributeListLast.rest _ CONS[[attributeName, preample.ordered, attributeValue], NIL]);
};
};
ENDLOOP;  -- for each attribute
};

contents, attributes, meta: IO.STREAM _ NIL;
contentsDocType: INT _  -1;
doc: YggInternal.Document _ NIL;
componentFiles: LIST OF YggInternal.FileHandle;
effectiveTransID: YggEnvironment.TransID;
vDocs: LIST OF DoubleVDoc _ NIL;

IF ~metaAttributesOnly THEN {
[] _ YggLock.Set[
trans: transID,
lock: YggLock.MakeLockID[did],
mode: lock.mode,
wait: lock.ifConflict=wait
! YggLock.Failed => {		-- Log the error and let the error propagate.
logProc: PROC [YggMonitoringLog.LockConflictInfo];
IF (logProc _ YggMonitoringLog.notice.lockConflict) # NIL THEN
logProc[[
what: why,			-- (conflict or timeout)
where: "YggVolatilizeImpl.VolatizeFromDID",
transID: transID,
mode: lock.mode,
specifics: entireFile[""],
message: ""
]]
}
];
};
IF (vDoc _ LookupDIDInCache[did, transID, lock.mode]) # NIL THEN RETURN;
IF lock.mode = read THEN {
effectiveTransID _ YggEnvironment.nullTransID;
IF (vDoc _ LookupDIDInCache[did, effectiveTransID, lock.mode]) # NIL THEN RETURN;
}
 ELSE effectiveTransID _ transID;
ReserveDIDInCache[did, effectiveTransID];
doc _ YggDIDMap.OpenDocumentFromDID[did, effectiveTransID];
componentFiles _ YggDIDMap.GetComponentFiles[doc];
contents _ YggFileStream.StreamFromComponentFilesAndTid[componentFiles: componentFiles, fileUse: $contents, tid: effectiveTransID, readOnly: TRUE];
attributes _ YggFileStream.StreamFromComponentFilesAndTid[componentFiles: componentFiles, fileUse: $attributes, tid: effectiveTransID, readOnly: TRUE];
meta _ YggFileStream.StreamFromComponentFilesAndTid[componentFiles: componentFiles, fileUse: $meta, tid: effectiveTransID];
[vDoc, vDocs] _ NewVDoc[];
vDoc.did _ did;
vDoc.tid _ effectiveTransID;
IF attributes # NIL THEN {
attributeList: LIST OF YggRep.Attribute _ NIL;
metaAttributes: LIST OF YggRep.Attribute _ NIL;
contentsAttribute: YggRep.TypedPrimitiveElement _ [YggRep.unknown, NIL];
outlinksAttribute: LIST OF YggRep.AttributeValue _ NIL;
inlinksAttribute: LIST OF YggRep.AttributeValue _ NIL;
[attributeList, contentsAttribute, outlinksAttribute, inlinksAttribute, metaAttributes] _ parseAttributes[attributes];
IF contentsAttribute # [YggRep.unknown, NIL] THEN {
IF contents # NIL THEN {
IF IO.GetLength[contents] # 0 THEN ERROR;
};
vDoc.contents _ contentsAttribute;
};
vDoc.attributes _ attributeList;
vDoc.metaAttributes _ metaAttributes;
vDoc.outlinks _ outlinksAttribute;
vDoc.inlinks _ inlinksAttribute;
};
IF meta # NIL THEN {
attributeList: LIST OF YggRep.Attribute _ NIL;
metaAttributes: LIST OF YggRep.Attribute _ NIL;
outlinksAttribute: LIST OF YggRep.AttributeValue _ NIL;
inlinksAttribute: LIST OF YggRep.AttributeValue _ NIL;
contentsAttribute: YggRep.TypedPrimitiveElement _ [YggRep.unknown, NIL];
[attributeList, contentsAttribute, outlinksAttribute, inlinksAttribute, metaAttributes] _ parseAttributes[meta];
IF contentsAttribute # [YggRep.unknown, NIL] THEN ERROR;
vDoc.metaAttributes _ metaAttributes;
IF outlinksAttribute # NIL THEN vDoc.outlinks _ outlinksAttribute;
IF inlinksAttribute # NIL THEN vDoc.inlinks _ inlinksAttribute;
};
IF contents # NIL THEN {  -- contents file exists
IF IO.GetLength[contents] # 0 THEN {  -- contents file has something in it
IF contentsDocType = INT[YggRep.rope] THEN {
newRope: ROPE _ NIL;
newRope _ IO.GetRope[contents, INT.LAST, FALSE];
vDoc.contents _ [contentsDocType, newRope];
}
 ELSE {
bits: REF YggRep.BitsRep;
size: INT;
bytesLeft: INT;
nextByteToRead: INT _ 0;
IF contentsDocType = -1 THEN ERROR;
vDoc.contents.docType _ contentsDocType;
size _ bytesLeft _ IO.GetLength[contents];
vDoc.contents.bits _ bits _ NEW[YggRep.BitsRep[size]];
bits.validBytes _ size;
WHILE bytesLeft > 0 DO
nBytesRead: INT;
unsafeBlock: Basics.UnsafeBlock;
TRUSTED {
firstByte: LONG POINTER;
firstByte _ LOOPHOLE[vDoc.contents.bits, LONG POINTER] + UNITS[YggRep.BitsRep[0]];
unsafeBlock _ [LOOPHOLE[firstByte], nextByteToRead, bytesLeft];
nBytesRead _ IO.UnsafeGetBlock[self: contents, block: unsafeBlock];
};
bytesLeft _ bytesLeft - nBytesRead;
nextByteToRead _ nextByteToRead + nBytesRead;
ENDLOOP;
}
}
 ELSE {  -- contents file is empty
IF vDoc.contents.bits = NIL THEN {  -- didn't find contents in the attributes, so it is a null uninterpreted bytes or rope object
IF contentsDocType = INT[YggRep.rope] THEN vDoc.contents _ [YggRep.rope, EmptyRope]
 ELSE {
newRep: REF YggRep.BitsRep;
newRep _ NEW[YggRep.BitsRep[10]];
newRep.validBytes _ 0;
vDoc.contents _ [contentsDocType, newRep];
};
};
};
};
IF lock.mode # read THEN YggTransaction.NotePossibleDocumentUpdate[transID, vDoc];
CacheDID[did, effectiveTransID, vDoc];
SafeStorage.EnableFinalization[vDoc];
};
LatchVDoc: PUBLIC ENTRY PROC [vDoc: YggRep.VDoc, wait: BOOL _ TRUE] RETURNS [latched: BOOL _ TRUE] ~ {
ENABLE UNWIND => {};
IF vDoc = NIL THEN RETURN[FALSE];
WHILE vDoc.latched DO
IF ~wait THEN RETURN[FALSE];
WAIT latchCondition;
ENDLOOP;
vDoc.latched _ TRUE;
};
UnlatchVDoc: PUBLIC ENTRY PROC [vDoc: YggRep.VDoc] RETURNS [latched: BOOL _ FALSE] ~ {
ENABLE UNWIND => {};
IF vDoc.latched THEN {vDoc.latched _ FALSE; RETURN [TRUE]};
BROADCAST latchCondition;
};
scratchVDocUnderMonitor: YggRep.VDoc _ NEW[YggRep.VDocRep];
scratchCacheEntryUnderMonitor: cacheEntry _ NEW[cacheEntryRep];

LookupDIDInCache: PUBLIC ENTRY PROC [did: DID, transID: YggEnvironment.TransID, mode: YggEnvironment.LockMode] RETURNS [vDoc: YggRep.VDoc _ NIL] ~ {
ENABLE UNWIND => {};
val: REF;
tid: Camelot.tidT _ transID;
DO
transFound: BOOL _ FALSE;
scratchVDocUnderMonitor.did _ did;  -- do this every time due to the WAIT below
scratchVDocUnderMonitor.tid _ tid;
val _ RedBlackTree.Lookup[self: didCache, lookupKey: scratchVDocUnderMonitor];
IF val # NIL THEN {
entry: cacheEntry;
last: LIST OF YggRep.Attribute;
vDoc: YggRep.VDoc _ NIL;
vDocs: LIST OF DoubleVDoc _ NIL;
YggDIDMap.MarkInterestInDID[did];
entry _ NARROW[val];
entry.timeOfLastVolatize _ Now;
IF entry.users # 0 THEN {WAIT myCondition; LOOP;};
entry.vDoc.reissued _ TRUE;
IF mode = read THEN RETURN[entry.vDoc];
IF YggTransaction.EqualTrans[tid, transID] THEN {
IF mode # read THEN YggTransaction.NotePossibleDocumentUpdate[transID, entry.vDoc];
RETURN[entry.vDoc];
};
[vDoc, vDocs] _ NewVDocInternal[];
vDoc.did _ did;
vDoc.tid _ transID;
vDoc.contents _ [YggRep.unknown, NIL];
FOR aL: LIST OF YggRep.Attribute _ entry.vDoc.attributes, aL.rest UNTIL aL = NIL DO
IF vDoc.attributes = NIL THEN last _ vDoc.attributes _ LIST[aL.first]
 ELSE {last.rest _ LIST[aL.first]; last _ last.rest; };
ENDLOOP;
FOR aL: LIST OF YggRep.Attribute _ entry.vDoc.metaAttributes, aL.rest UNTIL aL = NIL DO
IF vDoc.metaAttributes = NIL THEN last _ vDoc.metaAttributes _ LIST[aL.first]
 ELSE {last.rest _ LIST[aL.first]; last _ last.rest; };
ENDLOOP;
vDoc.contents.docType _ entry.vDoc.contents.docType;
SELECT vDoc.contents.docType FROM
YggRep.unknown => ERROR;
YggRep.int => vDoc.contents.bits _ NEW[INT _ NARROW[entry.vDoc.contents.bits, REF INT]^];
YggRep.shortRope, YggRep.rope, YggRep.did => vDoc.contents.bits _ entry.vDoc.contents.bits;
YggRep.float => vDoc.contents.bits _ NEW[REAL32 _ NARROW[entry.vDoc.contents.bits, REF REAL32]^];
YggRep.date => vDoc.contents.bits _ NEW[YggRep.AccurateGMTRep _ NARROW[entry.vDoc.contents.bits, REF YggRep.AccurateGMTRep]^];
YggRep.noValue => vDoc.contents.bits _ NIL;
ENDCASE =>  vDoc.contents.bits _ YggRep.BitsFromBits[entry.vDoc.contents.bits];
scratchVDocUnderMonitor.tid _ transID;
RedBlackTree.Insert[self: didCache, insertKey: scratchVDocUnderMonitor, dataToInsert: NEW[cacheEntryRep _ [0, Now, vDoc]]];
IF mode # read THEN YggTransaction.NotePossibleDocumentUpdate[transID, vDoc];
SafeStorage.EnableFinalization[vDoc];
RETURN[vDoc];
};
IF YggTransaction.IsNullTrans[tid] THEN EXIT;
[transFound, tid] _ YggTransaction.GetParent[tid];
IF ~transFound THEN ERROR;
ENDLOOP;
};
ReserveDIDInCache: PUBLIC ENTRY PROC [did: DID, transID: YggEnvironment.TransID] ~ {
ENABLE UNWIND => {};
val: REF;
scratchVDocUnderMonitor.did _ did;
scratchVDocUnderMonitor.tid _ transID;
val _ RedBlackTree.Lookup[self: didCache, lookupKey: scratchVDocUnderMonitor];
IF val # NIL THEN {
entry: cacheEntry;
entry _ NARROW[val];
WHILE entry.users # 0 DO WAIT myCondition; ENDLOOP;
entry.users _ 1;
}
 ELSE {
vDoc: YggRep.VDoc;
vDocs: LIST OF DoubleVDoc;
[vDoc, vDocs] _ NewVDocInternal[];
vDoc.did _ did;
vDoc.tid _ transID;
RedBlackTree.Insert[self: didCache, insertKey: scratchVDocUnderMonitor, dataToInsert: NEW[cacheEntryRep _ [1, Now, vDoc]]];
};
};
UnreserveDIDInCache: PUBLIC ENTRY PROC [did: DID, transID: YggEnvironment.TransID] ~ {
ENABLE UNWIND => {};
val: REF;
scratchVDocUnderMonitor.did _ did;
scratchVDocUnderMonitor.tid _ transID;
val _ RedBlackTree.Lookup[self: didCache, lookupKey: scratchVDocUnderMonitor];
IF val # NIL THEN {
entry: cacheEntry;
entry _ NARROW[val];
entry.users _ entry.users - 1;
entry.timeOfLastVolatize _ Now;
BROADCAST myCondition;
}
 ELSE ERROR;
};
CacheDID: PUBLIC ENTRY PROC [did: DID, transID: YggEnvironment.TransID, vDoc: YggRep.VDoc] ~ {
ENABLE UNWIND => {};
val: REF;
scratchVDocUnderMonitor.did _ did;
scratchVDocUnderMonitor.tid _ transID;
val _ RedBlackTree.Lookup[self: didCache, lookupKey: scratchVDocUnderMonitor];
IF val # NIL THEN {
entry: cacheEntry;
entry _ NARROW[val];
VDocsAllocList _ CONS[[entry.vDoc, entry.vDoc], VDocsAllocList];
entry.vDoc _ vDoc;
entry.users _ 0;
entry.timeOfLastVolatize _ Now;
BROADCAST myCondition;
}
 ELSE {
RedBlackTree.Insert[self: didCache, insertKey: vDoc, dataToInsert: NEW[cacheEntryRep _ [0, Now, vDoc]]];
};
};
InvalidateDID: PUBLIC ENTRY PROC [did: DID, transID: YggEnvironment.TransID] ~ {
ENABLE UNWIND => {};
val: REF;
scratchVDocUnderMonitor.did _ did;
scratchVDocUnderMonitor.tid _ transID;
val _ RedBlackTree.Lookup[self: didCache, lookupKey: scratchVDocUnderMonitor];
IF val # NIL THEN {
entry: cacheEntry;
entry _ NARROW[val];
WHILE entry.users # 0 DO WAIT myCondition; ENDLOOP;
scratchVDocUnderMonitor.did _ did;  -- WAIT may have changed did/tid
scratchVDocUnderMonitor.tid _ transID;
RedBlackTreeDelete[deleteKey: scratchVDocUnderMonitor];
};
};
PromoteToParent: PUBLIC ENTRY PROC [did: YggDID.DID, transID: YggEnvironment.TransID] ~ {
ENABLE UNWIND => {};
val: REF;
parentVal: REF;
transFound: BOOL _ FALSE;
parentTid: YggEnvironment.TransID;
scratchVDocUnderMonitor.did _ did;
scratchVDocUnderMonitor.tid _ transID;
val _ RedBlackTree.Lookup[self: didCache, lookupKey: scratchVDocUnderMonitor];
IF val # NIL THEN {
entry: cacheEntry;
entry _ NARROW[val];
[transFound, parentTid] _ YggTransaction.GetParent[transID];
IF ~transFound THEN ERROR;
scratchVDocUnderMonitor.tid _ parentTid;
parentVal _ RedBlackTree.Lookup[self: didCache, lookupKey: scratchVDocUnderMonitor];
IF parentVal # NIL THEN {
deletedNode: RedBlackTree.Node _ NIL;
parentEntry: cacheEntry;
parentEntry _ NARROW[parentVal];
scratchCacheEntryUnderMonitor.vDoc _ parentEntry.vDoc; -- remember old vDoc
scratchVDocUnderMonitor.tid _ transID;
deletedNode _ RedBlackTree.Delete[self: didCache, deleteKey: scratchVDocUnderMonitor];  -- delete child
IF deletedNode = NIL THEN ERROR;
IF entry.vDoc.destroyed THEN {
scratchVDocUnderMonitor.tid _ parentTid;
parentVal _ RedBlackTree.Delete[self: didCache, deleteKey: scratchVDocUnderMonitor];  -- delete parent
VDocsAllocList _ CONS[[entry.vDoc, entry.vDoc], VDocsAllocList];
}
 ELSE {
parentEntry.vDoc _ entry.vDoc;
parentEntry.vDoc.tid _ parentTid;
};
VDocsAllocList _ CONS[[scratchCacheEntryUnderMonitor.vDoc, scratchCacheEntryUnderMonitor.vDoc], VDocsAllocList];
IF entry.vDoc.metaAttributesChanged # NIL THEN {
IF parentEntry.vDoc.metaAttributesChanged = NIL THEN parentEntry.vDoc.metaAttributesChanged _ entry.vDoc.metaAttributesChanged
ELSE {
last: LIST OF YggRep.metaAttributeMod _ NIL;
FOR lomam: LIST OF YggRep.metaAttributeMod _ parentEntry.vDoc.metaAttributesChanged, lomam.rest UNTIL lomam = NIL DO
last _ lomam;
ENDLOOP;
last.rest _ entry.vDoc.metaAttributesChanged;
};
};
}
 ELSE { -- no parent
node: RedBlackTree.Node;
parentEntry: cacheEntry;
scratchVDocUnderMonitor.tid _ transID;
node _ RedBlackTree.Delete[self: didCache, deleteKey: scratchVDocUnderMonitor];
IF node = NIL THEN ERROR;
parentEntry _ NARROW[node.data];
parentEntry.vDoc.tid _ parentTid;
scratchVDocUnderMonitor.tid _ parentTid;
RedBlackTree.InsertNode[self: didCache, nodeToInsert: node, insertKey: scratchVDocUnderMonitor];
};
};
};

SetSizeOfDIDCache: PUBLIC ENTRY PROC [size: INT] = {
ENABLE UNWIND => {};
desiredSizeOfDIDCache _ size;
};
TickerProcess: PROC = {
ticksToWait: Process.Ticks;
ticksToWait _ Process.MsecToTicks[1123];
DO
Process.Pause[ticksToWait];
Now _ BasicTime.Now[];
ENDLOOP;

};
DIDCacheTrimProcess: PROC = {
ticksToWait: Process.Ticks;
lastVDoc: YggRep.VDoc _ NIL;
threshold: BasicTime.GMT _ BasicTime.Now[];
ticksToWait _ Process.MsecToTicks[293];
DO
innerTrim: ENTRY PROC = {
ENABLE UNWIND => {};
minGMT: BasicTime.GMT _ threshold;
minPeriod: INT _ LAST[INT];
loopCount: INT _ 0;
size: INT;
size _ RedBlackTree.Size[didCache];
FOR vdl: LIST OF YggRep.VDoc _ ListOfFinalizedVDocs, vdl.rest UNTIL vdl = NIL DO
IF loopCount >= 10 THEN {loopCount _ 0; WAIT aTickCondition};
loopCount _ loopCount + 1;
IF vdl.first.reissued THEN {
vdl.first.reissued _ FALSE;
SafeStorage.EnableFinalization[vdl.first];
}
 ELSE {
data: RedBlackTree.UserData;
ce: cacheEntry;
data _ RedBlackTree.Lookup[didCache, vdl.first];
IF data # NIL THEN {
ce _ NARROW[data];
IF ce.users = 0 THEN {
period: INT;
IF (period _ BasicTime.Period[from: threshold, to: ce.timeOfLastVolatize]) <= 0 THEN {
[] _ RedBlackTree.Delete[self: didCache, deleteKey: vdl.first];
size _ size -1;
}
 ELSE {
IF period < minPeriod THEN {
minGMT _ ce.timeOfLastVolatize;
minPeriod _ period;
};
};
};
};
};
ListOfFinalizedVDocs _ vdl.rest;
IF size <= desiredSizeOfDIDCache THEN EXIT;
ENDLOOP;
IF size >= desiredSizeOfDIDCache THEN threshold _ BasicTime.Update[minGMT, 2];
};
Process.Pause[ticksToWait];
IF RedBlackTree.Size[didCache] > desiredSizeOfDIDCache THEN innerTrim[];
ENDLOOP;
};
RedBlackTreeDelete: INTERNAL PROC [deleteKey: REF] ~ {
deletedNode: RedBlackTree.Node _ NIL;
deletedNode _ RedBlackTree.Delete[self: didCache, deleteKey: deleteKey];
IF deletedNode # NIL THEN {
entry: cacheEntry;
entry _ NARROW[deletedNode.data];
VDocsAllocList _ CONS[[entry.vDoc, entry.vDoc], VDocsAllocList];
};
};

GetKeyProc: RedBlackTree.GetKey  = {  
entry: cacheEntry _ NARROW[data];
RETURN[ entry.vDoc ];
};

CompareProc: RedBlackTree.Compare = {
entryData: cacheEntry _ NARROW[data];
keyData: YggRep.VDoc _ NARROW[k];
SELECT keyData.did.didHigh FROM
> entryData.vDoc.did.didHigh => RETURN [greater];
< entryData.vDoc.did.didHigh => RETURN [less];
ENDCASE => {
SELECT keyData.did.didLow FROM
> entryData.vDoc.did.didLow => RETURN [greater];
< entryData.vDoc.did.didLow => RETURN [less];
ENDCASE => {
SELECT keyData.tid.top.nodeId.value FROM
> entryData.vDoc.tid.top.nodeId.value => RETURN [greater];
< entryData.vDoc.tid.top.nodeId.value => RETURN [less];
ENDCASE => {
SELECT keyData.tid.top.highTicker FROM
> entryData.vDoc.tid.top.highTicker => RETURN [greater];
< entryData.vDoc.tid.top.highTicker => RETURN [less];
ENDCASE => {
SELECT keyData.tid.top.lowTicker FROM
> entryData.vDoc.tid.top.lowTicker => RETURN [greater];
< entryData.vDoc.tid.top.lowTicker => RETURN [less];
ENDCASE => RETURN [equal];
};
};
};
};
};
NewVDocInternal: INTERNAL PROC RETURNS [vDoc: YggRep.VDoc _ NIL, vDocs: LIST OF DoubleVDoc _ NIL] = {
IF VDocsAllocList = NIL THEN {
vDoc _ NEW[YggRep.VDocRep];
RETURN;
}
 ELSE {
vDocs _ VDocsAllocList;
vDoc _ VDocsAllocList.first.aOne;
VDocsAllocList _ VDocsAllocList.rest;
vDocs.rest _ NIL;
vDoc.reissued _ TRUE;  -- Better safe than in 815
vDoc.latched _ FALSE;
vDoc.fromDID _ YggEnvironment.nullDID;
vDoc.toDID _ YggEnvironment.nullDID;
vDoc.linkType _ NIL;
vDoc.linkChanged _ FALSE;
vDoc.destroyed _ FALSE;
vDoc.contents _ [YggRep.unknown, NIL];
vDoc.contentsChanged _ FALSE;
vDoc.outlinks _ NIL;
vDoc.outlinksChanged _ NIL;
vDoc.inlinks _ NIL;
vDoc.inlinksChanged _ NIL;
vDoc.attributes _ NIL;
vDoc.namesOfAttributesChanged _ NIL;
vDoc.attributesChanged _ NIL;
vDoc.metaAttributes _ NIL;
vDoc.metaAttributesChanged _ NIL;
};
};

NewVDoc: PROC RETURNS [vDoc: YggRep.VDoc _ NIL, vDocs: LIST OF DoubleVDoc _ NIL] = {
beCareful: ENTRY PROC = {
ENABLE UNWIND => {};
[vDoc, vDocs] _ NewVDocInternal[];
};
IF VDocsAllocList = NIL THEN RETURN [vDoc: NEW[YggRep.VDocRep]];
beCareful[];
};
VDocFinalizationProcess: PROC = {
DO
innerVDocFinalizationProcess: ENTRY PROC [] = {
IF vDoc.reissued THEN {
vDoc.reissued _ FALSE;
SafeStorage.EnableFinalization[vDoc];
}
 ELSE {
IF ListOfFinalizedVDocs = NIL THEN ListOfFinalizedVDocsLast _ ListOfFinalizedVDocs _ LIST[vDoc]
 ELSE ListOfFinalizedVDocsLast _ (ListOfFinalizedVDocsLast.rest _ LIST[vDoc]);
};
};
vDoc: YggRep.VDoc _ NIL;
vDoc _ NARROW[SafeStorage.FQNext[MyQueue]];
innerVDocFinalizationProcess[];
vDoc _ NIL;
ENDLOOP;
};

didCache _ RedBlackTree.Create[getKey: GetKeyProc, compare: CompareProc];
TRUSTED {
mcp: LONG POINTER TO CONDITION _ @myCondition;
Process.Detach[FORK DIDCacheTrimProcess];
Process.Detach[FORK TickerProcess];
Process.SetTimeout[condition: mcp, ticks: Process.MsecToTicks[157]];
mcp _ @latchCondition;
Process.SetTimeout[condition: mcp, ticks: Process.MsecToTicks[250]];
mcp _ @aTickCondition;
Process.SetTimeout[condition: mcp, ticks: 1];
SafeStorage.EstablishFinalization[type: CODE[YggRep.VDocRep], npr: 1, fq: MyQueue  ! SafeStorage.CantEstablishFinalization => CONTINUE;];
Process.Detach[FORK VDocFinalizationProcess[] ];
};

END.
พYggVolatilizeImpl.mesa
Copyright ำ 1988, 1989 by Xerox Corporation.  All rights reserved.
Bob Hagmann March 21, 1989 10:32:18 am PST

This module converts documents from stable to volatile forms.

Exported conversion procedures
Given a DID, return the volatile form of the document it refers to.  If metaAttributesOnly is TRUE, then the transID must be null.
read an int from the attributes stream
read a null terminated string from the attributes stream
Check to be sure that the value is a singleton value of a singleton set
Make sure the list of links is all to DID's, and build up the outlinks value
Make sure the list of links is all to DID's, and build up the inlinks value
IF contents # NIL THEN {
IF IO.GetLength[contents] <= 0 THEN SIGNAL itsZero;
};
IF attributes # NIL THEN {
IF IO.GetLength[attributes] <= 0 THEN SIGNAL itsZero;
};
IF size <= 0 THEN SIGNAL itsZero;
IF vDoc.contents.docType # YggRep.unknown AND vDoc.contents.bits = NIL THEN SIGNAL itsZero;

itsZero: SIGNAL = CODE;

Cache management utilities
Set a short term latch.


Remove a short term latch.

Given a DID, transaction, and lock mode, return the volatile form of the document if it is cached.  If the object is reserved, block until this is over.
For readers, the VDoc for this transaction or the nearest parent transaction is returned (or for the null transaction).
For writers, the cached VDoc must match both the did and tid.  If any object with the proper did exists, a new object is constructed with the did and tid from a deep copy of the nearest parent transaction.  Otherwise, NIL is returned.
copy attributes
copy meta attributes


Given a DID and a transaction, reserve this DID as being volatized.  Calling this procedure obligates the caller to call CacheDID to clear the reservation.
RedBlackTree.Insert[self: didCache, insertKey: scratchVDocUnderMonitor, dataToInsert: NEW[cacheEntryRep _ [1, Now, NEW[YggRep.VDocRep _ [did: did, tid: transID]]]]];


Undo a reservation.


Add this document to the cache for the did.
IF SafeStorage.IsFinalizationEnabled[entry.vDoc] THEN ERROR;


Remove this did from the cache.

IF deletedNode # NIL THEN {
deletedEntry: cacheEntry;
deletedEntry _ NARROW[deletedNode.data];
IF SafeStorage.IsFinalizationEnabled[scratchCacheEntryUnderMonitor.vDoc] THEN {
IF scratchCacheEntryUnderMonitor.vDoc (i. e., the old parent) is finalizable, dropping it out of the table will lead to a ZCT disaster.  Hence, reinsert it into the table after making it bogus (this is the delCount game).  It will be trimmed out of the cache after finalization.
keepGoing: BOOL _ TRUE;
deletedEntry.vDoc _ scratchCacheEntryUnderMonitor.vDoc;
deletedEntry.vDoc.delCount _ 1;
deletedEntry.vDoc.reissued _ FALSE;
WHILE keepGoing DO
keepGoing _ FALSE;
RedBlackTree.Insert[self: didCache, insertKey: deletedEntry.vDoc, dataToInsert: deletedEntry ! RedBlackTree.DuplicateKey => {
keepGoing _ TRUE;
deletedEntry.vDoc.delCount _ deletedEntry.vDoc.delCount + 1;
CONTINUE}
 ];
ENDLOOP;
};
} ELSE ERROR;
Remove this did from the cache.

Cache trim
Internal red black procs
IF SafeStorage.IsFinalizationEnabled[entry.vDoc] THEN {
keepGoing: BOOL _ TRUE;
entry.vDoc.delCount _ 1;
entry.vDoc.reissued _ FALSE;
WHILE keepGoing DO
keepGoing _ FALSE;
RedBlackTree.Insert[self: didCache, insertKey: entry.vDoc, dataToInsert: entry ! RedBlackTree.DuplicateKey => {
keepGoing _ TRUE;
entry.vDoc.delCount _ entry.vDoc.delCount + 1;
CONTINUE}
 ];
ENDLOOP;
};
PROC [data: UserData] RETURNS [Key]
PROC [k: Key, data: UserData] RETURNS [Basics.Comparison]
Allocate VDoc
Return both the VDoc and possibly the list.  The caller is responsible for holding on to the LIST until the VDoc is safely put into the red/black tree.  If he doesn't do this, ZCT disaster!

Finalization
Initialization


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