Github user ggevay commented on a diff in the pull request:
https://github.com/apache/flink/pull/2211#discussion_r77990262
--- Diff:
flink-core/src/main/java/org/apache/flink/api/java/typeutils/runtime/PojoComparatorGenerator.java
---
@@ -0,0 +1,207 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements. See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership. The ASF licenses this file
+ * to you 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
+ *
+ * http://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.
+ */
+
+package org.apache.flink.api.java.typeutils.runtime;
+
+import org.apache.flink.api.common.ExecutionConfig;
+import org.apache.flink.api.common.typeutils.TypeComparator;
+import org.apache.flink.api.common.typeutils.TypeSerializer;
+import org.apache.flink.util.InstantiationUtil;
+
+import java.io.IOException;
+import java.lang.reflect.Constructor;
+import java.lang.reflect.Field;
+import java.util.HashMap;
+import java.util.Map;
+
+import static
org.apache.flink.api.java.typeutils.PojoTypeInfo.accessStringForField;
+
+public final class PojoComparatorGenerator<T> {
+ private static final String packageName =
"org.apache.flink.api.java.typeutils.runtime.generated";
+
+ private transient Field[] keyFields;
+ private transient Integer[] keyFieldIds;
+ private final TypeComparator<Object>[] comparators;
+ private final TypeSerializer<T> serializer;
+ private final Class<T> type;
+ private final ExecutionConfig config;
+ private String code;
+
+ public PojoComparatorGenerator(Field[] keyFields, TypeComparator<?>[]
comparators, TypeSerializer<T> serializer,
+
Class<T> type, Integer[] keyFieldIds, ExecutionConfig config) {
+ this.keyFields = keyFields;
+ this.comparators = (TypeComparator<Object>[]) comparators;
+
+ this.type = type;
+ this.serializer = serializer;
+ this.keyFieldIds = keyFieldIds;
+ this.config = config;
+ }
+
+ public TypeComparator<T> createComparator() {
+ // Multiple comparators can be generated for each type based on
a list of keys. The list of keys and the type
+ // name should determine the generated comparator. This
information is used for caching (avoiding
+ // recompilation). Note that, the name of the field is not
sufficient because nested POJOs might have a field
+ // with the name.
+ StringBuilder keyBuilder = new StringBuilder();
+ for(Integer i : keyFieldIds) {
+ keyBuilder.append(i);
+ keyBuilder.append("_");
+ }
+ final String className = type.getCanonicalName().replace('.',
'_') + "_GeneratedComparator" +
+ keyBuilder.toString();
+ final String fullClassName = packageName + "." + className;
+ Class<?> comparatorClazz;
+ code = InstantiationUtil.getCodeForCachedClass(fullClassName);
+ if (code == null) {
+ generateCode(className);
+ }
+ if (config.isWrapGeneratedClassesEnabled()) {
+ return new GenTypeComparatorProxy<>(type,
fullClassName, code, comparators, serializer);
+ }
+ try {
+ comparatorClazz =
InstantiationUtil.compile(type.getClassLoader(), fullClassName, code);
+ } catch (Exception e) {
+ throw new RuntimeException("Unable to generate
comparator: " + className, e);
+ }
+ Constructor<?>[] ctors = comparatorClazz.getConstructors();
+ assert ctors.length == 1;
+ try {
+ return (TypeComparator<T>) ctors[0].newInstance(new
Object[]{comparators, serializer, type});
--- End diff --
varargs
---
If your project is set up for it, you can reply to this email and have your
reply appear on GitHub as well. If your project does not have this feature
enabled and wishes so, or if the feature is enabled but not working, please
contact infrastructure at infrastruct...@apache.org or file a JIRA ticket
with INFRA.
---
