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Server functionality for HBase

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/*
 * 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.hadoop.hbase.replication;

import org.apache.hadoop.hbase.wal.AbstractFSWALProvider;
import org.apache.yetus.audience.InterfaceAudience;

@InterfaceAudience.Private
public final class ReplicationOffsetUtil {

  private ReplicationOffsetUtil() {
  }

  public static boolean shouldReplicate(ReplicationGroupOffset offset, String wal) {
    // if no offset or the offset is just a place marker, replicate
    if (offset == null || offset == ReplicationGroupOffset.BEGIN) {
      return true;
    }
    // otherwise, compare the timestamp
    long walTs = AbstractFSWALProvider.getTimestamp(wal);
    long startWalTs = AbstractFSWALProvider.getTimestamp(offset.getWal());
    if (walTs < startWalTs) {
      return false;
    } else if (walTs > startWalTs) {
      return true;
    }
    // if the timestamp equals, usually it means we should include this wal but there is a special
    // case, a negative offset means the wal has already been fully replicated, so here we should
    // check the offset.
    return offset.getOffset() >= 0;
  }
}