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From gvramana <...@git.apache.org>
Subject [GitHub] carbondata pull request #1416: [WIP] [CARBONDATA-1592] Adding event listener...
Date Wed, 18 Oct 2017 14:05:14 GMT
Github user gvramana commented on a diff in the pull request:

    https://github.com/apache/carbondata/pull/1416#discussion_r145424680
  
    --- Diff: integration/spark2/src/main/scala/org/apache/carbondata/events/EventListenerExample.scala
---
    @@ -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.carbondata.events
    +
    +import java.io.File
    +
    +import org.apache.spark.sql.SparkSession
    +
    +import org.apache.carbondata.core.metadata.CarbonTableIdentifier
    +import org.apache.carbondata.processing.loading.model.CarbonLoadModel
    +
    +/**
    + * Example for event listener
    + */
    +object EventListenerExample extends App {
    +
    +  ListenerBus.getInstance()
    +    .addListener(LoadTablePreExecutionEvent.getClass.getName, new EventListener {
    +
    +      override def onEvent(event: Event): Unit = {
    +        println("Test event listener event")
    +      }
    +    })
    +
    +  import org.apache.spark.sql.CarbonSession._
    +
    +  val rootPath = new File(this.getClass.getResource("/").getPath
    +                          + "../../../..").getCanonicalPath
    +  val storeLocation = s"$rootPath/examples/spark2/target/store"
    +  val warehouse = s"$rootPath/examples/spark2/target/warehouse"
    +  val sparkSession = SparkSession
    +    .builder()
    +    .master("local")
    +    .appName("CarbonSessionExample")
    +    .config("spark.sql.warehouse.dir", warehouse)
    +    .config("spark.driver.host", "localhost")
    +    .getOrCreateCarbonSession(storeLocation)
    +  val carbonTableIdentifier = new CarbonTableIdentifier("db1", "tbl1", "tbl1-id")
    +  val carbonLoadModel = new CarbonLoadModel
    --- End diff --
    
    Example to be used how to subscribe to data load event


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