org.apache.cassandra.schema.ReplicationParams Maven / Gradle / Ivy
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* 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
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*/
package org.apache.cassandra.schema;
import java.util.HashMap;
import java.util.Map;
import com.google.common.base.MoreObjects;
import com.google.common.base.Objects;
import com.google.common.collect.ImmutableMap;
import org.apache.cassandra.config.DatabaseDescriptor;
import org.apache.cassandra.locator.*;
import org.apache.cassandra.service.StorageService;
public final class ReplicationParams
{
public static final String CLASS = "class";
public final Class klass;
public final ImmutableMap options;
private ReplicationParams(Class klass, Map options)
{
this.klass = klass;
this.options = ImmutableMap.copyOf(options);
}
static ReplicationParams local()
{
return new ReplicationParams(LocalStrategy.class, ImmutableMap.of());
}
static ReplicationParams simple(int replicationFactor)
{
return new ReplicationParams(SimpleStrategy.class, ImmutableMap.of("replication_factor", Integer.toString(replicationFactor)));
}
static ReplicationParams nts(Object... args)
{
assert args.length % 2 == 0;
Map options = new HashMap<>();
for (int i = 0; i < args.length; i += 2)
{
String dc = (String) args[i];
Integer rf = (Integer) args[i + 1];
options.put(dc, rf.toString());
}
return new ReplicationParams(NetworkTopologyStrategy.class, options);
}
public void validate(String name)
{
// Attempt to instantiate the ARS, which will throw a ConfigurationException if the options aren't valid.
TokenMetadata tmd = StorageService.instance.getTokenMetadata();
IEndpointSnitch eps = DatabaseDescriptor.getEndpointSnitch();
AbstractReplicationStrategy.validateReplicationStrategy(name, klass, tmd, eps, options);
}
public static ReplicationParams fromMap(Map map)
{
Map options = new HashMap<>(map);
String className = options.remove(CLASS);
Class klass = AbstractReplicationStrategy.getClass(className);
return new ReplicationParams(klass, options);
}
public Map asMap()
{
Map map = new HashMap<>(options);
map.put(CLASS, klass.getName());
return map;
}
@Override
public boolean equals(Object o)
{
if (this == o)
return true;
if (!(o instanceof ReplicationParams))
return false;
ReplicationParams r = (ReplicationParams) o;
return klass.equals(r.klass) && options.equals(r.options);
}
@Override
public int hashCode()
{
return Objects.hashCode(klass, options);
}
@Override
public String toString()
{
MoreObjects.ToStringHelper helper = MoreObjects.toStringHelper(this);
helper.add(CLASS, klass.getName());
for (Map.Entry entry : options.entrySet())
helper.add(entry.getKey(), entry.getValue());
return helper.toString();
}
}