Chapter 80. Direct Component

Available as of Camel version 1.0

The direct: component provides direct, synchronous invocation of any consumers when a producer sends a message exchange.
This endpoint can be used to connect existing routes in the same camel context.

Tip

Asynchronous The SEDA component provides asynchronous invocation of any consumers when a producer sends a message exchange.

Tip

Connection to other camel contexts The VM component provides connections between Camel contexts as long they run in the same JVM.

80.1. URI format

direct:someName[?options]

Where someName can be any string to uniquely identify the endpoint

80.2. Options

The Direct component supports 3 options which are listed below.

NameDescriptionDefaultType

block (producer)

If sending a message to a direct endpoint which has no active consumer, then we can tell the producer to block and wait for the consumer to become active.

true

boolean

timeout (producer)

The timeout value to use if block is enabled.

30000

long

resolveProperty Placeholders (advanced)

Whether the component should resolve property placeholders on itself when starting. Only properties which are of String type can use property placeholders.

true

boolean

The Direct endpoint is configured using URI syntax:

direct:name

with the following path and query parameters:

80.2.1. Path Parameters (1 parameters):

NameDescriptionDefaultType

name

Required Name of direct endpoint

 

String

80.2.2. Query Parameters (7 parameters):

NameDescriptionDefaultType

bridgeErrorHandler (consumer)

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.

false

boolean

exceptionHandler (consumer)

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.

 

ExceptionHandler

exchangePattern (consumer)

Sets the default exchange pattern when creating an exchange.

 

ExchangePattern

block (producer)

If sending a message to a direct endpoint which has no active consumer, then we can tell the producer to block and wait for the consumer to become active.

true

boolean

failIfNoConsumers (producer)

Whether the producer should fail by throwing an exception, when sending to a DIRECT endpoint with no active consumers.

false

boolean

timeout (producer)

The timeout value to use if block is enabled.

30000

long

synchronous (advanced)

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

false

boolean

80.3. Samples

In the route below we use the direct component to link the two routes together:

from("activemq:queue:order.in")
    .to("bean:orderServer?method=validate")
    .to("direct:processOrder");

from("direct:processOrder")
    .to("bean:orderService?method=process")
    .to("activemq:queue:order.out");

And the sample using spring DSL:

<route>
 <from uri="activemq:queue:order.in"/>
 <to uri="bean:orderService?method=validate"/>
 <to uri="direct:processOrder"/>
</route>

<route>
 <from uri="direct:processOrder"/>
 <to uri="bean:orderService?method=process"/>
 <to uri="activemq:queue:order.out"/>
</route>

See also samples from the SEDA component, how they can be used together.

80.4. See Also