cAggregate Standard properties
These properties are used to configure cAggregate running in the Standard Job framework.
The Standard cAggregate component belongs to the Routing family.
Basic settings
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Language |
Select the language of the expression you want to use to filter your messages, from None, Bean, CONSTANT, ESBCorrelationID, EL, GROOVY, HEADER, JoSQL, JSonPath, JXPATH, MVEL, OGNL, PHP, PROPERTY, PYTHON, RUBY, SIMPLE, SpEL, SQL, XPATH, and XQUERY. Select CorrelationID to use the existing correlation ID of the message as the correlation key if the correlation ID is available in the closest cSOAP connected to this component. For more information about the cSOAP component, see cSOAP. |
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Correlation expression/Expression |
Type in the expression that evaluates the correlation key to be used for the aggregation. This field disappears when CorrelationID is selected in the Language list. In this case, the existing correlation ID from the closest cSOAP connected to this component will be used. For more information about the cSOAP component, see cSOAP. |
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Correlation expression/Add Namespaces |
This option appears when XPath is selected in the Language list. Select this check box to add namespaces for the Xpath expression. Click [+] to add as many namespaces as required to the table and define the prefix and URI in the corresponding columns. |
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Strategy |
Specify a Java bean to use as the aggregation strategy or select a
predefined aggregation strategy.
Information noteNote: The predefined aggregation strategies are available only if you have
installed the R2024-10 Talend Studio Monthly update or a later one delivered by Talend. For more information, check with your administrator.
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Completion conditions/Number of messages |
Select this check box to specify the number of messages to aggregate per batch before the aggregation is complete. Information noteNote:
By default, this check box is selected and the number of messages is set to 3. If you clear this check box, and at least one of the other four completion conditions is met, all the messages retrieved will be aggregated in one batch. |
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Completion conditions/Inactivity timeout (in milliseconds) |
Select this check box to specify the time (in milliseconds) that an aggregated exchange should be inactive before it is complete. This option can be set as either a fixed value or using an Expression which allows you to evaluate a timeout dynamically. Information noteNote:
You can not use this option together with Scheduled interval. Only one of them can be used at a time. |
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Completion conditions/Scheduled interval (in milliseconds) |
Select this check box to specify a repeating period (in milliseconds) by which the aggregator will complete all current aggregated exchanges. Information noteNote:
You cannot use this option together with Inactivity timeout. Only one of them can be used at a time. |
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Completion conditions/Predicate matched |
Select this check box to specify a predicate to indicate when an aggregated exchange is complete. |
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Completion conditions/Batch consumer |
Select this check box to aggregate all files consumed from a file endpoint in a given poll. |
Advanced settings
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Check completion before aggregating |
Select this check box to check for completion when a new incoming exchange has been received. This option influences the behavior of the Predicate matched option as the exchange being passed in changes accordingly. When this option is disabled, the exchange passed in the predicate is the aggregated exchange which means any information you may store on the aggregated exchange from the aggregation strategy is available for the predicate. When this option is enabled, the exchange passed in the predicate is the incoming exchange, which means you can access data from the incoming exchange. |
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Close correlation group |
Select this check box to indicate that if a correlation key has already been completed, then any new exchanges with the same correlation key will be denied. When using this option, enter a number in the Maximum bound field to keep that last number of closed correlation keys. |
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Ignore invalid correlation key |
Select this check box to ignore the invalid correlation key which could not be evaluated to a value. By default Camel will throw an Exception on encountering an invalid correlation key. |
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Group arriving exchange |
Select this check box to group all aggregated exchanges into a single combined holder class that holds all the aggregated exchanges. As a result only one exchange is being sent out from the aggregator. This option can be used to combine many incoming exchanges into a single output exchange. |
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Use persistence |
Select this check box to plug in your own implementation of the repository which keeps track of the current in-flight aggregated exchanges. By default, Camel uses a memory based implementation. |
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Repository |
This field appears when the Use persistence check box is selected. The repository is AggregationRepository or RecoverableAggregationRepository. AggregationRepository: The default repository used by Camel which is a memory based implementation. Enter the name of the repository in the field. RecoverableAggregationRepository: RecoverableAggregationRepository is a JDBC based AggregationRepository which persists the aggregated messages on the fly. This ensures that you will not loose messages. Enter the name of the repository in the field. With this repository selected, the following options appear: Recovery/Use recovery: Select this check box to recover failed aggregated exchanges and have them resubmitted automatically. In the Recovery interval field, enter the interval (in milliseconds) to scan for failed exchanges to recover and resubmit. By default this interval is 5000 milliseconds. In the Dead letter channel field, enter an endpoint URI for a Dead Letter Channel where exhausted recovered exchanges will be moved. In the Maximum redeliveries field, enter the maximum number of redelivery attempts for a given recovered exchange. |
Usage
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Usage rule |
cAggregate is used as a middle or end component in a Route. |
| Connections |
Aggregate: select this link to route messages to the next endpoint according to the selected aggregation strategy. Route: select this link to route all the messages from the sender to the next endpoint. |