diff --git hbase-server/src/main/java/org/apache/hadoop/hbase/coprocessor/BaseWALObserver.java hbase-server/src/main/java/org/apache/hadoop/hbase/coprocessor/BaseWALObserver.java new file mode 100644 index 0000000..bf3c5a5 --- /dev/null +++ hbase-server/src/main/java/org/apache/hadoop/hbase/coprocessor/BaseWALObserver.java @@ -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 ctx, HRegionInfo info, + HLogKey logKey, WALEdit logEdit) throws IOException { + return false; + } + + @Override + public void postWALWrite(ObserverContext ctx, HRegionInfo info, + HLogKey logKey, WALEdit logEdit) throws IOException { } +} diff --git hbase-server/src/main/java/org/apache/hadoop/hbase/coprocessor/WALObserver.java hbase-server/src/main/java/org/apache/hadoop/hbase/coprocessor/WALObserver.java index 55377ce..10b7d47 100644 --- hbase-server/src/main/java/org/apache/hadoop/hbase/coprocessor/WALObserver.java +++ hbase-server/src/main/java/org/apache/hadoop/hbase/coprocessor/WALObserver.java @@ -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 ctx, HRegionInfo info, HLogKey logKey, WALEdit logEdit) throws IOException;