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From ahgittin <>
Subject [GitHub] incubator-brooklyn pull request: Flesh out type creation using the...
Date Tue, 17 Nov 2015 10:06:41 GMT
Github user ahgittin commented on a diff in the pull request:
    --- Diff: api/src/main/java/org/apache/brooklyn/api/typereg/
    @@ -45,24 +45,25 @@
         /** @return The item matching the given given 
          * {@link RegisteredType#getSymbolicName() symbolicName} 
          * and optionally {@link RegisteredType#getVersion()},
    -     * filtered for the optionally supplied {@link RegisteredTypeConstraint}, 
    +     * filtered for the optionally supplied {@link RegisteredTypeLoadingContext}, 
          * taking the best version if the version is null or a default marker,
          * returning null if no matches are found. */
    -    RegisteredType get(String symbolicName, String version, @Nullable RegisteredTypeConstraint
    -    /** as {@link #get(String, String, RegisteredTypeConstraint)} with no constraints
    +    RegisteredType get(String symbolicName, String version, @Nullable RegisteredTypeLoadingContext
    +    /** as {@link #get(String, String, RegisteredTypeLoadingContext)} with no constraints
         RegisteredType get(String symbolicName, String version);
    -    /** as {@link #get(String, String, RegisteredTypeConstraint)} but allows <code>"name:version"</code>

    +    /** as {@link #get(String, String, RegisteredTypeLoadingContext)} but allows <code>"name:version"</code>

          * (the {@link RegisteredType#getId()}) in addition to the unversioned name,
          * using a default marker if no version can be inferred */
    -    RegisteredType get(String symbolicNameWithOptionalVersion, @Nullable RegisteredTypeConstraint
    -    /** as {@link #get(String, RegisteredTypeConstraint)} but with no constraints */
    +    RegisteredType get(String symbolicNameWithOptionalVersion, @Nullable RegisteredTypeLoadingContext
    --- End diff --
    You're right.
    In general it serves a few purposes:
    * it supplies class-loading context
    * it helps with recursive resolution (`alreadyEncounteredType`)
    * it prevents returning incompatible classes
    But none of them are needed for a lookup.  Maybe we should remove; I'll look at that.
    BTW correct that we don't allow different instances of the same symbolic name+version.
 However i have in my mind a concept of `aliases` which types could declare, and those could
conflict, so if looking up an alias the context could be useful.

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