001/**
002 * Licensed to the Apache Software Foundation (ASF) under one
003 * or more contributor license agreements.  See the NOTICE file
004 * distributed with this work for additional information
005 * regarding copyright ownership.  The ASF licenses this file
006 * to you under the Apache License, Version 2.0 (the
007 * "License"); you may not use this file except in compliance
008 * with the License.  You may obtain a copy of the License at
009 * <p>
010 * http://www.apache.org/licenses/LICENSE-2.0
011 * <p>
012 * Unless required by applicable law or agreed to in writing, software
013 * distributed under the License is distributed on an "AS IS" BASIS,
014 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
015 * See the License for the specific language governing permissions and
016 * limitations under the License.
017 */
018package org.apache.hadoop.hbase.replication;
019
020import java.util.List;
021import org.apache.hadoop.hbase.HBaseInterfaceAudience;
022import org.apache.hadoop.hbase.wal.WAL;
023import org.apache.yetus.audience.InterfaceAudience;
024
025/**
026 * A {@link ChainWALEntryFilter} for providing more flexible options
027 */
028@InterfaceAudience.LimitedPrivate(HBaseInterfaceAudience.REPLICATION)
029public class ChainWALEmptyEntryFilter extends ChainWALEntryFilter {
030
031  private boolean filterEmptyEntry = false;
032
033  public ChainWALEmptyEntryFilter(final WALEntryFilter... filters) {
034    super(filters);
035  }
036
037  public ChainWALEmptyEntryFilter(final List<WALEntryFilter> filters) {
038    super(filters);
039  }
040
041  @Override
042  public WAL.Entry filter(WAL.Entry entry) {
043    entry = super.filter(entry);
044    if (filterEmptyEntry && entry != null && entry.getEdit().isEmpty()) {
045      return null;
046    }
047    return entry;
048  }
049
050  /**
051   * To allow the empty entries to get filtered, we want to set this optional flag to decide
052   * if we want to filter the entries which have no cells or all cells got filtered
053   * though {@link WALCellFilter}.
054   *
055   * @param filterEmptyEntry flag
056   */
057  @InterfaceAudience.Private
058  public void setFilterEmptyEntry(final boolean filterEmptyEntry) {
059    this.filterEmptyEntry = filterEmptyEntry;
060  }
061}