HBASE-2935 ... missing file

git-svn-id: https://svn.apache.org/repos/asf/hbase/trunk@1031423 13f79535-47bb-0310-9956-ffa450edef68

src/test/java/org/apache/hadoop/hbase/regionserver/wal/FaultySequenceFileLogReader.java

@@ -0,0 +1,79 @@
+/**
+ * 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 java.io.IOException;
+import java.util.LinkedList;
+import java.util.Queue;
+
+import org.apache.hadoop.hbase.regionserver.wal.HLog.Entry;
+
+public class FaultySequenceFileLogReader extends SequenceFileLogReader {
+
+  enum FailureType {
+    BEGINNING, MIDDLE, END, NONE
+  }
+
+  Queue<Entry> nextQueue = new LinkedList<Entry>();
+  int numberOfFileEntries = 0;
+
+  FailureType getFailureType() {
+    return FailureType.valueOf(conf.get("faultysequencefilelogreader.failuretype", "NONE"));
+  }
+
+  @Override
+  public HLog.Entry next(HLog.Entry reuse) throws IOException {
+    this.entryStart = this.reader.getPosition();
+    boolean b = true;
+
+    if (nextQueue.isEmpty()) { // Read the whole thing at once and fake reading
+      while (b == true) {
+        HLogKey key = HLog.newKey(conf);
+        WALEdit val = new WALEdit();
+        HLog.Entry e = new HLog.Entry(key, val);
+        b = this.reader.next(e.getKey(), e.getEdit());
+        nextQueue.offer(e);
+        numberOfFileEntries++;
+      }
+    }
+
+    if (nextQueue.size() == this.numberOfFileEntries
+        && getFailureType() == FailureType.BEGINNING) {
+      throw this.addFileInfoToException(new IOException("fake Exception"));
+    } else if (nextQueue.size() == this.numberOfFileEntries / 2
+        && getFailureType() == FailureType.MIDDLE) {
+      throw this.addFileInfoToException(new IOException("fake Exception"));
+    } else if (nextQueue.size() == 1 && getFailureType() == FailureType.END) {
+      throw this.addFileInfoToException(new IOException("fake Exception"));
+    }
+
+    if (nextQueue.peek() != null) {
+      edit++;
+    }
+
+    Entry e = nextQueue.poll();
+
+    if (e.getEdit().isEmpty()) {
+      return null;
+    }
+    return e;
+  }
+}