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From ggevay <...@git.apache.org>
Subject [GitHub] flink pull request #2211: [WIP][FLINK-3599] Code generation for PojoSerializ...
Date Thu, 08 Sep 2016 11:42:46 GMT
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


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