=== Clustering

Support for Quartz clustering is provided by the Quarkus Quartz extension. The following steps outline how to configure Quarkus Quartz for use with Camel.

1. Enable Quartz clustered mode and configure a `DataSource` as a persistence Quartz job store. An example configuration is as follows.
+
[source,properties]
----
# Quartz configuration
quarkus.quartz.clustered=true
quarkus.quartz.store-type=jdbc-cmt
quarkus.scheduler.start-mode=forced

# Datasource configuration
quarkus.datasource.db-kind=postgresql
quarkus.datasource.username=quarkus_test
quarkus.datasource.password=quarkus_test
quarkus.datasource.jdbc.url=jdbc:postgresql://localhost/quarkus_test

# Optional automatic creation of Quartz tables
quarkus.flyway.connect-retries=10
quarkus.flyway.table=flyway_quarkus_history
quarkus.flyway.migrate-at-start=true
quarkus.flyway.baseline-on-migrate=true
quarkus.flyway.baseline-version=1.0
quarkus.flyway.baseline-description=Quartz
----

2. Add the correct JDBC driver extension to your application that corresponds to the value of `quarkus.datasource.db-kind`. In the above
example `postgresql` is used, therefore the following JDBC dependency would be required. Adjust as necessary for your needs. Agroal is also required
for `DataSource` support.
+
[source,xml]
----
<dependency>
    <groupId>io.quarkus</groupId>
    <artifactId>quarkus-jdbc-postgresql</artifactId>
</dependency>
<dependency>
    <groupId>io.quarkus</groupId>
    <artifactId>quarkus-agroal</artifactId>
</dependency>
----

3. https://quarkus.io/guides/flyway[Quarkus Flyway] can automatically create the necessary Quartz database tables for you. Add `quarkus-flyway` to your application (optional).
+
[source,xml]
----
<dependency>
    <groupId>io.quarkus</groupId>
    <artifactId>quarkus-flyway</artifactId>
</dependency>
----
+
Also add a Quartz database creation script for your chosen database kind.
The Quartz project provides ready made scripts that can be copied from https://github.com/quartz-scheduler/quartz/tree/master/quartz-core/src/main/resources/org/quartz/impl/jdbcjobstore[here]. Add the SQL
script to `src/main/resources/db/migration/V1.0.0__QuarkusQuartz.sql`. Quarkus Flyway will detect it on startup and will proceed to create the Quartz database tables.

4. Configure the Camel Quartz component to use the Quarkus Quartz scheduler.
+
[source,java]
----
@Produces
@Singleton
@Named("quartz")
public QuartzComponent quartzComponent(Scheduler scheduler) {
    QuartzComponent component = new QuartzComponent();
    component.setScheduler(scheduler);
    return component;
}
----

Further customization of the Quartz scheduler can be done via various configuration properties. Refer to to the https://quarkus.io/guides/quartz#quartz-configuration-reference[Quarkus Quartz Configuration] guide for more information.
