THIS IS A TEST INSTANCE. ALL YOUR CHANGES WILL BE LOST!!!!
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Available as of Camel 2.3
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This component is deprecated. You should use Netty4.
The netty component in Camel is a socket communication component, based on the Netty project.
Netty is a NIO client server framework which enables quick and easy development of network applications such as protocol servers and clients.
Netty greatly simplifies and streamlines network programming such as TCP and UDP socket server.
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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
The URI scheme for a netty component is as follows
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This component supports producer and consumer endpoints for both TCP and UDP.
You can append query options to the URI in the following format, ?option=value&option=value&...
Options
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| class | confluenceTableSmall |
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Name | Default Value | Description |
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| Setting to ensure socket is not closed due to inactivity |
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| Setting to improve TCP protocol performance |
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| Camel 2.9.6/2.10.4/2.11: Allows to configure a backlog for netty consumer (server). Note the backlog is just a best effort depending on the OS. Setting this option to a value such as |
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| Setting to choose Multicast over UDP |
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| Time to wait for a socket connection to be available. Value is in millis. |
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| Setting to facilitate socket multiplexing |
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| Setting to set endpoint as one-way or request-response |
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| Camel 2.10: Whether Asynchronous Routing Engine is not in use. |
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| Setting to specify whether SSL encryption is applied to this endpoint |
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| Camel 2.12: When enabled and in SSL mode, then the Netty consumer will enrich the Camel Message with headers having information about the client certificate such as subject name, issuer name, serial number, and the valid date range. |
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| The TCP/UDP buffer sizes to be used during outbound communication. Size is bytes. |
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| The TCP/UDP buffer sizes to be used during inbound communication. Size is bytes. |
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| Camel 2.11/2.10.4: Allows to configure additional netty options using "option." as prefix. For example "option.child.keepAlive=false" to set the netty option "child.keepAlive=false". See the Netty documentation for possible options that can be used. |
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| The number of allocated threads at component startup. Defaults to 10. Note: This option is removed from Camel 2.9.2 onwards. As we rely on Nettys default settings. |
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| The maximum number of threads that may be allocated to this endpoint. Defaults to 100. Note: This option is removed from Camel 2.9.2 onwards. As we rely on Nettys default settings. |
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| Whether or not to disconnect(close) from Netty Channel right after use. Can be used for both consumer and producer. |
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| Channels can be lazily created to avoid exceptions, if the remote server is not up and running when the Camel producer is started. |
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| Only used for TCP. You can transfer the exchange over the wire instead of just the body. The following fields are transferred: In body, Out body, fault body, In headers, Out headers, fault headers, exchange properties, exchange exception. This requires that the objects are serializable. Camel will exclude any non-serializable objects and log it at WARN level. |
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| If sync is enabled then this option dictates NettyConsumer if it should disconnect where there is no reply to send back. |
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| If sync is enabled this option dictates NettyConsumer which logging level to use when logging a there is no reply to send back. Values are: |
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| Camel 2.11.1: If the server (NettyConsumer) catches an exception then its logged using this logging level. |
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| Camel 2.11.1: If the server (NettyConsumer) catches an |
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| Camel 2.4: The netty component installs a default codec if both, encoder/deocder is null and textline is false. Setting allowDefaultCodec to false prevents the netty component from installing a default codec as the first element in the filter chain. |
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| Camel 2.4: Only used for TCP. If no codec is specified, you can use this flag to indicate a text line based codec; if not specified or the value is false, then Object Serialization is assumed over TCP. |
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| Camel 2.4: The delimiter to use for the textline codec. Possible values are |
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| Camel 2.4: The max line length to use for the textline codec. |
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| Camel 2.4: Whether or not to auto append missing end delimiter when sending using the textline codec. |
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| Camel 2.4: The encoding (a charset name) to use for the textline codec. If not provided, Camel will use the JVM default Charset. |
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| Camel 2.9: When netty works on nio mode, it uses default workerCount parameter from Netty, which is cpu_core_threads*2. User can use this operation to override the default workerCount from Netty |
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| Camel 2.9: SSL configuration using an |
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| Camel 2.9: Configures the buffer size predictor. See details at Jetty documentation and this mail thread. |
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| Camel 2.11.1: Allows to use a timeout for the Netty producer when calling a remote server. By default no timeout is in use. The value is in milli seconds, so eg |
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| Camel 2.11: Configures whether the server needs client authentication when using SSL. |
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| Camel 2.10.2: Whether to use ordered thread pool, to ensure events are processed orderly on the same channel. See details at the netty javadoc of |
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| Camel 2.10.2: The core pool size for the ordered thread pool, if its in use. Since Camel 2.14.1: This option is move the NettyComponent. |
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| Camel 2.10.4/Camel 2.11: Producer only. Whether producer pool is enabled or not. Important: Do not turn this off, as the pooling is needed for handling concurrency and reliable request/reply. |
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| Camel 2.10.3: Producer only. Sets the cap on the number of objects that can be allocated by the pool (checked out to clients, or idle awaiting checkout) at a given time. Use a negative value for no limit. |
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| Camel 2.10.3: Producer only. Sets the minimum number of instances allowed in the producer pool before the evictor thread (if active) spawns new objects. |
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| Camel 2.10.3: Producer only. Sets the cap on the number of "idle" instances in the pool. |
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| Camel 2.10.3: Producer only. Sets the minimum amount of time (value in millis) an object may sit idle in the pool before it is eligible for eviction by the idle object evictor. | |
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| Camel 2.12: Consumer only. Allows to configure the Netty ServerBootstrap options using a |
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| Camel 2.12: To use a explicit |
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| Camel 2.12: To use a explicit |
| channelGroup | null | Camel 2.17 To use a explicit io.netty.channel.group.ChannelGroup for example to broadact a message to multiple channels. |
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| Camel 2.12: Consumer only. When using UDP then this option can be used to specify a network interface by its name, such as |
| false | Camel 2.15: Producer only. This option supports connection less udp sending which is a real fire and forget. A connected udp send receive the PortUnreachableException if no one is listen on the receiving port. |
| false | Camel 2.15: Consumer only. If the clientMode is true, netty consumer will connect the address as a TCP client. |
Registry based Options
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useChannelBuffer | false | Camel 2.16: Producer only. If the useChannelBuffer is true, netty producer will turn the message body into channelBuffer before sending it out. |
Registry based Options
Codec Handlers and SSL Keystores can Codec Handlers and SSL Keystores can be enlisted in the Registry, such as in the Spring XML file.
The values that could be passed in, are the following:
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Name | Description |
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| password setting to use in order to encrypt/decrypt payloads sent using SSH |
| keystore format to be used for payload encryption. Defaults to "JKS" if not set |
| Security provider to be used for payload encryption. Defaults to "SunX509" if not set. |
| deprecated: Client side certificate keystore to be used for encryption |
| deprecated: Server side certificate keystore to be used for encryption |
| Camel 2.11.1: Client side certificate keystore to be used for encryption. Is loaded by default from classpath, but you can prefix with |
| Camel 2.11.1: Server side certificate keystore to be used for encryption. Is loaded by default from classpath, but you can prefix with |
| Reference to a class that could be used to return an SSL Handler |
| A custom |
| A list of encoders to be used. You can use a String which have values separated by comma, and have the values be looked up in the Registry. Just remember to prefix the value with # so Camel knows it should lookup. |
| A custom |
| A list of decoders to be used. You can use a String which have values separated by comma, and have the values be looked up in the Registry. Just remember to prefix the value with # so Camel knows it should lookup. |
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Header key | Class | Description |
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| org.jboss.netty.channel.ChannelHandlerContext |
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| org.jboss.netty.channel.MessageEvent |
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| java.net.SocketAddress | Remote address of the incoming socket connection. |
NettyConstants.NETTY_LOCAL_ADDRESS / CamelNettyLocalAddress | java.net.SocketAddress | Local address of the incoming socket connection. |
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A UDP Netty endpoint using Request-Reply and serialized object payload
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A TCP based Netty consumer endpoint using One-way communication
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An SSL/TCP based Netty consumer endpoint using Request-Reply communication
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Spring DSL based configuration of endpoint
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Using Basic SSL/TLS configuration on the Jetty Component
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Getting access to SSLSession and the client certificate
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You can get access to the javax.net.ssl.SSLSession if you eg need to get details about the client certificate. When ssl=true then the Netty component will store the SSLSession as a header on the Camel Message as shown below:
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Remember to set needClientAuth=true to authenticate the client, otherwise SSLSession cannot access information about the client certificate, and you may get an exception javax.net.ssl.SSLPeerUnverifiedException: peer not authenticated. You may also get this exception if the client certificate is expired or not valid etc.
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The option sslClientCertHeaders can be set to true which then enriches the Camel Message with headers having details about the client certificate. For example the subject name is readily available in the header CamelNettySSLClientCertSubjectName.
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Read further above about using non shareable encoders/decoders.
The lists of codecs need to be added to the Camel's registry so they can be resolved when the endpoint is created.
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Spring's native collections support can be used to specify the codec lists in an application context
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The bean names can then be used in netty endpoint definitions either as a comma separated list or contained in a List e.g.
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or via spring.
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Closing Channel When Complete
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However you can also instruct Camel on a per message basis as follows.
To instruct Camel to close the channel, you should add a header with the key CamelNettyCloseChannelWhenComplete set to a boolean true value.
For instance, the example below will close the channel after it has written the bye message back to the client:
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Adding custom channel pipeline factories to gain complete control over a created pipeline
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The example below shows how ServerChannel Pipeline factory may be created
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The custom channel pipeline factory can then be added to the registry and instantiated/utilized on a camel route in the following way
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Reusing Netty boss and worker thread pools
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For example using Spring XML we can create a shared worker thread pool using the NettyWorkerPoolBuilder with 2 worker threads as shown below:
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For boss thread pool there is a org.apache.camel.component.netty.NettyServerBossPoolBuilder builder for Netty consumers, and a org.apache.camel.component.netty.NettyClientBossPoolBuilder for the Netty produces.
Then in the Camel routes we can refer to this worker pools by configuring the workerPool option in the URI as shown below:
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And if we have another route we can refer to the shared worker pool:
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... and so forth.Include Page