WriteResponse.java

/**
 * 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 com.facebook.infrastructure.db;

import java.io.ByteArrayOutputStream;
import java.io.DataInputStream;
import java.io.DataOutputStream;
import java.io.IOException;
import java.io.Serializable;

import com.facebook.infrastructure.io.ICompactSerializer;
import com.facebook.infrastructure.net.Message;
import com.facebook.infrastructure.net.MessagingService;
import com.facebook.infrastructure.service.StorageService;

/*
 * This message is sent back the row mutation verb handler 
 * and basically specifes if the write succeeded or not for a particular 
 * key in a table
 * Author : Avinash Lakshman ( alakshman@facebook.com) & Prashant Malik ( pmalik@facebook.com )
 */
public class WriteResponse implements Serializable
{
private static WriteResponseSerializer serializer_ = new WriteResponseSerializer();

    public static WriteResponseSerializer serializer()
    {
        return serializer_;
    }
	
    public static Message makeWriteResponseMessage(Message original, WriteResponse writeResponseMessage) throws IOException
    {
    	ByteArrayOutputStream bos = new ByteArrayOutputStream();
        DataOutputStream dos = new DataOutputStream( bos );
        WriteResponse.serializer().serialize(writeResponseMessage, dos);
        return original.getReply(StorageService.getLocalStorageEndPoint(), bos.toByteArray());
    }

	private final String table_;
	private final String key_;
	private final boolean status_;
	
	public WriteResponse(String table, String key, boolean bVal) {
		table_ = table;
		key_ = key;
		status_ = bVal;
	}

	public String table() 
	{
		return table_;
	}

	public String key() 
	{
		return key_;
	}
	
	public boolean isSuccess()
	{
		return status_;
	}

    public static class WriteResponseSerializer implements ICompactSerializer<WriteResponse>
    {
        public void serialize(WriteResponse wm, DataOutputStream dos) throws IOException
        {
            dos.writeUTF(wm.table());
            dos.writeUTF(wm.key());
            dos.writeBoolean(wm.isSuccess());
        }

        public WriteResponse deserialize(DataInputStream dis) throws IOException
        {
            String table = dis.readUTF();
            String key = dis.readUTF();
            boolean status = dis.readBoolean();
            return new WriteResponse(table, key, status);
        }
    }
}