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From arina-ielchiieva <...@git.apache.org>
Subject [GitHub] drill pull request #660: DRILL-5052: Option to debug generated Java code usi...
Date Thu, 08 Dec 2016 15:26:54 GMT
Github user arina-ielchiieva commented on a diff in the pull request:

    https://github.com/apache/drill/pull/660#discussion_r91509053
  
    --- Diff: exec/java-exec/src/main/java/org/apache/drill/exec/compile/ClassCompilerSelector.java
---
    @@ -0,0 +1,146 @@
    +/**
    + * 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.drill.exec.compile;
    +
    +import java.io.IOException;
    +import java.util.Arrays;
    +import java.util.Map;
    +
    +import org.apache.drill.common.config.DrillConfig;
    +import org.apache.drill.common.exceptions.UserException;
    +import org.apache.drill.exec.compile.ClassTransformer.ClassNames;
    +import org.apache.drill.exec.exception.ClassTransformationException;
    +import org.apache.drill.exec.server.options.OptionManager;
    +import org.apache.drill.exec.server.options.OptionValidator;
    +import org.apache.drill.exec.server.options.OptionValue;
    +import org.apache.drill.exec.server.options.TypeValidators.BooleanValidator;
    +import org.apache.drill.exec.server.options.TypeValidators.LongValidator;
    +import org.apache.drill.exec.server.options.TypeValidators.StringValidator;
    +import org.codehaus.commons.compiler.CompileException;
    +
    +/**
    + * Selects between the two supported Java compilers: Janino and
    + * the build-in Java compiler.
    + *
    + * <h4>Session Options</h4>
    + * <dl>
    + * <dt>exec.java_compiler</dt>
    + * <dd>The compiler to use. Valid options are defined in the
    + * {@link ClassCompilerSelector.CompilerPolicy} enum.</dd>
    + * <dt>exec.java_compiler_debug</dt>
    + * <dd>If debug logging is enabled, then {@link AbstractClassCompiler} writes the
    + * generated Java code to the log file prior to compilation. This option
    + * adds line numbers to the logged code.</dd>
    + * <dt>exec.java_compiler_janino_maxsize</dt>
    + * <dd>The maximum size of code that the Janio compiler can handle. Larger code
is
    + * handled by the JDK compiler. Defaults to 256K.</dd>
    + * </dl>
    + * <h4>Configuration Options</h4>
    + * Configuration options are used when the above session options are unset.
    + * <dl>
    + * <dt>drill.exec.compile.compiler</dt>
    + * <dd>Default for <var>exec.java_compiler</var></dd>
    + * <dt>drill.exec.compile.debug</dt>
    + * <dd>Default for <var>exec.java_compiler_debug</var></dd>
    + * <dt>drill.exec.compile.janino_maxsize</dt>
    + * <dd>Default for <var>exec.java_compiler_janino_maxsize</var></dd>
    + * </dl>
    + */
    +
    +public class ClassCompilerSelector {
    +  public enum CompilerPolicy {
    +    DEFAULT, JDK, JANINO;
    +  }
    +
    +  public static final String JAVA_COMPILER_JANINO_MAXSIZE_CONFIG = CodeCompiler.COMPILE_BASE
+ ".janino_maxsize";
    +  public static final String JAVA_COMPILER_DEBUG_CONFIG = CodeCompiler.COMPILE_BASE +
".debug";
    +  public static final String JAVA_COMPILER_CONFIG = CodeCompiler.COMPILE_BASE + ".compiler";
    +
    +  public static final String JAVA_COMPILER_OPTION = "exec.java_compiler";
    +  public static final String JAVA_COMPILER_JANINO_MAXSIZE_OPTION = "exec.java_compiler_janino_maxsize";
    +  public static final OptionValidator JAVA_COMPILER_JANINO_MAXSIZE = new LongValidator(JAVA_COMPILER_JANINO_MAXSIZE_OPTION,
256*1024);
    +
    +  public static final String JAVA_COMPILER_DEBUG_OPTION = "exec.java_compiler_debug";
    +  public static final OptionValidator JAVA_COMPILER_DEBUG = new BooleanValidator(JAVA_COMPILER_DEBUG_OPTION,
true);
    +
    +  public static final StringValidator JAVA_COMPILER_VALIDATOR = new StringValidator(JAVA_COMPILER_OPTION,
CompilerPolicy.DEFAULT.toString()) {
    +    @Override
    +    public void validate(final OptionValue v, final OptionManager manager) {
    +      super.validate(v, manager);
    +      try {
    +        CompilerPolicy.valueOf(v.string_val.toUpperCase());
    +      } catch (IllegalArgumentException e) {
    +        throw UserException.validationError()
    +            .message("Invalid value '%s' specified for option '%s'. Valid values are
%s.",
    +              v.string_val, getOptionName(), Arrays.toString(CompilerPolicy.values()))
    +            .build(QueryClassLoader.logger);
    +      }
    +    }
    +  };
    +
    +  private final CompilerPolicy policy;
    +  private final long janinoThreshold;
    +
    +  private final AbstractClassCompiler jdkClassCompiler;
    +  private final AbstractClassCompiler janinoClassCompiler;
    +
    +  public ClassCompilerSelector(ClassLoader classLoader, DrillConfig config, OptionManager
sessionOptions) {
    +    OptionValue value = sessionOptions.getOption(JAVA_COMPILER_OPTION);
    +    this.policy = CompilerPolicy.valueOf((value != null) ? value.string_val.toUpperCase()
: config.getString(JAVA_COMPILER_CONFIG).toUpperCase());
    +
    +    value = sessionOptions.getOption(JAVA_COMPILER_JANINO_MAXSIZE_OPTION);
    +    this.janinoThreshold = (value != null) ? value.num_val : config.getLong(JAVA_COMPILER_JANINO_MAXSIZE_CONFIG);
    +
    +    value = sessionOptions.getOption(JAVA_COMPILER_DEBUG_OPTION);
    +    boolean debug = (value != null) ? value.bool_val : config.getBoolean(JAVA_COMPILER_DEBUG_CONFIG);
    +
    +    this.janinoClassCompiler = (policy == CompilerPolicy.JANINO || policy == CompilerPolicy.DEFAULT)
? new JaninoClassCompiler(classLoader, debug) : null;
    +    this.jdkClassCompiler = (policy == CompilerPolicy.JDK || policy == CompilerPolicy.DEFAULT)
? JDKClassCompiler.newInstance(classLoader, debug) : null;
    +  }
    +
    +  byte[][] getClassByteCode(ClassNames className, String sourceCode)
    +      throws CompileException, ClassNotFoundException, ClassTransformationException,
IOException {
    +
    +    byte[][] bc = getCompiler( sourceCode ).getClassByteCode(className, sourceCode);
    +
    +    // Uncomment the following to save the generated byte codes.
    +    /*
    +     * final String baseDir = System.getProperty("java.io.tmpdir") + File.separator +
classCompiler.getClass().getSimpleName();
    --- End diff --
    
    1. May be it's better to add configuration parameter: drill.exec.save.generated.byte.code
to avoid uncommenting?
    2. Is this file being deleted to avoid storing to many temp files?


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