/*
* Copyright 2010 The Apache Software Foundation
*
* 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.regionserver.wal;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.hbase.HRegionInfo;
/**
* Get notification of {@link HLog}/WAL log events. The invocations are inline
* so make sure your implementation is fast else you'll slow hbase.
*/
public interface WALObserver {
/**
* The WAL was rolled.
* @param newFile the path to the new hlog
*/
public void logRolled(Path newFile);
/**
* A request was made that the WAL be rolled.
*/
public void logRollRequested();
/**
* The WAL is about to close.
*/
public void logCloseRequested();
/**
* Called before each write.
* @param info
* @param logKey
* @param logEdit
*/
public void visitLogEntryBeforeWrite(HRegionInfo info, HLogKey logKey,
WALEdit logEdit);
}