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| <h2 title="Interface QoS" class="title">Interface QoS</h2> |
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| <pre>public interface <span class="typeNameLabel">QoS</span></pre> |
| <div class="block">Device event quality of service levels. |
| The QoS levels match the MQTT specification. |
| <BR> |
| An implementation of <a href="../../../../../org/apache/edgent/connectors/iot/IotDevice.html" title="interface in org.apache.edgent.connectors.iot"><code>IotDevice</code></a> may not |
| support all QoS levels.</div> |
| <dl> |
| <dt><span class="seeLabel">See Also:</span></dt> |
| <dd><a href="http://mqtt.org/">mqtt.org</a>, |
| <a href="../../../../../org/apache/edgent/connectors/iot/IotDevice.html#events-org.apache.edgent.topology.TStream-java.lang.String-int-"><code>IotDevice.events(org.apache.edgent.topology.TStream, String, int)</code></a>, |
| <a href="../../../../../org/apache/edgent/connectors/iot/IotDevice.html#events-org.apache.edgent.topology.TStream-org.apache.edgent.function.Function-org.apache.edgent.function.UnaryOperator-org.apache.edgent.function.Function-"><code>IotDevice.events(org.apache.edgent.topology.TStream, org.apache.edgent.function.Function, org.apache.edgent.function.UnaryOperator, org.apache.edgent.function.Function)</code></a></dd> |
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| <td class="colFirst"><code>static <a href="http://docs.oracle.com/javase/8/docs/api/java/lang/Integer.html?is-external=true" title="class or interface in java.lang">Integer</a></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/edgent/connectors/iot/QoS.html#AT_LEAST_ONCE">AT_LEAST_ONCE</a></span></code> |
| <div class="block">The message containing the event arrives at the message hub at least once.</div> |
| </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colFirst"><code>static <a href="http://docs.oracle.com/javase/8/docs/api/java/lang/Integer.html?is-external=true" title="class or interface in java.lang">Integer</a></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/edgent/connectors/iot/QoS.html#AT_MOST_ONCE">AT_MOST_ONCE</a></span></code> |
| <div class="block">The message containing the event arrives at the message hub either once or not at all.</div> |
| </td> |
| </tr> |
| <tr class="altColor"> |
| <td class="colFirst"><code>static <a href="http://docs.oracle.com/javase/8/docs/api/java/lang/Integer.html?is-external=true" title="class or interface in java.lang">Integer</a></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/edgent/connectors/iot/QoS.html#EXACTLY_ONCE">EXACTLY_ONCE</a></span></code> |
| <div class="block">The message containing the event arrives at the message hub exactly once.</div> |
| </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colFirst"><code>static <a href="http://docs.oracle.com/javase/8/docs/api/java/lang/Integer.html?is-external=true" title="class or interface in java.lang">Integer</a></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/edgent/connectors/iot/QoS.html#FIRE_AND_FORGET">FIRE_AND_FORGET</a></span></code> |
| <div class="block">Fire and forget the event.</div> |
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| <pre>static final <a href="http://docs.oracle.com/javase/8/docs/api/java/lang/Integer.html?is-external=true" title="class or interface in java.lang">Integer</a> AT_MOST_ONCE</pre> |
| <div class="block">The message containing the event arrives at the message hub either once or not at all. |
| <BR> |
| Value is <code>0</code>.</div> |
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| <pre>static final <a href="http://docs.oracle.com/javase/8/docs/api/java/lang/Integer.html?is-external=true" title="class or interface in java.lang">Integer</a> FIRE_AND_FORGET</pre> |
| <div class="block">Fire and forget the event. Synonym for <a href="../../../../../org/apache/edgent/connectors/iot/QoS.html#AT_MOST_ONCE"><code>AT_MOST_ONCE</code></a>. |
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| Value is <code>0</code>.</div> |
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| <pre>static final <a href="http://docs.oracle.com/javase/8/docs/api/java/lang/Integer.html?is-external=true" title="class or interface in java.lang">Integer</a> AT_LEAST_ONCE</pre> |
| <div class="block">The message containing the event arrives at the message hub at least once. |
| The message may be seen at the hub multiple times. |
| <BR> |
| Value is <code>1</code>.</div> |
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| <div class="block">The message containing the event arrives at the message hub exactly once. |
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| Value is <code>2</code>.</div> |
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