/*
 * 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.iotdb.db.schemaengine.schemaregion.mtree.impl.pbtree.mnode.container;

import org.apache.iotdb.db.schemaengine.schemaregion.mtree.impl.pbtree.mnode.ICachedMNode;

import javax.annotation.Nonnull;
import javax.annotation.Nullable;

import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;

public class MNodeUpdateChildBuffer extends MNodeChildBuffer {
  @Nullable
  @Override
  public synchronized ICachedMNode put(String key, ICachedMNode value) {
    if (receivingBuffer == null) {
      receivingBuffer = new ConcurrentHashMap<>();
    }
    if (flushingBuffer == null || !flushingBuffer.containsKey(key)) {
      totalSize++;
    }
    return receivingBuffer.put(key, value);
  }

  @Nullable
  @Override
  public synchronized ICachedMNode putIfAbsent(String key, ICachedMNode value) {
    ICachedMNode result = get(receivingBuffer, key);
    if (result == null) {
      if (receivingBuffer == null) {
        receivingBuffer = new ConcurrentHashMap<>();
      }
      if (flushingBuffer == null || !flushingBuffer.containsKey(key)) {
        totalSize++;
      }
      result = receivingBuffer.put(key, value);
    }
    return result;
  }

  @Override
  public synchronized void putAll(@Nonnull Map<? extends String, ? extends ICachedMNode> m) {
    if (receivingBuffer == null) {
      receivingBuffer = new ConcurrentHashMap<>();
    }
    for (Entry<? extends String, ? extends ICachedMNode> entry : m.entrySet()) {
      if (flushingBuffer == null || !flushingBuffer.containsKey(entry.getKey())) {
        totalSize++;
      }
      receivingBuffer.put(entry.getKey(), entry.getValue());
    }
  }

  @Override
  public synchronized ICachedMNode removeFromFlushingBuffer(Object key) {
    if (flushingBuffer == null) {
      return null;
    }
    ICachedMNode result = flushingBuffer.remove(key);
    if (result != null && (receivingBuffer == null || !receivingBuffer.containsKey(key))) {
      totalSize--;
    }
    return result;
  }
}
