# Aggregator Function This module provides an aggregation function that can be reused and composed in other applications. ## Beans for injection You can import the `AggregatorFunctionConfiguration` in a Spring Boot application and then inject the following bean. `aggregatorFunction` You can use `aggregatorFunction` as a qualifier when injecting. Once injected, you can use the `apply` method of the `Function` to invoke it and get the result. ## Configuration Options For more information on the various options available, please see link:src/main/java/org/springframework/cloud/fn/aggregator/AggregatorFunctionProperties.java[AggregatorFunctionProperties.java] A `ComponentCustomizer<AggregatorFactoryBean>` bean can be added in the target project to provide any custom options for the `AggregatorFactoryBean` configuration used by the `aggregatorFunction` definition. ## Tests See this link:src/test/java/org/springframework/cloud/fn/aggregator/AggregatorFunctionApplicationTests.java[test suite] for examples of how this function is used. ## Other usage See this link:../../../applications/processor/aggregator-processor/README.adoc[README] where this function is used to create a Spring Cloud Stream application.