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From ggevay <...@git.apache.org>
Subject [GitHub] flink pull request #2211: [WIP][FLINK-3599] Code generation for PojoSerializ...
Date Wed, 14 Sep 2016 15:41:34 GMT
Github user ggevay commented on a diff in the pull request:

    https://github.com/apache/flink/pull/2211#discussion_r78775276
  
    --- Diff: flink-core/src/main/resources/PojoSerializerTemplate.ftl ---
    @@ -0,0 +1,445 @@
    +/*
    + * 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 ${packageName};
    +import java.io.IOException;
    +import java.io.ObjectInputStream;
    +import java.io.ObjectOutputStream;
    +import java.lang.reflect.Modifier;
    +import java.util.ArrayList;
    +import java.util.Arrays;
    +import java.util.HashMap;
    +import java.util.LinkedHashMap;
    +import java.util.LinkedHashSet;
    +import java.util.List;
    +import java.util.Map;
    +import java.util.Objects;
    +import org.apache.flink.api.common.ExecutionConfig;
    +import org.apache.flink.api.common.typeinfo.TypeInformation;
    +import org.apache.flink.api.common.typeutils.TypeSerializer;
    +import org.apache.flink.api.java.typeutils.TypeExtractor;
    +import org.apache.flink.core.memory.DataInputView;
    +import org.apache.flink.core.memory.DataOutputView;
    +
    +public final class ${className} extends TypeSerializer {
    +	private static byte IS_NULL = 1;
    +	private static byte NO_SUBCLASS = 2;
    +	private static byte IS_SUBCLASS = 4;
    +	private static byte IS_TAGGED_SUBCLASS = 8;
    +	private int numFields;
    +	private ExecutionConfig executionConfig;
    +	private Map<Class, TypeSerializer> subclassSerializerCache;
    +	private final Map<Class, Integer> registeredClasses;
    +	private final TypeSerializer[] registeredSerializers;
    +	Class clazz;
    +	<#list members as m>
    +	${m}
    +	</#list>
    +
    +	public ${className}(Class clazz, TypeSerializer[] serializerFields, ExecutionConfig
e) {
    +		this.clazz = clazz;
    +		executionConfig = e;
    +		this.numFields = serializerFields.length;
    +		LinkedHashSet<Class> registeredPojoTypes = executionConfig.getRegisteredPojoTypes();
    +		subclassSerializerCache = new HashMap<Class, TypeSerializer>();
    +		List<Class> cleanedTaggedClasses = new ArrayList<Class>(registeredPojoTypes.size());
    +		for (Class registeredClass: registeredPojoTypes) {
    +			if (registeredClass.equals(clazz)) {
    +				continue;
    +			}
    +			if (!clazz.isAssignableFrom(registeredClass)) {
    +				continue;
    +			}
    +			cleanedTaggedClasses.add(registeredClass);
    +		}
    +		this.registeredClasses = new LinkedHashMap<Class, Integer>(cleanedTaggedClasses.size());
    +		registeredSerializers = new TypeSerializer[cleanedTaggedClasses.size()];
    +		int id = 0;
    +		for (Class registeredClass: cleanedTaggedClasses) {
    +			this.registeredClasses.put(registeredClass, id);
    +			TypeInformation typeInfo = TypeExtractor.createTypeInfo(registeredClass);
    +			registeredSerializers[id] = typeInfo.createSerializer(executionConfig);
    +			id++;
    +		}
    +		<#list initMembers as m>
    +		${m}
    +		</#list>
    +	}
    +
    +	private TypeSerializer getSubclassSerializer(Class subclass) {
    +		TypeSerializer result = (TypeSerializer)subclassSerializerCache.get(subclass);
    +		if (result == null) {
    +			TypeInformation typeInfo = TypeExtractor.createTypeInfo(subclass);
    +			result = typeInfo.createSerializer(executionConfig);
    +			subclassSerializerCache.put(subclass, result);
    +		}
    +		return result;
    +	}
    +
    +	@Override
    +	public boolean isImmutableType() { return false; }
    +
    +	@Override
    +	public ${className} duplicate() {
    +		boolean stateful = false;
    +		TypeSerializer[] duplicateFieldSerializers = new TypeSerializer[numFields];
    +		<#list duplicateSerializers as ds>
    +		${ds}
    +		</#list>
    +		if (stateful) {
    +			return new ${className}(clazz, duplicateFieldSerializers, executionConfig);
    +		} else {
    +			return this;
    +		}
    +	}
    +
    +	@Override
    +	public ${typeName} createInstance() {
    +		<#if alwaysNull == "true">
    +		return null;
    +		</#if>
    +		<#if alwaysNull != "true">
    +		${typeName} t = new ${typeName}();
    +		initializeFields(t);
    +		return t;
    +		</#if>
    +	}
    +
    +	protected void initializeFields(${typeName} t) {
    +		<#list createFields as cf>
    +		${cf}
    +		</#list>
    +	}
    +
    +	@Override
    +	public int getLength() {  return -1; } // TODO: make it smarter based on annotations?
    +
    +	<#if isFinal == "true">
    +	@Override
    +	public ${typeName} copy(Object from) {
    +		if (from == null) return null;
    +		<#if alwaysNull == "true">
    +		${typeName} target = null;
    +		</#if>
    +		<#if alwaysNull != "true">
    +		${typeName} target = new ${typeName}();
    --- End diff --
    
    Use `createInstance` here, because of `alwaysNull`


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