UuidGenerator

Starting with Camel 2.5, Camel supports 3rd party UUID generator(s). This is useful, if e.g. your messaging provider does not support UUID’s with a length of 36 characters (like Websphere MQ). Another useful scenario is to use a simple counter for testing purpose. With this it is easier to correlate the exchanges in the log/debugger.

Camel uses UUIDs in the exchange and message ids, and other unique ids it uses.

You only have to implement org.apache.camel.spi.UuidGenerator and tell Camel, that it should use your custom implementation:

Configuring from Java DSL

getContext().setUuidGenerator(new MyCustomUuidGenerator());

Warning: You should not change the UUID generator at runtime (it should only be set once)!

Configuring from XML DSL

Camel will configure this UUID generator by doing a lookup in the Spring bean registry to find the bean of the type org.apache.camel.spi.UuidGenerator.

<bean id="simpleUuid" class="org.apache.camel.support.SimpleUuidGenerator" />

<camelContext id="camel" xmlns="http://camel.apache.org/schema/spring">
  <route>
    <from uri="direct:start" />
    <to uri="mock:result" />
  </route>
</camelContext>

Provided implementations

Camel comes with three implementations of org.apache.camel.spi.UuidGenerator:

  • org.apache.camel.support.SimpleUuidGenerator - This implementation uses internally a java.util.concurrent.atomic.AtomicLong and increases the ID for every call by one. Starting with 1 as the first id.

  • org.apache.camel.support.VanillaUuidGenerator - This implementation uses a random generated seed and a counter which increments by one. This generator is not unique per host or JVM.

  • org.apache.camel.impl.engine.DefaultUuidGenerator - This implementation uses a fast unique UUID generation that is cluster safe (similar to uuid generator in ActiveMQ). This is the default implementation in use by Camel.

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