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Chapter 83. 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.
Asynchronous The SEDA component provides asynchronous invocation of any consumers when a producer sends a message exchange.
Connection to other camel contexts The VM component provides connections between Camel contexts as long they run in the same JVM.
83.1. URI format
direct:someName[?options]
Where someName can be any string to uniquely identify the endpoint
83.2. Options
The Direct component supports 3 options, which are listed below.
| Name | Description | Default | Type |
|---|---|---|---|
| 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:
83.2.1. Path Parameters (1 parameters):
| Name | Description | Default | Type |
|---|---|---|---|
| name | Required Name of direct endpoint | String |
83.2.2. Query Parameters (7 parameters):
| Name | Description | Default | Type |
|---|---|---|---|
| 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 |
83.3. 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.
