package org.apache.cassandra.service;
/*
*
* 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.
*
*/
import java.io.DataInputStream;
import java.io.IOError;
import java.io.IOException;
import java.nio.ByteBuffer;
import java.util.concurrent.ConcurrentMap;
import org.apache.commons.lang.ArrayUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.apache.cassandra.db.DecoratedKey;
import org.apache.cassandra.db.ReadResponse;
import org.apache.cassandra.db.Row;
import org.apache.cassandra.io.util.FastByteArrayInputStream;
import org.apache.cassandra.net.Message;
import org.apache.cassandra.utils.FBUtilities;
import org.cliffc.high_scale_lib.NonBlockingHashMap;
public abstract class AbstractRowResolver implements IResponseResolver<Row>
{
protected static Logger logger = LoggerFactory.getLogger(AbstractRowResolver.class);
private static final Message FAKE_MESSAGE = new Message(FBUtilities.getBroadcastAddress(), StorageService.Verb.INTERNAL_RESPONSE, ArrayUtils.EMPTY_BYTE_ARRAY, -1);
protected final String table;
protected final ConcurrentMap<Message, ReadResponse> replies = new NonBlockingHashMap<Message, ReadResponse>();
protected final DecoratedKey<?> key;
public AbstractRowResolver(ByteBuffer key, String table)
{
this.key = StorageService.getPartitioner().decorateKey(key);
this.table = table;
}
public void preprocess(Message message)
{
byte[] body = message.getMessageBody();
FastByteArrayInputStream bufIn = new FastByteArrayInputStream(body);
try
{
ReadResponse result = ReadResponse.serializer().deserialize(new DataInputStream(bufIn), message.getVersion());
if (logger.isDebugEnabled())
logger.debug("Preprocessed {} response", result.isDigestQuery() ? "digest" : "data");
replies.put(message, result);
}
catch (IOException e)
{
throw new IOError(e);
}
}
/** hack so local reads don't force de/serialization of an extra real Message */
public void injectPreProcessed(ReadResponse result)
{
assert replies.get(FAKE_MESSAGE) == null; // should only be one local reply
replies.put(FAKE_MESSAGE, result);
}
public Iterable<Message> getMessages()
{
return replies.keySet();
}
public int getMaxLiveColumns()
{
throw new UnsupportedOperationException();
}
}