Jetstream is a toolkit for the Force.com Streaming API, a Bayeux implementation built on the Force.com platform. Jetstream provides a simple way to configure a connection to the Streaming API. For more information on the Force.com Streaming API, please review the guide.
The following instructions assume some knowledge of the Force.com platform. If you are unfamiliar with Force.com, please visit http://developer.force.com.
- export FORCE_FORCEDATABASE_URL="force://instance.salesforce.com;user=username@org;password=password"
- add the following to your own pom.xml
<dependency>
<groupId>com.force.sdk.streaming</groupId>
<artifactId>streaming</artifactId>
<version>0.12</version>
</dependency> <repositories>
<repository>
<id>repo</id>
<url>https://raw.github.com/naamannewbold/repo/master/releases/</url>
</repository>
</repositories>Jetstream uses Guice for dependency injection. If you wish to use the client directly, add Guice to your pom.xml:
<dependency>
<groupId>com.google.inject</groupId>
<artifactId>guice</artifactId>
<version>3.0</version>
</dependency>Write some Java to handle messages:
Injector injector = Guice.createInjector(new ForceStreamingClientModule());
ForceBayeuxClient client = injector.getInstance(ForceBayeuxClient.class);
PushTopicManager pushTopicManager = injector.getInstance(PushTopicManager.class);
PushTopic topic = pushTopicManager.getTopicByName("products");
client.subscribeTo(topic, new ClientSessionChannel.MessageListener() {
public void onMessage(ClientSessionChannel channel, Message message) {
System.out.println(message.getJSON());
}
});Due to cross-domain limitations, javascript cannot callout to the streaming API unless it's on salesforce.com. This servlet acts as a proxy, allowing javascript to interact with the streaming API.
Add this dependency to your pom.xml
<dependency>
<groupId>com.force.sdk.streaming</groupId>
<artifactId>streaming</artifactId>
<version>0.11</version>
</dependency>Add the cometd and streaming servlets to your web.xml
<servlet>
<servlet-name>cometd</servlet-name>
<servlet-class>org.cometd.server.CometdServlet</servlet-class>
<load-on-startup>1</load-on-startup>
<init-param>
<param-name>timeout</param-name>
<param-value>20000</param-value>
</init-param>
</servlet>
<servlet-mapping>
<servlet-name>cometd</servlet-name>
<url-pattern>/cometd/*</url-pattern>
</servlet-mapping>
<servlet>
<servlet-name>initializer</servlet-name>
<servlet-class>com.force.sdk.streaming.server.ForceStreamingResource</servlet-class>
<load-on-startup>2</load-on-startup>
</servlet>Wire your javascript client to talk to /force/topicName, e.g.
<html>
<head>
<script type="text/javascript" src="/jquery/jquery-1.6.2.js"></script>
<script type="text/javascript" src="/jquery/json2.js"></script>
<script type="text/javascript" src="/org/cometd.js"></script>
<script type="text/javascript" src="/jquery/jquery.cometd.js"></script>
<script type="text/javascript">
(function($)
{
var cometd = $.cometd;
$(document).ready(function()
{
function _metaHandshake(handshake)
{
if (handshake.successful === true)
{
cometd.batch(function()
{
cometd.subscribe('/force/products', function(messages) {
$("body").append('<pre>' + JSON.stringify(messages) + '</pre>');
});
});
}
}
// Disconnect when the page unloads
$(window).unload(function()
{
cometd.disconnect(true);
});
var cometURL = location.protocol + "//" + location.host + "/cometd";
cometd.configure({
url: cometURL
});
cometd.addListener('/meta/handshake', _metaHandshake);
cometd.handshake();
});
})(jQuery);
</script>
</head>
<body>
</body>
</html>
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