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stash in a static field, the list set of topLevel classes (performance gain for setups where this class is called multiple times (along with clearing that cache during a javalin instance hotswap)

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darin.kelkhoff
2024-05-10 12:24:29 -05:00
parent 81a5d868b6
commit 196488ad6e
2 changed files with 41 additions and 3 deletions
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32
qqq-backend-core/src/main/java/com/kingsrook/qqq/backend/core/model/metadata/MetaDataProducerHelper.java
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@ -30,6 +30,7 @@ import java.util.Comparator;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import com.google.common.collect.ImmutableSet;
import com.google.common.reflect.ClassPath;
import com.kingsrook.qqq.backend.core.exceptions.QException;
import com.kingsrook.qqq.backend.core.logging.QLogger;
@ -50,6 +51,8 @@ public class MetaDataProducerHelper
private static Map<Class<?>, Integer> comparatorValuesByType = new HashMap<>();
private static Integer defaultComparatorValue;
private static ImmutableSet<ClassPath.ClassInfo> topLevelClasses;
static
{
////////////////////////////////////////////////////////////////////////////////////////
@ -70,8 +73,6 @@ public class MetaDataProducerHelper
comparatorValuesByType.put(QAppMetaData.class, 23);
}
/*******************************************************************************
** Recursively find all classes in the given package, that implement MetaDataProducerInterface
** run them, and add their output to the given qInstance.
@ -186,7 +187,7 @@ public class MetaDataProducerHelper
List<Class<?>> classes = new ArrayList<>();
ClassLoader loader = Thread.currentThread().getContextClassLoader();
for(ClassPath.ClassInfo info : ClassPath.from(loader).getTopLevelClasses())
for(ClassPath.ClassInfo info : getTopLevelClasses(loader))
{
if(info.getName().startsWith(packageName))
{
@ -197,4 +198,29 @@ public class MetaDataProducerHelper
return (classes);
}
/*******************************************************************************
**
*******************************************************************************/
private static ImmutableSet<ClassPath.ClassInfo> getTopLevelClasses(ClassLoader loader) throws IOException
{
if(topLevelClasses == null)
{
topLevelClasses = ClassPath.from(loader).getTopLevelClasses();
}
return (topLevelClasses);
}
/*******************************************************************************
**
*******************************************************************************/
public static void clearTopLevelClassCache()
{
topLevelClasses = null;
}
}