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https://issues.apache.org/jira/browse/LANG-1611?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17264566#comment-17264566
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Andrey Fadeev edited comment on LANG-1611 at 1/14/21, 3:16 AM:
---------------------------------------------------------------
If there's only one token for an Initializer instance, why not trigger
initialization simply by calling the get() method, like in the
\{{AtomicInitializer but using check for expiration instead of a }}null?
was (Author: andrey fadeev):
If there's only one token for an Initializer instance, why not trigger
initialization simply by calling the get() method, like in the
{{AtomicInitializer but using check for expiration instead of a }}null?
{quote}{color:#bbb529}@Override
{color}{color:#cc7832}public {color}{color:#507874}T
{color}{color:#ffc66d}get{color}() {color:#cc7832}throws
{color}ConcurrentException {
{color:#507874}T {color}result =
{color:#9876aa}reference{color}.get(){color:#cc7832};
{color}{color:#cc7832}
{color}{color:#cc7832} if {color}(result == {color:#cc7832}null{color}) {
result = initialize(){color:#cc7832};
{color}{color:#cc7832} if
{color}(!{color:#9876aa}reference{color}.compareAndSet({color:#cc7832}null,
{color}result)) {
{color:#808080}// another thread has initialized the reference
{color} result = {color:#9876aa}reference{color}.get(){color:#cc7832};
{color} }
}
{color:#cc7832}return {color}result{color:#cc7832};
{color}}
{quote}
> Add an initializer which can compare and re-initialize value
> ------------------------------------------------------------
>
> Key: LANG-1611
> URL: https://issues.apache.org/jira/browse/LANG-1611
> Project: Commons Lang
> Issue Type: New Feature
> Components: lang.concurrent.*
> Reporter: Franz Wong
> Priority: Minor
>
> I would like to have a new class which is similar to
> {{AtomicSafeInitializer}}. But we can compare and re-initialize the value.
> The use case is to refresh access token (e.g. OAuth) when it expires.
> Multiple threads tries to refresh the same token at the same time, but there
> should be only one thread to do it, in addition, only the thread which passes
> the expired token can trigger the initialization.
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