content: /*
   * 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 accord.impl.list;
  
  import java.util.Arrays;
  import java.util.TreeMap;
  import java.util.function.Function;
  import java.util.stream.Collectors;
  
  import com.google.common.collect.Sets;
  
  import accord.primitives.*;
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  import accord.api.Key;
  import accord.api.Write;
  import accord.local.CommandStore;
  import accord.local.SafeCommandStore;
  import accord.utils.async.AsyncChain;
  import accord.utils.async.AsyncChains;
  import accord.api.AsyncExecutor;
  
  public class ListWrite extends TreeMap<Key, int[]> implements Write.InMemoryWrite
  {
      private static final Logger logger = LoggerFactory.getLogger(ListWrite.class);
  
      private final Function<? super CommandStore, AsyncExecutor> executor;
  
      public ListWrite(Function<? super CommandStore, AsyncExecutor> executor)
      {
          this.executor = executor;
      }
  
      @Override
      public AsyncChain<Void> apply(SafeCommandStore safeStore, Seekable key, TxnId txnId, Timestamp executeAt, PartialTxn txn)
      {
          return applyDirect(safeStore.commandStore(), key, txnId, executeAt, txn);
      }
  
      @Override
      public AsyncChain<Void> applyDirect(CommandStore unsafeStore, Seekable key, TxnId txnId, Timestamp executeAt, PartialTxn txn)
      {
          ListStore dataStore = (ListStore) unsafeStore.unsafeGetDataStore();
          logger.trace("submitting WRITE on {} at {} key:{}", dataStore.node, executeAt, key);
          return executor.apply(unsafeStore).chain(() -> {
              applySync(unsafeStore, key, txnId, executeAt, txn);
              return null;
          });
      }
  
      @Override
      public AsyncChain<Void> applySync(CommandStore unsafeStore, Seekable key, TxnId txnId, Timestamp executeAt, PartialTxn txn)
      {
          ListStore dataStore = (ListStore) unsafeStore.unsafeGetDataStore();
          int[] data = get(key);
          dataStore.write((Key)key, executeAt, data);
          logger.trace("WRITE on {} at {} key:{} -> {}", dataStore.node, executeAt, key, data);
          return AsyncChains.success(null);
      }
  
      @Override
      public boolean equals(Object o)
      {
          if (o == this) return true;
          if (!(o instanceof ListWrite)) return false;
          ListWrite other = (ListWrite) o;
          // Can not rely on Map.equals as our value is an array: (new int[] {2}).equals(new int[] {2}) == false!
          if (!Sets.difference(keySet(), other.keySet()).isEmpty()
              || !Sets.difference(other.keySet(), keySet()).isEmpty())
              return false;
          // keys match
          for (Key k : keySet())
          {
              if (!Arrays.equals(get(k), other.get(k)))
                  return false;
          }
          return true;
      }
  
      @Override
      public int hashCode()
      {
          throw new UnsupportedOperationException();
      }
  
      @Override
      public String toString()
      {
          return entrySet().stream()
                           .map(e -> e.getKey() + ":" + Arrays.toString(e.getValue()))
                           .collect(Collectors.joining(", ", "{", "}"));
      }
  }
  