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 19 package org.apache.hadoop.hbase.replication; 20 21 import org.apache.hadoop.hbase.classification.InterfaceAudience; 22 import org.apache.hadoop.hbase.HBaseInterfaceAudience; 23 import org.apache.hadoop.hbase.wal.WAL.Entry; 24 25 /** 26 * A Filter for WAL entries before being sent over to replication. Multiple 27 * filters might be chained together using {@link ChainWALEntryFilter}. 28 */ 29 @InterfaceAudience.LimitedPrivate(HBaseInterfaceAudience.REPLICATION) 30 public interface WALEntryFilter { 31 32 /** 33 * Applies the filter, possibly returning a different Entry instance. 34 * If null is returned, the entry will be skipped. 35 * @param entry Entry to filter 36 * @return a (possibly modified) Entry to use. Returning null or an entry with 37 * no cells will cause the entry to be skipped for replication. 38 */ 39 public Entry filter(Entry entry); 40 41 }