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Timer
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Component
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The
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timer:
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component
...
is
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used
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to
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generate
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message
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exchanges
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when
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a
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timer
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fires
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You
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can
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only
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consume
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events
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from
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this
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endpoint.
URI format
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h3. URI format {code} timer:name[?options] {code} 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. You can append query options to the URI in the following format, {{ |
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.
You can append query options to the URI in the following format, ?option=value&option=value&...
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Note:
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The
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IN
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body
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of
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the
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generated
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exchange
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is
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null
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.
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So
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exchange.getIn().getBody()
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returns
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null
...
.
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}
See also the []component that supports much more advanced scheduling. {tip} {tip:title=Specify time in human friendly format} In *Camel 2.3* onwards you can specify the time in [human friendly syntax|How do I specify time period in a human friendly syntax]. {tip} h3. Options {div:class=confluenceTableSmall} || Name || Default Value || Description || | {{time}} | {{null}} | 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 {{ |
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In Camel 2.3 onwards you can specify the time in human friendly syntax. |
Options
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Exchange Properties
When the timer is fired, it adds the following information as properties to the Exchange
:
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Message Headers
When the timer is fired, it adds the following information as headers to the IN message
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Sample
To set up a route that generates an event every 60 seconds:
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}}. | | {{pattern}} | {{null}} | Allows you to specify a custom {{Date}} pattern to use for setting the time option using URI syntax. | | {{period}} | {{1000}} | If greater than 0, generate periodic events every {{period}} milliseconds. | | {{delay}} | {{0}} / {{1000}} | The number of milliseconds to wait before the first event is generated. Should not be used in conjunction with the {{time}} option. The default value has bee n changed to {{1000}} from *Camel 2.11* onwards. In older releases the default value is {{0}} what randomly cause the issue the timer is not executed the first time (it is executed the first time after {{period}} of time or never, if {{period}} is 0). This is by design of the {{java.util.TaskQueue}} we use under the cover. | | {{fixedRate}} | {{false}} | Events take place at approximately regular intervals, separated by the specified period. | | {{daemon}} | {{true}} | Specifies whether or not the thread associated with the timer endpoint runs as a daemon. | | {{repeatCount}} | {{0}} | *Camel 2.8:* 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. | {div} h3. Exchange Properties When the timer is fired, it adds the following information as properties to the {{Exchange}}: {div:class=confluenceTableSmall} || Name || Type || Description || | {{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}} | *Camel 2.8:* The current fire counter. Starts from 1. | {div} h3. Message Headers When the timer is fired, it adds the following information as headers to the IN message {div:class=confluenceTableSmall} || Name || Type || Description || | {{Exchange.TIMER_FIRED_TIME}} | {{java.util.Date}} | The time when the consumer fired | {div} h3. Sample To set up a route that generates an event every 60 seconds: {code:java} from("timer://foo?fixedRate=true&period=60000").to("bean:myBean?method=someMethodName"); {code} {tip} Instead of 60000 you can use |
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Instead of 60000 you can use period=60s which is more friendly to read. |
The above route will generate an event and then invoke the someMethodName
method on the bean called myBean
in the Registry such as JNDI or Spring.
And the route in Spring DSL:
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{tip}
The above route will generate an event and then invoke the {{someMethodName}} method on the bean called {{myBean}} in the [Registry] such as JNDI or [Spring].
And the route in Spring DSL:
{code:xml}
<route>
<from uri="timer://foo?fixedRate=true&period=60000"/>
<to uri="bean:myBean?method=someMethodName"/>
</route>
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Firing as soon as possible
Available as of Camel 2.17
You may want to fire messages in a Camel route as soon as possible you can use a negative delay:
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<route>
<from uri="timer://foo?delay=-1"/>
<to uri="bean:myBean?method=someMethodName"/>
</route> |
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.
Firing only once
Available as of Camel 2.8
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:
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{code} h4. Firing only once *Available as of Camel 2.8* 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: {code:xml} <route> <from uri="timer://foo?repeatCount=1"/> <to uri="bean:myBean?method=someMethodName"/> </route> {code} {include:Endpoint See Also} * [Quartz] |
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