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From "Aaron Hamid (JIRA)" <axis-...@ws.apache.org>
Subject [jira] Commented: (AXIS-2073) MessageContext getPropertyNames is broken
Date Tue, 21 Jun 2005 20:26:18 GMT
    [ http://issues.apache.org/jira/browse/AXIS-2073?page=comments#action_12314171 ] 

Aaron Hamid commented on AXIS-2073:
-----------------------------------

Hi guys, can we make the implementation of getAllPropertyNames the default for getPropertyNames?
 Is there a reason to not expose all keys in the MessageContext getPropertyNames (as even
they are accessible through getProperty())?

For example, I have a JAX-RPC style handler like this:

public boolean handleRequest(javax.xml.rpc.handler.MessageContext context) {
    Iterator it = context.getPropertyNames();
    HashMap map = new HashMap();
    while (it.hasNext()) {
      String s = (String) it.next();
      map.put(s, context.getProperty(s));
    }
    ...
}

and a client which does:

MyApp app = new MyAppLocator().getMyApp();
app._setProperty("foo", "bar");

The result is that any property set on the stub (e.g. "foo") will not be visible in MessageContext
object presented to the handler (even though it will be accessible through getProperty()).
 Since javax.xml.rpc.handler.Message context only exposes getPropertyNames(), I must cast
to the Apache implementation in order to call getAllPropertyNames.  Can we just make that
implementation the default?

Here's a from-memory patch:

-    /**
-     * Returns an <code>Iterator</code> view of the names of the properties in
-     * this <code>MessageContext</code>.
-     *
-     * @return an <code>Iterator</code> over all property names
-     */
-    public java.util.Iterator getPropertyNames() {
-        // fixme: this is potentially unsafe for the caller - changing the
-        //  properties will kill the iterator. Consider iterating over a copy:
-        // return new HashSet(bag.keySet()).iterator();
-        return bag.keySet().iterator();
-    }
-
    /**
     *  Returns an Iterator view of the names of the properties 
     *  in this MessageContext and any parents of the LockableHashtable
     *  @return Iterator for the property names
     */
-    public java.util.Iterator getAllPropertyNames() {
+    public java.util.Iterator getPropertyNames() {
        return bag.getAllKeys().iterator();
    }

Note that this (somewhat) resolves the issue in the comment of the old getPropertyNames()
because the implementation of getAllKeys() performs a copy of the key set.  Also note that
this patch is not particularly sensitive to preserving semantics in some backward-compatible
way...one may want to preserve the existing functionality of getPropertyNames under something
like getImmediatePropertyNames, but my hunch is that this has no value).

> MessageContext getPropertyNames is broken
> -----------------------------------------
>
>          Key: AXIS-2073
>          URL: http://issues.apache.org/jira/browse/AXIS-2073
>      Project: Apache Axis
>         Type: Bug
>   Components: Basic Architecture
>     Versions: 1.1
>  Environment: Operating System: Other
> Platform: Other
>     Reporter: Aaron Hamid
>     Assignee: Axis Developers Mailing List

>
> The getPropertyNames() call on the MessageContext object made available to a 
> jax-rpc GenericHandler subclass handler in handleRequest() does NOT enumerate 
> all the property names.  getProperty() calls will return values for properties 
> which have been set, but are NOT visible through getPropertyNames().
> My hunch is that since the get() call on LockableHashtable inspects the parent 
> Hashtable, that the keySet() method, which is not overridden, does NOT inspect 
> the parent Hashtable, and is returning an empty keyset.
> For my test, properties are set using the _setProperty() call on either a 
> client Stub object, or Call object.

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