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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.
*/
package org.apache.cassandra.locator;
import java.lang.reflect.Constructor;
import java.net.InetAddress;
import java.util.*;
import com.google.common.collect.HashMultimap;
import com.google.common.collect.Multimap;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.apache.cassandra.config.ConfigurationException;
import org.apache.cassandra.dht.Range;
import org.apache.cassandra.dht.RingPosition;
import org.apache.cassandra.dht.Token;
import org.apache.cassandra.service.DatacenterSyncWriteResponseHandler;
import org.apache.cassandra.service.DatacenterWriteResponseHandler;
import org.apache.cassandra.service.IWriteResponseHandler;
import org.apache.cassandra.service.WriteResponseHandler;
import org.apache.cassandra.thrift.ConsistencyLevel;
import org.apache.cassandra.utils.FBUtilities;
import org.cliffc.high_scale_lib.NonBlockingHashMap;
/**
* A abstract parent for all replication strategies.
*/
public abstract class AbstractReplicationStrategy
{
private static final Logger logger = LoggerFactory.getLogger(AbstractReplicationStrategy.class);
public final String table;
public final Map<String, String> configOptions;
private final TokenMetadata tokenMetadata;
public IEndpointSnitch snitch;
AbstractReplicationStrategy(String table, TokenMetadata tokenMetadata, IEndpointSnitch snitch, Map<String, String> configOptions)
{
assert table != null;
assert snitch != null;
assert tokenMetadata != null;
this.tokenMetadata = tokenMetadata;
this.snitch = snitch;
this.tokenMetadata.register(this);
this.configOptions = configOptions;
this.table = table;
}
private final Map<Token, ArrayList<InetAddress>> cachedEndpoints = new NonBlockingHashMap<Token, ArrayList<InetAddress>>();
public ArrayList<InetAddress> getCachedEndpoints(Token t)
{
return cachedEndpoints.get(t);
}
public void cacheEndpoint(Token t, ArrayList<InetAddress> addr)
{
cachedEndpoints.put(t, addr);
}
public void clearEndpointCache()
{
logger.debug("clearing cached endpoints");
cachedEndpoints.clear();
}
/**
* get the (possibly cached) endpoints that should store the given Token.
* Note that while the endpoints are conceptually a Set (no duplicates will be included),
* we return a List to avoid an extra allocation when sorting by proximity later
* @param searchPosition the position the natural endpoints are requested for
* @return a copy of the natural endpoints for the given token
*/
public ArrayList<InetAddress> getNaturalEndpoints(RingPosition searchPosition)
{
Token searchToken = searchPosition.getToken();
Token keyToken = TokenMetadata.firstToken(tokenMetadata.sortedTokens(), searchToken);
ArrayList<InetAddress> endpoints = getCachedEndpoints(keyToken);
if (endpoints == null)
{
TokenMetadata tokenMetadataClone = tokenMetadata.cloneOnlyTokenMap();
keyToken = TokenMetadata.firstToken(tokenMetadataClone.sortedTokens(), searchToken);
endpoints = new ArrayList<InetAddress>(calculateNaturalEndpoints(searchToken, tokenMetadataClone));
cacheEndpoint(keyToken, endpoints);
}
return new ArrayList<InetAddress>(endpoints);
}
/**
* calculate the natural endpoints for the given token
*
* @see #getNaturalEndpoints(org.apache.cassandra.dht.RingPosition)
*
* @param searchToken the token the natural endpoints are requested for
* @return a copy of the natural endpoints for the given token
*/
public abstract List<InetAddress> calculateNaturalEndpoints(Token searchToken, TokenMetadata tokenMetadata);
public IWriteResponseHandler getWriteResponseHandler(Collection<InetAddress> writeEndpoints, ConsistencyLevel consistency_level)
{
if (consistency_level == ConsistencyLevel.LOCAL_QUORUM)
{
// block for in this context will be localnodes block.
return DatacenterWriteResponseHandler.create(writeEndpoints, consistency_level, table);
}
else if (consistency_level == ConsistencyLevel.EACH_QUORUM)
{
return DatacenterSyncWriteResponseHandler.create(writeEndpoints, consistency_level, table);
}
return WriteResponseHandler.create(writeEndpoints, consistency_level, table);
}
/**
* calculate the RF based on strategy_options. When overwriting, ensure that this get()
* is FAST, as this is called often.
*
* @return the replication factor
*/
public abstract int getReplicationFactor();
/*
* NOTE: this is pretty inefficient. also the inverse (getRangeAddresses) below.
* this is fine as long as we don't use this on any critical path.
* (fixing this would probably require merging tokenmetadata into replicationstrategy,
* so we could cache/invalidate cleanly.)
*/
public Multimap<InetAddress, Range<Token>> getAddressRanges(TokenMetadata metadata)
{
Multimap<InetAddress, Range<Token>> map = HashMultimap.create();
for (Token token : metadata.sortedTokens())
{
Range<Token> range = metadata.getPrimaryRangeFor(token);
for (InetAddress ep : calculateNaturalEndpoints(token, metadata))
{
map.put(ep, range);
}
}
return map;
}
public Multimap<Range<Token>, InetAddress> getRangeAddresses(TokenMetadata metadata)
{
Multimap<Range<Token>, InetAddress> map = HashMultimap.create();
for (Token token : metadata.sortedTokens())
{
Range<Token> range = metadata.getPrimaryRangeFor(token);
for (InetAddress ep : calculateNaturalEndpoints(token, metadata))
{
map.put(range, ep);
}
}
return map;
}
public Multimap<InetAddress, Range<Token>> getAddressRanges()
{
return getAddressRanges(tokenMetadata);
}
public Collection<Range<Token>> getPendingAddressRanges(TokenMetadata metadata, Token pendingToken, InetAddress pendingAddress)
{
TokenMetadata temp = metadata.cloneOnlyTokenMap();
temp.updateNormalToken(pendingToken, pendingAddress);
return getAddressRanges(temp).get(pendingAddress);
}
public void invalidateCachedTokenEndpointValues()
{
clearEndpointCache();
}
public abstract void validateOptions() throws ConfigurationException;
public static AbstractReplicationStrategy createReplicationStrategy(String table,
Class<? extends AbstractReplicationStrategy> strategyClass,
TokenMetadata tokenMetadata,
IEndpointSnitch snitch,
Map<String, String> strategyOptions)
throws ConfigurationException
{
AbstractReplicationStrategy strategy;
Class [] parameterTypes = new Class[] {String.class, TokenMetadata.class, IEndpointSnitch.class, Map.class};
try
{
Constructor<? extends AbstractReplicationStrategy> constructor = strategyClass.getConstructor(parameterTypes);
strategy = constructor.newInstance(table, tokenMetadata, snitch, strategyOptions);
}
catch (Exception e)
{
throw new RuntimeException(e);
}
// Throws Config Exception if strat_opts don't contain required info
strategy.validateOptions();
return strategy;
}
public static AbstractReplicationStrategy createReplicationStrategy(String table,
String strategyClassName,
TokenMetadata tokenMetadata,
IEndpointSnitch snitch,
Map<String, String> strategyOptions)
throws ConfigurationException
{
Class<AbstractReplicationStrategy> c = getClass(strategyClassName);
return createReplicationStrategy(table, c, tokenMetadata, snitch, strategyOptions);
}
public static Class<AbstractReplicationStrategy> getClass(String cls) throws ConfigurationException
{
String className = cls.contains(".") ? cls : "org.apache.cassandra.locator." + cls;
return FBUtilities.classForName(className, "replication strategy");
}
protected void validateReplicationFactor(String rf) throws ConfigurationException
{
try
{
if (Integer.parseInt(rf) < 0)
{
throw new ConfigurationException("Replication factor must be non-negative; found " + rf);
}
}
catch (NumberFormatException e2)
{
throw new ConfigurationException("Replication factor must be numeric; found " + rf);
}
}
protected void warnOnUnexpectedOptions(Collection<String> expectedOptions)
{
for (String key : configOptions.keySet())
{
if (!expectedOptions.contains(key))
logger.warn("Unrecognized strategy option {" + key + "} passed to " + getClass().getSimpleName() + " for keyspace " + table);
}
}
}