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<h2><a href="https://wiki.asterisk.org/wiki/display/TOP/Replication+of+Configuration+Changes">Replication of Configuration Changes</a></h2>
<h4>Page <b>edited</b> by <a href="https://wiki.asterisk.org/wiki/display/~mmichelson">Mark Michelson</a>
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<b>Comment:</b>
Correcting grammar<br />
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<h4>Changes (3)</h4>
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<tr><td class="diff-unchanged" >h3. Overview <br></td></tr>
<tr><td class="diff-changed-lines" >[State Replication|State Replication] and [Configuration|Configuration Pattern] are described on other pages in this section. This <span class="diff-changed-words">page<span class="diff-deleted-chars"style="color:#999;background-color:#fdd;text-decoration:line-through;">s</span></span> describes how configuration is pushed to all components in a replica group (i.e. the active component, and it's related standby component.) <br></td></tr>
<tr><td class="diff-unchanged" > <br>h3. Description <br> <br></td></tr>
<tr><td class="diff-changed-lines" >As seen in Figure 1 below, the StateReplicator will create an IceStorm topic during initialization to enable forwarding ConfigurationService operations to all components within a replica group. The StateReplicator registers a proxy to the topic with the ServiceLocator using the same parameters that the component would have used to register <span class="diff-changed-words">it<span class="diff-deleted-chars"style="color:#999;background-color:#fdd;text-decoration:line-through;">'</span>s</span> ConfigurationService interface if it had been brought up outside of a replica group. <br></td></tr>
<tr><td class="diff-unchanged" > <br>When an Asterisk SCF component is brought up as part of a replica group, it will register its ConfigurationService interface with its StateReplicator rather than directly with the ServiceLocator during initialization. The StateReplicator will subscribe the ConfigurationService proxy to the configuration-related Topic created during initialization. <br> <br></td></tr>
<tr><td class="diff-changed-lines" >After each of the initialization sequence vignettes <span class="diff-deleted-words"style="color:#999;background-color:#fdd;text-decoration:line-through;">have</span> <span class="diff-added-words"style="background-color: #dfd;">has</span> completed, Figure 1 shows the Component's Configurator accessing the ConfigurationService interface from the ServiceLocator. Since the StateReplicator registered the Topic as the ConfigurationService, the configuration data is pushed to all of the components in the replica group, transparently to the Configurator. <br></td></tr>
<tr><td class="diff-unchanged" > <br>While it isn't shown on the diagram, the StateReplicator can add its own listener to the topic, which it would use to maintain a cache of the current configuration state. This cache would be pushed to each component's ConfigurationService interface as part of the registration process in the StateReplicator, before it is subscribed to the topic. This will allow late-joining components to be placed into the same configuration as the components that were initialized prior to any Configurator operation. <br></td></tr>
<tr><td class="diff-snipped" >...<br></td></tr>
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</div> <h4>Full Content</h4>
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<h3><a name="ReplicationofConfigurationChanges-Overview"></a>Overview</h3>
<p><a href="/wiki/display/TOP/State+Replication" title="State Replication">State Replication</a> and <a href="/wiki/display/TOP/Configuration+Pattern" title="Configuration Pattern">Configuration</a> are described on other pages in this section. This page describes how configuration is pushed to all components in a replica group (i.e. the active component, and it's related standby component.) </p>
<h3><a name="ReplicationofConfigurationChanges-Description"></a>Description</h3>
<p>As seen in Figure 1 below, the StateReplicator will create an IceStorm topic during initialization to enable forwarding ConfigurationService operations to all components within a replica group. The StateReplicator registers a proxy to the topic with the ServiceLocator using the same parameters that the component would have used to register its ConfigurationService interface if it had been brought up outside of a replica group. </p>
<p>When an Asterisk SCF component is brought up as part of a replica group, it will register its ConfigurationService interface with its StateReplicator rather than directly with the ServiceLocator during initialization. The StateReplicator will subscribe the ConfigurationService proxy to the configuration-related Topic created during initialization. </p>
<p>After each of the initialization sequence vignettes has completed, Figure 1 shows the Component's Configurator accessing the ConfigurationService interface from the ServiceLocator. Since the StateReplicator registered the Topic as the ConfigurationService, the configuration data is pushed to all of the components in the replica group, transparently to the Configurator. </p>
<p>While it isn't shown on the diagram, the StateReplicator can add its own listener to the topic, which it would use to maintain a cache of the current configuration state. This cache would be pushed to each component's ConfigurationService interface as part of the registration process in the StateReplicator, before it is subscribed to the topic. This will allow late-joining components to be placed into the same configuration as the components that were initialized prior to any Configurator operation. </p>
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<td class='confluenceTd'> <span class="image-wrap" style=""><img src="/wiki/download/attachments/13076604/ConfigReplication.png?version=1&modificationDate=1305241339559" style="border: 1px solid black" /></span> </td>
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<td class='confluenceTd'> <div class="" align="center"><b>Figure 1. Configuration Replication</b></div>
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