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From: laurentgo <git@git.apache.org>
To: dev@drill.apache.org
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References: <git-pr-466-drill@git.apache.org>
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Subject: [GitHub] drill pull request: DRILL-4576: Add PlannerCallback
 interface for ...
Content-Type: text/plain
Message-Id: <20160406181342.6E83BDFC6E@git1-us-west.apache.org>
Date: Wed,  6 Apr 2016 18:13:42 +0000 (UTC)

Github user laurentgo commented on a diff in the pull request:

    https://github.com/apache/drill/pull/466#discussion_r58754467
  
    --- Diff: exec/java-exec/src/main/java/org/apache/drill/exec/planner/PlannerCallback.java ---
    @@ -0,0 +1,59 @@
    +/*
    + * 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.planner;
    +
    +import java.util.Collection;
    +
    +import org.apache.calcite.plan.RelOptPlanner;
    +
    +/**
    + * A callback that StoragePlugins can initialize to allow further configuration
    + * of the Planner at initialization time. Examples could be to allow adding lattices,
    + * materializations or additional traits to the planner that will be used in
    + * planning.
    + */
    +public abstract class PlannerCallback {
    +
    +  /**
    +   * Method that will be called before a planner is used to further configure the planner.
    +   * @param planner The planner to be configured.
    +   */
    +  public abstract void initializePlanner(RelOptPlanner planner);
    +
    +
    +  public static PlannerCallback merge(Collection<PlannerCallback> callbacks){
    +    return new PlannerCallbackCollection(callbacks);
    +  }
    +
    +  private static class PlannerCallbackCollection extends PlannerCallback{
    +    private Collection<PlannerCallback> callbacks;
    +
    +    private PlannerCallbackCollection(Collection<PlannerCallback> callbacks){
    +      this.callbacks = callbacks;
    --- End diff --
    
    should a immutable copy be used instead of the caller's collection?


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