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<h1 class="title" id="page-title">Session Negotiation</h1> <div class="region region-content">
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<span property="dc:title" content="Session Negotiation" class="rdf-meta element-hidden"></span><span property="sioc:num_replies" content="0" datatype="xsd:integer" class="rdf-meta element-hidden"></span>
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<div class="field field-name-body field-type-text-with-summary field-label-hidden"><div class="field-items"><div class="field-item even" property="content:encoded"><p>The following diagram shows how the <em>Session Negotiation</em> works and which <em>MESSAGES</em> are sent between the Host and the invitee.</p>
<p style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px;"><img alt="" src="sites/saros-project.org/files/architecture_SessionNegotiation.svg.html" style="width: 771px; height: 548px;" /></p>
<p style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px;"> </p>
<p style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px;">The <em>Session Negotiation</em> is started, when the Host invites a user to a session. The <em>User Interface </em>registers this action and starts the <em>Negotiation Process</em>. The <em>Invitation Management</em> of the Host first asks the Client if he has a Saros-instance running and if his version is compatible with the version of the Host. Afterwards he sends an <em>invitationOffering</em> to the Client.</p>
<p style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px;"> </p>
<p style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px;">All <em>MESSAGES</em> are send and received by the <em>Network Layer</em> which communicates with the <em>Invitation Management</em>. The <em>Invitation Management</em> informs the <em>User Interface</em> which then opens a wizard, informing the Client about the invitation. At the same time an acknowledgment is sent back to the Host informing him, that the Client has received the invitation.</p>
<p style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px;"> </p>
<p style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px;">Once the Client accepted the invitation he first sends an <em>invitationAccepted</em> and afterwards tells the host which session parameters he would prefer. These parameters includes for example the desired color.</p>
<p style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px;"> </p>
<p style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px;">The Host evaluates this preferences and sends the actual session parameters back to the Client. With these session parameters the Client then creates a new session and sends the Host a final acknowledgment, to which the Host informs his <em>Session Management</em> that a new user has joined the session.</p>
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