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From e...@apache.org
Subject git commit: HBASE-11473 Add BaseWALObserver class
Date Tue, 08 Jul 2014 00:26:21 GMT
Repository: hbase
Updated Branches:
  refs/heads/branch-1 cc4f54770 -> fef10e841


HBASE-11473 Add BaseWALObserver class


Project: http://git-wip-us.apache.org/repos/asf/hbase/repo
Commit: http://git-wip-us.apache.org/repos/asf/hbase/commit/fef10e84
Tree: http://git-wip-us.apache.org/repos/asf/hbase/tree/fef10e84
Diff: http://git-wip-us.apache.org/repos/asf/hbase/diff/fef10e84

Branch: refs/heads/branch-1
Commit: fef10e8413fa92d3d7a778197099d5657a81739c
Parents: cc4f547
Author: Enis Soztutar <enis@apache.org>
Authored: Mon Jul 7 17:23:40 2014 -0700
Committer: Enis Soztutar <enis@apache.org>
Committed: Mon Jul 7 17:24:29 2014 -0700

----------------------------------------------------------------------
 .../hbase/coprocessor/BaseWALObserver.java      | 54 ++++++++++++++++++++
 .../hadoop/hbase/coprocessor/WALObserver.java   |  1 +
 2 files changed, 55 insertions(+)
----------------------------------------------------------------------


http://git-wip-us.apache.org/repos/asf/hbase/blob/fef10e84/hbase-server/src/main/java/org/apache/hadoop/hbase/coprocessor/BaseWALObserver.java
----------------------------------------------------------------------
diff --git a/hbase-server/src/main/java/org/apache/hadoop/hbase/coprocessor/BaseWALObserver.java
b/hbase-server/src/main/java/org/apache/hadoop/hbase/coprocessor/BaseWALObserver.java
new file mode 100644
index 0000000..bf3c5a5
--- /dev/null
+++ b/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<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 { }
+}

http://git-wip-us.apache.org/repos/asf/hbase/blob/fef10e84/hbase-server/src/main/java/org/apache/hadoop/hbase/coprocessor/WALObserver.java
----------------------------------------------------------------------
diff --git a/hbase-server/src/main/java/org/apache/hadoop/hbase/coprocessor/WALObserver.java
b/hbase-server/src/main/java/org/apache/hadoop/hbase/coprocessor/WALObserver.java
index 55377ce..10b7d47 100644
--- a/hbase-server/src/main/java/org/apache/hadoop/hbase/coprocessor/WALObserver.java
+++ b/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<WALCoprocessorEnvironment> ctx,
       HRegionInfo info, HLogKey logKey, WALEdit logEdit) throws IOException;
 


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