/*

  * 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.giraph.block_app.framework.internal;

 import java.lang.reflect.Field;

 import org.apache.giraph.block_app.framework.api.Counter;

 import org.apache.giraph.block_app.framework.api.StatusReporter;

 import org.apache.giraph.block_app.framework.internal.BlockMasterLogic.TimeStatsPerEvent;

 import org.apache.giraph.counters.CustomCounter;

 import org.apache.giraph.counters.CustomCounters;

 import org.apache.hadoop.mapreduce.Mapper;

 /** Utility class for Blocks Framework related counters */

 public class BlockCounters {

   public static final String GROUP = "Blocks Framework";

   private BlockCounters() { }

   /**

    * Takes all fields from stage object, and puts them into counters,

    * if possible.

    * Only fields that are convertible to long via widening are set

    * (i.e. long/int/short/byte)

    */

   public static void setStageCounters(

       String prefix, Object stage, StatusReporter reporter) {

     if (stage != null && reporter != null) {

       Class<?> clazz = stage.getClass();

       while (clazz != null) {

         Field[] fields = clazz.getDeclaredFields();

         Field.setAccessible(fields, true);

         for (Field field : fields) {

           try {

             long value = field.getLong(stage);

             String counterName = prefix + field.getName();

             CustomCounters.addCustomCounter(GROUP, counterName,

                     CustomCounter.Aggregation.SUM);

             reporter.getCounter(

                 GROUP, prefix + field.getName()).setValue(value);

           // CHECKSTYLE: stop EmptyBlock - ignore any exceptions

           } catch (IllegalArgumentException | IllegalAccessException e) {

           }

           // CHECKSTYLE: resume EmptyBlock

         }

         clazz = clazz.getSuperclass();

       }

     }

   }

   public static void setMasterTimeCounter(

       PairedPieceAndStage<?> masterPiece, long superstep,

       long millis, StatusReporter reporter,

       TimeStatsPerEvent timeStats) {

     String name = masterPiece.getPiece().toString();

     String groupName = GROUP + " Master Timers";

     String counterName = String.format(

             "In %6.1f %s (s)", superstep - 0.5, name);

     CustomCounters.addCustomCounter(groupName, counterName,

             CustomCounter.Aggregation.SUM);

     reporter.getCounter(groupName, counterName).setValue(millis / 1000);

     timeStats.inc(name, millis);

   }

   public static void setWorkerTimeCounter(

       BlockWorkerPieces<?> workerPieces, long superstep,

       long millis, StatusReporter reporter,

       TimeStatsPerEvent timeStats) {

     String name = workerPieces.toStringShort();

     String groupName = GROUP + " Worker Timers";

     String counterName = String.format("In %6d %s (s)", superstep, name);

     CustomCounters.addCustomCounter(groupName, counterName,

             CustomCounter.Aggregation.SUM);

     reporter.getCounter(groupName, counterName).setValue(millis / 1000);

     timeStats.inc(name, millis);

   }

   public static Counter getCounter(

       Mapper.Context context, String group, String name) {

     final org.apache.hadoop.mapreduce.Counter counter =

         context.getCounter(group, name);

     return new Counter() {

       @Override

       public void increment(long incr) {

         counter.increment(incr);

       }

       @Override

       public void setValue(long value) {

         counter.setValue(value);

       }

     };

   }

   public static Counter getNoOpCounter() {

     return new Counter() {

       @Override

       public void setValue(long value) { }

       @Override

       public void increment(long incr) { }

     };

   }

 }