Message aggregation and JMS messaging patterns
Implement the Aggregator pattern with the Mule Aggregators module (size, time and group scopes, completion and timeout routes, listeners, eviction and content), and the JMS durable-subscription, request-reply and no-local patterns with JMS Connector.
Design Mule applications and integration solutions using common messaging patterns and technologies.
~8 min read · 10 practice questions
What the exam expects
- Map an Enterprise Integration Pattern to the Mule component that implements it.
- Choose a size-based, time-based or group-based aggregator and set its Group Id, Group Size, Content, Timeout and Eviction Time from the requirement.
- Route released elements correctly: the aggregation-complete route, the Aggregator Listener for timeouts, and the unchanged pass-through payload.
- Reactivate a durable JMS subscription, route request-reply responses, and exclude a connection's own publications.
Aggregator scope: a component that extracts a value from each message and adds it to a list of aggregated elements. Pass-through router: a router whose following components receive the same data it received. Aggregator Listener: a source in another flow triggered when a named aggregator releases its elements. Eviction Time: how long a group ID is remembered after it completes or times out. Durable subscription: a topic subscription whose messages the JMS provider stores while the consumer is offline (Aggregators reference, JMS topic subscriptions).
Key facts
- Detail
- Components after the scope receive the original data.
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- Starts at the first element's arrival.
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- Aggregation Complete route does not run on timeout.
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- Default 180 seconds; 0 don't remember; -1 forever.
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- Not supported.
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- Stored in an object store, so it must be serializable.
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- One aggregator per listener, one listener per aggregator; timed-out groups default false.
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- Guard the listener path with
isAggregationComplete.
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- Same connection, client ID, topic and subscription name.
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- CORRELATION_ID default; MESSAGE_ID; NONE.
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- Maximum wait exceeded fails with JMS:TIMEOUT.
- Which error does a group-based aggregator raise when its Group Id expression returns null?
- When does the autogenerated Aggregation ID of a size-based or time-based aggregation change?
- Why does a time-driven aggregation usually need an Aggregator Listener?
- What happens when a Publish consume operation receives no reply within its Maximum wait?
The questions are free to read. Answers with their sources and self-grading are included with the pack.
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