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<p style="margin: 10px 0 0 0"><a href="http://jira.qos.ch/secure/ViewProfile.jspa?name=jamezp" class="user-hover" rel="jamezp" style="color: #3b73af; text-decoration: none">James R. Perkins</a> writes:</p>
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<p style="margin: 10px 0 0 0">That said I still don't understand why initialization just can't be thread-safe. Using SubstitueLoggers and what not just hides the issue. The bottom line is initialization of a binder is not thread-safe and I see no reason why it shouldn't be. If it's just made thread-safe there is no need for all this substitute logger code.</p>
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<p style="margin: 10px 0 0 0">As <a href="http://jira.qos.ch/secure/ViewProfile.jspa?name=chetan.mehrotra%40gmail.com" class="user-hover" rel="chetan.mehrotra@gmail.com" style="color: #3b73af; text-decoration: none">Chetan Mehrotra</a> mentioned, with <a href="http://jira.qos.ch/browse/SLF4J-302" title="Enable swapping of NOPLogger in SubstituteLoggerFactory" class="issue-link" data-issue-key="SLF4J-302" style="color: #3b73af; text-decoration: none"></a></p>
<del>
SLF4J-302
</del> fixed in release of SLF4J version 1.7.6 dated February 5th, 2014, Logger.FActory.TEMP_FACTORY emits <tt>SubstituteLoggers</tt> instances during the initialization phase. Once initialization is complete, <tt>SubstituteLogger</tt> instances delegate to regular loggers. Thus, it is only during the initialization phase that <tt>SubstituteLogger</tt> instances behave as NOPLoggers.
<p style="margin: 10px 0 0 0">As for thread safeness of read/writes of the INITIALIZATION_STATE variable, I have made the following change, essentially a double-check lock on an int:</p>
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<pre class="code-java" style="margin: 10px 0 0 0; max-height: 30em; overflow: auto; white-space: pre-wrap; word-wrap: normal">
<span class="code-keyword" style="color: #000091">public</span> <span class="code-keyword" style="color: #000091">static</span> ILoggerFactory getILoggerFactory() {
<span class="code-keyword" style="color: #000091">if</span> (INITIALIZATION_STATE == UNINITIALIZED) {
<span class="code-keyword" style="color: #000091">synchronized</span> (LoggerFactory.class) {
<span class="code-keyword" style="color: #000091">if</span> (INITIALIZATION_STATE == UNINITIALIZED) {
INITIALIZATION_STATE = ONGOING_INITIALIZATION;
performInitialization();
}
}
}
.. same as before
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<p style="margin: 10px 0 0 0">which can also be seen in <a href="https://github.com/qos-ch/slf4j/commit/c5ae99166815?diff=unified#diff-4a1243aa73cedaa0456b01f5eb7a484e" class="external-link" rel="nofollow" style="color: #3b73af; text-decoration: none">commit c5ae991</a>. </p>
<p style="margin: 10px 0 0 0">Please let me know if this change makes any difference.</p>
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