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SQL Parser and Optimizer
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/*
 * 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 com.hazelcast.org.apache.calcite.util.trace;

import com.hazelcast.org.apache.calcite.linq4j.function.Function2;
import com.hazelcast.org.apache.calcite.linq4j.function.Functions;
import com.hazelcast.org.apache.calcite.plan.AbstractRelOptPlanner;
import com.hazelcast.org.apache.calcite.plan.RelImplementor;
import com.hazelcast.org.apache.calcite.plan.RelOptPlanner;
import com.hazelcast.org.apache.calcite.prepare.Prepare;

import com.hazelcast.org.checkerframework.checker.nullness.qual.Nullable;
import com.hazelcast.org.slf4j.Logger;
import com.hazelcast.org.slf4j.LoggerFactory;

import java.io.File;

/**
 * Contains all of the {@link com.hazelcast.org.slf4j.Logger tracers} used within
 * com.hazelcast.org.apache.calcite class libraries.
 *
 * Note to developers
 *
 * Please ensure that every tracer used in com.hazelcast.org.apache.calcite is added to
 * this class as a public static final member called 
 * componentTracer. For example, {@link #getPlannerTracer} is the
 * tracer used by all classes which take part in the query planning process.
 *
 * 
The javadoc in this file is the primary source of information on what
 * tracers are available, so the javadoc against each tracer member must be an
 * up-to-date description of what that tracer does.
 *
 * 
In the class where the tracer is used, create a private (or
 * perhaps protected) static final member called 
 * tracer.
 */
public abstract class CalciteTrace {
  //~ Static fields/initializers ---------------------------------------------

  /**
   * The "com.hazelcast.org.apache.calcite.sql.parser" tracer reports parser events in
   * {@link com.hazelcast.org.apache.calcite.sql.parser.SqlParser} and other classes at DEBUG.
   */
  public static final Logger PARSER_LOGGER = getParserTracer();

  private static final ThreadLocal<@Nullable Function2> DYNAMIC_HANDLER =
      ThreadLocal.withInitial(Functions::ignore2);

  //~ Methods ----------------------------------------------------------------

  /**
   * The "com.hazelcast.org.apache.calcite.plan.RelOptPlanner" tracer prints the query
   * optimization process.
   *
   * 
Levels:
   *
   * 

   * {@link Logger#debug(String)} (formerly FINE) prints rules as they fire;
   * 
{@link Logger#trace(String)} (formerly FINER) prints and validates the whole expression
   * pool and rule queue as each rule fires;
   * 
{@link Logger#trace(String)} (formerly FINEST) also prints finer details like rule
   * importances.
   * 
   */
  public static Logger getPlannerTracer() {
    return LoggerFactory.getLogger(RelOptPlanner.class.getName());
  }

  /**
   * Reports volcano planner optimization task events.
   */
  public static Logger getPlannerTaskTracer() {
    return LoggerFactory.getLogger("com.hazelcast.org.apache.calcite.plan.volcano.task");
  }

  /**
   * The "com.hazelcast.org.apache.calcite.prepare.Prepare" tracer prints the generated
   * program at DEBUG (formerly, FINE)  or higher.
   */
  public static Logger getStatementTracer() {
    return LoggerFactory.getLogger(Prepare.class.getName());
  }

  /**
   * The "com.hazelcast.org.apache.calcite.rel.RelImplementorImpl" tracer reports when
   * expressions are bound to variables (DEBUG, formerly FINE)
   */
  public static Logger getRelImplementorTracer() {
    return LoggerFactory.getLogger(RelImplementor.class);
  }

  /**
   * The tracer "com.hazelcast.org.apache.calcite.sql.timing" traces timing for
   * various stages of query processing.
   *
   * @see CalciteTimingTracer
   */
  public static Logger getSqlTimingTracer() {
    return LoggerFactory.getLogger("com.hazelcast.org.apache.calcite.sql.timing");
  }

  /**
   * The "com.hazelcast.org.apache.calcite.sql.parser" tracer reports parse events.
   */
  public static Logger getParserTracer() {
    return LoggerFactory.getLogger("com.hazelcast.org.apache.calcite.sql.parser");
  }

  /**
   * The "com.hazelcast.org.apache.calcite.sql2rel" tracer reports parse events.
   */
  public static Logger getSqlToRelTracer() {
    return LoggerFactory.getLogger("com.hazelcast.org.apache.calcite.sql2rel");
  }

  public static Logger getRuleAttemptsTracer() {
    return LoggerFactory.getLogger(
        AbstractRelOptPlanner.class.getName() + ".rule_execution_summary"
    );
  }

  /**
   * The tracers report important/useful information related with the execution
   * of unit tests.
   */
  public static Logger getTestTracer(Class testClass) {
    return LoggerFactory.getLogger(testClass.getName());
  }

  /**
   * Thread-local handler that is called with dynamically generated Java code.
   * It exists for unit-testing.
   * The handler is never null; the default handler does nothing.
   */
  public static ThreadLocal<@Nullable Function2> getDynamicHandler() {
    return DYNAMIC_HANDLER;
  }
}