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HBASE-11473 Add BaseWALObserver class

This commit is contained in:
Enis Soztutar 2014-07-07 17:23:40 -07:00
parent d07bc87cd6
commit 36d84a1515
2 changed files with 55 additions and 0 deletions
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54
hbase-server/src/main/java/org/apache/hadoop/hbase/coprocessor/BaseWALObserver.java Normal file
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@ -0,0 +1,54 @@
/**
* 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.coprocessor;
import java.io.IOException;
import org.apache.hadoop.classification.InterfaceAudience;
import org.apache.hadoop.classification.InterfaceStability;
import org.apache.hadoop.hbase.CoprocessorEnvironment;
import org.apache.hadoop.hbase.HBaseInterfaceAudience;
import org.apache.hadoop.hbase.HRegionInfo;
import org.apache.hadoop.hbase.regionserver.wal.HLogKey;
import org.apache.hadoop.hbase.regionserver.wal.WALEdit;
/**
* An abstract class that implements WALObserver.
* By extending it, you can create your own WAL observer without
* overriding all abstract methods of WALObserver.
*/
@InterfaceAudience.LimitedPrivate(HBaseInterfaceAudience.COPROC)
@InterfaceStability.Evolving
public class BaseWALObserver implements WALObserver {
@Override
public void start(CoprocessorEnvironment e) throws IOException { }
@Override
public void stop(CoprocessorEnvironment e) throws IOException { }
@Override
public boolean preWALWrite(ObserverContext<WALCoprocessorEnvironment> ctx, HRegionInfo info,
HLogKey logKey, WALEdit logEdit) throws IOException {
return false;
}
@Override
public void postWALWrite(ObserverContext<WALCoprocessorEnvironment> ctx, HRegionInfo info,
HLogKey logKey, WALEdit logEdit) throws IOException { }
}

1
hbase-server/src/main/java/org/apache/hadoop/hbase/coprocessor/WALObserver.java
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@ -54,6 +54,7 @@ public interface WALObserver extends Coprocessor {
* @return true if default behavior should be bypassed, false otherwise
* @throws IOException
*/
// TODO: return value is not used
boolean preWALWrite(ObserverContext<WALCoprocessorEnvironment> ctx,
HRegionInfo info, HLogKey logKey, WALEdit logEdit) throws IOException;