| /* |
| * 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.calcite.adapter.spark; |
| |
| import org.apache.calcite.adapter.enumerable.EnumerableRules; |
| import org.apache.calcite.config.CalciteSystemProperty; |
| import org.apache.calcite.jdbc.CalcitePrepare; |
| import org.apache.calcite.linq4j.tree.ClassDeclaration; |
| import org.apache.calcite.plan.RelOptPlanner; |
| import org.apache.calcite.plan.RelOptRule; |
| import org.apache.calcite.rel.RelNode; |
| import org.apache.calcite.runtime.ArrayBindable; |
| import org.apache.calcite.util.Util; |
| import org.apache.calcite.util.javac.JaninoCompiler; |
| |
| import org.apache.spark.api.java.JavaSparkContext; |
| |
| import java.io.File; |
| import java.io.Serializable; |
| import java.lang.reflect.Constructor; |
| import java.lang.reflect.InvocationTargetException; |
| import java.util.Calendar; |
| import java.util.concurrent.atomic.AtomicInteger; |
| |
| /** |
| * Implementation of |
| * {@link org.apache.calcite.jdbc.CalcitePrepare.SparkHandler}. Gives the core |
| * Calcite engine access to rules that only exist in the Spark module. |
| */ |
| public class SparkHandlerImpl implements CalcitePrepare.SparkHandler { |
| private final HttpServer classServer; |
| private final AtomicInteger classId; |
| private final JavaSparkContext sparkContext = |
| new JavaSparkContext("local[1]", "calcite"); |
| |
| /** Thread-safe holder. */ |
| private static class Holder { |
| private static final SparkHandlerImpl INSTANCE = new SparkHandlerImpl(); |
| } |
| |
| private static final File CLASS_DIR = new File("build/sparkServer/classes"); |
| |
| /** Creates a SparkHandlerImpl. */ |
| private SparkHandlerImpl() { |
| if (!CLASS_DIR.isDirectory() && !CLASS_DIR.mkdirs()) { |
| System.err.println("Unable to create temporary folder " + CLASS_DIR); |
| } |
| classServer = new HttpServer(CLASS_DIR); |
| |
| // Start the classServer and store its URI in a spark system property |
| // (which will be passed to executors so that they can connect to it) |
| classServer.start(); |
| System.setProperty("spark.repl.class.uri", classServer.uri()); |
| |
| // Generate a starting point for class names that is unlikely to clash with |
| // previous classes. A better solution would be to clear the class directory |
| // on startup. |
| final Calendar calendar = Util.calendar(); |
| classId = new AtomicInteger( |
| calendar.get(Calendar.HOUR_OF_DAY) * 10000 |
| + calendar.get(Calendar.MINUTE) * 100 |
| + calendar.get(Calendar.SECOND)); |
| } |
| |
| /** Creates a SparkHandlerImpl, initializing on first call. Calcite-core calls |
| * this via reflection. */ |
| @SuppressWarnings("UnusedDeclaration") |
| public static CalcitePrepare.SparkHandler instance() { |
| return Holder.INSTANCE; |
| } |
| |
| public RelNode flattenTypes(RelOptPlanner planner, RelNode rootRel, |
| boolean restructure) { |
| RelNode root2 = |
| planner.changeTraits(rootRel, |
| rootRel.getTraitSet().plus(SparkRel.CONVENTION).simplify()); |
| return planner.changeTraits(root2, rootRel.getTraitSet().simplify()); |
| } |
| |
| public void registerRules(RuleSetBuilder builder) { |
| for (RelOptRule rule : SparkRules.rules()) { |
| builder.addRule(rule); |
| } |
| builder.removeRule(EnumerableRules.ENUMERABLE_VALUES_RULE); |
| } |
| |
| public Object sparkContext() { |
| return sparkContext; |
| } |
| |
| public boolean enabled() { |
| return true; |
| } |
| |
| public ArrayBindable compile(ClassDeclaration expr, String s) { |
| final String className = "CalciteProgram" + classId.getAndIncrement(); |
| final String classFileName = className + ".java"; |
| String source = "public class " + className + "\n" |
| + " implements " + ArrayBindable.class.getName() |
| + ", " + Serializable.class.getName() |
| + " {\n" |
| + s + "\n" |
| + "}\n"; |
| |
| if (CalciteSystemProperty.DEBUG.value()) { |
| Util.debugCode(System.out, source); |
| } |
| |
| JaninoCompiler compiler = new JaninoCompiler(); |
| compiler.getArgs().setDestdir(CLASS_DIR.getAbsolutePath()); |
| compiler.getArgs().setSource(source, classFileName); |
| compiler.getArgs().setFullClassName(className); |
| compiler.compile(); |
| try { |
| @SuppressWarnings("unchecked") |
| final Class<ArrayBindable> clazz = |
| (Class<ArrayBindable>) compiler.getClassLoader().loadClass(className); |
| final Constructor<ArrayBindable> constructor = clazz.getConstructor(); |
| return constructor.newInstance(); |
| } catch (ClassNotFoundException | InstantiationException |
| | IllegalAccessException | NoSuchMethodException |
| | InvocationTargetException e) { |
| throw new RuntimeException(e); |
| } |
| } |
| } |