package org.apache.cassandra.stress.settings;
import java.util.ArrayList;
import java.util.List;
import org.apache.cassandra.stress.generatedata.Distribution;
import org.apache.cassandra.stress.generatedata.DistributionFactory;
import org.apache.commons.math3.distribution.EnumeratedDistribution;
import org.apache.commons.math3.util.Pair;
// Settings unique to the mixed command type
public class SettingsCommandMixed extends SettingsCommandMulti
{
// Ratios for selecting commands - index for each Command, NaN indicates the command is not requested
private final List<Pair<Command, Double>> ratios;
private final DistributionFactory clustering;
public SettingsCommandMixed(Options options)
{
super(Command.MIXED, options.parent);
OptionSimple[] ratiosIn = options.probabilities.ratios;
List<Pair<Command, Double>> ratiosOut = new ArrayList<>();
for (int i = 0 ; i < ratiosIn.length ; i++)
{
if (ratiosIn[i] != null && ratiosIn[i].present())
{
double d = Double.parseDouble(ratiosIn[i].value());
if (d > 0)
ratiosOut.add(new Pair<>(Command.values()[i], d));
}
}
ratios = ratiosOut;
clustering = options.clustering.get();
if (ratios.size() == 0)
throw new IllegalArgumentException("Must specify at least one command with a non-zero ratio");
}
public List<Command> getCommands()
{
final List<Command> r = new ArrayList<>();
for (Pair<Command, Double> p : ratios)
r.add(p.getFirst());
return r;
}
public CommandSelector selector()
{
return new CommandSelector(ratios, clustering.get());
}
// Class for randomly selecting the next command type
public static final class CommandSelector
{
final EnumeratedDistribution<Command> selector;
final Distribution count;
private Command cur;
private long remaining;
public CommandSelector(List<Pair<Command, Double>> ratios, Distribution count)
{
selector = new EnumeratedDistribution<>(ratios);
this.count = count;
}
public Command next()
{
while (remaining == 0)
{
remaining = count.next();
cur = selector.sample();
}
remaining--;
return cur;
}
}
// Option Declarations
static final class Probabilities extends OptionMulti
{
// entry for each in Command.values()
final OptionSimple[] ratios;
final List<OptionSimple> grouping;
public Probabilities()
{
super("ratio", "Specify the ratios for operations to perform; e.g. (reads=2,writes=1) will perform 2 reads for each write");
OptionSimple[] ratios = new OptionSimple[Command.values().length];
List<OptionSimple> grouping = new ArrayList<>();
for (Command command : Command.values())
{
if (command.category == null)
continue;
String defaultValue;
switch (command)
{
case MIXED:
continue;
case READ:
case WRITE:
defaultValue = "1";
break;
default:
defaultValue = null;
}
OptionSimple ratio = new OptionSimple(command.toString().toLowerCase() +
"=", "[0-9]+(\\.[0-9]+)?", defaultValue, "Performs this many " + command + " operations out of total", false);
ratios[command.ordinal()] = ratio;
grouping.add(ratio);
}
this.grouping = grouping;
this.ratios = ratios;
}
@Override
public List<? extends Option> options()
{
return grouping;
}
}
static final class Options extends GroupedOptions
{
final SettingsCommandMulti.Options parent;
protected Options(SettingsCommandMulti.Options parent)
{
this.parent = parent;
}
final OptionDistribution clustering = new OptionDistribution("clustering=", "GAUSSIAN(1..10)");
final Probabilities probabilities = new Probabilities();
@Override
public List<? extends Option> options()
{
final List<Option> options = new ArrayList<>();
options.add(clustering);
options.add(probabilities);
options.addAll(parent.options());
return options;
}
}
// CLI utility methods
public static SettingsCommandMixed build(String[] params)
{
GroupedOptions options = GroupedOptions.select(params,
new Options(new SettingsCommandMulti.Options(new Uncertainty())),
new Options(new SettingsCommandMulti.Options(new Count())));
if (options == null)
{
printHelp();
System.out.println("Invalid MIXED options provided, see output for valid options");
System.exit(1);
}
return new SettingsCommandMixed((Options) options);
}
public static void printHelp()
{
GroupedOptions.printOptions(System.out, "mixed",
new Options(new SettingsCommandMulti.Options(new Uncertainty())),
new Options(new SettingsCommandMulti.Options(new Count())));
}
public static Runnable helpPrinter()
{
return new Runnable()
{
@Override
public void run()
{
printHelp();
}
};
}
}