dsmiley commented on code in PR #2474:
URL: https://github.com/apache/solr/pull/2474#discussion_r1611670535
##########
solr/core/src/java/org/apache/solr/servlet/CoreContainerProvider.java:
##########
@@ -93,69 +87,69 @@ public class CoreContainerProvider implements
ServletContextListener {
private HttpClient httpClient;
private SolrMetricManager metricManager;
private RateLimitManager rateLimitManager;
- private final CountDownLatch init = new CountDownLatch(1);
private String registryName;
- // AFAIK the only reason we need this is to support JettySolrRunner for
tests. In tests we might
- // have multiple CoreContainers in the same JVM, but I *think* that doesn't
happen in a real
- // server.
- private static final Map<ContextInitializationKey, ServiceHolder> services =
- Collections.synchronizedMap(new WeakHashMap<>());
-
- // todo: dependency injection instead, but for now this method and the
associated map will have
- // to suffice.
- // Note that this relies on ServletContext.equals() not implementing
anything significantly
- // different than Object.equals for its .equals method (I've found no
implementation that even
- // implements it).
- public static ServiceHolder serviceForContext(ServletContext ctx) throws
InterruptedException {
- ContextInitializationKey key = new ContextInitializationKey(ctx);
- return services.computeIfAbsent(key, ServiceHolder::new);
+
+ /** Acquires an instance from the context, waiting if necessary. */
+ public static CoreContainerProvider serviceForContext(ServletContext ctx)
+ throws InterruptedException {
+ long startWait = System.nanoTime();
+ synchronized (ctx) {
Review Comment:
Based on the initialization sequence that I'm coming to learn, I suspected
that this code doesn't even have to wait and I was right! I added an assert
before ctx.wait and it never tripped. Ha!
Maybe this is controversial but I'm tempted to remove this code (and the
"notify" code elsewhere) and replace it with a lookup that on non-existence
throws an IllegalStateException claiming that the ServletContextListener should
have done its job by then. If it didn't, something is seriously wrong.
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