[jOOQ/jOOQ#16246] Add a new internal AbstractLazyScope base

implementation for Scopes that lazily initialise their DataMap

jOOQ/src/main/java/org/jooq/impl/AbstractLazyScope.java

@@ -0,0 +1,133 @@
+/*
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *  https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ * Other licenses:
+ * -----------------------------------------------------------------------------
+ * Commercial licenses for this work are available. These replace the above
+ * ASL 2.0 and offer limited warranties, support, maintenance, and commercial
+ * database integrations.
+ *
+ * For more information, please visit: https://www.jooq.org/legal/licensing
+ *
+ *
+ *
+ *
+ *
+ *
+ *
+ *
+ *
+ *
+ *
+ *
+ *
+ *
+ *
+ *
+ */
+package org.jooq.impl;
+
+import java.time.Instant;
+import java.util.Map;
+
+import org.jooq.CacheContext;
+import org.jooq.Configuration;
+import org.jooq.ConverterContext;
+import org.jooq.DSLContext;
+import org.jooq.GeneratorContext;
+import org.jooq.SQLDialect;
+import org.jooq.Scope;
+import org.jooq.conf.Settings;
+
+/**
+ * Unlike {@link AbstractScope}, this implementation lazy initialises its
+ * {@link #data()} map in order to avoid allocation in very short lived
+ * {@link Scope} implementations, such as e.g. {@link CacheContext},
+ * {@link ConverterContext}, {@link GeneratorContext}.
+ *
+ * @author Lukas Eder
+ */
+abstract class AbstractLazyScope implements Scope {
+
+    private final Configuration configuration;
+    private Map<Object, Object> data;
+    private final Instant       creationTime;
+
+    AbstractLazyScope(Configuration configuration) {
+        this(configuration, null);
+    }
+
+    AbstractLazyScope(Configuration configuration, Map<Object, Object> data) {
+
+        // The Configuration can be null when unattached objects are
+        // executed or when unattached Records are stored...
+        if (configuration == null)
+            configuration = new DefaultConfiguration();
+
+        this.configuration = configuration;
+        this.data = data;
+        this.creationTime = configuration.clock().instant();
+    }
+
+    // ------------------------------------------------------------------------
+    // XXX Scope API
+    // ------------------------------------------------------------------------
+
+    @Override
+    public final Instant creationTime() {
+        return creationTime;
+    }
+
+    @Override
+    public final Configuration configuration() {
+        return configuration;
+    }
+
+    @Override
+    public final DSLContext dsl() {
+        return configuration.dsl();
+    }
+
+    @Override
+    public final Settings settings() {
+        return configuration.settings();
+    }
+
+    @Override
+    public final SQLDialect dialect() {
+        return configuration.dialect();
+    }
+
+    @Override
+    public final SQLDialect family() {
+        return configuration.family();
+    }
+
+    @Override
+    public final Map<Object, Object> data() {
+        if (data == null)
+            data = new DataMap();
+
+        return data;
+    }
+
+    @Override
+    public final Object data(Object key) {
+        return data().get(key);
+    }
+
+    @Override
+    public final Object data(Object key, Object value) {
+        return data().put(key, value);
+    }
+}

jOOQ/src/main/java/org/jooq/impl/AbstractNode.java

@@ -50,7 +50,7 @@ import org.jooq.exception.DataDefinitionException;
 /**
  * @author Lukas Eder
  */
-abstract class AbstractNode<N extends Node<N>> extends AbstractScope implements Node<N> {
+abstract class AbstractNode<N extends Node<N>> extends AbstractLazyScope implements Node<N> {
 
     final N      root;
     final String id;

jOOQ/src/main/java/org/jooq/impl/DefaultCacheContext.java

@@ -43,7 +43,7 @@ import org.jooq.Configuration;
 /**
  * @author Lukas Eder
  */
-final class DefaultCacheContext extends AbstractScope implements CacheContext {
+final class DefaultCacheContext extends AbstractLazyScope implements CacheContext {
 
     private final CacheType cacheType;
 

jOOQ/src/main/java/org/jooq/impl/DefaultConverterContext.java

@@ -45,7 +45,7 @@ import org.jooq.ConverterContext;
 /**
  * @author Lukas Eder
  */
-final class DefaultConverterContext extends AbstractScope implements ConverterContext {
+final class DefaultConverterContext extends AbstractLazyScope implements ConverterContext {
 
     DefaultConverterContext(Configuration configuration) {
         super(configuration, new DataMap());

jOOQ/src/main/java/org/jooq/impl/DefaultGeneratorContext.java

@@ -50,7 +50,7 @@ import org.jooq.Table;
 /**
  * @author Lukas Eder
  */
-final class DefaultGeneratorContext<R extends Record, X extends Table<R>, T> extends AbstractScope implements GeneratorContext<R, X, T> {
+final class DefaultGeneratorContext<R extends Record, X extends Table<R>, T> extends AbstractLazyScope implements GeneratorContext<R, X, T> {
 
     final Instant                renderTime;
     final X                      table;