--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/java/org/apache/cassandra/db/ReadResponse.java	Fri Apr 02 13:36:02 2010 +0900
@@ -0,0 +1,121 @@
+/**
+ * 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.cassandra.db;
+
+import java.io.ByteArrayOutputStream;
+import java.io.DataInputStream;
+import java.io.DataOutputStream;
+import java.io.IOException;
+
+import org.apache.cassandra.concurrent.StageManager;
+import org.apache.cassandra.io.ICompactSerializer;
+import org.apache.cassandra.net.Message;
+import org.apache.cassandra.net.MessagingService;
+import org.apache.cassandra.utils.FBUtilities;
+
+import org.apache.commons.lang.ArrayUtils;
+
+
+/*
+ * The read response message is sent by the server when reading data 
+ * this encapsulates the tablename and the row that has been read.
+ * The table name is needed so that we can use it to create repairs.
+ */
+public class ReadResponse
+{
+private static ICompactSerializer<ReadResponse> serializer_;
+
+    static
+    {
+        serializer_ = new ReadResponseSerializer();
+    }
+
+    public static ICompactSerializer<ReadResponse> serializer()
+    {
+        return serializer_;
+    }
+    
+	private Row row_;
+	private byte[] digest_ = ArrayUtils.EMPTY_BYTE_ARRAY;
+    private boolean isDigestQuery_ = false;
+
+	public ReadResponse(byte[] digest )
+    {
+        assert digest != null;
+		digest_= digest;
+	}
+
+	public ReadResponse(Row row)
+    {
+		row_ = row;
+	}
+
+	public Row row() 
+    {
+		return row_;
+    }
+        
+	public byte[] digest() 
+    {
+		return digest_;
+	}
+
+	public boolean isDigestQuery()
+    {
+    	return isDigestQuery_;
+    }
+    
+    public void setIsDigestQuery(boolean isDigestQuery)
+    {
+    	isDigestQuery_ = isDigestQuery;
+    }
+}
+
+class ReadResponseSerializer implements ICompactSerializer<ReadResponse>
+{
+	public void serialize(ReadResponse rm, DataOutputStream dos) throws IOException
+	{
+        dos.writeInt(rm.digest().length);
+        dos.write(rm.digest());
+        dos.writeBoolean(rm.isDigestQuery());
+        
+        if( !rm.isDigestQuery() && rm.row() != null )
+        {            
+            Row.serializer().serialize(rm.row(), dos);
+        }				
+	}
+	
+    public ReadResponse deserialize(DataInputStream dis) throws IOException
+    {
+        int digestSize = dis.readInt();
+        byte[] digest = new byte[digestSize];
+        dis.read(digest, 0 , digestSize);
+        boolean isDigest = dis.readBoolean();
+        
+        Row row = null;
+        if (!isDigest)
+        {
+            row = Row.serializer().deserialize(dis);
+        }
+
+        ReadResponse rmsg = isDigest ? new ReadResponse(digest) : new ReadResponse(row);
+        rmsg.setIsDigestQuery(isDigest);
+    	return rmsg;
+    } 
+}