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diff --git a/spec/Channel_Interface_Conference1.xml b/spec/Channel_Interface_Conference1.xml new file mode 100644 index 00000000..41a833c8 --- /dev/null +++ b/spec/Channel_Interface_Conference1.xml @@ -0,0 +1,628 @@ +<?xml version="1.0" ?> +<node name="/Channel_Interface_Conference1" + xmlns:tp="http://telepathy.freedesktop.org/wiki/DbusSpec#extensions-v0"> + <tp:copyright>Copyright © 2009 Collabora Limited</tp:copyright> + <tp:copyright>Copyright © 2009 Nokia Corporation</tp:copyright> + <tp:license xmlns="http://www.w3.org/1999/xhtml"> + <p>This library is free software; you can redistribute it and/or + modify it under the terms of the GNU Lesser General Public + License as published by the Free Software Foundation; either + version 2.1 of the License, or (at your option) any later version.</p> + + <p>This library is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + Lesser General Public License for more details.</p> + + <p>You should have received a copy of the GNU Lesser General Public + License along with this library; if not, write to the Free Software + Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA + 02110-1301, USA.</p> + </tp:license> + <interface + name="im.telepathy1.Channel.Interface.Conference1"> + <tp:added version="0.19.13">(as stable API)</tp:added> + <tp:requires interface="im.telepathy1.Channel"/> + <tp:requires + interface="im.telepathy1.Channel.Interface.Group1"/> + + <tp:docstring xmlns="http://www.w3.org/1999/xhtml"> + <p>An interface for multi-user conference channels that can "continue + from" one or more individual channels. This could be used to invite + other contacts to an existing 1-1 text conversation, combine two phone + calls into one conference call, and so on, with roughly the same API in + each case.</p> + + <tp:rationale> + <p>This interface addresses freedesktop.org <a + href="http://bugs.freedesktop.org/show_bug.cgi?id=24906">bug + #24906</a> (GSM-compatible conference calls) and <a + href="http://bugs.freedesktop.org/show_bug.cgi?id=24939">bug + #24939</a> (upgrading calls and chats to multi-user). + See those bugs for more rationale and use cases.</p> + </tp:rationale> + + <p>Existing channels are upgraded by requesting a new channel of the same + <tp:dbus-ref + namespace="im.telepathy1.Channel">ChannelType</tp:dbus-ref>, + listing the channels to be merged into the new conference in the + <tp:member-ref>InitialChannels</tp:member-ref> property of the request. + If <tp:member-ref>InitialInviteeHandles</tp:member-ref> and + <tp:member-ref>InitialInviteeIDs</tp:member-ref> are + <var>Allowed_Properties</var> in <tp:dbus-ref + namespace="im.telepathy1.Connection.Interface.Requests">RequestableChannelClasses</tp:dbus-ref>, + ad-hoc conferences to a set of contacts may be created by requesting a + channel, specifying + <tp:member-ref>InitialInviteeHandles</tp:member-ref> and/or + <tp:member-ref>InitialInviteeIDs</tp:member-ref> to be the contacts in + question. A request may specify these alongside + <tp:member-ref>InitialChannels</tp:member-ref>, to simultaneously + upgrade a channel to a conference and invite others to join it.</p> + + <p>Channels with this interface MAY also implement <tp:dbus-ref + namespace='imt1.Channel.Interface'>MergeableConference1</tp:dbus-ref> + to support merging more 1-1 channels into an ongoing conference. + Similarly, 1-1 channels MAY implement <tp:dbus-ref + namespace='imt1.Channel.Interface'>Splittable1</tp:dbus-ref> to + support being broken out of a Conference channel.</p> + + <p>The <tp:dbus-ref + namespace="im.telepathy1.Channel.Interface" + >Group1</tp:dbus-ref> interface on Conference channels MAY use + channel-specific handles for participants; clients SHOULD support + both Conferences that have channel-specific handles, and those that + do not.</p> + + <tp:rationale> + <p>In the GSM case, the Conference's Group interface MAY have + channel-specific handles, to represent the fact that the same + phone number may be in a conference twice (for instance, it could be + the number of a corporate switchboard).</p> + + <p>In the XMPP case, the Conference's Group interface SHOULD have + channel-specific handles, to reflect the fact that the participants + have MUC-specific identities, and the user might also be able to see + their global identities, or not.</p> + + <p>In most other cases, including MSN and link-local XMPP, the + Conference's Group interface SHOULD NOT have channel-specific + handles, since users' identities are always visible.</p> + </tp:rationale> + + <p>Connection managers implementing channels with this interface + MUST NOT allow the object paths of channels that could be merged + into a Conference to be re-used, unless the channel re-using the + object path is equivalent to the channel that previously used it.</p> + + <tp:rationale> + <p>If you upgrade some channels into a conference, and then close + the original channels, <tp:member-ref>InitialChannels</tp:member-ref> + (which is immutable) will contain paths to channels which no longer + exist. This implies that you should not re-use channel object paths, + unless future incarnations of the path are equivalent.</p> + + <p>For instance, on protocols where you can only have + zero or one 1-1 text channels with Emily at one time, it would + be OK to re-use the same object path for every 1-1 text channel + with Emily; but on protocols where this is not true, it would + be misleading.</p> + </tp:rationale> + + <h4>Examples of usage</h4> + + <p>A pair of 1-1 GSM calls <var>C1</var> and <var>C2</var> can be merged + into a single conference call by calling:</p> + + <blockquote> + <code><tp:dbus-ref namespace="im.telepathy1.Connection.Interface.Requests">CreateChannel</tp:dbus-ref>({ + ...<tp:dbus-ref namespace="im.telepathy1.Channel">ChannelType</tp:dbus-ref>: ...Call, + ...<tp:member-ref>InitialChannels</tp:member-ref>: [C1, C2] + })</code> + </blockquote> + + <p>which returns a new channel <var>Cn</var> implementing the conference + interface. (As a quirk of GSM, both 1-1 will cease to function normally + until they are <tp:dbus-ref + namespace="imt1.Channel.Interface.Splittable1">Split</tp:dbus-ref> + from the conference, or the conference ends.)</p> + + <p>An XMPP 1-1 conversation <var>C3</var> (with + <tt>chris@example.com</tt>, say) can be continued in a newly created + multi-user chatroom by calling:</p> + + <blockquote> + <code>CreateChannel({ + ...ChannelType: ...Text, + ...<tp:member-ref>InitialChannels</tp:member-ref>: [C3] + })</code> + </blockquote> + + <p>Or, to invite <tt>emily@example.net</tt> to join the newly-created MUC + at the same time:</p> + + <blockquote> + <code>CreateChannel({ + ...ChannelType: ...Text, + ...<tp:member-ref>InitialChannels</tp:member-ref>: [C3], + ...<tp:member-ref>InitialInviteeIDs</tp:member-ref>: ['emily@example.net'] + })</code> + </blockquote> + + <p>To continue <var>C3</var> in a particular multi-user + chatroom (rather than the implementation inventing a unique name for + the room), call:</p> + + <blockquote> + <code><tp:dbus-ref namespace="im.telepathy1.Connection.Interface.Requests">EnsureChannel</tp:dbus-ref>({ + ...ChannelType: ...Text, + ...<tp:dbus-ref namespace="im.telepathy1.Channel">TargetHandleType</tp:dbus-ref>: ...Room, + ...<tp:dbus-ref namespace="im.telepathy1.Channel">TargetID</tp:dbus-ref>: 'telepathy@conf.example.com', + ...<tp:member-ref>InitialChannels</tp:member-ref>: [C3] + })</code> + </blockquote> + + <p>Note the use of EnsureChannel — if a channel for + <tt>telepathy@conf.example.com</tt> is already open, this SHOULD be + equivalent to inviting <tt>chris@example.com</tt> to the existing + channel.</p> + + <p>In the above cases, the text channel <var>C3</var> SHOULD remain open + and fully functional (until explicitly closed by a client); new + incoming 1-1 messages from <tt>chris@example.com</tt> SHOULD appear in + <var>C3</var>, and messages sent using <var>C3</var> MUST be relayed + only to <tt>chris@example.com</tt>.</p> + + <tp:rationale> + <p>If there is an open 1-1 text channel with a contact, in every + other situation new messages will appear in that channel. Given + that the old channel remains open — which is the least surprising + behaviour, and eases us towards a beautiful world where channels + never close themselves — it stands to reason that it should be + where new messages from Chris should appear. On MSN, creating a + conference from <var>C3</var> should migrate the underlying + switchboard from <var>C3</var> to the new channel; this is an + implementation detail, and should not affect the representation on + D-Bus. With a suitable change of terminology, Skype has the same + behaviour.</p> + + <p>If the current handler of that channel doesn't want this to happen + (maybe it transformed the existing tab into the group chat window, + and so there'd be no UI element still around to show new messages), + then it should just <tp:dbus-ref + namespace="im.telepathy1.Channel">Close</tp:dbus-ref> the + old 1-1 channel; it'll respawn if necessary.</p> + </tp:rationale> + + <p>Either of the XMPP cases could work for Call channels, to + upgrade from 1-1 Jingle to multi-user Jingle. Any of the XMPP cases + could in principle work for link-local XMPP (XEP-0174).</p> + + <p>XMPP and MSN do not natively have a concept of merging two or more + channels C1, C2... into one channel, Cn. However, the GSM-style + merging API can be supported on XMPP and MSN, as an API short-cut + for upgrading C1 into a conference Cn (which invites the + TargetHandle of C1 into Cn), then immediately inviting the + TargetHandle of C2, the TargetHandle of C3, etc. into Cn as well.</p> + + <h4>Sample <tp:dbus-ref namespace='imt1.Connection.Interface.Requests' + >RequestableChannelClasses</tp:dbus-ref></h4> + + <p>A GSM connection might advertise the following channel class for + conference calls:</p> + + <blockquote> + <code> +( Fixed = {<br/> + ...<tp:dbus-ref namespace='imt1.Channel'>ChannelType</tp:dbus-ref>: + ...<tp:dbus-ref namespace='imt1.Channel.Type'>Call1</tp:dbus-ref><br/> + },<br/> + Allowed = [ <tp:member-ref>InitialChannels</tp:member-ref>, + <tp:dbus-ref namespace='imt1.Channel.Type.Call1' + >InitialAudio</tp:dbus-ref> + ]<br/> +) + </code> + </blockquote> + + <p>This indicates support for starting audio-only conference calls by + merging two or more existing channels (since + <tp:member-ref>InitialInviteeHandles</tp:member-ref> and + <tp:member-ref>InitialInviteeIDs</tp:member-ref> are not allowed).</p> + + <p>An XMPP connection might advertise the following classes for ad-hoc + multi-user text chats:</p> + + <blockquote> + <code> +( Fixed = {<br/> + ...<tp:dbus-ref namespace='imt1.Channel'>ChannelType</tp:dbus-ref>: + ...<tp:dbus-ref namespace='imt1.Channel.Type'>Text</tp:dbus-ref><br/> + },<br/> + Allowed = [ <tp:member-ref>InitialChannels</tp:member-ref>, + <tp:member-ref>InitialInviteeHandles</tp:member-ref>, + <tp:member-ref>InitialInviteeIDs</tp:member-ref>, + <tp:member-ref>InvitationMessage</tp:member-ref> + ]<br/> +),<br/> +( Fixed = {<br/> + ...<tp:dbus-ref namespace='imt1.Channel'>ChannelType</tp:dbus-ref>: + ...<tp:dbus-ref namespace='imt1.Channel.Type'>Text</tp:dbus-ref>,<br/> + ...<tp:dbus-ref namespace='imt1.Channel'>TargetHandleType</tp:dbus-ref>: + Room<br/> + },<br/> + Allowed = [ <tp:dbus-ref namespace='imt1.Channel'>TargetHandle</tp:dbus-ref>, + <tp:dbus-ref namespace='imt1.Channel'>TargetID</tp:dbus-ref>,<br/> + <tp:member-ref>InitialChannels</tp:member-ref>, + <tp:member-ref>InitialInviteeHandles</tp:member-ref>, + <tp:member-ref>InitialInviteeIDs</tp:member-ref>, + <tp:member-ref>InvitationMessage</tp:member-ref> + ]<br/> +) + </code> + </blockquote> + + <p>The first class indicates support for starting ad-hoc (nameless) chat + rooms, upgraded from existing 1-1 channels and/or inviting new + contacts, along with a message to be sent along with the invitations. + The second indicates support for upgrading to a particular named chat + room.</p> + </tp:docstring> + + <property name="Channels" tp:name-for-bindings="Channels" + access="read" type="ao"> + <tp:docstring xmlns="http://www.w3.org/1999/xhtml"> + <p>The individual <tp:dbus-ref + namespace="im.telepathy1">Channel</tp:dbus-ref>s that + are continued by this conference, which have the same <tp:dbus-ref + namespace="im.telepathy1.Channel" + >ChannelType</tp:dbus-ref> as this one, but with <tp:dbus-ref + namespace="im.telepathy1.Channel" + >TargetHandleType</tp:dbus-ref> = CONTACT.</p> + + <p>This property MUST NOT be requestable; instead, the + <tp:member-ref>InitialChannels</tp:member-ref> property may be + specified when requesting a channel.</p> + + <tp:rationale> + <p>This is consistent with requesting + <tp:member-ref>InitialInviteeHandles</tp:member-ref> and + <tp:member-ref>InitialInviteeIDs</tp:member-ref>, rather than + requesting <tp:dbus-ref + namespace="im.telepathy1.Channel.Interface">Group1.Members</tp:dbus-ref> + and some hypothetical ID version of that property.</p> + </tp:rationale> + + <p>Change notification is via the + <tp:member-ref>ChannelMerged</tp:member-ref> and + <tp:member-ref>ChannelRemoved</tp:member-ref> signals.</p> + </tp:docstring> + </property> + + <signal name="ChannelMerged" tp:name-for-bindings="Channel_Merged"> + <tp:docstring xmlns="http://www.w3.org/1999/xhtml"> + <p>Emitted when a new channel is added to the value of + <tp:member-ref>Channels</tp:member-ref>.</p> + </tp:docstring> + + <arg name="Channel" type="o"> + <tp:docstring>The channel that was added to + <tp:member-ref>Channels</tp:member-ref>.</tp:docstring> + </arg> + + <arg name="Channel_Specific_Handle" type="u" tp:type="Contact_Handle"> + <tp:docstring>A new channel-specific handle for the <tp:dbus-ref + namespace="imt1.Channel">TargetHandle</tp:dbus-ref> of + <var>Channel</var>, as will appear in + <tp:member-ref>OriginalChannels</tp:member-ref>, or <tt>0</tt> if a + global handle is used for + <var>Channel</var>'s TargetHandle on the <tp:dbus-ref + namespace="imt1.Channel.Interface">Group1</tp:dbus-ref> interface + of this channel.</tp:docstring> + </arg> + + <arg name="Properties" type="a{sv}" + tp:type="Qualified_Property_Value_Map"> + <tp:docstring><var>Channel</var>'s immutable properties.</tp:docstring> + </arg> + </signal> + + <signal name="ChannelRemoved" tp:name-for-bindings="Channel_Removed"> + <tp:docstring xmlns="http://www.w3.org/1999/xhtml"> + <p>Emitted when a channel is removed from the value of + <tp:member-ref>Channels</tp:member-ref>, either because it closed + or because it was split using the <tp:dbus-ref + namespace="im.telepathy1.Channel.Interface" + >Splittable1.Split</tp:dbus-ref> method.</p> + + <p>If a channel is removed because it was closed, <tp:dbus-ref + namespace='imt1.Channel'>Closed</tp:dbus-ref> should be emitted + before this signal.</p> + </tp:docstring> + + <arg name="Channel" type="o"> + <tp:docstring>The channel that was removed from + <tp:member-ref>Channels</tp:member-ref>.</tp:docstring> + </arg> + + <arg name="Details" type="a{sv}" tp:type="String_Variant_Map"> + <tp:docstring xmlns="http://www.w3.org/1999/xhtml"> + Additional information about the removal, which may include + the same well-known keys as the Details argument of + <tp:dbus-ref namespace="imt1.Channel.Interface.Group1" + >MembersChanged</tp:dbus-ref>, with the same semantics. + </tp:docstring> + </arg> + </signal> + + <property name="InitialChannels" tp:name-for-bindings="Initial_Channels" + access="read" type="ao" tp:immutable="yes" tp:requestable="yes"> + <tp:docstring xmlns="http://www.w3.org/1999/xhtml"> + <p>The initial value of <tp:member-ref>Channels</tp:member-ref>.</p> + + <p>This property SHOULD be requestable. Omitting it from a request is + equivalent to providing it with an empty list as value. Requests + where its value has at least two channel paths SHOULD be expected to + succeed on any implementation of this interface. If + <tp:member-ref>InitialInviteeHandles</tp:member-ref> and + <tp:member-ref>InitialInviteeIDs</tp:member-ref> are + <var>Allowed_Properties</var> in <tp:dbus-ref + namespace='imt1.Connection.Interface.Requests' + >RequestableChannelClasses</tp:dbus-ref>, then requests with zero + or one channel paths SHOULD also succeed; otherwise, clients SHOULD + NOT make requests with zero or one paths for this property.</p> + + <tp:rationale> + <p>In GSM, a pair of calls can be merged into a conference, but you + can't start a conference call from zero or one existing calls. In + XMPP and MSN, you can create a new chatroom, or upgrade one 1-1 + channel into a chatroom; however, on these protocols, it is also + possible to fake GSM-style merging by upgrading the first channel, + then inviting the targets of all the other channels into it.</p> + </tp:rationale> + + <p>If possible, the <tp:member-ref>Channels</tp:member-ref>' states SHOULD + NOT be altered by merging them into a conference. However, depending on + the protocol, the Channels MAY be placed in a "frozen" state by placing + them in this property's value or by calling + <tp:dbus-ref + namespace="im.telepathy1.Channel.Interface" + >MergeableConference1.Merge</tp:dbus-ref> on them.</p> + + <tp:rationale> + <p>In Jingle, nothing special will happen to merged calls. UIs MAY + automatically place calls on hold before merging them, if that is + the desired behaviour; this SHOULD always work. Not doing + an implicit hold/unhold seems to preserve least-astonishment.</p> + + <p>In GSM, the calls that are merged go into a state similar to + Hold, but they cannot be unheld, only split from the conference + call using <tp:dbus-ref namespace="im.telepathy1" + >Channel.Interface.Splittable1.Split</tp:dbus-ref>.</p> + </tp:rationale> + + <p>Depending on the protocol, it might be signalled to remote users + that this channel is a continuation of all the requested channels, + or that it is only a continuation of the first channel in the + list.</p> + + <tp:rationale> + <p>In MSN, the conference steals the underlying switchboard (protocol + construct) from one of its component channels, so the conference + appears to remote users to be a continuation of that channel and no + other. The connection manager has to make some arbitrary choice, so + we arbitrarily mandate that it SHOULD choose the first channel in + the list as the one to continue.</p> + </tp:rationale> + </tp:docstring> + </property> + + <property name="InitialInviteeHandles" + tp:name-for-bindings="Initial_Invitee_Handles" + access="read" type="au" tp:type="Contact_Handle[]" tp:immutable="yes" + tp:requestable="yes"> + <tp:docstring xmlns="http://www.w3.org/1999/xhtml"> + <p>A list of additional contacts invited to this conference when it + was created.</p> + + <p>If it is possible to invite new contacts when creating a conference + (as opposed to merging several channels into one new conference + channel), this property SHOULD be requestable, and appear in the allowed + properties in <tp:dbus-ref + namespace="im.telepathy1.Connection.Interface.Requests" + >RequestableChannelClasses</tp:dbus-ref>. Otherwise, this property + SHOULD NOT be requestable, and its value SHOULD always be the empty + list.</p> + + <tp:rationale> + <p>On GSM you have to place a 1-1 call before you can merge it into a + conference; on the other hand, you can invite new contacts to XMPP + Muji calls and XMPP/MSN/Skype ad-hoc chat rooms without starting a + 1-1 channel with them first.</p> + </tp:rationale> + + <p>If included in a request, the given contacts are automatically + invited into the new channel, as if they had been added with + <tp:dbus-ref namespace="im.telepathy1.Channel.Interface" + >Group1.AddMembers</tp:dbus-ref>(InitialInviteeHandles, + <tp:member-ref>InvitationMessage</tp:member-ref>) immediately after + the channel was created.</p> + + <tp:rationale> + <p>This is a simple convenience API for the common case that a UI + upgrades a 1-1 chat to a multi-user chat solely in order to invite + someone else to participate.</p> + </tp:rationale> + + <p>If the local user was not the initiator of this channel, the + <tp:dbus-ref namespace="im.telepathy1.Channel.Interface" + >Group1.SelfHandle</tp:dbus-ref> SHOULD appear in the value of this + property, together with any other contacts invited at the same time + (if that information is known).</p> + + <p>InitialInviteeHandles, InitialInviteeIDs and InitialChannels MAY be + combined in a single request.</p> + + <tp:rationale> + <p>For example, if you have a 1-1 channel C1 with Rob, and you want + to invite Sjoerd to join the discussion, you can do so by + requesting a channel with InitialChannels=[C1] and + InitialInviteeHandles=[sjoerd], + or InitialChannels=[C1] and + InitialInviteeIDs=["sjoerd@example.com"].</p> + </tp:rationale> + + <p>If a request includes some combination of InitialInviteeHandles, + InitialInviteeIDs and InitialChannels, then the value of + InitialInviteeHandles on the resulting channel SHOULD be the union of + the handles from InitialInviteeHandles, the handles corresponding + to the InitialInviteeIDs, and the target handles of the + InitialChannels, with any duplicate handles removed. Because this + property is immutable, its value SHOULD be computed before the + channel is announced via the NewChannels signal.</p> + + <tp:rationale> + <p>This simplifies identification of new channels in clients - they + only have to look at one of the properties, not both. For example, + after either of the requests mentioned above, the NewChannels + signal would announce the channel with InitialChannels=[C1], + InitialInviteeHandles=[rob, sjoerd], and + InitialInviteeIDs=["rob@example.net", "sjoerd.example.com"].</p> + </tp:rationale> + </tp:docstring> + </property> + + <property name="InitialInviteeIDs" + tp:name-for-bindings="Initial_Invitee_IDs" + access="read" type="as" tp:immutable="yes" tp:requestable="yes"> + <tp:docstring xmlns="http://www.w3.org/1999/xhtml"> + <p>A list of additional contacts invited to this conference when it + was created.</p> + + <p>This property SHOULD be requestable if and only if + <tp:member-ref>InitialInviteeHandles</tp:member-ref> is requestable. + Its semantics are the same, except that it takes a list of the + string representations of contact handles; invitations are sent to + any contact present in either or both of these properties.</p> + + <p>When a channel is created, the values of InitialInviteeHandles and + InitialInviteeIDs MUST correspond to each other. In particular, this + means that the value of InitialInviteeIDs will include the TargetID + of each channel in InitialChannels, and the ID corresponding to each + handle in InitialInviteeHandles.</p> + </tp:docstring> + </property> + + <property name="InvitationMessage" tp:name-for-bindings="Invitation_Message" + access="read" type="s" tp:immutable="yes" tp:requestable="yes"> + <tp:docstring xmlns="http://www.w3.org/1999/xhtml"> + <p>The message that was sent to the + <tp:member-ref>InitialInviteeHandles</tp:member-ref> when they were + invited.</p> + + <p>This property SHOULD be requestable, and appear in the allowed + properties in <tp:dbus-ref + namespace="im.telepathy1.Connection.Interface.Requests" + >RequestableChannelClasses</tp:dbus-ref>, in protocols where + invitations can have an accompanying text message.</p> + + <tp:rationale> + <p>This allows invitations with a message to be sent when using + <tp:member-ref>InitialInviteeHandles</tp:member-ref> or + <tp:member-ref>InitialInviteeIDs</tp:member-ref>.</p> + </tp:rationale> + + <p>If the local user was not the initiator of this channel, the + message with which they were invited (if any) SHOULD appear in the + value of this property.</p> + </tp:docstring> + </property> + + <property name="OriginalChannels" tp:name-for-bindings="Original_Channels" + type="a{uo}" tp:type="Channel_Originator_Map" + access="read"> + <tp:docstring xmlns="http://www.w3.org/1999/xhtml"> + <p>On GSM conference calls, it is possible to have the same phone + number in a conference twice; for instance, it could be the number of + a corporate switchboard. This is represented using channel-specific + handles; whether or not a channel uses channel-specific handles is + reported in <tp:dbus-ref + namespace='imt1.Channel.Interface'>Group1.GroupFlags</tp:dbus-ref>. + The <tp:dbus-ref + namespace="im.telepathy1.Channel.Interface">Group1.HandleOwners</tp:dbus-ref> + property specifies the mapping from opaque channel-specific handles + to actual numbers; this property specifies the original 1-1 channel + corresponding to each channel-specific handle in the conference.</p> + + <p>In protocols where this situation cannot arise, such as XMPP, + this property MAY remain empty.</p> + + <p>For example, consider this situation:</p> + + <ol> + <li>Place a call (with path <tt>/call/to/simon</tt>) to the contact + <tt>+441234567890</tt> (which is assigned the handle <var>h</var>, + say), and ask to be put through to Simon McVittie;</li> + <li>Put that call on hold;</li> + <li>Place another call (with path <tt>/call/to/jonny</tt>) to + <tt>+441234567890</tt>, and ask to be put + through to Jonny Lamb;</li> + <li>Request a new channel with + <tp:member-ref>InitialChannels</tp:member-ref>: + <tt>['/call/to/simon', '/call/to/jonny']</tt>.</li> + </ol> + + <p>The new channel will have the following properties, for some handles + <var>s</var> and <var>j</var>:</p> + + <blockquote> + <code>{<br/> + ...<tp:dbus-ref + namespace="imt1.Channel.Interface">Group1.GroupFlags</tp:dbus-ref>: + Channel_Specific_Handles | (other flags),<br/> + ...<tp:dbus-ref + namespace="imt1.Channel.Interface">Group1.Members</tp:dbus-ref>: + [self_handle, s, j],<br/> + ...<tp:dbus-ref + namespace="imt1.Channel.Interface">Group1.HandleOwners</tp:dbus-ref>: + { s: h, j: h },<br/> + ...<tp:member-ref>InitialChannels</tp:member-ref>: + ['/call/to/simon', '/call/to/jonny'],<br/> + ...<tp:member-ref>Channels</tp:member-ref>: + ['/call/to/simon', '/call/to/jonny'],<br/> + ...<tp:member-ref>OriginalChannels</tp:member-ref>: + { s: '/call/to/simon', j: '/call/to/jonny' },<br/> + # ...standard properties like ChannelType: Group elided...<br/> + }</code> + </blockquote> + + <p>Change notification is via the + <tp:member-ref>ChannelMerged</tp:member-ref> and + <tp:member-ref>ChannelRemoved</tp:member-ref> signals: if + <var>Channel_Specific_Handle</var> in the former is non-zero, this + property SHOULD be updated to map that handle to the merged channel's + path.</p> + </tp:docstring> + </property> + + <tp:mapping name="Channel_Originator_Map"> + <tp:member name="Channel_Specific_Handle" type="u" tp:type="Contact_Handle"> + <tp:docstring xmlns="http://www.w3.org/1999/xhtml"> + A channel-specific handle for a participant in this conference. + </tp:docstring> + </tp:member> + <tp:member name="Original_Channel" type="o"> + <tp:docstring xmlns="http://www.w3.org/1999/xhtml"> + The object path of <tp:member-ref>Channels</tp:member-ref> + representing the original 1-1 channel with + <var>Channel_Specific_Handle</var>. + </tp:docstring> + </tp:member> + + <tp:docstring xmlns="http://www.w3.org/1999/xhtml"> + A mapping from members of a conference to the original 1-1 channel with + that contact, if any. See + <tp:member-ref>OriginalChannels</tp:member-ref> for details. + </tp:docstring> + </tp:mapping> + </interface> +</node> |