1 /* 2 * Licensed to the Apache Software Foundation (ASF) under one 3 * or more contributor license agreements. See the NOTICE file 4 * distributed with this work for additional information 5 * regarding copyright ownership. The ASF licenses this file 6 * to you under the Apache License, Version 2.0 (the 7 * "License"); you may not use this file except in compliance 8 * with the License. You may obtain a copy of the License at 9 * 10 * http://www.apache.org/licenses/LICENSE-2.0 11 * 12 * Unless required by applicable law or agreed to in writing, software 13 * distributed under the License is distributed on an "AS IS" BASIS, 14 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 15 * See the License for the specific language governing permissions and 16 * limitations under the License. 17 */ 18 package org.apache.giraph.block_app.framework.api; 19 20 import org.apache.giraph.aggregators.Aggregator; 21 import org.apache.giraph.block_app.framework.piece.global_comm.BroadcastHandle; 22 import org.apache.giraph.master.MasterAggregatorUsage; 23 import org.apache.giraph.master.MasterGlobalCommUsage; 24 import org.apache.hadoop.io.Writable; 25 26 /** 27 * Block computation API available for the master methods. 28 * 29 * Interface to the MasterCompute methods. 30 */ 31 public interface BlockMasterApi extends MasterAggregatorUsage, 32 MasterGlobalCommUsage, StatusReporter, BlockApi, BlockOutputApi { 33 /** 34 * No need to use it, and introduces global dependencies. 35 * 36 * Store data locally within the piece, or use ObjectHolder. 37 */ 38 @Deprecated 39 @Override 40 <A extends Writable> 41 boolean registerPersistentAggregator( 42 String name, Class<? extends Aggregator<A>> aggregatorClass 43 ) throws InstantiationException, IllegalAccessException; 44 45 /** 46 * Broadcast given value to all workers for next computation. 47 * @param value Value to broadcast 48 */ 49 <T extends Writable> BroadcastHandle<T> broadcast(T value); 50 51 /** 52 * Call this to log a line to command line of the job. Use in moderation - 53 * it's a synchronous call to Job client 54 * 55 * @param line Line to print 56 */ 57 void logToCommandLine(String line); 58 }