content: /*
   * Copyright 2021 Alibaba Group Holding Limited.
   *
   * Licensed 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.alibaba.graphscope.parallel.message;
  
  import com.alibaba.graphscope.fragment.IFragment;
  
  import org.apache.giraph.conf.ImmutableClassesGiraphConfiguration;
  import org.apache.giraph.conf.MessageClasses;
  import org.apache.hadoop.io.Writable;
  import org.apache.hadoop.io.WritableComparable;
  
  /**
   * Factory for message stores
   *
   * @param <I>  Vertex id
   * @param <M>  Message data
   * @param <MS> Message store
   */
  public interface MessageStoreFactory<I extends WritableComparable, M extends Writable, MS> {
  
      /**
       * Creates new message store.
       *
       * @param messageClasses Message classes information to be held in the store
       * @return New message store
       */
      MS newStore(MessageClasses<I, M> messageClasses);
  
      /**
       * Implementation class should use this method of initialization of any required internal
       * state.
       *
       * @param fragment fragment used for partition querying
       * @param conf     Configuration
       */
      void initialize(IFragment fragment, ImmutableClassesGiraphConfiguration<I, ?, ?> conf);
  }
  