MINA 2 Component

Table of Contents

URI format
Options
Using a custom codec
Sample with sync=false
Sample with sync=true
Sample with Spring DSL
Closing Session When Complete
Get the IoSession for message
Configuring Mina filters
See Also

Available as of Camel 2.10

The mina2: component is a transport for working with Apache MINA 2.x

[Tip]Tip

Favor using Netty as Netty is a much more active maintained and popular project than Apache Mina currently is

INFO: Be careful with sync=false on consumer endpoints. Since camel-mina2 all consumer exchanges are InOut. This is different to camel-mina.

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

<dependency>
    <groupId>org.apache.camel</groupId>
    <artifactId>camel-mina2</artifactId>
    <version>x.x.x</version>
    <!-- use the same version as your Camel core version -->
</dependency>

URI format

mina2:tcp://hostname[:port][?options]
mina2:udp://hostname[:port][?options]
mina2:vm://hostname[:port][?options]

You can specify a codec in the Registry using the codec option. If you are using TCP and no codec is specified then the textline flag is used to determine if text line based codec or object serialization should be used instead. By default the object serialization is used.

For UDP if no codec is specified the default uses a basic ByteBuffer based codec.

The VM protocol is used as a direct forwarding mechanism in the same JVM.

A Mina producer has a default timeout value of 30 seconds, while it waits for a response from the remote server.

In normal use, camel-mina only supports marshalling the body content—message headers and exchange properties are not sent. However, the option, transferExchange, does allow you to transfer the exchange itself over the wire. See options below.

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

Options

The Mina2 component supports 1 options which are listed below.

{% raw %}

NameJava TypeDescription

configuration

Mina2Configuration

To use the shared mina configuration.

{% endraw %}

The Mina2 component supports 29 endpoint options which are listed below:

{% raw %}

NameGroupDefaultJava TypeDescription

protocol

common

 

String

Required Protocol to use

host

common

 

String

Required Hostname to use. Use localhost or 0.0.0.0 for local server as consumer. For producer use the hostname or ip address of the remote server.

port

common

 

int

Required Port number

disconnect

common

false

boolean

Whether or not to disconnect(close) from Mina session right after use. Can be used for both consumer and producer.

minaLogger

common

false

boolean

You can enable the Apache MINA logging filter. Apache MINA uses slf4j logging at INFO level to log all input and output.

sync

common

true

boolean

Setting to set endpoint as one-way or request-response.

timeout

common

30000

long

You can configure the timeout that specifies how long to wait for a response from a remote server. The timeout unit is in milliseconds so 60000 is 60 seconds.

bridgeErrorHandler

consumer

false

boolean

Allows for bridging the consumer to the Camel routing Error Handler which mean any exceptions occurred while the consumer is trying to pickup incoming messages or the likes will now be processed as a message and handled by the routing Error Handler. By default the consumer will use the org.apache.camel.spi.ExceptionHandler to deal with exceptions that will be logged at WARN/ERROR level and ignored.

clientMode

consumer

false

boolean

If the clientMode is true mina consumer will connect the address as a TCP client.

disconnectOnNoReply

consumer (advanced)

true

boolean

If sync is enabled then this option dictates MinaConsumer if it should disconnect where there is no reply to send back.

exceptionHandler

consumer (advanced)

 

ExceptionHandler

To let the consumer use a custom ExceptionHandler. Notice if the option bridgeErrorHandler is enabled then this options is not in use. By default the consumer will deal with exceptions that will be logged at WARN/ERROR level and ignored.

exchangePattern

consumer (advanced)

 

ExchangePattern

Sets the exchange pattern when the consumer creates an exchange.

noReplyLogLevel

consumer (advanced)

WARN

LoggingLevel

If sync is enabled this option dictates MinaConsumer which logging level to use when logging a there is no reply to send back.

cachedAddress

producer (advanced)

true

boolean

Whether to create the InetAddress once and reuse. Setting this to false allows to pickup DNS changes in the network.

lazySessionCreation

producer (advanced)

true

boolean

Sessions can be lazily created to avoid exceptions if the remote server is not up and running when the Camel producer is started.

maximumPoolSize

advanced

16

int

Number of worker threads in the worker pool for TCP and UDP

orderedThreadPoolExecutor

advanced

true

boolean

Whether to use ordered thread pool to ensure events are processed orderly on the same channel.

synchronous

advanced

false

boolean

Sets whether synchronous processing should be strictly used or Camel is allowed to use asynchronous processing (if supported).

transferExchange

advanced

false

boolean

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.

allowDefaultCodec

codec

true

boolean

The mina component installs a default codec if both codec is null and textline is false. Setting allowDefaultCodec to false prevents the mina component from installing a default codec as the first element in the filter chain. This is useful in scenarios where another filter must be the first in the filter chain like the SSL filter.

codec

codec

 

ProtocolCodecFactory

To use a custom minda codec implementation.

decoderMaxLineLength

codec

1024

int

To set the textline protocol decoder max line length. By default the default value of Mina itself is used which are 1024.

encoderMaxLineLength

codec

-1

int

To set the textline protocol encoder max line length. By default the default value of Mina itself is used which are Integer.MAX_VALUE.

encoding

codec

 

String

You can configure the encoding (a charset name) to use for the TCP textline codec and the UDP protocol. If not provided Camel will use the JVM default Charset

filters

codec

 

List

You can set a list of Mina IoFilters to use.

textline

codec

false

boolean

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.

textlineDelimiter

codec

 

Mina2TextLineDelimiter

Only used for TCP and if textline=true. Sets the text line delimiter to use. If none provided Camel will use DEFAULT. This delimiter is used to mark the end of text.

autoStartTls

security

true

boolean

Whether to auto start SSL handshake.

sslContextParameters

security

 

SSLContextParameters

To configure SSL security.

{% endraw %}

Using a custom codec

See the Mina how to write your own codec. To use your custom codec with camel-mina, you should register your codec in the Registry; for example, by creating a bean in the Spring XML file. Then use the codec option to specify the bean ID of your codec. See HL7 that has a custom codec.

Sample with sync=false

In this sample, Camel exposes a service that listens for TCP connections on port 6200. We use the textline codec. In our route, we create a Mina consumer endpoint that listens on port 6200:

from("mina2:tcp://localhost:" + port1 + "?textline=true&sync=false").to("mock:result");

As the sample is part of a unit test, we test it by sending some data to it on port 6200.

MockEndpoint mock = getMockEndpoint("mock:result");
mock.expectedBodiesReceived("Hello World");

template.sendBody("mina2:tcp://localhost:" + port1 + "?textline=true&sync=false", "Hello World");

assertMockEndpointsSatisfied();

Sample with sync=true

In the next sample, we have a more common use case where we expose a TCP service on port 6201 also use the textline codec. However, this time we want to return a response, so we set the sync option to true on the consumer.

from("mina2:tcp://localhost:" + port2 + "?textline=true&sync=true").process(new Processor() {
    public void process(Exchange exchange) throws Exception {
        String body = exchange.getIn().getBody(String.class);
        exchange.getOut().setBody("Bye " + body);
    }
});

Then we test the sample by sending some data and retrieving the response using the template.requestBody() method. As we know the response is a String, we cast it to String and can assert that the response is, in fact, something we have dynamically set in our processor code logic.

String response = (String)template.requestBody("mina2:tcp://localhost:" + port2 + "?textline=true&sync=true", "World");
assertEquals("Bye World", response);

Sample with Spring DSL

Spring DSL can, of course, also be used for MINA. In the sample below we expose a TCP server on port 5555:

   <route>
     <from uri="mina2:tcp://localhost:5555?textline=true"/>
     <to uri="bean:myTCPOrderHandler"/>
  </route>

In the route above, we expose a TCP server on port 5555 using the textline codec. We let the Spring bean with ID, myTCPOrderHandler, handle the request and return a reply. For instance, the handler bean could be implemented as follows:

    public String handleOrder(String payload) {
        ...
        return "Order: OK"
   }

Closing Session When Complete

When acting as a server you sometimes want to close the session when, for example, a client conversion is finished. To instruct Camel to close the session, you should add a header with the key CamelMinaCloseSessionWhenComplete set to a boolean true value.

For instance, the example below will close the session after it has written the bye message back to the client:

        from("mina2:tcp://localhost:8080?sync=true&textline=true").process(new Processor() {
            public void process(Exchange exchange) throws Exception {
                String body = exchange.getIn().getBody(String.class);
                exchange.getOut().setBody("Bye " + body);
                exchange.getOut().setHeader(Mina2Constants.MINA_CLOSE_SESSION_WHEN_COMPLETE, true);
            }
        });

Get the IoSession for message

You can get the IoSession from the message header with this key Mina2Constants.MINA_IOSESSION, and also get the local host address with the key Mina2Constants.MINA_LOCAL_ADDRESS and remote host address with the key Mina2Constants.MINA_REMOTE_ADDRESS.

Configuring Mina filters

Filters permit you to use some Mina Filters, such as SslFilter. You can also implement some customized filters. Please note that codec and logger are also implemented as Mina filters of type, IoFilter. Any filters you may define are appended to the end of the filter chain; that is, after codec and logger.

See Also