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| Introduction |
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| <b>1.</b> |
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| Legal Notice |
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| <b>2.</b> |
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| Preface |
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| <b>3.</b> |
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| Project Info |
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| <b>4.</b> |
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| Messaging Concepts |
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| <li class="chapter " data-level="5" data-path="architecture.html"> |
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| <b>5.</b> |
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| Architecture |
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| <a href="./using-server.html"> |
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| <b>6.</b> |
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| Using the Server |
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| <li class="chapter " data-level="7" data-path="using-jms.html"> |
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| <a href="./using-jms.html"> |
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| <b>7.</b> |
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| Using JMS |
| </a> |
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| </li> |
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| <li class="chapter " data-level="8" data-path="using-core.html"> |
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| <a href="./using-core.html"> |
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| <b>8.</b> |
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| Using Core |
| </a> |
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| </li> |
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| <li class="chapter " data-level="9" data-path="jms-core-mapping.html"> |
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| <a href="./jms-core-mapping.html"> |
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| <b>9.</b> |
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| Mapping JMS Concepts to the Core API |
| </a> |
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| </li> |
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| <li class="chapter " data-level="10" data-path="client-classpath.html"> |
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| <a href="./client-classpath.html"> |
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| <b>10.</b> |
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| The Client Classpath |
| </a> |
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| </li> |
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| <li class="chapter " data-level="11" data-path="examples.html"> |
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| <a href="./examples.html"> |
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| <b>11.</b> |
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| Examples |
| </a> |
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| </li> |
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| <li class="chapter " data-level="12" data-path="wildcard-routing.html"> |
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| <a href="./wildcard-routing.html"> |
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| <b>12.</b> |
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| Routing Messages With Wild Cards |
| </a> |
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| </li> |
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| <li class="chapter " data-level="13" data-path="wildcard-syntax.html"> |
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| <a href="./wildcard-syntax.html"> |
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| <b>13.</b> |
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| Understanding the Apache ActiveMQ Artemis Wildcard Syntax |
| </a> |
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| </li> |
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| <li class="chapter " data-level="14" data-path="filter-expressions.html"> |
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| <a href="./filter-expressions.html"> |
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| <b>14.</b> |
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| Filter Expressions |
| </a> |
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| </li> |
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| <li class="chapter " data-level="15" data-path="persistence.html"> |
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| <a href="./persistence.html"> |
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| <b>15.</b> |
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| Persistence |
| </a> |
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| </li> |
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| <li class="chapter " data-level="16" data-path="configuring-transports.html"> |
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| <a href="./configuring-transports.html"> |
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| <b>16.</b> |
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| Configuring Transports |
| </a> |
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| </li> |
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| <li class="chapter " data-level="17" data-path="connection-ttl.html"> |
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| <a href="./connection-ttl.html"> |
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| <b>17.</b> |
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| Detecting Dead Connections |
| </a> |
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| </li> |
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| <li class="chapter " data-level="18" data-path="slow-consumers.html"> |
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| <a href="./slow-consumers.html"> |
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| <b>18.</b> |
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| Detecting Slow Consumers |
| </a> |
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| </li> |
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| <li class="chapter " data-level="19" data-path="transaction-config.html"> |
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| <a href="./transaction-config.html"> |
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| <b>19.</b> |
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| Resource Manager Configuration |
| </a> |
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| </li> |
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| <li class="chapter " data-level="20" data-path="flow-control.html"> |
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| <a href="./flow-control.html"> |
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| <b>20.</b> |
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| Flow Control |
| </a> |
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| </li> |
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| <li class="chapter " data-level="21" data-path="send-guarantees.html"> |
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| <a href="./send-guarantees.html"> |
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| <b>21.</b> |
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| Guarantees of sends and commits |
| </a> |
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| </li> |
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| <li class="chapter " data-level="22" data-path="undelivered-messages.html"> |
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| <a href="./undelivered-messages.html"> |
| <i class="fa fa-check"></i> |
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| <b>22.</b> |
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| Message Redelivery and Undelivered Messages |
| </a> |
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| </li> |
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| <li class="chapter " data-level="23" data-path="message-expiry.html"> |
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| <a href="./message-expiry.html"> |
| <i class="fa fa-check"></i> |
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| <b>23.</b> |
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| Message Expiry |
| </a> |
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| </li> |
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| <li class="chapter " data-level="24" data-path="large-messages.html"> |
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| <a href="./large-messages.html"> |
| <i class="fa fa-check"></i> |
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| <b>24.</b> |
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| Large Messages |
| </a> |
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| </li> |
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| <li class="chapter " data-level="25" data-path="paging.html"> |
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| <a href="./paging.html"> |
| <i class="fa fa-check"></i> |
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| <b>25.</b> |
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| Paging |
| </a> |
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| </li> |
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| <li class="chapter " data-level="26" data-path="queue-attributes.html"> |
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| <a href="./queue-attributes.html"> |
| <i class="fa fa-check"></i> |
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| <b>26.</b> |
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| Queue Attributes |
| </a> |
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| </li> |
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| <li class="chapter " data-level="27" data-path="scheduled-messages.html"> |
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| <a href="./scheduled-messages.html"> |
| <i class="fa fa-check"></i> |
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| <b>27.</b> |
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| Scheduled Messages |
| </a> |
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| </li> |
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| <li class="chapter " data-level="28" data-path="last-value-queues.html"> |
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| <a href="./last-value-queues.html"> |
| <i class="fa fa-check"></i> |
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| <b>28.</b> |
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| Last-Value Queues |
| </a> |
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| </li> |
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| <li class="chapter " data-level="29" data-path="message-grouping.html"> |
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| <a href="./message-grouping.html"> |
| <i class="fa fa-check"></i> |
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| <b>29.</b> |
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| Message Grouping |
| </a> |
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| </li> |
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| <li class="chapter " data-level="30" data-path="pre-acknowledge.html"> |
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| <a href="./pre-acknowledge.html"> |
| <i class="fa fa-check"></i> |
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| <b>30.</b> |
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| Extra Acknowledge Modes |
| </a> |
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| </li> |
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| <li class="chapter " data-level="31" data-path="management.html"> |
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| <a href="./management.html"> |
| <i class="fa fa-check"></i> |
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| <b>31.</b> |
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| Management |
| </a> |
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| </li> |
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| <li class="chapter " data-level="32" data-path="security.html"> |
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| <a href="./security.html"> |
| <i class="fa fa-check"></i> |
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| <b>32.</b> |
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| Security |
| </a> |
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| </li> |
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| <li class="chapter " data-level="33" data-path="resource-limits.html"> |
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| <a href="./resource-limits.html"> |
| <i class="fa fa-check"></i> |
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| <b>33.</b> |
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| Resource Limits |
| </a> |
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| </li> |
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| <li class="chapter " data-level="34" data-path="jms-bridge.html"> |
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| <a href="./jms-bridge.html"> |
| <i class="fa fa-check"></i> |
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| <b>34.</b> |
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| The JMS Bridge |
| </a> |
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| </li> |
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| <li class="chapter " data-level="35" data-path="client-reconnection.html"> |
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| <a href="./client-reconnection.html"> |
| <i class="fa fa-check"></i> |
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| <b>35.</b> |
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| Client Reconnection and Session Reattachment |
| </a> |
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| </li> |
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| <li class="chapter " data-level="36" data-path="diverts.html"> |
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| <a href="./diverts.html"> |
| <i class="fa fa-check"></i> |
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| <b>36.</b> |
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| Diverting and Splitting Message Flows |
| </a> |
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| </li> |
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| <li class="chapter " data-level="37" data-path="core-bridges.html"> |
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| <a href="./core-bridges.html"> |
| <i class="fa fa-check"></i> |
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| <b>37.</b> |
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| Core Bridges |
| </a> |
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| </li> |
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| <li class="chapter " data-level="38" data-path="duplicate-detection.html"> |
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| <a href="./duplicate-detection.html"> |
| <i class="fa fa-check"></i> |
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| <b>38.</b> |
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| Duplicate Message Detection |
| </a> |
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| </li> |
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| <li class="chapter " data-level="39" data-path="clusters.html"> |
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| <a href="./clusters.html"> |
| <i class="fa fa-check"></i> |
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| <b>39.</b> |
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| Clusters |
| </a> |
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| </li> |
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| <li class="chapter " data-level="40" data-path="ha.html"> |
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| <a href="./ha.html"> |
| <i class="fa fa-check"></i> |
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| <b>40.</b> |
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| High Availability and Failover |
| </a> |
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| </li> |
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| <li class="chapter " data-level="41" data-path="graceful-shutdown.html"> |
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| <a href="./graceful-shutdown.html"> |
| <i class="fa fa-check"></i> |
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| <b>41.</b> |
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| Graceful Server Shutdown |
| </a> |
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| </li> |
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| <li class="chapter " data-level="42" data-path="libaio.html"> |
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| <a href="./libaio.html"> |
| <i class="fa fa-check"></i> |
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| <b>42.</b> |
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| Libaio Native Libraries |
| </a> |
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| </li> |
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| <li class="chapter " data-level="43" data-path="thread-pooling.html"> |
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| <a href="./thread-pooling.html"> |
| <i class="fa fa-check"></i> |
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| <b>43.</b> |
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| Thread management |
| </a> |
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| </li> |
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| <li class="chapter " data-level="44" data-path="logging.html"> |
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| <a href="./logging.html"> |
| <i class="fa fa-check"></i> |
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| <b>44.</b> |
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| Logging |
| </a> |
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| </li> |
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| <li class="chapter " data-level="45" data-path="rest.html"> |
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| <a href="./rest.html"> |
| <i class="fa fa-check"></i> |
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| <b>45.</b> |
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| REST Interface |
| </a> |
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| </li> |
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| <li class="chapter " data-level="46" data-path="embedding-activemq.html"> |
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| <a href="./embedding-activemq.html"> |
| <i class="fa fa-check"></i> |
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| <b>46.</b> |
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| Embedding Apache ActiveMQ Artemis |
| </a> |
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| </li> |
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| <li class="chapter " data-level="47" data-path="spring-integration.html"> |
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| <a href="./spring-integration.html"> |
| <i class="fa fa-check"></i> |
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| <b>47.</b> |
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| Spring Integration |
| </a> |
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| </li> |
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| <li class="chapter " data-level="48" data-path="aerogear-integration.html"> |
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| <a href="./aerogear-integration.html"> |
| <i class="fa fa-check"></i> |
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| <b>48.</b> |
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| AeroGear Integration |
| </a> |
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| </li> |
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| <li class="chapter " data-level="49" data-path="vertx-integration.html"> |
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| <a href="./vertx-integration.html"> |
| <i class="fa fa-check"></i> |
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| <b>49.</b> |
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| VertX Integration |
| </a> |
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| </li> |
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| <li class="chapter " data-level="50" data-path="intercepting-operations.html"> |
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| <a href="./intercepting-operations.html"> |
| <i class="fa fa-check"></i> |
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| <b>50.</b> |
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| Intercepting Operations |
| </a> |
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| </li> |
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| <li class="chapter active" data-level="51" data-path="protocols-interoperability.html"> |
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| <a href="./protocols-interoperability.html"> |
| <i class="fa fa-check"></i> |
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| <b>51.</b> |
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| Protocols and Interoperability |
| </a> |
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| </li> |
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| <li class="chapter " data-level="52" data-path="tools.html"> |
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| <a href="./tools.html"> |
| <i class="fa fa-check"></i> |
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| <b>52.</b> |
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| Tools |
| </a> |
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| </li> |
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| <li class="chapter " data-level="53" data-path="maven-plugin.html"> |
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| <a href="./maven-plugin.html"> |
| <i class="fa fa-check"></i> |
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| <b>53.</b> |
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| Maven Plugin |
| </a> |
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| </li> |
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| <li class="chapter " data-level="54" data-path="perf-tuning.html"> |
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| <a href="./perf-tuning.html"> |
| <i class="fa fa-check"></i> |
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| <b>54.</b> |
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| Troubleshooting and Performance Tuning |
| </a> |
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| |
| |
| </li> |
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| <li class="chapter " data-level="55" data-path="configuration-index.html"> |
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| |
| <a href="./configuration-index.html"> |
| <i class="fa fa-check"></i> |
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| <b>55.</b> |
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| Configuration Reference |
| </a> |
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| </li> |
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| <!-- Title --> |
| <h1> |
| <i class="fa fa-circle-o-notch fa-spin"></i> |
| <a href="./" >ActiveMQ Artemis Documentation</a> |
| </h1> |
| </div> |
| |
| <div class="page-wrapper" tabindex="-1"> |
| <div class="page-inner"> |
| |
| |
| <section class="normal" id="section-"> |
| |
| <h1 id="protocols-and-interoperability">Protocols and Interoperability</h1> |
| <h2 id="protocols">Protocols</h2> |
| <p>ActiveMQ Artemis has a plugable protocol architecture. Protocol plugins come in the form of ActiveMQ Artemis protocol |
| modules. Each protocol module should be added to the brokers class path and are loaded by the broker at boot time. |
| ActiveMQ Artemis ships with 5 protocol modules out of the box. The 5 modules offer support for the following protocols:</p> |
| <ul> |
| <li>AMQP</li> |
| <li>OpenWire</li> |
| <li>MQTT</li> |
| <li>STOMP</li> |
| <li>HornetQ</li> |
| </ul> |
| <p>In addition to the protocols above ActiveMQ Artemis also offers support for it's own highly performant native protocol |
| "Core".</p> |
| <h2 id="configuring-protocols">Configuring protocols</h2> |
| <p>In order to make use of a particular protocol, a transport must be configured with the desired protocol enabled. There |
| is a whole section on configuring transports that can be found <a href="configuring-transports.html">here</a>.</p> |
| <p>The default configuration shipped with the ActiveMQ Artemis distribution comes with a number of acceptors already |
| defined, one for each of the above protocols plus a generic acceptor that supports all protocols. To enable a |
| protocol on a particular acceptor simply add a url parameter "protocol=AMQP,STOMP" to the acceptor url. Where the value |
| of the parameter is a comma separated list of protocol names. If the protocol parameter is ommited from the url all |
| protocols are enabled.</p> |
| <pre><code><!-- The following example enables only MQTT on port 1883 --> |
| <acceptors> |
| <acceptor>tcp://localhost:1883?protocols=MQTT</acceptor> |
| </acceptors> |
| |
| <!-- The following example enables MQTT and AMQP on port 61617 --> |
| <acceptors> |
| <acceptor>tcp://localhost:1883?protocols=MQTT,AMQP</acceptor> |
| </acceptors> |
| |
| <!-- The following example enables all protocols on 61616 --> |
| <acceptors> |
| <acceptor>tcp://localhost:61616</acceptor> |
| </acceptors> |
| </code></pre><h2 id="amqp">AMQP</h2> |
| <p>Apache ActiveMQ Artemis supports the <a href="https://www.oasis-open.org/committees/tc_home.php?wg_abbrev=amqp" target="_blank">AMQP |
| 1.0</a> |
| specification. To enable AMQP you must configure a Netty Acceptor to |
| receive AMQP clients, like so:</p> |
| <pre><code><acceptor name="amqp-acceptor">tcp://localhost:5672?protocols=AMQP</acceptor> |
| </code></pre><p>Apache ActiveMQ Artemis will then accept AMQP 1.0 clients on port 5672 which is the |
| default AMQP port.</p> |
| <p>There are 2 AMQP examples available see proton-j and proton-ruby which |
| use the qpid Java and Ruby clients respectively.</p> |
| <h3 id="amqp-and-security">AMQP and security</h3> |
| <p>The Apache ActiveMQ Artemis Server accepts AMQP SASL Authentication and will use this |
| to map onto the underlying session created for the connection so you can |
| use the normal Apache ActiveMQ Artemis security configuration.</p> |
| <h3 id="amqp-links">AMQP Links</h3> |
| <p>An AMQP Link is a uni directional transport for messages between a |
| source and a target, i.e. a client and the Apache ActiveMQ Artemis Broker. A link will |
| have an endpoint of which there are 2 kinds, a Sender and A Receiver. At |
| the Broker a Sender will have its messages converted into an Apache ActiveMQ Artemis |
| Message and forwarded to its destination or target. A Receiver will map |
| onto an Apache ActiveMQ Artemis Server Consumer and convert Apache ActiveMQ Artemis messages back into |
| AMQP messages before being delivered.</p> |
| <h3 id="amqp-and-destinations">AMQP and destinations</h3> |
| <p>If an AMQP Link is dynamic then a temporary queue will be created and |
| either the remote source or remote target address will be set to the |
| name of the temporary queue. If the Link is not dynamic then the the |
| address of the remote target or source will used for the queue. If this |
| does not exist then an exception will be sent</p> |
| <blockquote> |
| <p><strong>Note</strong></p> |
| <p>For the next version we will add a flag to aut create durable queue |
| but for now you will have to add them via the configuration</p> |
| </blockquote> |
| <h3 id="amqp-and-coordinations-handling-transactions">AMQP and Coordinations - Handling Transactions</h3> |
| <p>An AMQP links target can also be a Coordinator, the Coordinator is used |
| to handle transactions. If a coordinator is used the the underlying |
| HormetQ Server session will be transacted and will be either rolled back |
| or committed via the coordinator.</p> |
| <blockquote> |
| <p><strong>Note</strong></p> |
| <p>AMQP allows the use of multiple transactions per session, |
| <code>amqp:multi-txns-per-ssn</code>, however in this version Apache ActiveMQ Artemis will only |
| support single transactions per session</p> |
| </blockquote> |
| <h2 id="openwire">OpenWire</h2> |
| <p>Apache ActiveMQ Artemis now supports the |
| <a href="http://activemq.apache.org/openwire.html" target="_blank">OpenWire</a> protocol so that an |
| Apache ActiveMQ Artemis JMS client can talk directly to an Apache ActiveMQ Artemis server. To enable |
| OpenWire support you must configure a Netty Acceptor, like so:</p> |
| <pre><code><acceptor name="openwire-acceptor">tcp://localhost:61616?protocols=OPENWIRE</acceptor> |
| </code></pre><p>The Apache ActiveMQ Artemis server will then listens on port 61616 for incoming |
| openwire commands. Please note the "protocols" is not mandatory here. |
| The openwire configuration conforms to Apache ActiveMQ Artemis's "Single Port" feature. |
| Please refer to <a href="#configuring-transports.single-port">Configuring Single |
| Port</a> for details.</p> |
| <p>Please refer to the openwire example for more coding details.</p> |
| <p>Currently we support Apache ActiveMQ Artemis clients that using standard JMS APIs. In |
| the future we will get more supports for some advanced, Apache ActiveMQ Artemis |
| specific features into Apache ActiveMQ Artemis.</p> |
| <h2 id="mqtt">MQTT</h2> |
| <p>MQTT is a light weight, client to server, publish / subscribe messaging protocol. MQTT has been specifically |
| designed to reduce transport overhead (and thus network traffic) and code footprint on client devices. |
| For this reason MQTT is ideally suited to constrained devices such as sensors and actuators and is quickly |
| becoming the defacto standard communication protocol for IoT.</p> |
| <p>Apache ActiveMQ Artemis supports MQTT v3.1.1 (and also the older v3.1 code message format). To enable MQTT, |
| simply add an appropriate acceptor with the MQTT protocol enabled. For example:</p> |
| <pre><code><acceptor name="mqtt">tcp://localhost:1883?protocols=MQTT</acceptor> |
| </code></pre><p>By default the configuration shipped with Apache ActiveMQ Artemis has the above acceptor already defined, MQTT is |
| also active by default on the generic acceptor defined on port 61616 (where all protocols are enabled), in the out |
| of the box configuration.</p> |
| <p>The best source of information on the MQTT protocol is in the specification. The MQTT v3.1.1 specification can |
| be downloaded from the OASIS website here: <a href="http://docs.oasis-open.org/mqtt/mqtt/v3.1.1/os/mqtt-v3.1.1-os.html" target="_blank">http://docs.oasis-open.org/mqtt/mqtt/v3.1.1/os/mqtt-v3.1.1-os.html</a></p> |
| <p>Some note worthy features of MQTT are explained below:</p> |
| <h3 id="mqtt-quality-of-service">MQTT Quality of Service</h3> |
| <p>MQTT offers 3 quality of service levels.</p> |
| <p>Each message (or topic subscription) can define a quality of service that is associated with it. The quality of service |
| level defined on a topic is the maximum level a client is willing to accept. The quality of service level on a |
| message is the desired quality of service level for this message. The broker will attempt to deliver messages to |
| subscribers at the highest quality of service level based on what is defined on the message and topic subscription.</p> |
| <p>Each quality of service level offers a level of guarantee by which a message is sent or received:</p> |
| <ul> |
| <li><p>QoS 0: AT MOST ONCE: Guarantees that a particular message is only ever received by the subscriber a maximum of one time. |
| This does mean that the message may never arrive. The sender and the receiver will attempt to deliver the message, |
| but if something fails and the message does not reach it's destination (say due to a network connection) the message |
| may be lost. This QoS has the least network traffic overhead and the least burden on the client and the broker and is often |
| useful for telemetry data where it doesn't matter if some of the data is lost.</p> |
| </li> |
| <li><p>QoS 1: AT LEAST ONCE: Guarentees that a message will reach it's intended recipient one or more times. The sender will |
| continue to send the message until it receives an acknowledgment from the recipient, confirming it has received the message. |
| The result of this QoS is that the recipient may receive the message multiple times, and also increases the network |
| overhead than QoS 0, (due to acks). In addition more burden is placed on the sender as it needs to store the message |
| and retry should it fail to receive an ack in a reasonable time.</p> |
| </li> |
| <li><p>QoS 2: EXACTLY ONCE: The most costly of the QoS (in terms of network traffic and burden on sender and receiver) this |
| QoS will ensure that the message is received by a recipient exactly one time. This ensures that the receiver never gets |
| any duplicate copies of the message and will eventually get it, but at the extra cost of network overhead and complexity |
| required on the sender and receiver.</p> |
| </li> |
| </ul> |
| <h3 id="mqtt-retain-messages">MQTT Retain Messages</h3> |
| <p>MQTT has an interesting feature in which messages can be "retained" for a particular address. This means that once a |
| retain message has been sent to an address, any new subscribers to that address will receive the last sent retain |
| message before any others messages, this happens even if the retained message was sent before a client has connected |
| or subscribed. An example of where this feature might be useful is in environments such as IoT where devices need to |
| quickly get the current state of a system when they are on boarded into a system.</p> |
| <h3 id="will-messages">Will Messages</h3> |
| <p>A will message can be sent when a client initially connects to a broker. Clients are able to set a "will |
| message" as part of the connect packet. If the client abnormally disconnects, say due to a device or network failure |
| the broker will proceed to publish the will message to the specified address (as defined also in the connect packet). |
| Other subscribers to the will topic will receive the will message and can react accordingly. This feature can be useful |
| in an IoT style scenario to detect errors across a potentially large scale deployment of devices.</p> |
| <h3 id="wild-card-subscriptions">Wild card subscriptions</h3> |
| <p>MQTT addresses are hierarchical much like a file system, and use "/" charactor to separate heirarchical levels. |
| Subscribers are able to subscribe to specific topics or to whole branches of a heirarchy.</p> |
| <p>To subscribe to branches of an address hierarchy a subscriber can use wild cards.</p> |
| <p>There are 2 types of wild card in MQTT:</p> |
| <ul> |
| <li><p>"#" Multi level wild card. Adding this wild card to an address would match all branches of the address heirarchy |
| under a specified node. For example: /uk/# Would match /uk/cities, /uk/cities/newcastle and also /uk/rivers/tyne. |
| Subscribing to an address "#" would result in subscribing to all topics in the broker. This can be useful, but should |
| be done so with care since it has significant performance implications.</p> |
| </li> |
| <li><p>"+" Single level wild card. Matches a single level in the address hierarchy. For example /uk/+/stores would |
| match /uk/newcastle/stores but not /uk/cities/newcastle/stores.</p> |
| </li> |
| </ul> |
| <h2 id="stomp">Stomp</h2> |
| <p><a href="http://stomp.github.com/" target="_blank">Stomp</a> is a text-orientated wire protocol |
| that allows Stomp clients to communicate with Stomp Brokers. Apache ActiveMQ Artemis |
| now supports Stomp 1.0, 1.1 and 1.2.</p> |
| <p>Stomp clients are available for several languages and platforms making |
| it a good choice for interoperability.</p> |
| <h2 id="native-stomp-support">Native Stomp support</h2> |
| <p>Apache ActiveMQ Artemis provides native support for Stomp. To be able to send and |
| receive Stomp messages, you must configure a <code>NettyAcceptor</code> with a |
| <code>protocols</code> parameter set to have <code>stomp</code>:</p> |
| <pre><code><acceptor name="stomp-acceptor">tcp://localhost:61613?protocols=STOMP</acceptor> |
| </code></pre><p>With this configuration, Apache ActiveMQ Artemis will accept Stomp connections on the |
| port <code>61613</code> (which is the default port of the Stomp brokers).</p> |
| <p>See the <code>stomp</code> example which shows how to configure an Apache ActiveMQ Artemis server |
| with Stomp.</p> |
| <h3 id="limitations">Limitations</h3> |
| <p>Message acknowledgements are not transactional. The ACK frame can not be |
| part of a transaction (it will be ignored if its <code>transaction</code> header is |
| set).</p> |
| <h3 id="stomp-1-1-1-2-notes">Stomp 1.1/1.2 Notes</h3> |
| <h4 id="virtual-hosting">Virtual Hosting</h4> |
| <p>Apache ActiveMQ Artemis currently doesn't support virtual hosting, which means the |
| 'host' header in CONNECT fram will be ignored.</p> |
| <h4 id="heart-beating">Heart-beating</h4> |
| <p>Apache ActiveMQ Artemis specifies a minimum value for both client and server heart-beat |
| intervals. The minimum interval for both client and server heartbeats is |
| 500 milliseconds. That means if a client sends a CONNECT frame with |
| heartbeat values lower than 500, the server will defaults the value to |
| 500 milliseconds regardless the values of the 'heart-beat' header in the |
| frame.</p> |
| <h3 id="mapping-stomp-destinations-to-apache-activemq-artemis-addresses-and-queues">Mapping Stomp destinations to Apache ActiveMQ Artemis addresses and queues</h3> |
| <p>Stomp clients deals with <em>destinations</em> when sending messages and |
| subscribing. Destination names are simply strings which are mapped to |
| some form of destination on the server - how the server translates these |
| is left to the server implementation.</p> |
| <p>In Apache ActiveMQ Artemis, these destinations are mapped to <em>addresses</em> and <em>queues</em>. |
| When a Stomp client sends a message (using a <code>SEND</code> frame), the |
| specified destination is mapped to an address. When a Stomp client |
| subscribes (or unsubscribes) for a destination (using a <code>SUBSCRIBE</code> or |
| <code>UNSUBSCRIBE</code> frame), the destination is mapped to an Apache ActiveMQ Artemis queue.</p> |
| <h3 id="stomp-and-connection-ttl">STOMP and connection-ttl</h3> |
| <p>Well behaved STOMP clients will always send a DISCONNECT frame before |
| closing their connections. In this case the server will clear up any |
| server side resources such as sessions and consumers synchronously. |
| However if STOMP clients exit without sending a DISCONNECT frame or if |
| they crash the server will have no way of knowing immediately whether |
| the client is still alive or not. STOMP connections therefore default to |
| a connection-ttl value of 1 minute (see chapter on |
| <a href="#connection-ttl">connection-ttl</a> for more information. This value can |
| be overridden using connection-ttl-override.</p> |
| <p>If you need a specific connectionTtl for your stomp connections without |
| affecting the connectionTtlOverride setting, you can configure your |
| stomp acceptor with the "connectionTtl" property, which is used to set |
| the ttl for connections that are created from that acceptor. For |
| example:</p> |
| <pre><code><acceptor name="stomp-acceptor">tcp://localhost:61613?protocols=STOMP;connectionTtl=20000</acceptor> |
| </code></pre><p>The above configuration will make sure that any stomp connection that is |
| created from that acceptor will have its connection-ttl set to 20 |
| seconds.</p> |
| <blockquote> |
| <p><strong>Note</strong></p> |
| <p>Please note that the STOMP protocol version 1.0 does not contain any |
| heartbeat frame. It is therefore the user's responsibility to make |
| sure data is sent within connection-ttl or the server will assume the |
| client is dead and clean up server side resources. With <code>Stomp 1.1</code> |
| users can use heart-beats to maintain the life cycle of stomp |
| connections.</p> |
| </blockquote> |
| <h3 id="stomp-and-jms-interoperability">Stomp and JMS interoperability</h3> |
| <h4 id="using-jms-destinations">Using JMS destinations</h4> |
| <p>As explained in <a href="jms-core-mapping.html">Mapping JMS Concepts to the Core API</a>, |
| JMS destinations are also mapped to Apache ActiveMQ Artemis |
| addresses and queues. If you want to use Stomp to send messages to JMS |
| destinations, the Stomp destinations must follow the same convention:</p> |
| <ul> |
| <li><p>send or subscribe to a JMS <em>Queue</em> by prepending the queue name by |
| <code>jms.queue.</code>.</p> |
| <p>For example, to send a message to the <code>orders</code> JMS Queue, the Stomp |
| client must send the frame:</p> |
| <pre><code>SEND |
| destination:jms.queue.orders |
| |
| hello queue orders |
| ^@ |
| </code></pre></li> |
| <li><p>send or subscribe to a JMS <em>Topic</em> by prepending the topic name by |
| <code>jms.topic.</code>.</p> |
| <p>For example to subscribe to the <code>stocks</code> JMS Topic, the Stomp client |
| must send the frame:</p> |
| <pre><code>SUBSCRIBE |
| destination:jms.topic.stocks |
| |
| ^@ |
| </code></pre></li> |
| </ul> |
| <h4 id="sending-and-consuming-stomp-message-from-jms-or-apache-activemq-artemis-core-api">Sending and consuming Stomp message from JMS or Apache ActiveMQ Artemis Core API</h4> |
| <p>Stomp is mainly a text-orientated protocol. To make it simpler to |
| interoperate with JMS and Apache ActiveMQ Artemis Core API, our Stomp implementation |
| checks for presence of the <code>content-length</code> header to decide how to map |
| a Stomp message to a JMS Message or a Core message.</p> |
| <p>If the Stomp message does <em>not</em> have a <code>content-length</code> header, it will |
| be mapped to a JMS <em>TextMessage</em> or a Core message with a <em>single |
| nullable SimpleString in the body buffer</em>.</p> |
| <p>Alternatively, if the Stomp message <em>has</em> a <code>content-length</code> header, it |
| will be mapped to a JMS <em>BytesMessage</em> or a Core message with a <em>byte[] |
| in the body buffer</em>.</p> |
| <p>The same logic applies when mapping a JMS message or a Core message to |
| Stomp. A Stomp client can check the presence of the <code>content-length</code> |
| header to determine the type of the message body (String or bytes).</p> |
| <h4 id="message-ids-for-stomp-messages">Message IDs for Stomp messages</h4> |
| <p>When receiving Stomp messages via a JMS consumer or a QueueBrowser, the |
| messages have no properties like JMSMessageID by default. However this |
| may bring some inconvenience to clients who wants an ID for their |
| purpose. Apache ActiveMQ Artemis Stomp provides a parameter to enable message ID on |
| each incoming Stomp message. If you want each Stomp message to have a |
| unique ID, just set the <code>stompEnableMessageId</code> to true. For example:</p> |
| <pre><code><acceptor name="stomp-acceptor">tcp://localhost:61613?protocols=STOMP;stompEnableMessageId=true</acceptor> |
| </code></pre><p>When the server starts with the above setting, each stomp message sent |
| through this acceptor will have an extra property added. The property |
| key is <code>amq-message-id</code> and the value is a String representation of a |
| long type internal message id prefixed with "<code>STOMP</code>", like:</p> |
| <pre><code>amq-message-id : STOMP12345 |
| </code></pre><p>If <code>stomp-enable-message-id</code> is not specified in the configuration, |
| default is <code>false</code>.</p> |
| <h4 id="handling-of-large-messages-with-stomp">Handling of Large Messages with Stomp</h4> |
| <p>Stomp clients may send very large bodys of frames which can exceed the |
| size of Apache ActiveMQ Artemis server's internal buffer, causing unexpected errors. To |
| prevent this situation from happening, Apache ActiveMQ Artemis provides a stomp |
| configuration attribute <code>stompMinLargeMessageSize</code>. This attribute |
| can be configured inside a stomp acceptor, as a parameter. For example:</p> |
| <pre><code> <acceptor name="stomp-acceptor">tcp://localhost:61613?protocols=STOMP;stompMinLargeMessageSize=10240</acceptor> |
| </code></pre><p>The type of this attribute is integer. When this attributed is |
| configured, Apache ActiveMQ Artemis server will check the size of the body of each |
| Stomp frame arrived from connections established with this acceptor. If |
| the size of the body is equal or greater than the value of |
| <code>stompMinLargeMessageSize</code>, the message will be persisted as a large |
| message. When a large message is delievered to a stomp consumer, the |
| HorentQ server will automatically handle the conversion from a large |
| message to a normal message, before sending it to the client.</p> |
| <p>If a large message is compressed, the server will uncompressed it before |
| sending it to stomp clients. The default value of |
| <code>stompMinLargeMessageSize</code> is the same as the default value of |
| <a href="#large-messages.core.config">min-large-message-size</a>.</p> |
| <h3 id="stomp-over-web-sockets">Stomp Over Web Sockets</h3> |
| <p>Apache ActiveMQ Artemis also support Stomp over <a href="http://dev.w3.org/html5/websockets/" target="_blank">Web |
| Sockets</a>. Modern web browser which |
| support Web Sockets can send and receive Stomp messages from Apache ActiveMQ Artemis.</p> |
| <p>To enable Stomp over Web Sockets, you must configure a <code>NettyAcceptor</code> |
| with a <code>protocol</code> parameter set to <code>stomp_ws</code>:</p> |
| <pre><code><acceptor name="stomp-ws-acceptor">tcp://localhost:61614?protocols=STOMP_WS</acceptor> |
| </code></pre><p>With this configuration, Apache ActiveMQ Artemis will accept Stomp connections over Web |
| Sockets on the port <code>61614</code> with the URL path <code>/stomp</code>. Web browser can |
| then connect to <code>ws://<server>:61614/stomp</code> using a Web Socket to send |
| and receive Stomp messages.</p> |
| <p>A companion JavaScript library to ease client-side development is |
| available from <a href="http://github.com/jmesnil/stomp-websocket" target="_blank">GitHub</a> |
| (please see its <a href="http://jmesnil.net/stomp-websocket/doc/" target="_blank">documentation</a> |
| for a complete description).</p> |
| <p>The <code>stomp-websockets</code> example shows how to configure Apache ActiveMQ Artemis server to |
| have web browsers and Java applications exchanges messages on a JMS |
| topic.</p> |
| <h3 id="stompconnect">StompConnect</h3> |
| <p><a href="http://stomp.codehaus.org/StompConnect" target="_blank">StompConnect</a> is a server that |
| can act as a Stomp broker and proxy the Stomp protocol to the standard |
| JMS API. Consequently, using StompConnect it is possible to turn |
| Apache ActiveMQ Artemis into a Stomp Broker and use any of the available stomp clients. |
| These include clients written in C, C++, c# and .net etc.</p> |
| <p>To run StompConnect first start the Apache ActiveMQ Artemis server and make sure that |
| it is using JNDI.</p> |
| <p>Stomp requires the file <code>jndi.properties</code> to be available on the |
| classpath. This should look something like:</p> |
| <pre><code>java.naming.factory.initial=org.apache.activemq.artemis.jndi.ActiveMQInitialContextFactory |
| </code></pre><p>Configure any required JNDI resources in this file according to the |
| documentation.</p> |
| <p>Make sure this file is in the classpath along with the StompConnect jar |
| and the Apache ActiveMQ Artemis jars and simply run <code>java org.codehaus.stomp.jms.Main</code>.</p> |
| <h2 id="rest">REST</h2> |
| <p>Please see <a href="rest.html">Rest Interface</a></p> |
| |
| |
| </section> |
| |
| |
| </div> |
| </div> |
| </div> |
| |
| |
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