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The Apache Cassandra Project develops a highly scalable second-generation distributed database, bringing together Dynamo's fully distributed design and Bigtable's ColumnFamily-based data model.

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/*
 * 
 * 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.
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 */
package org.apache.cassandra.service.paxos;

import java.util.concurrent.CountDownLatch;

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

import org.apache.cassandra.config.DatabaseDescriptor;
import org.apache.cassandra.db.ConsistencyLevel;
import org.apache.cassandra.db.WriteType;
import org.apache.cassandra.exceptions.RequestFailureReason;
import org.apache.cassandra.exceptions.WriteTimeoutException;
import org.apache.cassandra.locator.InetAddressAndPort;
import org.apache.cassandra.net.RequestCallback;

import static java.util.concurrent.TimeUnit.NANOSECONDS;

public abstract class AbstractPaxosCallback implements RequestCallback
{
    private static final Logger logger = LoggerFactory.getLogger(AbstractPaxosCallback.class);
    protected final CountDownLatch latch;
    protected final int targets;
    private final ConsistencyLevel consistency;
    private final long queryStartNanoTime;

    public AbstractPaxosCallback(int targets, ConsistencyLevel consistency, long queryStartNanoTime)
    {
        this.targets = targets;
        this.consistency = consistency;
        latch = new CountDownLatch(targets);
        this.queryStartNanoTime = queryStartNanoTime;
    }

    public int getResponseCount()
    {
        return (int) (targets - latch.getCount());
    }

    public void await() throws WriteTimeoutException
    {
        try
        {
            long timeout = DatabaseDescriptor.getWriteRpcTimeout(NANOSECONDS) - (System.nanoTime() - queryStartNanoTime);
            if (!latch.await(timeout, NANOSECONDS))
                throw new WriteTimeoutException(WriteType.CAS, consistency, getResponseCount(), targets);
        }
        catch (InterruptedException ex)
        {
            throw new AssertionError("This latch shouldn't have been interrupted.");
        }
    }

    @Override
    public void onFailure(InetAddressAndPort from, RequestFailureReason failureReason)
    {
        logger.debug("Received paxos propose/prepare failure response from {} reason {}", from, failureReason);
    }

    @Override
    public boolean invokeOnFailure()
    {
        return true;
    }
}