[Indigo]<Alpine>Release52>Exports>AlpineEnvironment.mesa!1

AlpineEnvironment.mesa

Common definitions for public Alpine interfaces

Last edited by:

MBrown on February 1, 1984 5:04:15 pm PST

Kolling on October 28, 1983 12:32 pm

Taft on April 8, 1983 5:02 pm

DIRECTORY

Basics USING [bytesPerWord, logBytesPerWord],

BasicTime USING [GMT],

File USING [FP, nullFP, nullVolumeID, PageCount, VolumeID, wordsPerPage],

Rope USING [ROPE],

RPC USING [Conversation, Principal, ShortROPE];

AlpineEnvironment: DEFINITIONS =

BEGIN

Identification and authentication (see RPC.mesa and Lupine documentation for details)

Principal: TYPE = RPC.Principal; -- a Grapevine individual

FileStore: TYPE = Principal; -- an Alpine instance

RName: TYPE = RPC.ShortROPE; -- an arbitrary Grapevine RName

OwnerName: TYPE = RPC.ShortROPE; -- an Alpine owner, not necessarily an RName

AccessList: TYPE = LIST OF RName;

Conversation: TYPE = RPC.Conversation;

File system

VolOrVolGroupID: TYPE = File.VolumeID;

VolumeID: TYPE = RECORD [VolOrVolGroupID];

VolumeGroupID: TYPE = RECORD [VolOrVolGroupID];

nullVolumeID: VolumeID = [File.nullVolumeID]; -- the ID of no volume

nullVolumeGroupID: VolumeGroupID = [File.nullVolumeID]; -- the ID of no volume group

FileID: TYPE = File.FP; -- volume-relative ID of a file

nullFileID: FileID = File.nullFP; -- the ID of no file

UniversalFile: TYPE = RECORD [ -- globally permanently unique identification of a file

volumeID: VolumeID,

fileID: FileID];

nullUniversalFile: UniversalFile = [volumeID: nullVolumeID, fileID: nullFileID];

PageNumber: TYPE = INT; -- should be [0..maxPagesPerFile]

PageCount: TYPE = INT;

PageRun: TYPE = RECORD [

firstPage: PageNumber,

count: CARDINAL ← 1];

maxPagesPerFile: INT = File.PageCount.LAST;

wordsPerPage: CARDINAL = File.wordsPerPage;

bytesPerPage: CARDINAL = wordsPerPage * Basics.bytesPerWord;

logWordsPerPage: CARDINAL = 8; -- ugh!

logBytesPerPage: CARDINAL = logWordsPerPage + Basics.logBytesPerWord;

File properties

Property: TYPE = {byteLength, createTime, highWaterMark, modifyAccess, owner, readAccess, stringName, version};

PropertyValuePair: TYPE = RECORD [

SELECT property: Property FROM

byteLength => [byteLength: ByteCount],

createTime => [createTime: BasicTime.GMT],

highWaterMark => [highWaterMark: PageCount],

modifyAccess => [modifyAccess: AccessList],

owner => [owner: OwnerName],

readAccess => [readAccess: AccessList],

stringName => [stringName: Rope.ROPE],

version => [version: FileVersion],

ENDCASE] ← [byteLength[0]]; -- default value to make Lupine happy

ByteCount: TYPE = INT;

maxStringNameChars: CARDINAL = 100; -- max length of any string appearing in a property

FileVersion: TYPE = INT;

File access

OpenFileID: TYPE [2]; -- represents a single client's access to a single file under a single transaction. Unique only within a single Alpine instance.

nullOpenFileID: OpenFileID = LOOPHOLE[LONG[0]]; -- ID of no open file

AccessRights: TYPE = {readOnly, readWrite};

LockMode: TYPE = {none, read, update, write, readIntendUpdate, readIntendWrite, intendRead, intendUpdate, intendWrite};

LockOption: TYPE = RECORD [

mode: LockMode,

ifConflict: {wait, fail}];

RecoveryOption: TYPE = {log, noLog};

ReferencePattern: TYPE = {random, sequential}; -- a client-supplied hint about the expected pattern of references to pages of a file. Sequential means that when the client reads or writes an interval [p .. p+n) of the file, there is a high likelihood that it will reference pages [p+n .. p+2*n) in the near future. Random means that no such pattern is expected. Specifying this hint accurately enables the server to perform the operations more quickly and efficiently.

Owner properties

OwnerProperty: TYPE = {createAccessList, modifyAccessList, quota, spaceInUse, rootFile};

OwnerPropertyValuePair: TYPE = RECORD [

SELECT property: OwnerProperty FROM

createAccessList => [createAccessList: AccessList],

modifyAccessList => [modifyAccessList: AccessList],

quota => [quota: PageCount],

rootFile => [rootFile: UniversalFile],

--readOnly-- spaceInUse => [spaceInUse: PageCount],

ENDCASE] ← [createAccessList[NIL]]; -- default value to make Lupine happy

nullRootFile: UniversalFile = [nullVolumeID, nullFileID];

OwnerPropertySet: TYPE = PACKED ARRAY OwnerProperty OF FalseBool;

FalseBool: TYPE = BOOLEAN ← FALSE;

allOwnerProperties: OwnerPropertySet = ALL [TRUE];

Transactions

TransID: TYPE [9]; -- globally permanently unique capability for a transaction

nullTransIDRep: ARRAY [0..SIZE[TransID]) OF UNSPECIFIED = [0,0,0,0,0,0,0,0,0];

nullTransID: TransID = LOOPHOLE[nullTransIDRep]; -- ID of no transaction

Outcome: TYPE = {abort, commit, unknown};

CommitOrAbort: TYPE = Outcome [abort .. commit];

WorkerState: TYPE = {notReady, readOnlyReady, ready};

Error enumerations

NeededAccess: TYPE = {alpineWheel, fileModify, fileRead, handleReadWrite, ownerCreate, ownerEntry, spaceQuota}; -- when access is denied, indicates the access control list in which client's membership was required but not present

OperationFailure: TYPE = {

busy, -- server is too busy to start another transaction

damagedLeaderPage, -- file properties are messed up (probable Alpine bug)

duplicateOwner,

duplicateVolumeGroup,

duplicateVolume,

inconsistentDescriptor, -- PageBuffer word count and PageRun page count are inconsistent

volumeFragmented, -- cannot find enough contiguous pages to create or extend file

insufficientSpace, -- in volume group to create or extend file, or in leader page to write property

nonexistentFilePage, -- attempted to access page beyond last page of file

notAlpineWheel, -- failure from AssertAlpineWheel

ownerDatabaseFull,

ownerFileFormatOrVolGroupMismatch,

ownerRecordFull,

ownerRecordInUse,

quotaExceeded, -- attempt to create or extend file would exceed owner's quota

regServersUnavailable, -- access check failed due to Grapevine unavailability

spaceInUseByThisOwner,

tooManyRNames,

totalQuotaExceeded,

unwritableProperty}; -- attempted to write the version property with WriteProperties

LockFailure: TYPE = {

conflict, -- lock cannot immediately be set because a conflicting lock is already set by another transaction

timeout}; -- lock cannot be set even after waiting a long time, perhaps due to undetected deadlock

UnknownType: TYPE = {

coordinator, -- coordinator RName not known to Grapevine (CreateWorker)

fileID, -- no file with this ID in specified volume

openFileID, -- no open file with this ID, or ID presented from wrong conversation

owner, -- no owner with this name in owner data base for specified volume group

transID, -- no transaction active with this ID on this Alpine instance. It may be that the transaction has aborted or that the server has crashed and restarted.

volumeID, -- no volume with this ID is on-line

volumeGroupID}; -- no volume group with this ID is on-line

Obsolete definition

String: TYPE = Rope.ROPE;

END.