Eclipse Kura component
This documentation page covers the integration options of Camel with the Eclipse Kura M2M gateway.
KuraRouter activator
The easiest way to deploy Apache Camel routes into the Kura is to create an OSGi bundle containing the class extending org.apache.camel.kura.KuraRouter
class:
public class MyKuraRouter extends KuraRouter { @Override public void configure() throws Exception { from("timer:trigger"). to("netty-http:http://app.mydatacenter.com/api"); } }
Kura router starts its own OSGi-aware CamelContext
. It means that for every class extending KuraRouter
, there will be a dedicated CamelContext
instance. Ideally we recommend to deploy one KuraRouter
per OSGi bundle.
Deploying KuraRouter
Bundle containing your Kura router class should import the following bundles in the OSGi manifest:
Import-Package: org.osgi.framework;version="1.3.0", org.slf4j;version="1.6.4", org.apache.camel,org.apache.camel.impl,org.apache.camel.core.osgi,org.apache.camel.builder,org.apache.camel.model, org.apache.camel.kura
Keep in mind that you don't have to import every Camel component bundle you plan to use in your routes, as Camel components are resolved as the services on the runtime level.
Before you deploy your router bundle, be sure that you have deployed (and started) the following Camel core bundles (using Kura GoGo shell)...
install file:///home/user/.m2/repository/org/apache/camel/camel-core/2.15.0/camel-core-2.15.0.jar start <camel-core-bundle-id> install file:///home/user/.m2/repository/org/apache/camel/camel-core-osgi/2.15.0/camel-core-osgi-2.15.0.jar start <camel-core-osgi-bundle-id> install file:///home/user/.m2/repository/org/apache/camel/camel-kura/2.15.0/camel-kura-2.15.0.jar start <camel-kura-bundle-id>
...and all the components you plan to use in your routes:
install file:///home/user/.m2/repository/org/apache/camel/camel-stream/2.15/camel-stream-2.15.jar start <camel-kura-bundle-id>
Then finally deploy your router bundle:
install file:///home/user/.m2/repository/com/example/myrouter/1.0/myrouter-1.0.jar start <your-bundle-id>
KuraRouter utilities
Kura router base class provides many useful utilities. This section explores each of those.
SLF4J logger
Kura uses SLF4J facade for logging purposes. Protected member log
returns SLF4J logger instance associated with the given Kura router.
public class MyKuraRouter extends KuraRouter { @Override public void configure() throws Exception { log.info("Configuring Camel routes!"); ... } }
BundleContext
Protected member bundleContext
returns bundle context associated with the given Kura router.
public class MyKuraRouter extends KuraRouter { @Override public void configure() throws Exception { ServiceReference<MyService> serviceRef = bundleContext.getServiceReference(LogService.class.getName()); MyService myService = content.getService(serviceRef); ... } }
CamelContext
Protected member camelContext
is the CamelContext
associated with the given Kura router.
public class MyKuraRouter extends KuraRouter { @Override public void configure() throws Exception { camelContext.getStatus(); ... } }
OSGi service resolver
OSGi service resolver (service(Class<T> serviceType)
) can be used to easily retrieve service by type from the OSGi bundle context.
public class MyKuraRouter extends KuraRouter { @Override public void configure() throws Exception { MyService myService = service(MyService.class); ... } }