You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
364 lines
11 KiB
364 lines
11 KiB
/*
|
|
* userchnl.h
|
|
*
|
|
* Copyright (c) 1993 - 1995 by DataBeam Corporation, Lexington, KY
|
|
*
|
|
* Abstract:
|
|
* This is the interface file for the UserChannel class. Objects of this
|
|
* class represent user ID channels in the MCS environment. This class
|
|
* inherits most of its behavior from class Channel. In fact, with the
|
|
* exception of how user channels are joined, and how merge commands are
|
|
* constructed, this class works exactly the same as class Channel.
|
|
*
|
|
* When a user attaches to a domain, each provider in the path from the
|
|
* Top Provider to the user will create an object of this class. Unlike
|
|
* static and assigned channels, it is NOT necessary for the user to
|
|
* be joined to the channel for the channel to exist. It is perfectly
|
|
* legal to have a user channel that no one is joined to.
|
|
*
|
|
* The major distinguishing characteristic of user channels is that they
|
|
* know the user ID of the user they are associated with. They will
|
|
* only allow that user to join the channel. Furthermore, when the user
|
|
* leaves the usert channel, the LeaveRequest does not return a value
|
|
* asking to be deleted. Anyone can send data on a user ID channel.
|
|
*
|
|
* The merge channel command is constructed slightly differently for user
|
|
* channels, so that behavior is overridden here as well.
|
|
*
|
|
* Caveats:
|
|
* None.
|
|
*
|
|
* Author:
|
|
* James P. Galvin, Jr.
|
|
*/
|
|
#ifndef _USERCHANNEL_
|
|
#define _USERCHANNEL_
|
|
|
|
/*
|
|
* This is the class definition for the UserChannel class.
|
|
*/
|
|
class UserChannel : public Channel
|
|
{
|
|
public:
|
|
UserChannel (
|
|
ChannelID channel_id,
|
|
CAttachment *user_attachment,
|
|
PDomain local_provider,
|
|
PConnection top_provider,
|
|
CChannelList2 *channel_list,
|
|
CAttachmentList *attachment_list);
|
|
UserChannel (
|
|
ChannelID channel_id,
|
|
CAttachment *user_attachment,
|
|
PDomain local_provider,
|
|
PConnection top_provider,
|
|
CChannelList2 *channel_list,
|
|
CAttachmentList *attachment_list,
|
|
PConnection pConn);
|
|
virtual ~UserChannel ();
|
|
virtual Channel_Type GetChannelType ();
|
|
virtual BOOL IsValid ();
|
|
virtual CAttachment *GetAttachment(void);
|
|
virtual Void IssueMergeRequest ();
|
|
virtual Void ChannelJoinRequest (
|
|
CAttachment *originator,
|
|
UserID uidInitiator,
|
|
ChannelID channel_id);
|
|
virtual Void SendDataRequest (
|
|
CAttachment *originator,
|
|
UINT type,
|
|
PDataPacket data_packet);
|
|
|
|
private:
|
|
|
|
CAttachment *m_pUserAttachment;
|
|
};
|
|
typedef UserChannel * PUserChannel;
|
|
|
|
/*
|
|
* UserChannel (
|
|
* ChannelID channel_id,
|
|
* PCommandTarget user_attachment,
|
|
* PDomain local_provider,
|
|
* PConnection top_provider,
|
|
* PChannelList channel_list,
|
|
* PAttachmentList attachment_list)
|
|
*
|
|
* Functional Description:
|
|
* This is the normal constructor for the UserChannel class. It simply
|
|
* initializes the instance variables that identify the channel, the local
|
|
* provider, the top provider, and the user attachment. The attachment
|
|
* list is empty by default (meaning that the user is not yet joined to
|
|
* its channel).
|
|
*
|
|
* Upon successful construction of this object, an attach user confirm
|
|
* is automatically issued to the user.
|
|
*
|
|
* Formal Parameters:
|
|
* channel_id (i)
|
|
* This is the ID of the channel object. By keeping track of this
|
|
* internally, it doesn't have to be passed in for every operation.
|
|
* user_attachment (i)
|
|
* This is the attachment which leads to the user represented by this
|
|
* UserChannel object. It does not matter if it is a local attachment
|
|
* or a remote attachment. This is used to issue MCS commands (such
|
|
* as attach user confirm) to the user.
|
|
* local_provider (i)
|
|
* This is the identity of the local provider. A UserChannel object
|
|
* needs this since it issues MCS commands on behalf of the local
|
|
* provider.
|
|
* top_provider (i)
|
|
* This is a pointer to the top provider. This is used by the
|
|
* UserChannel object when it needs to issue a request to the Top
|
|
* Provider.
|
|
* channel_list (i)
|
|
* This is a pointer to the domain's channel list, which identifies
|
|
* all valid channels in the domain. This is used by channel objects
|
|
* to validate user IDs.
|
|
* attachment_list (i)
|
|
* This is a pointer to the domain's attachment list, which identifies
|
|
* all valid attachments in the domain. This is used by channel
|
|
* objects to validate joined attachments.
|
|
*
|
|
* Return Value:
|
|
* None.
|
|
*
|
|
* Side Effects:
|
|
* None.
|
|
*
|
|
* Caveats:
|
|
* None.
|
|
*/
|
|
|
|
/*
|
|
* UserChannel (
|
|
* ChannelID channel_id,
|
|
* PCommandTarget user_attachment,
|
|
* PDomain local_provider,
|
|
* PConnection top_provider,
|
|
* PChannelList channel_list,
|
|
* PAttachmentList attachment_list,
|
|
* PCommandTarget attachment)
|
|
*
|
|
* Functional Description:
|
|
* This is a secondary version of the constructor that is used only during
|
|
* merge operations. The only difference between this one and the one
|
|
* above is that this one allows the specification of an initial
|
|
* attachment. This allows a UserChannel object to be constructed with the
|
|
* user already joined to the channel. The initial attachment should be
|
|
* the same as the user attachment.
|
|
*
|
|
* This version of the constructor will not issue an attach user confirm
|
|
* or a channel join confirm to the user.
|
|
*
|
|
* Formal Parameters:
|
|
* channel_id (i)
|
|
* This is the ID of the channel object. By keeping track of this
|
|
* internally, it doesn't have to be passed in for every operation.
|
|
* user_attachment (i)
|
|
* This is the attachment which leads to the user represented by this
|
|
* UserChannel object. It does not matter if it is a local attachment
|
|
* or a remote attachment. This is used to issue MCS commands (such
|
|
* as attach user confirm) to the user.
|
|
* local_provider (i)
|
|
* This is the identity of the local provider. A UserChannel object
|
|
* needs this since it issues MCS commands on behalf of the local
|
|
* provider.
|
|
* top_provider (i)
|
|
* This is a pointer to the top provider. This is used by the
|
|
* UserChannel object when it needs to issue a request to the Top
|
|
* Provider.
|
|
* channel_list (i)
|
|
* This is a pointer to the domain's channel list, which identifies
|
|
* all valid channels in the domain. This is used by channel objects
|
|
* to validate user IDs.
|
|
* attachment_list (i)
|
|
* This is a pointer to the domain's attachment list, which identifies
|
|
* all valid attachments in the domain. This is used by channel
|
|
* objects to validate joined attachments.
|
|
* attachment (i)
|
|
* This is the initial attachment for the channel. A channel join
|
|
* confirm is NOT issued to the attachment.
|
|
*
|
|
* Return Value:
|
|
* None.
|
|
*
|
|
* Side Effects:
|
|
* None.
|
|
*
|
|
* Caveats:
|
|
* None.
|
|
*/
|
|
|
|
/*
|
|
* ~UserChannel ()
|
|
*
|
|
* Functional Description:
|
|
* This is the UserChannel class destructor. It does nothing at this time.
|
|
* The base class constructor takes care of clearing the attachment list.
|
|
*
|
|
* Formal Parameters:
|
|
* None.
|
|
*
|
|
* Return Value:
|
|
* None.
|
|
*
|
|
* Side Effects:
|
|
* None.
|
|
*
|
|
* Caveats:
|
|
* None.
|
|
*/
|
|
|
|
/*
|
|
* Channel_Type GetChannelType ()
|
|
*
|
|
* Functional Description:
|
|
* This virtual member function returns the type of the channel. For this
|
|
* class it will always be USER_CHANNEL.
|
|
*
|
|
* Formal Parameters:
|
|
* None.
|
|
*
|
|
* Return Value:
|
|
* USER_CHANNEL
|
|
*
|
|
* Side Effects:
|
|
* None.
|
|
*
|
|
* Caveats:
|
|
* None.
|
|
*/
|
|
/*
|
|
* BOOL IsValid ()
|
|
*
|
|
* Functional Description:
|
|
* This function always returns TRUE since User ID channels are always
|
|
* valid (as long as the user is still attached).
|
|
*
|
|
* Formal Parameters:
|
|
* None.
|
|
*
|
|
* Return Value:
|
|
* TRUE
|
|
*
|
|
* Side Effects:
|
|
* None.
|
|
*
|
|
* Caveats:
|
|
* None.
|
|
*/
|
|
|
|
/*
|
|
* CAttachment *GetAttachment ()
|
|
*
|
|
* Functional Description:
|
|
* This function is used to retrieve the attachment associated with the
|
|
* user represented by this object. This is used by Domain objects when
|
|
* it is necessary to send an MCS command to a user, and it needs to know
|
|
* how to get it there. That information is currently excapsulated within
|
|
* this class.
|
|
*
|
|
* Formal Parameters:
|
|
* None.
|
|
*
|
|
* Return Value:
|
|
* A pointer to the attachment that leads to the user represented by this
|
|
* object.
|
|
*
|
|
* Side Effects:
|
|
* None.
|
|
*
|
|
* Caveats:
|
|
* None.
|
|
*/
|
|
|
|
/*
|
|
* Void IssueMergeRequest ()
|
|
*
|
|
* Functional Description:
|
|
* This member function causes the UserChannel object to issue a merge
|
|
* request to the top provider. It will pack the appropriate local
|
|
* information into the command.
|
|
*
|
|
* Formal Parameters:
|
|
* None.
|
|
*
|
|
* Return Value:
|
|
* None.
|
|
*
|
|
* Side Effects:
|
|
* None.
|
|
*
|
|
* Caveats:
|
|
* None.
|
|
*/
|
|
|
|
/*
|
|
* Void ChannelJoinRequest (
|
|
* PCommandTarget originator,
|
|
* UserID uidInitiator,
|
|
* ChannelID channel_id)
|
|
*
|
|
* Functional Description:
|
|
* This function is invoked when a user tries to join the channel
|
|
* associated with a UserChannel object. The originator of the request
|
|
* will only be permitted to join if their user ID matches that of the
|
|
* user with which this UserChannel object is associated. If it does,
|
|
* then the originator will be permitted to join.
|
|
*
|
|
* If this provider is not the Top Provider, then the request will be
|
|
* forwarded upward to the Top Provider. If this is the Top Provider,
|
|
* the a channel join confirm will be issued back to the requesting
|
|
* user.
|
|
*
|
|
* Formal Parameters:
|
|
* originator (i)
|
|
* This is the attachment of the user wishing to join the channel.
|
|
* uidInitiator (i)
|
|
* This is the user ID of the user joining the channel. This must
|
|
* be the same as the user ID represented by the object, or the
|
|
* request will automatically be rejected.
|
|
* channel_id (i)
|
|
* This is the channel being acted upon.
|
|
*
|
|
* Return Value:
|
|
* None.
|
|
*
|
|
* Side Effects:
|
|
* None.
|
|
*
|
|
* Caveats:
|
|
* None.
|
|
*/
|
|
/*
|
|
* Void SendDataRequest (
|
|
* PCommandTarget originator,
|
|
* PDataPacket data_packet)
|
|
*
|
|
* Functional Description:
|
|
* This member function handles a send data request on the channel. It
|
|
* determines where to send the data. This differs from the base class
|
|
* implementation only in that it is unnecessary to send data upward
|
|
* if it is known that the user is in the sub-tree of the current
|
|
* provider.
|
|
*
|
|
* Formal Parameters:
|
|
* originator (i)
|
|
* This is the attachment from which the data originated.
|
|
* data_packet (i)
|
|
* This is a pointer to a DataPacket object containing the channel
|
|
* ID, the User ID of the data sender, segmentation flags, priority of
|
|
* the data packet and a pointer to the packet to be sent.
|
|
*
|
|
* Return Value:
|
|
* None.
|
|
*
|
|
* Side Effects:
|
|
* None.
|
|
*
|
|
* Caveats:
|
|
* None.
|
|
*/
|
|
|
|
#endif
|