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From heytitle <...@git.apache.org>
Subject [GitHub] flink pull request #3511: [Flink-5734] code generation for normalizedkey sor...
Date Sun, 24 Sep 2017 18:35:18 GMT
Github user heytitle commented on a diff in the pull request:

    https://github.com/apache/flink/pull/3511#discussion_r140664033
  
    --- Diff: flink-runtime/src/main/java/org/apache/flink/runtime/codegeneration/SorterFactory.java
---
    @@ -0,0 +1,198 @@
    +/*
    + * 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.runtime.codegeneration;
    +
    +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.core.memory.MemorySegment;
    +import org.apache.flink.runtime.operators.sort.FixedLengthRecordSorter;
    +import org.apache.flink.runtime.operators.sort.InMemorySorter;
    +import org.apache.flink.runtime.operators.sort.NormalizedKeySorter;
    +
    +import freemarker.template.Configuration;
    +import freemarker.template.Template;
    +import freemarker.template.TemplateException;
    +import freemarker.template.TemplateExceptionHandler;
    +import freemarker.template.Version;
    +import org.codehaus.commons.compiler.CompileException;
    +import org.codehaus.janino.SimpleCompiler;
    +import org.slf4j.Logger;
    +import org.slf4j.LoggerFactory;
    +
    +import java.io.IOException;
    +import java.io.StringWriter;
    +import java.lang.reflect.Constructor;
    +import java.lang.reflect.InvocationTargetException;
    +import java.util.HashMap;
    +import java.util.List;
    +
    +/**
    + * {@link SorterFactory} is a singleton class that provides functionalities to create
the most suitable sorter
    + * for underlying data based on {@link TypeComparator}.
    + * Note: the generated code can be inspected by configuring Janino to write the code
that is being compiled
    + * to a file, see http://janino-compiler.github.io/janino/#debugging
    + */
    +public class SorterFactory {
    +	// ------------------------------------------------------------------------
    +	//                                   Constants
    +	// ------------------------------------------------------------------------
    +	private static final Logger LOG = LoggerFactory.getLogger(SorterFactory.class);
    +
    +	/** Fixed length records with a length below this threshold will be in-place sorted,
if possible. */
    +	private static final int THRESHOLD_FOR_IN_PLACE_SORTING = 32;
    +
    +	// ------------------------------------------------------------------------
    +	//                                   Singleton Attribute
    +	// ------------------------------------------------------------------------
    +	private static SorterFactory sorterFactory;
    +
    +	// ------------------------------------------------------------------------
    +	//                                   Attributes
    +	// ------------------------------------------------------------------------
    +	private SimpleCompiler classCompiler;
    +	private HashMap<String, Constructor> constructorCache;
    +	private final Template template;
    +
    +	/**
    +	 * This is only for testing. If an error occurs, we want to fail the test, instead of
falling back
    +	 * to a non-generated sorter.
    +	 */
    +	public boolean forceCodeGeneration = false;
    +
    +	/**
    +	 * Constructor.
    +	 */
    +	private SorterFactory() {
    +		this.classCompiler = new SimpleCompiler();
    +		this.classCompiler.setParentClassLoader(this.getClass().getClassLoader());
    --- End diff --
    
    Ok, I got it now. I thought there is some things behind this parent class loader field
and influence the existence of `classComplier`.


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