/**
 * 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.streaming;

import java.io.IOException;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import org.apache.cassandra.db.Table;
import org.apache.cassandra.io.sstable.Descriptor;
import org.apache.cassandra.io.sstable.AESRecoveryProcessor;
import org.apache.cassandra.io.sstable.IRecoveryProcessor;
import org.apache.cassandra.io.sstable.IndexRecoveryProcessor;
import org.apache.cassandra.io.sstable.SSTableReader;
import org.apache.cassandra.io.sstable.SSTableWriter;
import org.apache.cassandra.net.MessagingService;

/**
 * This is the callback handler that is invoked on the receiving node when a file changes status from RECEIVE to either
 * FileStatus.STREAM (needs to be restreamed) or FileStatus.DELETE (successfully completed).
*/
class FileStatusHandler
{
    private static Logger logger = LoggerFactory.getLogger(FileStatusHandler.class);

    public static void onStatusChange(StreamContext context, PendingFile pendingFile, FileStatus streamStatus) throws IOException
    {
        if (FileStatus.Action.STREAM == streamStatus.getAction())
        {
            // file needs to be restreamed
            logger.warn("Streaming of file {} from {} failed: requesting a retry.", pendingFile, context);
            MessagingService.instance.sendOneWay(streamStatus.makeStreamStatusMessage(), context.host);
            return;
        }
        assert FileStatus.Action.DELETE == streamStatus.getAction() :
            "Unknown stream action: " + streamStatus.getAction();

        addSSTable(pendingFile, context);

        // send a StreamStatus message telling the source node it can delete this file
        if (logger.isDebugEnabled())
            logger.debug("Sending a streaming finished message for {} to {}", pendingFile, context);
        MessagingService.instance.sendOneWay(streamStatus.makeStreamStatusMessage(), context.host);
    }

    public static void addSSTable(PendingFile pendingFile, StreamContext context)
    {
        // file was successfully streamed
        Descriptor desc = pendingFile.desc;
        try
        {
            // right now we only need to do this differently for AES operations
            IRecoveryProcessor rp = pendingFile.type == OperationType.AES ? new AESRecoveryProcessor(context.host) : IndexRecoveryProcessor.instance();
            SSTableReader sstable = SSTableWriter.recoverAndOpen(pendingFile.desc, rp);
            Table.open(desc.ksname).getColumnFamilyStore(desc.cfname).addSSTable(sstable);
            logger.info("Streaming added " + sstable);
        }
        catch (IOException e)
        {
            logger.error("Failed adding {}", pendingFile, e);
            throw new RuntimeException("Not able to add streamed file " + pendingFile.getFilename(), e);
        }
    }
}