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https://issues.apache.org/jira/browse/LANG-577?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13101608#comment-13101608
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Joerg Schaible commented on LANG-577:
-------------------------------------
What still nags me, is the different purpose. ObjectReference<T> emphasizes the
storage while Mutable<T> stands for a primitive type that can be modified.
Although the pure interfaces are technically nearly the same, I doubt that
anybody will look for Mutable<T> when a ObjectReference<T> is needed.
> Add ObjectReference interface and two implementations
> -----------------------------------------------------
>
> Key: LANG-577
> URL: https://issues.apache.org/jira/browse/LANG-577
> Project: Commons Lang
> Issue Type: New Feature
> Components: lang.*
> Reporter: Joerg Schaible
> Assignee: Joerg Schaible
> Priority: Minor
> Fix For: 3.x
>
> Attachments: reference.diff
>
>
> In some situations it would be helpful to use a reference to an object, e.g.
> for parameters by reference
> {code:java}
> void doSomething(ObjectReference<String> ref) {
> ref.set("Hello");
> }
> {code}
> or for anonymous methods
> {code:java}
> final ObjectReference<String> ref = new MemoryReference<String>();
> final Runnable r = new Runnable() {
> void run() {
> ref.set("Hello");
> }
> }
> r.run();
> {code}
> Additionally it is sometimes useful to keep the reference in other places
> than in shared memory, e.g. in a ThreadLocal or in case of a web application
> in a scoped reference or even in combination with some other persistence
> mechanism. Basically I am proposing the interface ObjectReference:
> {code:Java}
> /**
> * Interface to reference an object.
> *
> * @param <T> the type of the referenced object
> * @author Apache Software Foundation
> * @since 3.0
> */
> public interface ObjectReference<T> {
> /**
> * Getter for the referenced object.
> *
> * @return the object or <code>null</code>
> */
> T get();
> /**
> * Setter for the reference.
> *
> * @param object the object to reference (may be <code>null</code>)
> */
> void set(T object);
> }
> {code}
> and the two implementations MemoryReference and ThreadLocalReference in the
> new package org.apache.commons.lang3.reference. I've seen such or similar
> types in various libraries.
> Comments?
> Unit test will be provided also.
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