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Posted to dev@camel.apache.org by "James Strachan (JIRA)" <ji...@apache.org> on 2008/11/03 19:23:05 UTC
[jira] Created: (CAMEL-1048) allow routes to easily be
enabled/disabled based on an external predicate such as queue size
allow routes to easily be enabled/disabled based on an external predicate such as queue size
--------------------------------------------------------------------------------------------
Key: CAMEL-1048
URL: https://issues.apache.org/activemq/browse/CAMEL-1048
Project: Apache Camel
Issue Type: New Feature
Reporter: James Strachan
Fix For: 2.0.0
For example we may want to do this route...
{code}
<route>
<requires>
<el>${broker2.queueSize('AnotherQueue') == 0}</el>
</requires>
<from uri="broker1:MyQueue"/>
<to uri="broker2:AnotherQueue"/>
</route>
{code}
i.e. only implement a specific route while some predicate is true (e.g. only route while a condition is met; disable when its not met).
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[jira] Commented: (CAMEL-1048) allow routes to easily be
enabled/disabled based on an external predicate such as queue size
Posted by "Claus Ibsen (JIRA)" <ji...@apache.org>.
[ https://issues.apache.org/activemq/browse/CAMEL-1048?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=55070#action_55070 ]
Claus Ibsen commented on CAMEL-1048:
------------------------------------
Added an example
camel-example-route-throttling
trunk: 830901.
> allow routes to easily be enabled/disabled based on an external predicate such as queue size
> --------------------------------------------------------------------------------------------
>
> Key: CAMEL-1048
> URL: https://issues.apache.org/activemq/browse/CAMEL-1048
> Project: Apache Camel
> Issue Type: New Feature
> Reporter: James Strachan
> Assignee: Claus Ibsen
> Fix For: 2.1.0
>
>
> For example we may want to do this route...
> {code}
> <route>
> <requires>
> <el>${broker2.queueSize('AnotherQueue') == 0}</el>
> </requires>
> <from uri="broker1:MyQueue"/>
> <to uri="broker2:AnotherQueue"/>
> </route>
> {code}
> i.e. only implement a specific route while some predicate is true (e.g. only route while a condition is met; disable when its not met).
> Maybe we need to allow endpoints to define if they are ready yet? e.g. only send to a certain queue if its got capacity?
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[jira] Resolved: (CAMEL-1048) allow routes to easily be
enabled/disabled based on an external predicate such as queue size
Posted by "Claus Ibsen (JIRA)" <ji...@apache.org>.
[ https://issues.apache.org/activemq/browse/CAMEL-1048?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Claus Ibsen resolved CAMEL-1048.
--------------------------------
Resolution: Fixed
> allow routes to easily be enabled/disabled based on an external predicate such as queue size
> --------------------------------------------------------------------------------------------
>
> Key: CAMEL-1048
> URL: https://issues.apache.org/activemq/browse/CAMEL-1048
> Project: Apache Camel
> Issue Type: New Feature
> Reporter: James Strachan
> Assignee: Claus Ibsen
> Fix For: 2.1.0
>
>
> For example we may want to do this route...
> {code}
> <route>
> <requires>
> <el>${broker2.queueSize('AnotherQueue') == 0}</el>
> </requires>
> <from uri="broker1:MyQueue"/>
> <to uri="broker2:AnotherQueue"/>
> </route>
> {code}
> i.e. only implement a specific route while some predicate is true (e.g. only route while a condition is met; disable when its not met).
> Maybe we need to allow endpoints to define if they are ready yet? e.g. only send to a certain queue if its got capacity?
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[jira] Commented: (CAMEL-1048) allow routes to easily be
enabled/disabled based on an external predicate such as queue size
Posted by "Claus Ibsen (JIRA)" <ji...@apache.org>.
[ https://issues.apache.org/activemq/browse/CAMEL-1048?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=55043#action_55043 ]
Claus Ibsen commented on CAMEL-1048:
------------------------------------
See discussion at
http://www.nabble.com/Discussion---Route-Policy-feature-in-Camel-2.1-td26090277.html
> allow routes to easily be enabled/disabled based on an external predicate such as queue size
> --------------------------------------------------------------------------------------------
>
> Key: CAMEL-1048
> URL: https://issues.apache.org/activemq/browse/CAMEL-1048
> Project: Apache Camel
> Issue Type: New Feature
> Reporter: James Strachan
> Assignee: Claus Ibsen
> Fix For: 2.1.0
>
>
> For example we may want to do this route...
> {code}
> <route>
> <requires>
> <el>${broker2.queueSize('AnotherQueue') == 0}</el>
> </requires>
> <from uri="broker1:MyQueue"/>
> <to uri="broker2:AnotherQueue"/>
> </route>
> {code}
> i.e. only implement a specific route while some predicate is true (e.g. only route while a condition is met; disable when its not met).
> Maybe we need to allow endpoints to define if they are ready yet? e.g. only send to a certain queue if its got capacity?
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[jira] Issue Comment Edited: (CAMEL-1048) allow routes to easily be
enabled/disabled based on an external predicate such as queue size
Posted by "Claus Ibsen (JIRA)" <ji...@apache.org>.
[ https://issues.apache.org/activemq/browse/CAMEL-1048?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=55073#action_55073 ]
Claus Ibsen edited comment on CAMEL-1048 at 11/2/09 3:00 AM:
-------------------------------------------------------------
Add documentation to the wiki and release notes *DONE*
was (Author: davsclaus):
*TODO:* Add documentation to the wiki and release notes
> allow routes to easily be enabled/disabled based on an external predicate such as queue size
> --------------------------------------------------------------------------------------------
>
> Key: CAMEL-1048
> URL: https://issues.apache.org/activemq/browse/CAMEL-1048
> Project: Apache Camel
> Issue Type: New Feature
> Reporter: James Strachan
> Assignee: Claus Ibsen
> Fix For: 2.1.0
>
>
> For example we may want to do this route...
> {code}
> <route>
> <requires>
> <el>${broker2.queueSize('AnotherQueue') == 0}</el>
> </requires>
> <from uri="broker1:MyQueue"/>
> <to uri="broker2:AnotherQueue"/>
> </route>
> {code}
> i.e. only implement a specific route while some predicate is true (e.g. only route while a condition is met; disable when its not met).
> Maybe we need to allow endpoints to define if they are ready yet? e.g. only send to a certain queue if its got capacity?
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[jira] Commented: (CAMEL-1048) allow routes to easily be
enabled/disabled based on an external predicate such as queue size
Posted by "Claus Ibsen (JIRA)" <ji...@apache.org>.
[ https://issues.apache.org/activemq/browse/CAMEL-1048?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=55117#action_55117 ]
Claus Ibsen commented on CAMEL-1048:
------------------------------------
Now you can manage the policy from JMX
trunk: 831859.
> allow routes to easily be enabled/disabled based on an external predicate such as queue size
> --------------------------------------------------------------------------------------------
>
> Key: CAMEL-1048
> URL: https://issues.apache.org/activemq/browse/CAMEL-1048
> Project: Apache Camel
> Issue Type: New Feature
> Reporter: James Strachan
> Assignee: Claus Ibsen
> Fix For: 2.1.0
>
>
> For example we may want to do this route...
> {code}
> <route>
> <requires>
> <el>${broker2.queueSize('AnotherQueue') == 0}</el>
> </requires>
> <from uri="broker1:MyQueue"/>
> <to uri="broker2:AnotherQueue"/>
> </route>
> {code}
> i.e. only implement a specific route while some predicate is true (e.g. only route while a condition is met; disable when its not met).
> Maybe we need to allow endpoints to define if they are ready yet? e.g. only send to a certain queue if its got capacity?
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[jira] Commented: (CAMEL-1048) allow routes to easily be
enabled/disabled based on an external predicate such as queue size
Posted by "Claus Ibsen (JIRA)" <ji...@apache.org>.
[ https://issues.apache.org/activemq/browse/CAMEL-1048?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=55133#action_55133 ]
Claus Ibsen commented on CAMEL-1048:
------------------------------------
Renamed the throttler as we should add another throttler in the future for the messages per time unit style.
trunk: 832342.
> allow routes to easily be enabled/disabled based on an external predicate such as queue size
> --------------------------------------------------------------------------------------------
>
> Key: CAMEL-1048
> URL: https://issues.apache.org/activemq/browse/CAMEL-1048
> Project: Apache Camel
> Issue Type: New Feature
> Reporter: James Strachan
> Assignee: Claus Ibsen
> Fix For: 2.1.0
>
>
> For example we may want to do this route...
> {code}
> <route>
> <requires>
> <el>${broker2.queueSize('AnotherQueue') == 0}</el>
> </requires>
> <from uri="broker1:MyQueue"/>
> <to uri="broker2:AnotherQueue"/>
> </route>
> {code}
> i.e. only implement a specific route while some predicate is true (e.g. only route while a condition is met; disable when its not met).
> Maybe we need to allow endpoints to define if they are ready yet? e.g. only send to a certain queue if its got capacity?
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[jira] Commented: (CAMEL-1048) allow routes to easily be
enabled/disabled based on an external predicate such as queue size
Posted by "Vadim Chekan (JIRA)" <ji...@apache.org>.
[ https://issues.apache.org/activemq/browse/CAMEL-1048?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=47035#action_47035 ]
Vadim Chekan commented on CAMEL-1048:
-------------------------------------
Another use-case: listen to a control queue and start/stop route:
{code}
from control_queue
case when xpath "/headers/message_type"='"stop"
el: ${routes["route_a"].stop}
case when xpath "/headers/message_type"='"start"
el: ${routes["route_a"].start}
{code}
> allow routes to easily be enabled/disabled based on an external predicate such as queue size
> --------------------------------------------------------------------------------------------
>
> Key: CAMEL-1048
> URL: https://issues.apache.org/activemq/browse/CAMEL-1048
> Project: Apache Camel
> Issue Type: New Feature
> Reporter: James Strachan
> Fix For: 2.0.0
>
>
> For example we may want to do this route...
> {code}
> <route>
> <requires>
> <el>${broker2.queueSize('AnotherQueue') == 0}</el>
> </requires>
> <from uri="broker1:MyQueue"/>
> <to uri="broker2:AnotherQueue"/>
> </route>
> {code}
> i.e. only implement a specific route while some predicate is true (e.g. only route while a condition is met; disable when its not met).
> Maybe we need to allow endpoints to define if they are ready yet? e.g. only send to a certain queue if its got capacity?
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[jira] Commented: (CAMEL-1048) allow routes to easily be
enabled/disabled based on an external predicate such as queue size
Posted by "Claus Ibsen (JIRA)" <ji...@apache.org>.
[ https://issues.apache.org/activemq/browse/CAMEL-1048?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=55073#action_55073 ]
Claus Ibsen commented on CAMEL-1048:
------------------------------------
*TODO:* Add documentation to the wiki and release notes
> allow routes to easily be enabled/disabled based on an external predicate such as queue size
> --------------------------------------------------------------------------------------------
>
> Key: CAMEL-1048
> URL: https://issues.apache.org/activemq/browse/CAMEL-1048
> Project: Apache Camel
> Issue Type: New Feature
> Reporter: James Strachan
> Assignee: Claus Ibsen
> Fix For: 2.1.0
>
>
> For example we may want to do this route...
> {code}
> <route>
> <requires>
> <el>${broker2.queueSize('AnotherQueue') == 0}</el>
> </requires>
> <from uri="broker1:MyQueue"/>
> <to uri="broker2:AnotherQueue"/>
> </route>
> {code}
> i.e. only implement a specific route while some predicate is true (e.g. only route while a condition is met; disable when its not met).
> Maybe we need to allow endpoints to define if they are ready yet? e.g. only send to a certain queue if its got capacity?
--
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[jira] Commented: (CAMEL-1048) allow routes to easily be
enabled/disabled based on an external predicate such as queue size
Posted by "Claus Ibsen (JIRA)" <ji...@apache.org>.
[ https://issues.apache.org/activemq/browse/CAMEL-1048?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=54992#action_54992 ]
Claus Ibsen commented on CAMEL-1048:
------------------------------------
And how should the Java DSL syntax be?
We could have requires prelude the from.
{code}
require().el("${broker2.queueSize('AnotherQueue') == 0")
.from("broker1:MyQueue").to("broker2:AnotherQueue");
{code}
> allow routes to easily be enabled/disabled based on an external predicate such as queue size
> --------------------------------------------------------------------------------------------
>
> Key: CAMEL-1048
> URL: https://issues.apache.org/activemq/browse/CAMEL-1048
> Project: Apache Camel
> Issue Type: New Feature
> Reporter: James Strachan
> Fix For: 2.2.0
>
>
> For example we may want to do this route...
> {code}
> <route>
> <requires>
> <el>${broker2.queueSize('AnotherQueue') == 0}</el>
> </requires>
> <from uri="broker1:MyQueue"/>
> <to uri="broker2:AnotherQueue"/>
> </route>
> {code}
> i.e. only implement a specific route while some predicate is true (e.g. only route while a condition is met; disable when its not met).
> Maybe we need to allow endpoints to define if they are ready yet? e.g. only send to a certain queue if its got capacity?
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[jira] Assigned: (CAMEL-1048) allow routes to easily be
enabled/disabled based on an external predicate such as queue size
Posted by "Claus Ibsen (JIRA)" <ji...@apache.org>.
[ https://issues.apache.org/activemq/browse/CAMEL-1048?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Claus Ibsen reassigned CAMEL-1048:
----------------------------------
Assignee: Claus Ibsen
> allow routes to easily be enabled/disabled based on an external predicate such as queue size
> --------------------------------------------------------------------------------------------
>
> Key: CAMEL-1048
> URL: https://issues.apache.org/activemq/browse/CAMEL-1048
> Project: Apache Camel
> Issue Type: New Feature
> Reporter: James Strachan
> Assignee: Claus Ibsen
> Fix For: 2.2.0
>
>
> For example we may want to do this route...
> {code}
> <route>
> <requires>
> <el>${broker2.queueSize('AnotherQueue') == 0}</el>
> </requires>
> <from uri="broker1:MyQueue"/>
> <to uri="broker2:AnotherQueue"/>
> </route>
> {code}
> i.e. only implement a specific route while some predicate is true (e.g. only route while a condition is met; disable when its not met).
> Maybe we need to allow endpoints to define if they are ready yet? e.g. only send to a certain queue if its got capacity?
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[jira] Commented: (CAMEL-1048) allow routes to easily be
enabled/disabled based on an external predicate such as queue size
Posted by "Claus Ibsen (JIRA)" <ji...@apache.org>.
[ https://issues.apache.org/activemq/browse/CAMEL-1048?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=54991#action_54991 ]
Claus Ibsen commented on CAMEL-1048:
------------------------------------
What is needed is also a background task that can run and enable/disable the routes depending on the predicate.
For example we dont want a event driven consumer to be active and consume an incoming message to only find out the predicate was false.
> allow routes to easily be enabled/disabled based on an external predicate such as queue size
> --------------------------------------------------------------------------------------------
>
> Key: CAMEL-1048
> URL: https://issues.apache.org/activemq/browse/CAMEL-1048
> Project: Apache Camel
> Issue Type: New Feature
> Reporter: James Strachan
> Fix For: 2.2.0
>
>
> For example we may want to do this route...
> {code}
> <route>
> <requires>
> <el>${broker2.queueSize('AnotherQueue') == 0}</el>
> </requires>
> <from uri="broker1:MyQueue"/>
> <to uri="broker2:AnotherQueue"/>
> </route>
> {code}
> i.e. only implement a specific route while some predicate is true (e.g. only route while a condition is met; disable when its not met).
> Maybe we need to allow endpoints to define if they are ready yet? e.g. only send to a certain queue if its got capacity?
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[jira] Work started: (CAMEL-1048) allow routes to easily be
enabled/disabled based on an external predicate such as queue size
Posted by "Claus Ibsen (JIRA)" <ji...@apache.org>.
[ https://issues.apache.org/activemq/browse/CAMEL-1048?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Work on CAMEL-1048 started by Claus Ibsen.
> allow routes to easily be enabled/disabled based on an external predicate such as queue size
> --------------------------------------------------------------------------------------------
>
> Key: CAMEL-1048
> URL: https://issues.apache.org/activemq/browse/CAMEL-1048
> Project: Apache Camel
> Issue Type: New Feature
> Reporter: James Strachan
> Assignee: Claus Ibsen
> Fix For: 2.1.0
>
>
> For example we may want to do this route...
> {code}
> <route>
> <requires>
> <el>${broker2.queueSize('AnotherQueue') == 0}</el>
> </requires>
> <from uri="broker1:MyQueue"/>
> <to uri="broker2:AnotherQueue"/>
> </route>
> {code}
> i.e. only implement a specific route while some predicate is true (e.g. only route while a condition is met; disable when its not met).
> Maybe we need to allow endpoints to define if they are ready yet? e.g. only send to a certain queue if its got capacity?
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[jira] Updated: (CAMEL-1048) allow routes to easily be
enabled/disabled based on an external predicate such as queue size
Posted by "Claus Ibsen (JIRA)" <ji...@apache.org>.
[ https://issues.apache.org/activemq/browse/CAMEL-1048?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Claus Ibsen updated CAMEL-1048:
-------------------------------
Fix Version/s: (was: 2.0.0)
2.1.0
> allow routes to easily be enabled/disabled based on an external predicate such as queue size
> --------------------------------------------------------------------------------------------
>
> Key: CAMEL-1048
> URL: https://issues.apache.org/activemq/browse/CAMEL-1048
> Project: Apache Camel
> Issue Type: New Feature
> Reporter: James Strachan
> Fix For: 2.1.0
>
>
> For example we may want to do this route...
> {code}
> <route>
> <requires>
> <el>${broker2.queueSize('AnotherQueue') == 0}</el>
> </requires>
> <from uri="broker1:MyQueue"/>
> <to uri="broker2:AnotherQueue"/>
> </route>
> {code}
> i.e. only implement a specific route while some predicate is true (e.g. only route while a condition is met; disable when its not met).
> Maybe we need to allow endpoints to define if they are ready yet? e.g. only send to a certain queue if its got capacity?
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[jira] Commented: (CAMEL-1048) allow routes to easily be
enabled/disabled based on an external predicate such as queue size
Posted by "Claus Ibsen (JIRA)" <ji...@apache.org>.
[ https://issues.apache.org/activemq/browse/CAMEL-1048?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=55065#action_55065 ]
Claus Ibsen commented on CAMEL-1048:
------------------------------------
First cut committed: 830861.
> allow routes to easily be enabled/disabled based on an external predicate such as queue size
> --------------------------------------------------------------------------------------------
>
> Key: CAMEL-1048
> URL: https://issues.apache.org/activemq/browse/CAMEL-1048
> Project: Apache Camel
> Issue Type: New Feature
> Reporter: James Strachan
> Assignee: Claus Ibsen
> Fix For: 2.1.0
>
>
> For example we may want to do this route...
> {code}
> <route>
> <requires>
> <el>${broker2.queueSize('AnotherQueue') == 0}</el>
> </requires>
> <from uri="broker1:MyQueue"/>
> <to uri="broker2:AnotherQueue"/>
> </route>
> {code}
> i.e. only implement a specific route while some predicate is true (e.g. only route while a condition is met; disable when its not met).
> Maybe we need to allow endpoints to define if they are ready yet? e.g. only send to a certain queue if its got capacity?
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[jira] Updated: (CAMEL-1048) allow routes to easily be
enabled/disabled based on an external predicate such as queue size
Posted by "Claus Ibsen (JIRA)" <ji...@apache.org>.
[ https://issues.apache.org/activemq/browse/CAMEL-1048?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Claus Ibsen updated CAMEL-1048:
-------------------------------
Fix Version/s: (was: 2.2.0)
2.1.0
> allow routes to easily be enabled/disabled based on an external predicate such as queue size
> --------------------------------------------------------------------------------------------
>
> Key: CAMEL-1048
> URL: https://issues.apache.org/activemq/browse/CAMEL-1048
> Project: Apache Camel
> Issue Type: New Feature
> Reporter: James Strachan
> Assignee: Claus Ibsen
> Fix For: 2.1.0
>
>
> For example we may want to do this route...
> {code}
> <route>
> <requires>
> <el>${broker2.queueSize('AnotherQueue') == 0}</el>
> </requires>
> <from uri="broker1:MyQueue"/>
> <to uri="broker2:AnotherQueue"/>
> </route>
> {code}
> i.e. only implement a specific route while some predicate is true (e.g. only route while a condition is met; disable when its not met).
> Maybe we need to allow endpoints to define if they are ready yet? e.g. only send to a certain queue if its got capacity?
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[jira] Commented: (CAMEL-1048) allow routes to easily be
enabled/disabled based on an external predicate such as queue size
Posted by "Claus Ibsen (JIRA)" <ji...@apache.org>.
[ https://issues.apache.org/activemq/browse/CAMEL-1048?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=55122#action_55122 ]
Claus Ibsen commented on CAMEL-1048:
------------------------------------
Added example wiki documentation *DONE*
> allow routes to easily be enabled/disabled based on an external predicate such as queue size
> --------------------------------------------------------------------------------------------
>
> Key: CAMEL-1048
> URL: https://issues.apache.org/activemq/browse/CAMEL-1048
> Project: Apache Camel
> Issue Type: New Feature
> Reporter: James Strachan
> Assignee: Claus Ibsen
> Fix For: 2.1.0
>
>
> For example we may want to do this route...
> {code}
> <route>
> <requires>
> <el>${broker2.queueSize('AnotherQueue') == 0}</el>
> </requires>
> <from uri="broker1:MyQueue"/>
> <to uri="broker2:AnotherQueue"/>
> </route>
> {code}
> i.e. only implement a specific route while some predicate is true (e.g. only route while a condition is met; disable when its not met).
> Maybe we need to allow endpoints to define if they are ready yet? e.g. only send to a certain queue if its got capacity?
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[jira] Updated: (CAMEL-1048) allow routes to easily be
enabled/disabled based on an external predicate such as queue size
Posted by "James Strachan (JIRA)" <ji...@apache.org>.
[ https://issues.apache.org/activemq/browse/CAMEL-1048?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
James Strachan updated CAMEL-1048:
----------------------------------
Description:
For example we may want to do this route...
{code}
<route>
<requires>
<el>${broker2.queueSize('AnotherQueue') == 0}</el>
</requires>
<from uri="broker1:MyQueue"/>
<to uri="broker2:AnotherQueue"/>
</route>
{code}
i.e. only implement a specific route while some predicate is true (e.g. only route while a condition is met; disable when its not met).
Maybe we need to allow endpoints to define if they are ready yet? e.g. only send to a certain queue if its got capacity?
was:
For example we may want to do this route...
{code}
<route>
<requires>
<el>${broker2.queueSize('AnotherQueue') == 0}</el>
</requires>
<from uri="broker1:MyQueue"/>
<to uri="broker2:AnotherQueue"/>
</route>
{code}
i.e. only implement a specific route while some predicate is true (e.g. only route while a condition is met; disable when its not met).
> allow routes to easily be enabled/disabled based on an external predicate such as queue size
> --------------------------------------------------------------------------------------------
>
> Key: CAMEL-1048
> URL: https://issues.apache.org/activemq/browse/CAMEL-1048
> Project: Apache Camel
> Issue Type: New Feature
> Reporter: James Strachan
> Fix For: 2.0.0
>
>
> For example we may want to do this route...
> {code}
> <route>
> <requires>
> <el>${broker2.queueSize('AnotherQueue') == 0}</el>
> </requires>
> <from uri="broker1:MyQueue"/>
> <to uri="broker2:AnotherQueue"/>
> </route>
> {code}
> i.e. only implement a specific route while some predicate is true (e.g. only route while a condition is met; disable when its not met).
> Maybe we need to allow endpoints to define if they are ready yet? e.g. only send to a certain queue if its got capacity?
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