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From "Henryk Konsek (Confluence)" <conflue...@apache.org>
Subject [CONF] Apache Camel > JGroups
Date Tue, 07 Jan 2014 20:19:00 GMT
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                                                            <a href="    https://cwiki.apache.org/confluence/display/~hekonsek
" style="color:#326ca6;text-decoration:none;; color: #326ca6; text-decoration: none">Henryk
Konsek</a> edited the page:
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                                                    <td valign="top" style="font-size:
13px"> <h2 id="email-title-heading" style="font-size: 16px; line-height: 20px; min-height:
20px; margin: 0; padding: 0"> <a href="https://cwiki.apache.org/confluence/display/CAMEL/JGroups"
style="color: #326ca6; text-decoration: none"> <img class="icon" src="cid:page-icon"
alt="" style="border: 0; padding: 0 5px 0 0; text-align: left; vertical-align: middle" />
<strong style="font-size:16px;line-height:20px;vertical-align:top;">JGroups</strong>
</a> </h2> </td>
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<b>Comment:</b> [JGroups] Added conditional delaying information </p>
                                            <div class="email-diff">
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;line-height: 20px;"><img src="https://cwiki.apache.org/confluence/s/en_GB-1988229788/4109/76e0dbb30bc8580e459c201f3535d84f9283a9ac.1/_/plugins/servlet/confluence/placeholder/macro-icon?name=code"
style="padding-right: 5px; vertical-align: text-bottom;" /> </span>Code Block</th>
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#fafafa; padding: 0 0 0 5px; font-size: 12px; text-align: left;; font-size: 13px"></td>
                                                                                <td style="background-color:
#fafafa; padding: 0 0 0 5px; font-size: 12px; text-align: left;; font-size: 13px">java</td>
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                                                                <td class="diff-macro-body"
style="background-color: #fff;border: 1px solid #dddddd;padding: 10px;; font-size: 13px">
<pre style="font-size: 13px">import static org.apache.camel.component.jgroups.JGroupsFilters.dropNonCoordinatorViews;
...
from(&quot;jgroups:clusterName?enableViewMessages=true&quot;).
  filter(dropNonCoordinatorViews()).
  to(&quot;seda:masterNodeEventsQueue&quot;);
</pre> </td>
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                                                    <h3 id="JGroups-Predefinedexpressions"
class="diff-block-target diff-block-context"> <span class="diff-html-added" id="added-diff-0"
style="font-size: 100%; background-color: #ddfade;">Predefined expressions</span>
</h3>
                                                    <p class="diff-block-target diff-block-context"
style="font-size: 13px"> <span class="diff-html-added" style="font-size: 100%; background-color:
#ddfade;">JGroups component comes with predefined expressions factory class named </span><code
style="font-size: 13px"><span class="diff-html-added" style="font-size: 100%; background-color:
#ddfade;">JGroupsExpressions.</span></code> </p>
                                                    <p class="diff-block-target diff-block-context"
style="font-size: 13px"> <span class="diff-html-added" style="font-size: 100%; background-color:
#ddfade;">If you would like to create </span><a class="confluence-link unresolved"
href="#" style="color: #326ca6; text-decoration: none"><span class="diff-html-added"
style="font-size: 100%; background-color: #ddfade;">delayer</span></a><span
class="diff-html-added" style="font-size: 100%; background-color: #ddfade;"> that would
affect the route only if the Camel context has not been started yet, use the </span><code
style="font-size: 13px"><span class="diff-html-added" style="font-size: 100%; background-color:
#ddfade;">JGroupsExpressions.delayIfContextNotStarted(long delay)</span></code><span
class="diff-html-added" style="font-size: 100%; background-color: #ddfade;"> factory method.
The expression created by this factory method will return given delay value only if the Camel
context is in the state different than </span><code style="font-size: 13px"><span
class="diff-html-added" style="font-size: 100%; background-color: #ddfade;">started</span></code><span
class="diff-html-added" style="font-size: 100%; background-color: #ddfade;">. This expression
is particularly useful if you would like to use JGroups component for keeping singleton (master)
route within the cluster. </span><a class="confluence-link unresolved" href="#" style="color:
#326ca6; text-decoration: none"><span class="diff-html-added" style="font-size: 100%;
background-color: #ddfade;">Control Bus</span></a><span class="diff-html-added"
style="font-size: 100%; background-color: #ddfade;"> </span><code style="font-size:
13px"><span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;">start</span></code><span
class="diff-html-added" style="font-size: 100%; background-color: #ddfade;"> command won't
initialize the singleton route if the Camel Context hasn't been yet started. So you need to
delay a startup of the master route, to be sure that it has been initialized after the Camel
Context startup. Because such scenario can happen only during the initialization of the cluster,
we don't want to delay startup of the slave node becoming the new master - that's why we need
a conditional delay expression.</span> </p>
                                                    <p class="diff-block-target diff-block-context"
style="font-size: 13px"> <span class="diff-html-added" style="font-size: 100%; background-color:
#ddfade;">The snippet below demonstrates how to use conditional delaying with the JGroups
component to delay the initial startup of master node in the cluster.</span> </p>
                                                    <table class="diff-macro diff-html-added
diff-block-target diff-block-context" style="background-color: #f0f0f0;border: 1px solid #dddddd;margin:
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style="background-color: transparent; text-align: left; font-weight: normal;padding: 5px;;
font-size: 13px"><span class="diff-html-added" style="font-size: 100%; background-color:
#ddfade;"><span class="icon macro-placeholder-icon" style="background-color: ;line-height:
20px;"><img src="https://cwiki.apache.org/confluence/s/en_GB-1988229788/4109/76e0dbb30bc8580e459c201f3535d84f9283a9ac.1/_/plugins/servlet/confluence/placeholder/macro-icon?name=code"
style="padding-right: 5px; vertical-align: text-bottom;" /> </span>Code Block</span></th>
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0; border: 1px solid #dddddd;; font-size: 13px">
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#fafafa; padding: 0 0 0 5px; font-size: 12px; text-align: left;; font-size: 13px"></td>
                                                                                <td style="background-color:
#fafafa; padding: 0 0 0 5px; font-size: 12px; text-align: left;; font-size: 13px"><span
class="diff-html-added" style="font-size: 100%; background-color: #ddfade;">java</span></td>
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<pre style="font-size: 13px">
<span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;">import
static java.util.concurrent.TimeUnit.SECONDS;
import static org.apache.camel.component.jgroups.JGroupsExpressions.delayIfContextNotStarted;
import static org.apache.camel.component.jgroups.JGroupsFilters.dropNonCoordinatorViews;
...
from(&quot;jgroups:clusterName?enableViewMessages=true&quot;).
  filter(dropNonCoordinatorViews()).
  threads().delay(delayIfContextNotStarted(SECONDS.toMillis(5))). // run in separated and
delayed thread. Delay only if the context hasn't been started already.
 &nbsp;to(&quot;controlbus:route?routeId=masterRoute&amp;action=start&amp;async=true&quot;);

from(&quot;timer://master?repeatCount=1&quot;).routeId(&quot;masterRoute&quot;).autoStartup(false).to(masterMockUri);&nbsp;</span>
</pre> </td>
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                                                    </table>
                                                    <h3 id="JGroups-Examples" class="diff-block-context">Examples</h3>
                                                    <h4 id="JGroups-Receiveclusterviewchangenotifications"
class="diff-block-context">Receive cluster view change notifications</h4>
                                                    <p class="diff-context-placeholder"
style="font-size: 13px">...</p>
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