CometD

Offers publish/subscribe, peer-to-peer (via a server), and RPC style messaging using the CometD/Bayeux protocol.

What’s inside

CometD component, URI syntax: cometd:host:port/channelName
CometD (Secure) component, URI syntax: cometds:host:port/channelName

Please refer to the above links for usage and configuration details.

Maven coordinates

<dependency>
    <groupId>org.apache.camel.springboot</groupId>
    <artifactId>camel-cometd-starter</artifactId>
</dependency>

Spring Boot Auto-Configuration

The starter supports 11 options, which are listed below.

Name	Description	Default	Type
camel.component.cometd.autowired-enabled	Whether autowiring is enabled. This is used for automatic autowiring options (the option must be marked as autowired) by looking up in the registry to find if there is a single instance of matching type, which then gets configured on the component. This can be used for automatic configuring JDBC data sources, JMS connection factories, AWS Clients, etc.	true	Boolean
camel.component.cometd.bridge-error-handler	Allows for bridging the consumer to the Camel routing Error Handler, which mean any exceptions (if possible) occurred while the Camel consumer is trying to pickup incoming messages, or the likes, will now be processed as a message and handled by the routing Error Handler. Important: This is only possible if the 3rd party component allows Camel to be alerted if an exception was thrown. Some components handle this internally only, and therefore bridgeErrorHandler is not possible. In other situations we may improve the Camel component to hook into the 3rd party component and make this possible for future releases. By default the consumer will use the org.apache.camel.spi.ExceptionHandler to deal with exceptions, that will be logged at WARN or ERROR level and ignored.	false	Boolean
camel.component.cometd.enabled	Whether to enable auto configuration of the cometd component. This is enabled by default.		Boolean
camel.component.cometd.extensions	To use a list of custom BayeuxServer.Extension that allows modifying incoming and outgoing requests.		BayeuxServer$Extension>
camel.component.cometd.lazy-start-producer	Whether the producer should be started lazy (on the first message). By starting lazy you can use this to allow CamelContext and routes to startup in situations where a producer may otherwise fail during starting and cause the route to fail being started. By deferring this startup to be lazy then the startup failure can be handled during routing messages via Camel’s routing error handlers. Beware that when the first message is processed then creating and starting the producer may take a little time and prolong the total processing time of the processing.	false	Boolean
camel.component.cometd.security-policy	To use a custom configured SecurityPolicy to control authorization. The option is a org.cometd.bayeux.server.SecurityPolicy type.		SecurityPolicy
camel.component.cometd.ssl-context-parameters	To configure security using SSLContextParameters. The option is a org.apache.camel.support.jsse.SSLContextParameters type.		SSLContextParameters
camel.component.cometd.ssl-key-password	The password for the keystore when using SSL.		String
camel.component.cometd.ssl-keystore	The path to the keystore.		String
camel.component.cometd.ssl-password	The password when using SSL.		String
camel.component.cometd.use-global-ssl-context-parameters	Enable usage of global SSL context parameters.	false	Boolean

Name

Description

Default

Type

camel.component.cometd.autowired-enabled

Whether autowiring is enabled. This is used for automatic autowiring options (the option must be marked as autowired) by looking up in the registry to find if there is a single instance of matching type, which then gets configured on the component. This can be used for automatic configuring JDBC data sources, JMS connection factories, AWS Clients, etc.

true

Boolean

camel.component.cometd.bridge-error-handler

Allows for bridging the consumer to the Camel routing Error Handler, which mean any exceptions (if possible) occurred while the Camel consumer is trying to pickup incoming messages, or the likes, will now be processed as a message and handled by the routing Error Handler. Important: This is only possible if the 3rd party component allows Camel to be alerted if an exception was thrown. Some components handle this internally only, and therefore bridgeErrorHandler is not possible. In other situations we may improve the Camel component to hook into the 3rd party component and make this possible for future releases. By default the consumer will use the org.apache.camel.spi.ExceptionHandler to deal with exceptions, that will be logged at WARN or ERROR level and ignored.

false

Boolean

camel.component.cometd.enabled

Whether to enable auto configuration of the cometd component. This is enabled by default.

Boolean

camel.component.cometd.extensions

To use a list of custom BayeuxServer.Extension that allows modifying incoming and outgoing requests.

BayeuxServer$Extension>

camel.component.cometd.lazy-start-producer

Whether the producer should be started lazy (on the first message). By starting lazy you can use this to allow CamelContext and routes to startup in situations where a producer may otherwise fail during starting and cause the route to fail being started. By deferring this startup to be lazy then the startup failure can be handled during routing messages via Camel’s routing error handlers. Beware that when the first message is processed then creating and starting the producer may take a little time and prolong the total processing time of the processing.

false

Boolean

camel.component.cometd.security-policy

To use a custom configured SecurityPolicy to control authorization. The option is a org.cometd.bayeux.server.SecurityPolicy type.

SecurityPolicy

camel.component.cometd.ssl-context-parameters

To configure security using SSLContextParameters. The option is a org.apache.camel.support.jsse.SSLContextParameters type.

SSLContextParameters

camel.component.cometd.ssl-key-password

The password for the keystore when using SSL.

String

camel.component.cometd.ssl-keystore

The path to the keystore.

String

camel.component.cometd.ssl-password

The password when using SSL.

String

camel.component.cometd.use-global-ssl-context-parameters

Enable usage of global SSL context parameters.

false

Boolean