[jira] [Created] (BROOKLYN-329) $brooklyn:config hangs, rather than getting default brooklyn.parameter value

["Aled Sage (JIRA)" <ji...@apache.org>]

Aled Sage created BROOKLYN-329:
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             Summary: $brooklyn:config hangs, rather than getting default brooklyn.parameter value
                 Key: BROOKLYN-329
                 URL: https://issues.apache.org/jira/browse/BROOKLYN-329
             Project: Brooklyn
          Issue Type: Bug
            Reporter: Aled Sage
            Priority: Minor


Using 0.10.0-SNAPSHOT...

I wrote a YAML entity where CouchDB was configured with an initial username/password, and another app that included CouchDB would inject it.

In each blueprint, I defined a brooklyn.parameter with a default value for the username/password. I used the same config key name in each.

However, when I ran my blueprint it hung. The CouchDB was waiting forever for the username/password config value.

I recreated this behaviour in the simpler test case below (which I'll add to {{ConfigParametersYamlTest}}).

The workaround is to use a different name for the config key in each blueprint. For example, in the outer blueprint above if youchange the name to {{my.param.key2}} then the test passes.

Debugging it, one surprising thing I noticed is that {{scopeRoot()}} evaluates to be "entity-with-tests" rather than {{wrapper-entity}}.

{noformat}
public void testConfigParameterPassedFromOuterConfigParameter() throws Exception {
    addCatalogItems(
            "brooklyn.catalog:",
            "  itemType: entity",
            "  items:",
            "  - id: entity-with-keys",
            "    item:",
            "      type: "+TestEntity.class.getName(),
            "      brooklyn.parameters:",
            "      - name: my.param.key",
            "        type: string",
            "        default: myDefaultVal",
            "      brooklyn.config:",
            "        my.other.key: $brooklyn:config(\"my.param.key\")");

    addCatalogItems(
            "brooklyn.catalog:",
            "  itemType: entity",
            "  items:",
            "  - id: wrapper-entity",
            "    item:",
            "      brooklyn.parameters:",
            "      - name: my.param.key",
            "        type: string",
            "        default: myDefaultValInOuter",
            "      type: entity-with-keys",
            "      brooklyn.config:",
            "        my.param.key: $brooklyn:scopeRoot().config(\"my.param.key\")");
    
    String yaml = Joiner.on("\n").join(
            "services:",
            "- type: wrapper-entity");
    
    Entity app = createStartWaitAndLogApplication(yaml);
    final TestEntity entity = (TestEntity) Iterables.getOnlyElement(app.getChildren());
    Asserts.assertReturnsEventually(new Runnable() {
        public void run() {
            assertEquals(entity.config().get(ConfigKeys.newStringConfigKey("my.other.key")), "myDefaultValInOuter");
        }},
        Asserts.DEFAULT_LONG_TIMEOUT);
}
{noformat}




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