README.adoc

Camel Aggregate

Introduction

This example shows how to use Camel Aggregator EIP which offers (since Camel 2.3) database persistence.

It’s an interactive example where you can type in some numbers which then are aggregated (summed, per this sample’s aggregation strategy) whenever the user types STOP. The user can then enter more numbers to do another aggregation.

How it works

The example is an interactive example where it prompts on the console for you to enter a number and press ENTER. The numbers you enter will then be aggregated and persisted. That means you can at any time hit ctrl + c to shut down Camel.

Then you should be able to start the example again and resume where you left. When you want to complete the aggregation you can enter STOP as input and Camel will show you the result, which is the sum of all the numbers entered.

The persistent datastore is located in the data/hawtdb.dat file. Its automatically created the first time.

Camel component used in this example

• camel-core

• camel-spring

• camel-stream

Build

The example is run using Maven.

First compile the example by entering:

$ mvn compile

Run

To run the example type:

$ mvn camel:run

To stop the example hit ctrl + c. If you restart it and resume entering numbers you should see that it remembered previously entered values, as it uses a persistent store.

Help and contributions

If you hit any problem using Camel or have some feedback, then please let us know.

We also love contributors, so get involved :-)

The Camel riders!