Performance - cache the path maps used for load context

- Cache the path maps
- Include the ToOne paths
- Use empty map for null prefix

ebean-core/src/main/java/io/ebeaninternal/server/deploy/BeanDescriptor.java

@@ -86,6 +86,8 @@ public class BeanDescriptor<T> implements BeanType<T>, STreeType, SpiBeanType {
   private final ConcurrentHashMap<String, ElPropertyDeploy> elDeployCache = new ConcurrentHashMap<>();
   private final ConcurrentHashMap<String, ElComparator<T>> comparatorCache = new ConcurrentHashMap<>();
   private final ConcurrentHashMap<String, STreeProperty> dynamicProperty = new ConcurrentHashMap<>();
+  private final ConcurrentHashMap<String, Map<String,String>> pathMaps = new ConcurrentHashMap<>();
+
   private final Map<String, SpiRawSql> namedRawSql;
   private final Map<String, String> namedQuery;
   private final boolean multiValueSupported;
@@ -2775,6 +2777,22 @@ public class BeanDescriptor<T> implements BeanType<T>, STreeType, SpiBeanType {
     return draftableElement;
   }
 
+  @Override
+  public Map<String, String> pathMap(String prefix) {
+    return pathMaps.computeIfAbsent(prefix, s -> {
+      HashMap<String, String> m = new HashMap<>();
+      for (STreePropertyAssocMany many : propsMany()) {
+        String name = many.name();
+        m.put(name, prefix + "." + name);
+      }
+      for (STreePropertyAssocOne one : propsOne()) {
+        String name = one.name();
+        m.put(name, prefix + "." + name);
+      }
+      return m.isEmpty() ? Collections.emptyMap() : m;
+    });
+  }
+
   @Override
   public boolean isEmbeddedPath(String propertyPath) {
     ElPropertyDeploy elProp = elPropertyDeploy(propertyPath);

ebean-core/src/main/java/io/ebeaninternal/server/query/CQuery.java

@@ -581,19 +581,19 @@ public final class CQuery<T> implements DbReadContext, CancelableQuery, SpiProfi
 
   @Override
   public void registerBeanInherit(BeanPropertyAssocOne<?> property, EntityBeanIntercept ebi) {
-    String path = getPath(property.name());
+    String path = path(property.name());
     request.loadContext().register(path, ebi, property);
   }
 
   @Override
   public void register(String path, EntityBeanIntercept ebi) {
-    path = getPath(path);
+    path = path(path);
     request.loadContext().register(path, ebi);
   }
 
   @Override
   public void register(BeanPropertyAssocMany<?> many, BeanCollection<?> bc) {
-    String path = getPath(many.name());
+    String path = path(many.name());
     request.loadContext().register(path, many, bc);
   }
 
@@ -663,18 +663,14 @@ public final class CQuery<T> implements DbReadContext, CancelableQuery, SpiProfi
     return autoTuneProfiling && query.isUsageProfiling();
   }
 
-  private String getPath(String propertyName) {
+  private String path(String propertyName) {
     if (currentPrefix == null) {
       return propertyName;
     } else if (propertyName == null) {
       return currentPrefix;
     }
     String path = currentPathMap.get(propertyName);
-    if (path != null) {
-      return path;
-    } else {
-      return currentPrefix + "." + propertyName;
-    }
+    return path != null ? path : currentPrefix + "." + propertyName;
   }
 
   @Override

ebean-core/src/main/java/io/ebeaninternal/server/query/STreeType.java

@@ -7,6 +7,8 @@ import io.ebeaninternal.server.deploy.DbReadContext;
 import io.ebeaninternal.server.deploy.InheritInfo;
 import io.ebeaninternal.server.deploy.id.IdBinder;
 
+import java.util.Map;
+
 /**
  * Bean type interface for Sql query tree.
  */
@@ -136,4 +138,8 @@ public interface STreeType {
    */
   void markAsDeleted(EntityBean bean);
 
+  /**
+   * Return the "path map" to toMany or toOne properties using the given prefix.
+   */
+  Map<String, String> pathMap(String prefix);
 }

ebean-core/src/main/java/io/ebeaninternal/server/query/SqlTreeNodeBean.java

@@ -122,20 +122,11 @@ class SqlTreeNodeBean implements SqlTreeNode {
   }
 
   private Map<String, String> createPathMap(String prefix, STreeType desc) {
-    HashMap<String, String> m = new HashMap<>();
-    for (STreePropertyAssocMany many : desc.propsMany()) {
-      String name = many.name();
-      m.put(name, path(prefix, name));
-    }
-    return m;
+    return prefix == null ? Collections.emptyMap() : desc.pathMap(prefix);
   }
 
   private String path(String prefix, String propertyName) {
-    if (prefix == null) {
-      return propertyName;
-    } else {
-      return prefix + "." + propertyName;
-    }
+    return prefix == null ? propertyName : prefix + "." + propertyName;
   }
 
   @Override