Apache Camel Blueprint DSL - Adding reference to property file (.cfg/.properties) as blueprint property placeholders

Apache Camel Blueprint DSL Adding reference to property file (.cfg or .properties) as blueprint property placeholders.md

Took me 8 days to figured it out :(

Reference: https://camel.apache.org/manual/latest/using-propertyplaceholder.html#UsingPropertyPlaceholder-Usinga.cfgor.propertiesFileForBlueprintPropertyPlaceholders

For this example, we assumed the we are using trial.blueprint.cfg file which is saved at the [FUSE_FOLDER]/etc/trial.blueprint.cfg

• [FUSE_FOLDER]/etc/trial.blueprint.cfg content;

    in.server.host=//localhost
    in.server.port=9002
    in.server.protocol=http
    in.server.uri.pattern=employee
    out.server.host=//localhost
    out.server.port=9002
    out.server.protocol=http
    out.server.uri.pattern=external/callmoko/api
  

• Open blueprint.xml on Source tab

• We need to add to entries to recognized our property file

  1. Adding xmlns:cm to the blueprint tag
  • From:

  <blueprint xmlns="http://www.osgi.org/xmlns/blueprint/v1.0.0"
  xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.osgi.org/xmlns/blueprint/v1.0.0 https://www.osgi.org/xmlns/blueprint/v1.0.0/blueprint.xsd                            http://camel.apache.org/schema/blueprint https://camel.apache.org/schema/blueprint/camel-blueprint.xsd">
  

  • To:

  <blueprint xmlns="http://www.osgi.org/xmlns/blueprint/v1.0.0"
  xmlns:cm="http://aries.apache.org/blueprint/xmlns/blueprint-cm/v1.1.0"
  xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.osgi.org/xmlns/blueprint/v1.0.0 https://www.osgi.org/xmlns/blueprint/v1.0.0/blueprint.xsd                            http://camel.apache.org/schema/blueprint https://camel.apache.org/schema/blueprint/camel-blueprint.xsd">
  

  2. Adding the actual code to enable our property file, add below code above the <camelContext id=" tag

  <!-- blueprint property placeholders, that will use etc/stuff.cfg as the properties file -->
  <cm:property-placeholder persistent-id="trial.blueprint" update-strategy="reload"/>
  

  3. The whole blueprint.xml code example would be;

  <?xml version="1.0" encoding="UTF-8"?>
  <blueprint xmlns="http://www.osgi.org/xmlns/blueprint/v1.0.0"
    xmlns:cm="http://aries.apache.org/blueprint/xmlns/blueprint-cm/v1.1.0"
      xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.osgi.org/xmlns/blueprint/v1.0.0 https://www.osgi.org/xmlns/blueprint/v1.0.0/blueprint.xsd                            http://camel.apache.org/schema/blueprint https://camel.apache.org/schema/blueprint/camel-blueprint.xsd">
      <!-- blueprint property placeholders, that will use etc/trial.blueprint.cfg as the properties file -->
      <cm:property-placeholder persistent-id="trial.blueprint" update-strategy="reload"/>
      <camelContext id="_context1" xmlns="http://camel.apache.org/schema/blueprint">
          <route id="_route1"/>
      </camelContext>
  </blueprint>
  

• To use, {{in.server.host}} or {{out.server.protocol}}