Cometd Component

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The cometd: component is a transport for working with the jetty implementation of the cometd/bayeux protocol.
-Using this component in combination with the dojo toolkit library it's possible to push Camel messages directly into the browser using an AJAX based mechanism.

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Maven users will need to add the following dependency to their pom.xml for this component:

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URI format

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The channelName represents a topic that can be subscribed to by the Camel endpoints.

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Examples

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The channelName represents a topic that can be subscribed to by the Camel endpoints.

Examples

cometd://localhost:8080/service/mychannel
 cometds://localhost:8443/service/mychannel

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where cometds: represents an SSL configured endpoint.

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See this blog entry by David Greco who contributed this component to Apache Camel, for a full sample.

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Options

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Name	Default Value	Description
`resourceBase`		The root directory for the web resources or classpath. Use the protocol file: or classpath: depending if you want that the component loads the resource from file system or classpath. Classpath is required for OSGI deployment where the resources are packaged in the jar. Notice this option has been renamed to `baseResource` from Camel 2.7 onwards.
`baseResource`		Camel 2.7: The root directory for the web resources or classpath. Use the protocol file: or classpath: depending if you want that the component loads the resource from file system or classpath. Classpath is required for OSGI deployment where the resources are packaged in the jar
`timeout`	`240000`	The server side poll timeout in milliseconds. This is how long the server will hold a reconnect request before responding.
`interval`	`0`	The client side poll timeout in milliseconds. How long a client will wait between reconnects
`maxInterval`	`30000`	The max client side poll timeout in milliseconds. A client will be removed if a connection is not received in this time.
`multiFrameInterval`	`1500`	The client side poll timeout, if multiple connections are detected from the same browser.
`jsonCommented`	`true`	If `true`, the server will accept JSON wrapped in a comment and will generate JSON wrapped in a comment. This is a defence against Ajax Hijacking.
`logLevel`	`1`	`0`=none, `1`=info, `2`=debug.
sslContextParameters		Camel 2.9: Reference to a `org.apache.camel.util.jsse.SSLContextParameters` in the Registry. This reference overrides any configured SSLContextParameters at the component lev el. See Using the JSSE Configuration Utility.
`crossOriginFilterOn`	`false`	Camel 2.10: If `true`, the server will support for cross-domain filtering
`allowedOrigins`	`*`	Camel 2.10: The origins domain that support to cross, if the `crosssOriginFilterOn` is `true`
`filterPath`		Camel 2.10: The filterPath will be used by the CrossOriginFilter, if the `crosssOriginFilterOn` is `true`
`disconnectLocalSession`	`true`	Camel 2.10.5/2.11.1: (Producer only): Whether to disconnect local sessions after publishing a message to its channel. Disconnecting local session is needed as they are not swept by default by CometD, and therefore you can run out of memory.

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You can append query options to the URI in the following format, ?option=value&option=value&...

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Here is some examples on How to pass the parameters

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For file (for webapp resources located in the Web Application directory --> cometd://localhost:8080?resourceBase=file./webapp
-For classpath (when by example the web resources are packaged inside the webapp folder --> cometd://localhost:8080?resourceBase=classpath:webapp

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Authentication

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Available as of Camel 2.8

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You can configure custom SecurityPolicy and Extension's to the CometdComponent which allows you to use authentication as documented here

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Setting up SSL for Cometd Component

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Using the JSSE Configuration Utility

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As of Camel 2.9, the Cometd component supports SSL/TLS configuration through the Camel JSSE Configuration Utility. This utility greatly decreases the amount of component specific code you need to write and is configurable at the endpoint and component levels. The following examples demonstrate how to use the utility with the Cometd component.

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Programmatic configuration of the component

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Spring DSL based configuration of endpoint

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Cometd Component

URI format

Examples

Examples

Options

Authentication

Setting up SSL for Cometd Component

Using the JSSE Configuration Utility

Programmatic configuration of the component

Spring DSL based configuration of endpoint

See Also

See Also

Context Component

Preface

Cometd Component

URI format

Examples

Examples

Options

Authentication

Setting up SSL for Cometd Component

Using the JSSE Configuration Utility

Programmatic configuration of the component

Spring DSL based configuration of endpoint

See Also

`See Also`

Context Component

Cometd Component

URI format

Examples

Examples

Options

Authentication

Setting up SSL for Cometd Component

Using the JSSE Configuration Utility

Programmatic configuration of the component

Spring DSL based configuration of endpoint

See Also

See Also