/**
* 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.service;
import java.util.List;
import org.apache.cassandra.db.WriteResponse;
import org.apache.cassandra.net.Message;
import org.apache.log4j.Logger;
/**
* Author : Avinash Lakshman ( alakshman@facebook.com) & Prashant Malik ( pmalik@facebook.com )
*/
public class WriteResponseResolver implements IResponseResolver<Boolean> {
private static Logger logger_ = Logger.getLogger(WriteResponseResolver.class);
/*
* The resolve function for the Write looks at all the responses if all the
* respones returned are false then we have a problem since that means the
* key wa not written to any of the servers we want to notify the client of
* this so in that case we should return a false saying that the write
* failed.
*
*/
public Boolean resolve(List<Message> responses) throws DigestMismatchException
{
// TODO: We need to log error responses here for example
// if a write fails for a key log that the key could not be replicated
boolean returnValue = false;
for (Message response : responses) {
Object[] body = response.getMessageBody();
WriteResponse writeResponse = (WriteResponse) body[0];
boolean result = writeResponse.isSuccess();
if (!result) {
logger_.debug("Write at " + response.getFrom()
+ " may have failed for the key " + writeResponse.key());
}
returnValue |= result;
}
return returnValue;
}
public boolean isDataPresent(List<Message> responses)
{
return true;
}
}