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| <pre>public class <span class="typeNameLabel">HeartBeat</span> |
| extends java.lang.Object</pre> |
| <div class="block">An IoT device heartbeat event generator.</div> |
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| <td class="colFirst"><code>static <a href="../../../../../org/apache/edgent/topology/TStream.html" title="interface in org.apache.edgent.topology">TStream</a><com.google.gson.JsonObject></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/edgent/connectors/iot/HeartBeat.html#addHeartBeat-org.apache.edgent.connectors.iot.IotDevice-long-java.util.concurrent.TimeUnit-java.lang.String-">addHeartBeat</a></span>(<a href="../../../../../org/apache/edgent/connectors/iot/IotDevice.html" title="interface in org.apache.edgent.connectors.iot">IotDevice</a> iotDevice, |
| long period, |
| java.util.concurrent.TimeUnit unit, |
| java.lang.String eventId)</code> |
| <div class="block">Add IoT device heart beat processing to a topology.</div> |
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| <h4>addHeartBeat</h4> |
| <pre>public static <a href="../../../../../org/apache/edgent/topology/TStream.html" title="interface in org.apache.edgent.topology">TStream</a><com.google.gson.JsonObject> addHeartBeat(<a href="../../../../../org/apache/edgent/connectors/iot/IotDevice.html" title="interface in org.apache.edgent.connectors.iot">IotDevice</a> iotDevice, |
| long period, |
| java.util.concurrent.TimeUnit unit, |
| java.lang.String eventId)</pre> |
| <div class="block">Add IoT device heart beat processing to a topology. |
| <P> |
| An IoTDevice event containing heart beat information |
| is periodically published to the specified <code>eventId</code>. |
| </P> |
| <P> |
| The heart beat provides clients of the IoT hub with liveness information |
| about the device and its connection to the hub. |
| </P> |
| <P> |
| The heart beat also ensures there is some immediate output so |
| the connection to the IoT hub happens as soon as possible. |
| In the case where there may not otherwise be |
| IoT events to publish, a heart beat ensures a connection |
| to the IoT hub is maintained. |
| </P> |
| <P> |
| The heart beat's event payload is the JSON for a JsonObject with the |
| heart beat's properties: |
| <ul> |
| <li>"when" : (string) ISO8601 UTC date/time. e.g. "2016-07-12T17:57:08Z"</li> |
| <li>"time" : (number) <code>System.currentTimeMillis()</code></li> |
| </ul></div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>iotDevice</code> - IoT hub device</dd> |
| <dd><code>period</code> - the heart beat period</dd> |
| <dd><code>unit</code> - TimeUnit for the period</dd> |
| <dd><code>eventId</code> - the IotDevice eventId to use for the event</dd> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>the <code>TStream<JsonObject></code> heartbeat stream</dd> |
| </dl> |
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