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827 lines
23 KiB
827 lines
23 KiB
/*
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* token.h
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*
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* Copyright (c) 1993 - 1995 by DataBeam Corporation, Lexington, KY
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*
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* Abstract:
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* This is the interface file for the Token class. Objects of this class
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* represent tokens in the MCS environment. Whenever a token is allocated
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* by a user, one of these objects is created. Its job is to handle all
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* requests that are specific to the token ID with which it is associated.
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*
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* Tokens in the MCS environment are used for critical resource management.
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* The exact use of tokens is up to the user applications attaching to
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* MCS. They are provided as a generic resource.
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*
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* Tokens can be "owned" by one or more users. There are two types of
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* ownership. There is exclusive ownership, where only one user can
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* own the token at a time. That user has "grabbed" the token. And there
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* is non-exclusive ownership, where several users can own the token at
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* the same time. Those users have "inhibited" the token. It is not
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* possible to mix exclusive and non-exclusive ownership.
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*
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* If a user has grabbed a token, that same user can inhibit the token,
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* thus converting to non-exclusive ownership. Similarly, if a user is
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* the sole inhibitor of a token, that user can grab the token, thus
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* converting to exclusive ownership.
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*
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* During a domain merge operation, it is necessary to merge tokens upward
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* to the new Top Provider of the enlarged domain. This class also defines
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* a member function allowing it to be told to issue a merge request with
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* all of its state contained therein.
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*
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* Caveats:
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* None.
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*
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* Author:
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* James P. Galvin, Jr.
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*/
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#ifndef _TOKEN_
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#define _TOKEN_
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/*
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* This is the class definition for the Token class.
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*/
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class Token
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{
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public:
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Token (
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TokenID token_id,
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PDomain local_provider,
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PConnection top_provider,
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CChannelList2 *channel_list,
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CAttachmentList *attachment_list);
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Token (
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TokenID token_id,
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PDomain local_provider,
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PConnection top_provider,
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CChannelList2 *channel_list,
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CAttachmentList *attachment_list,
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TokenState token_state,
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UserID grabber,
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CUidList *inhibitor_list,
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UserID recipient);
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~Token ();
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void SetTopProvider(PConnection top_provider) { m_pConnToTopProvider = top_provider; }
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BOOL IsTopProvider(void) { return (m_pConnToTopProvider == NULL); }
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TokenState GetTokenState () { return (Token_State); };
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BOOL IsValid ();
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Void IssueMergeRequest ();
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Void TokenGrabRequest (
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CAttachment *originator,
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UserID uidInitiator,
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TokenID token_id);
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Void TokenGrabConfirm (
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Result result,
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UserID uidInitiator,
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TokenID token_id,
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TokenStatus token_status);
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Void TokenInhibitRequest (
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CAttachment *originator,
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UserID uidInitiator,
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TokenID token_id);
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Void TokenInhibitConfirm (
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Result result,
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UserID uidInitiator,
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TokenID token_id,
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TokenStatus token_status);
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Void TokenGiveRequest (
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CAttachment *originator,
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PTokenGiveRecord pTokenGiveRec);
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Void TokenGiveIndication (
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PTokenGiveRecord pTokenGiveRec);
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Void TokenGiveResponse (
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Result result,
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UserID receiver_id,
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TokenID token_id);
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Void TokenGiveConfirm (
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Result result,
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UserID uidInitiator,
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TokenID token_id,
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TokenStatus token_status);
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Void TokenPleaseRequest (
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UserID uidInitiator,
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TokenID token_id);
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Void TokenPleaseIndication (
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UserID uidInitiator,
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TokenID token_id);
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Void TokenReleaseRequest (
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CAttachment *originator,
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UserID uidInitiator,
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TokenID token_id);
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Void TokenReleaseConfirm (
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Result result,
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UserID uidInitiator,
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TokenID token_id,
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TokenStatus token_status);
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Void TokenTestRequest (
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CAttachment *originator,
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UserID uidInitiator,
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TokenID token_id);
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Void TokenTestConfirm (
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UserID uidInitiator,
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TokenID token_id,
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TokenStatus token_status);
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private:
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BOOL ValidateUserID (
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UserID user_id);
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CAttachment *GetUserAttachment (
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UserID user_id);
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Void IssueTokenReleaseIndication (
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UserID user_id);
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Void BuildAttachmentList (
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CUidList *user_id_list,
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CAttachmentList *attachment_list);
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TokenID Token_ID;
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PDomain m_pDomain;
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PConnection m_pConnToTopProvider;
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CChannelList2 *m_pChannelList2;
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CAttachmentList *m_pAttachmentList;
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TokenState Token_State;
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UserID m_uidGrabber;
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CUidList m_InhibitorList;
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UserID m_uidRecipient;
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};
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/*
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* Token (
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* TokenID token_id,
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* PDomain local_provider,
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* PConnection top_provider,
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* PChannelList channel_list,
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* PAttachmentList attachment_list)
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*
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* Functional Description:
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* This is the constructor for the Token class. It simply initializes
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* local instance variables with the passed in values. It also marks
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* the state of the token as available.
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*
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* Formal Parameters:
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* token_id (i)
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* This is the token ID that this token object is associated with.
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* local_provider (i)
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* This is a pointer to the local provider. A Token object will
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* never actually send a command to the local provider, but it needs
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* this value to use a parameter when it sends commands to various
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* attachments (since it is doing so on behalf of the local provider).
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* top_provider (i)
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* This is a pointer to the top provider. This is used by the
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* Token object when it needs to issue a request to the Top
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* Provider.
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* channel_list (i)
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* This is a pointer to the domain's channel list, which identifies
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* all valid channels in the domain. This is used by token objects
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* to validate user IDs.
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* attachment_list (i)
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* This is a pointer to the domain's attachment list, which identifies
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* all valid attachments in the domain. This is used by token
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* objects to validate joined attachments.
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*
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* Return Value:
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* None.
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*
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* Side Effects:
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* None.
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*
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* Caveats:
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* None.
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*/
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/*
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* Token (
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* TokenID token_id,
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* PDomain local_provider,
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* PConnection top_provider,
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* PChannelList channel_list,
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* PAttachmentList attachment_list,
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* TokenState token_state,
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* UserID grabber,
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* CUidList *inhibitor_list,
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* UserID recipient)
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*
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* Functional Description:
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* This is the constructor for the Token class. It simply initializes
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* local instance variables with the passed in values. It also marks
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* the state of the token as available.
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*
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* Formal Parameters:
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* token_id (i)
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* This is the token ID that this token object is associated with.
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* local_provider (i)
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* This is a pointer to the local provider. A Token object will
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* never actually send a command to the local provider, but it needs
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* this value to use a parameter when it sends commands to various
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* attachments (since it is doing so on behalf of the local provider).
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* top_provider (i)
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* This is a pointer to the top provider. This is used by the
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* Token object when it needs to issue a request to the Top
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* Provider.
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* channel_list (i)
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* This is a pointer to the domain's channel list, which identifies
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* all valid channels in the domain. This is used by token objects
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* to validate user IDs.
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* attachment_list (i)
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* This is a pointer to the domain's attachment list, which identifies
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* all valid attachments in the domain. This is used by token
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* objects to validate joined attachments.
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* token_state (i)
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* This is the state of the token being merged.
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* grabber (i)
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* This is the user ID of the user who has the token grabbed (this is
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* only valid if the token state is grabbed or giving).
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* inhibitor_list (i)
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* This is a list of the users who have the token inhibited (this is
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* only valid if the token state is inhibited).
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* recipient (i)
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* This is the user ID of the user who is being offered the token
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* as part of a give operation (this is only valid if the token state
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* is giving or given).
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*
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* Return Value:
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* None.
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*
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* Side Effects:
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* None.
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*
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* Caveats:
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* None.
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*/
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/*
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* ~Token ()
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*
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* Functional Description:
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* This is a virtual destructor defined for the Token class. It does
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* nothing at this time.
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*
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* Formal Parameters:
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* None.
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*
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* Return Value:
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* None.
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*
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* Side Effects:
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* None.
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*
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* Caveats:
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* None.
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*/
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/*
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* Void SetTopProvider (
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* PConnection top_provider)
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*
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* Functional Description:
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* This member function is used to change the identity of the Top Provider
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* in an existing token. The only time this will really occur is when
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* a provider that used to be the Top Provider merges into another
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* domain, and therefore ceases to be the Top Provider. When the merge
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* operation has been successfully completed, this function allows the
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* domain to inform all of its Token objects about the identity of
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* the new Top Provider.
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*
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* Formal Parameters:
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* top_provider (i)
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* This is a pointer to the new Top Provider.
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*
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* Return Value:
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* None.
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*
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* Side Effects:
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* None.
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*
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* Caveats:
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* None.
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*/
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/*
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* TokenState GetTokenState ()
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*
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* Functional Description:
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* This function returns the current state of the token. This is used
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* by the caller primarily during a merge operation, when decisions have
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* to made about what tokens can and cannot be merged.
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*
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* Formal Parameters:
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* None.
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*
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* Return Value:
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* TOKEN_AVAILABLE if the token is not in use.
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* TOKEN_GRABBED if the token is currently grabbed.
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* TOKEN_INHIBITED if the token is currently inhiited.
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* TOKEN_GIVING if the token is currently in the giving state.
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* TOKEN_GIVEN if the token is currently in the given state.
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*
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* Side Effects:
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* None.
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*
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* Caveats:
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* None.
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*/
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/*
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* BOOL IsValid ()
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*
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* Functional Description:
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* This function returns TRUE if the token is still valid, or FALSE if the
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* token needs to be deleted. A token is valid if it has ANY owners
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* (grabbers, inhibitors, or recipient).
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*
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* Formal Parameters:
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* None.
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*
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* Return Value:
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* TRUE if the token is valid.
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* FALSE if the token needs to be deleted.
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*
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* Side Effects:
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* None.
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*
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* Caveats:
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* None.
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*/
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/*
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* Void IssueMergeRequest ()
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*
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* Functional Description:
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* This function is called during a domain merge operation. It causes
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* the token object to pack it state and send it out in a merge token
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* request to the top provider.
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*
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* Formal Parameters:
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* None.
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*
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* Return Value:
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* None.
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*
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* Side Effects:
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* None.
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*
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* Caveats:
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* None.
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*/
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/*
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* Void TokenGrabRequest (
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* PCommandTarget originator,
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* UserID uidInitiator,
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* TokenID token_id)
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*
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* Functional Description:
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* This function is called when a user wishes to grab a token. Depending
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* on the current state of the token, the request will either succeed or
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* fail. Either way, an appropriate token grab confirm will be issued
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* to the requesting user.
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*
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* Formal Parameters:
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* originator (i)
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* This is a pointer to the attachment that leads to the originator
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* of the request.
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* uidInitiator (i)
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* This is the user ID of the user that originated the request.
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* token_id (i)
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* This is the token being acted upon.
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*
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* Return Value:
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* None.
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*
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* Side Effects:
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* None.
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*
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* Caveats:
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* None.
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*/
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/*
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* Void TokenGrabConfirm (
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* PCommandTarget originator,
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* Result result,
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* UserID uidInitiator,
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* TokenID token_id,
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* TokenStatus token_status)
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*
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* Functional Description:
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* This function is called as a result of the top provider answering a
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* previous grab request. It tells the user whether or not the request
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* succeeded.
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*
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* Formal Parameters:
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* originator (i)
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* This is a pointer to the attachment that leads to the originator
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* of the request.
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* result (i)
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* This is the result of the request. RESULT_SUCCESSFUL indicates
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* that the token was successfully grabbed.
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* uidInitiator (i)
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* This is the user ID of the user that originated the request.
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* token_id (i)
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* This is the token being acted upon.
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* token_status (i)
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* This is the status of the token after this request is processed.
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*
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* Return Value:
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* None.
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*
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* Side Effects:
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* None.
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*
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* Caveats:
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* None.
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*/
|
|
|
|
/*
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* Void TokenInhibitRequest (
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* PCommandTarget originator,
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* UserID uidInitiator,
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* TokenID token_id)
|
|
*
|
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* Functional Description:
|
|
* This function is called when a user wishes to inhibit a token.
|
|
* Depending on the current state of the token, the request will either
|
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* succeed or fail. Either way, an appropriate token inhibit confirm will
|
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* be issued to the requesting user.
|
|
*
|
|
* Formal Parameters:
|
|
* originator (i)
|
|
* This is a pointer to the attachment that leads to the originator
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* of the request.
|
|
* uidInitiator (i)
|
|
* This is the user ID of the user that originated the request.
|
|
* token_id (i)
|
|
* This is the token being acted upon.
|
|
*
|
|
* Return Value:
|
|
* None.
|
|
*
|
|
* Side Effects:
|
|
* None.
|
|
*
|
|
* Caveats:
|
|
* None.
|
|
*/
|
|
|
|
/*
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|
* Void TokenInhibitConfirm (
|
|
* PCommandTarget originator,
|
|
* Result result,
|
|
* UserID uidInitiator,
|
|
* TokenID token_id,
|
|
* TokenStatus token_status)
|
|
*
|
|
* Functional Description:
|
|
* This function is called as a result of the top provider answering a
|
|
* previous inhibit request. It tells the user whether or not the request
|
|
* succeeded.
|
|
*
|
|
* Formal Parameters:
|
|
* originator (i)
|
|
* This is a pointer to the attachment that leads to the originator
|
|
* of the request.
|
|
* result (i)
|
|
* This is the result of the request. RESULT_SUCCESSFUL indicates
|
|
* that the token was successfully inhibited.
|
|
* uidInitiator (i)
|
|
* This is the user ID of the user that originated the request.
|
|
* token_id (i)
|
|
* This is the token being acted upon.
|
|
* token_status (i)
|
|
* This is the status of the token after this request is processed.
|
|
*
|
|
* Return Value:
|
|
* None.
|
|
*
|
|
* Side Effects:
|
|
* None.
|
|
*
|
|
* Caveats:
|
|
* None.
|
|
*/
|
|
|
|
/*
|
|
* Void TokenGiveRequest (
|
|
* PCommandTarget originator,
|
|
* PTokenGiveRecord pTokenGiveRec)
|
|
*
|
|
* Functional Description:
|
|
* This function is called when a user wishes to give a token to another
|
|
* user. Depending on the current state of the token, the request will
|
|
* either succeed or fail. Either way, an appropriate token grab confirm
|
|
* will be issued to the requesting user.
|
|
*
|
|
* Formal Parameters:
|
|
* originator (i)
|
|
* This is a pointer to the attachment that leads to the originator
|
|
* of the request.
|
|
* pTokenGiveRec (i)
|
|
* This is the address of a structure containing the following information:
|
|
* The ID of the user attempting to give away the token.
|
|
* The ID of the token being given.
|
|
* The ID of the user that the token is being given to.
|
|
*
|
|
* Return Value:
|
|
* None.
|
|
*
|
|
* Side Effects:
|
|
* None.
|
|
*
|
|
* Caveats:
|
|
* None.
|
|
*/
|
|
|
|
/*
|
|
* Void TokenGiveIndication (
|
|
* PCommandTarget originator,
|
|
* PTokenGiveRecord pTokenGiveRec)
|
|
*
|
|
* Functional Description:
|
|
* This function is called when the top provider wants to indicate to a
|
|
* user that another user is offering them a token.
|
|
*
|
|
* Formal Parameters:
|
|
* originator (i)
|
|
* This is a pointer to the attachment that leads to the originator
|
|
* of the request.
|
|
* pTokenGiveRec (i)
|
|
* This is the address of a structure containing the following information:
|
|
* The ID of the user attempting to give away the token.
|
|
* The ID of the token being given.
|
|
* The ID of the user that the token is being given to.
|
|
*
|
|
* Return Value:
|
|
* None.
|
|
*
|
|
* Side Effects:
|
|
* None.
|
|
*
|
|
* Caveats:
|
|
* None.
|
|
*/
|
|
|
|
/*
|
|
* Void TokenGiveResponse (
|
|
* PCommandTarget originator,
|
|
* Result result,
|
|
* UserID receiver_id,
|
|
* TokenID token_id)
|
|
*
|
|
* Functional Description:
|
|
* This function is called in response to a previous give indication. It
|
|
* contains the user's answer as to whether or not the token was
|
|
* accepted.
|
|
*
|
|
* Formal Parameters:
|
|
* originator (i)
|
|
* This is a pointer to the attachment that leads to the originator
|
|
* of the request.
|
|
* result (i)
|
|
* This is the result of the request. RESULT_SUCCESSFUL indicates that
|
|
* the recipient has accepted the token.
|
|
* token_id (i)
|
|
* This is the token being acted upon.
|
|
* receiver_id (i)
|
|
* This is the ID of the user that is to receive the token.
|
|
*
|
|
* Return Value:
|
|
* None.
|
|
*
|
|
* Side Effects:
|
|
* None.
|
|
*
|
|
* Caveats:
|
|
* None.
|
|
*/
|
|
|
|
/*
|
|
* Void TokenGiveConfirm (
|
|
* PCommandTarget originator,
|
|
* Result result,
|
|
* UserID uidInitiator,
|
|
* TokenID token_id,
|
|
* TokenStatus token_status)
|
|
*
|
|
* Functional Description:
|
|
* This function is called to send a confirmation back to a user who
|
|
* is trying to give away a token. It lets the user know whether or
|
|
* not the operation was successful.
|
|
*
|
|
* Formal Parameters:
|
|
* originator (i)
|
|
* This is a pointer to the attachment that leads to the originator
|
|
* of the request.
|
|
* result (i)
|
|
* This is the result of the request. RESULT_SUCCESSFUL indicates that
|
|
* the recipient has accepted the token.
|
|
* uidInitiator (i)
|
|
* This is the user ID of the user that originated the request.
|
|
* token_id (i)
|
|
* This is the token being acted upon.
|
|
* token_status (i)
|
|
* This is the status of the token after the operation.
|
|
*
|
|
* Return Value:
|
|
* None.
|
|
*
|
|
* Side Effects:
|
|
* None.
|
|
*
|
|
* Caveats:
|
|
* None.
|
|
*/
|
|
|
|
/*
|
|
* Void TokenPleaseRequest (
|
|
* PCommandTarget originator,
|
|
* UserID uidInitiator,
|
|
* TokenID token_id)
|
|
*
|
|
* Functional Description:
|
|
* This function is called when a user wishes to ask the current owners
|
|
* of a token to relinquish it.
|
|
*
|
|
* Formal Parameters:
|
|
* originator (i)
|
|
* This is a pointer to the attachment that leads to the originator
|
|
* of the request.
|
|
* uidInitiator (i)
|
|
* This is the user ID of the user that originated the request.
|
|
* token_id (i)
|
|
* This is the token being acted upon.
|
|
*
|
|
* Return Value:
|
|
* None.
|
|
*
|
|
* Side Effects:
|
|
* None.
|
|
*
|
|
* Caveats:
|
|
* None.
|
|
*/
|
|
|
|
/*
|
|
* Void TokenPleaseIndication (
|
|
* PCommandTarget originator,
|
|
* UserID uidInitiator,
|
|
* TokenID token_id)
|
|
*
|
|
* Functional Description:
|
|
* This function is initially called by the top provider in response to
|
|
* a received token please request. It is forwarded to all users who
|
|
* currently own the specified token, asking them to relinquish it.
|
|
*
|
|
* Formal Parameters:
|
|
* originator (i)
|
|
* This is a pointer to the attachment that leads to the originator
|
|
* of the request.
|
|
* uidInitiator (i)
|
|
* This is the user ID of the user that originated the request.
|
|
* token_id (i)
|
|
* This is the token being acted upon.
|
|
*
|
|
* Return Value:
|
|
* None.
|
|
*
|
|
* Side Effects:
|
|
* None.
|
|
*
|
|
* Caveats:
|
|
* None.
|
|
*/
|
|
|
|
/*
|
|
* BOOL TokenReleaseRequest (
|
|
* PCommandTarget originator,
|
|
* UserID uidInitiator,
|
|
* TokenID token_id)
|
|
*
|
|
* Functional Description:
|
|
* This function is called when a user wishes to release a token.
|
|
* Depending on the current state of the token, the request will either
|
|
* succeed or fail. Either way, an appropriate token release confirm will
|
|
* be issued to the requesting user.
|
|
*
|
|
* Formal Parameters:
|
|
* originator (i)
|
|
* This is a pointer to the attachment that leads to the originator
|
|
* of the request.
|
|
* uidInitiator (i)
|
|
* This is the user ID of the user that originated the request.
|
|
* token_id (i)
|
|
* This is the token being acted upon.
|
|
*
|
|
* Return Value:
|
|
* None.
|
|
*
|
|
* Side Effects:
|
|
* None.
|
|
*
|
|
* Caveats:
|
|
* None.
|
|
*/
|
|
|
|
/*
|
|
* Void TokenReleaseConfirm (
|
|
* PCommandTarget originator,
|
|
* Result result,
|
|
* UserID uidInitiator,
|
|
* TokenID token_id,
|
|
* TokenStatus token_status)
|
|
*
|
|
* Functional Description:
|
|
* This function is called as a result of the top provider answering a
|
|
* previous release request. It tells the user whether or not the request
|
|
* succeeded.
|
|
*
|
|
* Formal Parameters:
|
|
* originator (i)
|
|
* This is a pointer to the attachment that leads to the originator
|
|
* of the request.
|
|
* result (i)
|
|
* This is the result of the request. RESULT_SUCCESSFUL indicates
|
|
* that the token was successfully released.
|
|
* uidInitiator (i)
|
|
* This is the user ID of the user that originated the request.
|
|
* token_id (i)
|
|
* This is the token being acted upon.
|
|
* token_status (i)
|
|
* This is the status of the token after this request is processed.
|
|
*
|
|
* Return Value:
|
|
* None.
|
|
*
|
|
* Side Effects:
|
|
* None.
|
|
*
|
|
* Caveats:
|
|
* None.
|
|
*/
|
|
|
|
/*
|
|
* Void TokenTestRequest (
|
|
* PCommandTarget originator,
|
|
* UserID uidInitiator,
|
|
* TokenID token_id)
|
|
*
|
|
* Functional Description:
|
|
* This function is called when a user wishes to test the current state
|
|
* of a token. The token will issue a token test confirm to the
|
|
* originating user containing the requested information.
|
|
*
|
|
* Formal Parameters:
|
|
* originator (i)
|
|
* This is a pointer to the attachment that leads to the originator
|
|
* of the request.
|
|
* uidInitiator (i)
|
|
* This is the user ID of the user that originated the request.
|
|
* token_id (i)
|
|
* This is the token being acted upon.
|
|
*
|
|
* Return Value:
|
|
* None.
|
|
*
|
|
* Side Effects:
|
|
* None.
|
|
*
|
|
* Caveats:
|
|
* None.
|
|
*/
|
|
|
|
/*
|
|
* Void TokenTestConfirm (
|
|
* PCommandTarget originator,
|
|
* UserID uidInitiator,
|
|
* TokenID token_id,
|
|
* TokenStatus token_status)
|
|
*
|
|
* Functional Description:
|
|
* This function is called as a result of the top provider answering a
|
|
* previous test request. It tells the user the current state of the
|
|
* token.
|
|
*
|
|
* Formal Parameters:
|
|
* originator (i)
|
|
* This is a pointer to the attachment that leads to the originator
|
|
* of the request.
|
|
* uidInitiator (i)
|
|
* This is the user ID of the user that originated the request.
|
|
* token_id (i)
|
|
* This is the token being tested.
|
|
* token_status (i)
|
|
* This is the current status of the token.
|
|
*
|
|
* Return Value:
|
|
* None.
|
|
*
|
|
* Side Effects:
|
|
* None.
|
|
*
|
|
* Caveats:
|
|
* None.
|
|
*/
|
|
|
|
#endif
|