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Chapter 146. Timer

Only consumer is supported

The Timer component is used to generate message exchanges when a timer fires You can only consume events from this endpoint.

146.1. Dependencies

When using timer with Red Hat build of Camel Spring Boot make sure to use the following Maven dependency to have support for auto configuration: 

<dependency>
  <groupId>org.apache.camel.springboot</groupId>
  <artifactId>camel-timer-starter</artifactId>
</dependency>
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146.2. URI format

timer:name[?options]
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Where name is the name of the Timer object, which is created and shared across endpoints. So if you use the same name for all your timer endpoints, only one Timer object and thread will be used.

Note

The IN body of the generated exchange is null. So exchange.getIn().getBody() returns null.

Note

Advanced Scheduler
See also the Quartz component that supports much more advanced scheduling.

146.3. Configuring Options

Camel components are configured on two separate levels:

  • component level
  • endpoint level

146.3.1. Configuring Component Options

At the component level, you set general and shared configurations that are, then, inherited by the endpoints. It is the highest configuration level. For example, a component may have security settings, credentials for authentication, urls for network connection and so forth. Some components only have a few options, and others may have many. Because components typically have pre-configured defaults that are commonly used, then you may often only need to configure a few options on a component; or none at all.

You can configure components using:

  • the Component DSL.
  • in a configuration file (application.properties, *.yaml files, etc).
  • directly in the Java code.

146.3.2. Configuring Endpoint Options

You usually spend more time setting up endpoints because they have many options. These options help you customize what you want the endpoint to do. The options are also categorized into whether the endpoint is used as a consumer (from), as a producer (to), or both.

Configuring endpoints is most often done directly in the endpoint URI as path and query parameters. You can also use the Endpoint DSL and DataFormat DSL as a type safe way of configuring endpoints and data formats in Java.

A good practice when configuring options is to use Property Placeholders.

Property placeholders provide a few benefits:

  • They help prevent using hardcoded urls, port numbers, sensitive information, and other settings.
  • They allow externalizing the configuration from the code.
  • They help the code to become more flexible and reusable.

The following two sections list all the options, firstly for the component followed by the endpoint.

146.4. Component Options

The Timer component supports 2 options, which are listed below.

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 or ERROR level and ignored.

false

boolean

autowiredEnabled (advanced)

Whether autowiring is enabled. This is used for automatic autowiring options (the option must be marked as autowired) by looking up in the registry to find if there is a single instance of matching type, which then gets configured on the component. This can be used for automatic configuring JDBC data sources, JMS connection factories, AWS Clients, etc.

true

boolean

146.5. Endpoint Options

The Timer endpoint is configured using URI syntax: 

timer:timerName
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with the following path and query parameters:

146.5.1. Path Parameters (1 parameters)

NameDescriptionDefaultType

timerName (consumer)

Required The name of the timer.

 

String

146.5.2. Query Parameters (13 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 or ERROR level and ignored.

false

boolean

delay (consumer)

Delay before first event is triggered.

1000

long

fixedRate (consumer)

Events take place at approximately regular intervals, separated by the specified period.

false

boolean

includeMetadata (consumer)

Whether to include metadata in the exchange such as fired time, timer name, timer count etc. This information is default included.

true

boolean

period (consumer)

If greater than 0, generate periodic events every period.

1000

long

repeatCount (consumer)

Specifies a maximum limit of number of fires. So if you set it to 1, the timer will only fire once. If you set it to 5, it will only fire five times. A value of zero or negative means fire forever.

 

long

exceptionHandler (consumer (advanced))

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

 

ExceptionHandler

exchangePattern (consumer (advanced))

Sets the exchange pattern when the consumer creates an exchange.

Enum values:

  • InOnly
  • InOut
  • InOptionalOut
 

ExchangePattern

daemon (advanced)

Specifies whether or not the thread associated with the timer endpoint runs as a daemon. The default value is true.

true

boolean

pattern (advanced)

Allows you to specify a custom Date pattern to use for setting the time option using URI syntax.

 

String

synchronous (advanced)

Sets whether synchronous processing should be strictly used.

false

boolean

time (advanced)

A java.util.Date the first event should be generated. If using the URI, the pattern expected is: yyyy-MM-dd HH:mm:ss or yyyy-MM-dd’T’HH:mm:ss.

 

Date

timer (advanced)

To use a custom Timer.

 

Timer

146.6. Exchange Properties

When the timer is fired, it adds the following information as properties to the Exchange:

NameTypeDescription

Exchange.TIMER_NAME

String

The value of the name option.

Exchange.TIMER_TIME

Date

The value of the time option.

Exchange.TIMER_PERIOD

long

The value of the period option.

Exchange.TIMER_FIRED_TIME

Date

The time when the consumer fired.

Exchange.TIMER_COUNTER

Long

The current fire counter. Starts from 1.

146.7. Sample

To set up a route that generates an event every 60 seconds: 

from("timer://foo?fixedRate=true&period=60000").to("bean:myBean?method=someMethodName");
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The above route will generate an event and then invoke the someMethodName method on the bean called myBean in the Registry.

And the route in Spring DSL: 

<route>
  <from uri="timer://foo?fixedRate=true&amp;period=60000"/>
  <to uri="bean:myBean?method=someMethodName"/>
</route>
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146.8. Firing as soon as possible

Since Camel 2.17

You may want to fire messages in a Camel route as soon as possible you can use a negative delay: 

<route>
  <from uri="timer://foo?delay=-1"/>
  <to uri="bean:myBean?method=someMethodName"/>
</route>
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In this way the timer will fire messages immediately.

You can also specify a repeatCount parameter in conjunction with a negative delay to stop firing messages after a fixed number has been reached.

If you don’t specify a repeatCount then the timer will continue firing messages until the route will be stopped.

146.9. Firing only once

You may want to fire a message in a Camel route only once, such as when starting the route. To do that you use the repeatCount option as shown: 

<route>
  <from uri="timer://foo?repeatCount=1"/>
  <to uri="bean:myBean?method=someMethodName"/>
</route>
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146.10. Spring Boot Auto-Configuration

The component supports 3 options, which are listed below.

NameDescriptionDefaultType

camel.component.timer.autowired-enabled

Whether autowiring is enabled. This is used for automatic autowiring options (the option must be marked as autowired) by looking up in the registry to find if there is a single instance of matching type, which then gets configured on the component. This can be used for automatic configuring JDBC data sources, JMS connection factories, AWS Clients, etc.

true

Boolean

camel.component.timer.bridge-error-handler

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 or ERROR level and ignored.

false

Boolean

camel.component.timer.enabled

Whether to enable auto configuration of the timer component. This is enabled by default.

 

Boolean

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